Atomically thin two-dimensional nanomaterials such as graphene and transition metal dichalcogenides (TMDCs) have seen a rapid growth of exploration since the isolation of monolayer graphene. These materials provide a rich field of study for physics and optoelectronics applications. Many applications seek to combine a two dimensional (2D) material with another nanomaterial, either another two dimensional material or a zero (0D) or one dimensional (1D) material. The work in this thesis explores the consequences of these interactions from 0D to 2D. We begin in Chapter 2 with a study of energy transfer at 0D-2D interfaces with quantum dots and graphene. In our work we seek to maximize the rate of energy transfer by reducing the distance between the materials. We observe an interplay with the distance-dependence and surface effects from our halogen terminated quantum dots that affect our observed energy transfer. In Chapter 3 we study supercapacitance in composite graphene oxide- carbon nanotube electrodes. At this 2D-1D interface we observe a compounding effect between graphene oxide and carbon nanotubes. Carbon nanotubes increase the accessible surface area of the supercapacitors and improve conductivity by forming a conductive pathway through electrodes. In Chapter 4 we investigate effective means of improving sample quality in TMDCs and discover the importance of the monolayer interface. We observe a drastic improvement in photoluminescence when encapsulating our TMDCs with Boron Nitride. We measure spectral linewidths approaching the intrinsic limit due to this 2D-2D interface. We also effectively reduce excess charge and thus the trion-exciton ratio in our samples through substrate surface passivation. In Chapter 5 we briefly discuss our investigations on chemical doping, heterostructures and interlayer decoupling in ReS₂. We observe an increase in intensity for p-doped MoS₂ samples. We investigated the charge transfer exciton previously identified in heterostructures. Spectral observation of this interlayer exciton remained elusive in our work but provided the motivation for our work in Chapter 4. We also discuss our preliminary results on interlayer decoupling in ReS₂.

This thesis introduces functional nanomaterials including superatoms and carbon nanotubes (CNTs) for new layered solids and molecular devices. Chapters 1-3 present how we incorporate superatoms into two-dimensional (2D) materials. Chapter 1 describes a new and simple approach to dope transition metal dichalcogenides (TMDCs) using the superatom Co6Se8(PEt3)6 as the electron dopant. Doping is an effective method to modulate the electrical properties of materials, and we demonstrate an electron-rich cluster can be used as a tunable and controllable surface dopant for semiconducting TMDCs via charge transfer. As a demonstration of the concept, we make a p-n junction by patterning on specific areas of TMDC films. Chapter 2 and Chapter 3 introduce new 2D materials by molecular design of superatoms. Traditional atomic van der Waals materials such as graphene, hexagonal boron-nitride, and TMDCs have received widespread attention due to the wealth of unusual physical and chemical behaviors that arise when charges, spins, and vibrations are confined to a plane. Though not as widespread as their atomic counterparts, molecule-based layered solids offer significant benefits; their structural flexibility will enable the development of materials with tunable properties. Chapter 2 describes a layered van der Waals solid self-assembled from a structure-directing building block and C60 fullerene. The resulting crystalline solid contains a corrugated monolayer of neutral fullerenes and can be mechanically exfoliated. Chapter 3 describes a new method to functionalize electroactive superatoms with groups that can direct their assembly into covalent and non-covalent multi-dimensional frameworks. We synthesized Co6Se8[PEt2(4-C6H4COOH)]6 and found that it forms two types of crystalline assemblies with Zn(NO3)2, one is a three-dimensional solid and the other consists of stacked layers of two-dimensional sheets. The dimensionality is controlled by subtle changes in reaction conditions. CNT-based field-effect transistor (FETs), in which a single molecule spans an oxidatively cut gap in the CNT, provide a versatile, ground-state platform with well-defined electrical contacts. For statistical studies of a variety of small molecule bridges, Chapter 4 presents a novel fabrication method to produce hundreds of FETs on one single carbon nanotube. A large number of devices allows us to study the stability and uniformity of CNT FET properties. Moreover, the new platform also enables a quantitative analysis of molecular devices. In particular, we used CNT FETs for studying DNA-mediated charge transport. DNA conductance was measured by connecting DNA molecules of varying lengths to lithographically cut CNT FETs.

Neste trabalho, foi estudada a decomposição catalítica do metano sobre catalisadores coprecipitados, à base de Co-Al, para produção de hidrogênio e nanotubos de carbono. Foram testados catalisadores com diferentes proporções de cobalto e alumínio, bem como o efeito da adição de outros metais bivalentes (Mg, Ni, Zn ou Cu) ao sistema Co-Al. Os catalisadores foram caracterizados por TGA-DTA, DRX, TPR, TPO e imagens de MEV. As reações foram conduzidas em uma termobalança operando como reator diferencial, com 10 mg de catalisador. A faixa de temperatura analisada foi de 500-750°C. Os melhores resultados em termos de atividade e estabilidade foram obtidos com o catalisador Co66Al33. A adição de outros metais bivalentes não melhorou o desempenho do catalisador, principalmente porque esses metais afetaram a redutibilidade do catalisador. Para o catalisador que apresentou os melhores resultados (Co66Al33), foram realizados testes em diferentes temperaturas e condições reacionais. Os resultados mostraram que a forma de ativação afeta o desempenho deste catalisador, de forma que o catalisador pré-ativado produziu maiores quantidades de hidrogênio, nas reações a 550, 600 e 700°C. No entanto, a 650°C, a amostra autoativada teve desempenho semelhante à pré-ativada, inclusive mostrando-se mais ativa após certo tempo de reação. A caracterização do carbono depositado mostrou que todos os catalisadores produziram nanotubos de carbono. As imagens de microscopia eletrônica por varredura (MEV) mostraram a presença de filamentos mais longos e abundantes na amostra Co50Al50. As análises de oxidação a temperatura programada (TPO) indicaram que os nanotubos de carbono são de parede simples (SWNT). Para o catalisador Co66Al33, as análises de TPO indicaram maior produção de SWNT por parte das amostras pré-ativadas. / In this work, we studied the catalytic decomposition of methane over coprecipitated Co-Al based catalysts, for production of hydrogen and carbon nanotubes. Tests were performed with catalysts containing different Co-Al molar ratios, as well as with addition of other divalent metals (Mg, Ni, Zn, or Cu) to Co-Al system. The samples were characterized by TGA-DTA, XRD, TPR, TPO and SEM images. Activity tests were carried out in a thermobalance, operating as a differential reactor, with 10 mg of catalyst. The temperature range studied was 500-750°C. The best results in terms of activity and stability were obtained with the catalyst Co66Al33. Addition of other divalent metals did not improve the catalyst performance, mainly because these metals affected the catalyst reducibility. For the best results sample (Co66Al33), additional tests were performed at different temperatures and reaction conditions. Results showed that the activation method affects the catalyst performance, so as pre-activated sample produced more hydrogen than auto-activated sample, at 550, 600 and 700°C of reaction temperature. Nevertheless, at 650°C, auto-activated sample had performance almost similar to the pre-activated sample, even showing higher activity after a period of reaction. Characterization of deposited carbon showed that all catalysts produced carbon nanotubes. The images of scanning electron microscopy (SEM) showed formation of longer and abundant filaments in the sample Co50Al50. Temperature programmed oxidation analyses indicated that filaments are single walled carbon nanotubes (SWNT). For the catalyst Co66Al33, TPO analyses indicated a higher production of SWNT by pre-activated samples.

This thesis describes the development and implementation of single-molecule carbon nanotube-based field-effect transistors (smFETs) for studies of nucleic acid dynamics. Single-molecule techniques, most notably fluorescence resonance energy transfer (smFRET) and single-molecule force spectroscopy, have been employed to investigate biomolecular dynamics due to their ability to directly observe discrete, rare events, as well as to characterize structural motions in a diverse ensemble. However, these techniques are hampered by difficulties in measuring millisecond-scale dynamics, such as base pair rearrangements, as well as the inability to observe unperturbed individual molecules for long times. Alternatively, smFETs allow observation of the dynamics of charged biomolecules, such as charged amino acids in proteins or the phosphate groups of nucleic acid backbones, with microsecond temporal resolution. Structural rearrangements of a single charged molecule on the surface of a single-walled carbon nanotube (CNT) transistor can lead to measureable fluctuations in conductance through the CNT. Thus, this technique allows for simultaneous characterization of fast events and, due to the label-free and minimally-invasive nature of smFET technology, the quantification of how the frequency of these events change over long time-scales. A portion of this work describes smFET fabrication, focusing on improvements to the functionalization method, a critical step to reliably generate individual attachment sites on the CNT for subsequent single-molecule studies. A new synthetic chemistry approach is performed in ultraminiaturized, nanofabricated reaction chambers; using lithographically-defined nanowells, single-point attachments are achieved on hundreds of individual carbon nanotube transistors, providing robust statistics and unprecedented spatial control in adduct positioning. Each device acts as a sensor to detect, in real-time and through quantized changes in conductance, single-point functionalization of the nanotube, as well as consecutive chemical reactions and subsequent molecular interactions molecular conformational changes. In particular, this thesis is focused on studying the dynamics of nucleic acids using smFET technology. First, the smFET technique presented is verified by studying the thermodynamics and kinetics of DNA hybridization, the results of which compare favorably both with predicted values and previous smFET studies using alternative device architectures. Next, the reversible folding of a single-stranded telomeric DNA sequence known to form a G-quadruplex structure is studied, revealing the characteristic increased stability of the G-quadruplex structure in the presence of potassium ions relative to sodium ions. Finally, smFET studies of the dynamics of the adenine-sensing pbuE riboswitch aptamer found in Bacillus subtilis are discussed. These results demonstrate how long-lived, ligand-dependent intermediates form at a base-pair level and suggest that these intermediates have consequences for riboswitch-regulation by adenine binding to the aptamer. With the increased time resolution of smFET technology, this work has achieved the first observation of RNA zipping and unzipping at the single-molecule level, as well as label-free observations of the effects of a three-way junction motif on helix zipping and unzipping.

Conselho Nacional de Desenvolvimento CientÃfico e TecnolÃgico / O estudo das propriedades eletrÃnicas, mecÃnicas e vibracionais dos nanotubos de carbono com poucas camadas à importante para desenvolver e aprimorar os modelos que descrevem o comportamento dos nanotubos de parede mÃltipla, que à o tipo de nanotubo mais usado em aplicaÃÃes tecnolÃgicas. Diversos estudos teÃricos e experimentais tÃm sido realizados visando o entendimento do comportamento dos nanotubos de carbono de paredes simples e dupla (SWNT e DWNT, respectivamente) submetidos a altas pressÃes hidrostÃticas. Entretanto, o comportamento de nanotubos de carbono de parede tripla (TWNTs) sob tais condiÃÃes à ainda desconhecido. Neste trabalho, apresentamos um estudo de espectroscopia Raman ressonante em TWNTs em funÃÃo da pressÃo hidrostÃtica. Utilizamos Ãleo de parafina (Nujol) e uma mistura de metanol:etanol na proporÃÃo de 4:1 como meios transmissores de pressÃo (PTM) e uma cÃlula de pressÃo de bigorna de diamante (DAC-Diamond Anvil Cell) para a aplicaÃÃo da pressÃo. A evoluÃÃo dos modos radiais (RBM) e tangenciais (Banda G) em funÃÃo da pressÃo foi analisada de forma detalhada e comparada com os resultados existentes para os nanotubos de parede simples e dupla. Os dados de espectroscopia Raman mostram que os efeitos de blindagem internos dos TWNTs sÃo mais acentuados que nos DWNTs. As modificaÃÃes nas intensidades dos modos Raman foram interpretadas como sendo associadas as mudanÃas nas condiÃÃes de ressonÃncia dos modos RBM em funÃÃo da pressÃo. / The study of the electronic, mechanical and vibrational properties of the carbon nanotubes with few layers is important for developing and improving models that could describe the behavior of multi-walled carbon nanotubes (MWNTs), which is the kind of nanotube most used in technological applications. Several theoretical and experimental studies have been conducted for understanding the behavior of single and double walled carbon nanotubes (SWNT and DWNT, respectively) under high hydrostatic pressures. However, the behavior of triple walled carbon nanotubes (TWNTs) under such conditions is still unknown. Here, we present a study of resonance Raman spectroscopy in TWNTs as function of hydrostatic pressure. We used paraffin oil and a mixture of methanol:ethanol in 4:1 ratio as pressure transmitting media (PTM) and a diamond anvil cell (DAC) for applying pressure. The evolution of the radial breathing modes (RBM) and the tangential modes (G band) as a function of pressure was analyzed in detail and compared with existing results for SWNTs and DWNTs. The Raman spectroscopy data show that the shielding effects of inner tubes in TWNTs are more pronounced than in DWNTs. The changes in the intensities of Raman modes were interpreted as being associated with pressure induced changes in the resonance conditions.

Submitted by Rosivalda Pereira (mrs.pereira@ufma.br) on 2017-06-01T20:30:15Z No. of bitstreams: 1 WesdneySantosMelo.pdf: 2720501 bytes, checksum: 50d1b40146745c9b22c97ac40da583a3 (MD5) / Made available in DSpace on 2017-06-01T20:30:15Z (GMT). No. of bitstreams: 1 WesdneySantosMelo.pdf: 2720501 bytes, checksum: 50d1b40146745c9b22c97ac40da583a3 (MD5) Previous issue date: 2015-12-11 / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) / Fundação de Amparo à Pesquisa e ao Desenvolvimento Científico e Tecnológico do Maranhão (FAPEMA) / In this thesis we studied the structutal, eletronic and magnetic properties of Fe- lled regular and at (8,0), (9,0), (6,6) and (7,7) carbon nanotubes. After the attening of these systems were subjected to hydrogenation and oxygenation. To investigate these properties we use rst principles calculations based on Density Functional Theory, implemented in SIESTA computer code. Our results show that the system Fe- lled at nanotube is stable, and this stability is caused by the interaction between the metal atoms and carbon atoms. We observed that the attening caused a misalignment of wire atoms and dimerization of the nanowire does not cause considerable changes in the distances between an atom and its neighbors. It was observed that when the systems (n, n) were underwent hydrogenation and oxygenation occurred the spontaneous formation of two nanoribbons with zigzag edges. When systems formed by (n, 0) CNT are subjected to hydrogenation and oxygenation, there is no spontaneous production of nanoribbons. Furthermore, it was found that systems formed by a metallic wire between nanoribbons are energetically more stable that systems formed by Fe- lled at (n,0) carbon nanotubes. / Neste trabalho estudamos as propriedades estruturais, eletrônicas e magnéticas de fios lineares de ferro e encapsulados por nanotubos de carbono (8,0), (9,0), (6,6) e (7,7) normais e achatados. Após ́o achatamento estes sistemas foram submetidos à hidrogenação e oxigenação. Para investigar essas propriedades utilizamos cá́lculos de primeiros princípios baseados na teoria do funcional da densidade, implementados no código computacional SIESTA. Nossos resultados mostram que o tubo achatado com o nanofio encapsulado é estável e esta estabilidade deve-se às interações entre os átomos metá́licos e os á́tomos de carbono. Percebeu-se que devido ao achatamento os átomos do fio ficam desalinhados e a dimerização do nanofio nã̃o provoca alterações considerá́veis nas distâncias entre um átomo e seus vizinhos. Observou-se que quando os sistemas (n,n) foram submetidos à hidrogenação e oxigenação houve a formação espontânea de duas nanofitas com bordas zigzag. Os sistemas formados CNTs (n,0) não produziram espontaneamente nanofitas quando submetidos à hidrogenação e à oxigenação. Além disso, verificou-se que energeticamente nanofitas intercaladas com fio metá́lico sã̃o mais está́veis que nanofios encapsulados por nanotubos (n,0) achatados.

Submitted by Rosivalda Pereira (mrs.pereira@ufma.br) on 2017-06-02T19:56:39Z No. of bitstreams: 1 PauloMelo.pdf: 1885214 bytes, checksum: 6465bf341f7075901189f6e8c3bc6680 (MD5) / Made available in DSpace on 2017-06-02T19:56:39Z (GMT). No. of bitstreams: 1 PauloMelo.pdf: 1885214 bytes, checksum: 6465bf341f7075901189f6e8c3bc6680 (MD5) Previous issue date: 2016-07-29 / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) / Fundação de Amparo à Pesquisa e ao Desenvolvimento Científico e Tecnológico do Maranhão (FAPEMA) / Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPQ) / The oxygen reduction reaction (ORR) is a fundamental reactionin the performance of próton exchange membrane fuel cells (PEMFC). In these systems, platinum (Pt) nanoparticles dispersed on Vulcan XC-72 carbon still remains the most widely used system to promote the RRO in aqueous solutions. In the last decades, new carbonaceous materials, as fullerene, single wall carbon nanotubes (SWCNT) and multiwall carbono nanotubes (MWCNT), graphene oxide (GO) and reduced graphene oxide (rGO), were developed and researched as new support materials for electron mediators in different areas, as electrochemistry, sensor, surface science and heterogeneous catalysis. In this work, Pt nanoparticles have been dispersed on Vulcan XC-72, MWCNT, GO e rGO by the alcohol reduction method using ethylene glycol as solvent and reduction agent. Physical characterization of these materials were conducted with energy dispersive Xray spectroscopy (EDS or EDX), X-ray diffraction spectroscopy (DRX), transmission electron microscopy (TEM) and Raman spectroscopy. The electrochemical properties of these materials were investigated, in 1,0 mol L-1 KOH solutions, with the cyclic voltammetry, rotating disk electrode and techniques, and showed that these carbonaceous materials promote the ORR through a peroxide mechanism (2-electrons) and the electrocatalytic activity decreases in the order rGO >> CNT > Vulcan > GO. After modifications with Pt nanoparticles, the ORR proceeds via a direct mechanism (4-electrons) and the electrocatalytic activity decreases in the order Pt/CNT > Pt/Vulcan XC-72 > Pt/GO > Pt/rGO. / A reação de redução de oxigênio (RRO) é uma reação fundamental no desempenho das células à combustível de membrana de troca de prótons (PEMFC). Nestes sistemas, nanopartícula de platina (Pt) dispersa sobre carbono Vulcan XC-72 ainda continua sendo o sistema mais utilizado para promover a RRO em soluções aquosas. Nas últimas décadas, novos materiais carbonáceos, como fulereno, nanotubos de carbono de paredes simples (SWCNT) e de paredes múltiplas (MWCNT), óxido de grafeno (GO) e óxido de grafeno reduzido (rGO), foram desenvolvidos e vêm sendo pesquisados como suporte de mediadores eletrônicos nas áreas de eletroquímica, sensores, ciência de superfície e catálise heterogênea. Neste trabalho, nanopartículas de Pt foram dispersas sobre Vulcan XC-72, MWCNT, GO e rGO pelo processo de redução de álcool utilizando etileno glicol como solvente e agente redutor. Caracterizações físicas destes materiais foram realizadas com as técnicas de espectroscopia de energia dispersiva de raios-X (EDX), espectroscopia de difração de raios-X (DRX), microscopia eletrônica de transmissão (TEM) e espectroscopia Raman. As propriedades eletroquímicas destes materiais foram estudadas, em soluções aquosas KOH 1,0 mol L-1, com as técnicas de voltametria cíclica e eletrodo de disco rotatório, e os resultados mostraram que os materiais carbonáceos promovem a RRO por meio do mecanismo peróxido (2 elétrons) e atividade eletrocatalítica decresce na ordem rGO >> CNT > Vulcan > GO. Após modificações com nanopartículas de Pt, a RRO processa-se de acordo com o mecanismo direto (4 elétrons) e a atividade electrocatalítica indica uma diminuição na seguinte ordem de Pt/CNT > Pt/Vulcan > Pt/GO > Pt/RGO.

Since the discovery of X-rays over a century ago the techniques applied to the engineering of X-ray sources have remained relatively unchanged. From the inception of thermionic electron sources, which, due to simplicity of fabrication, remain central to almost all X-ray applications at this time, there have been few fundamental technological advances. The emergence of new materials and manufacturing techniques has created an opportunity to replace the traditional thermionic devices with those that incorporate Field Emission electron sources. One of the most important attributes of Field Emission X-ray sources is their controllability, and in particular the fast response time, which opens the door to applying techniques which have formerly been the preserve of optical systems. The work in this thesis attempts to bridge the gap between the fabrication and optimisation of the vacuum electronic devices and image processing aspects of a new approach to high speed radiographic imaging, particularly with a view to addressing practical real-world problems. Off the back of a specific targeted application, the project has involved the design of a viable field emission X-ray source, together with the development of an understanding of the failure modes in such devices, both by analysis and by simulation. This thesis reviews the capabilities and the requirements of X-ray sources, the methods by which nano-materials may be applied to the design of those devices and the improvements and attributes that can be foreseen. I study the image processing methods that can exploit these attributes, and investigate the performance of X-ray sources based upon electron emitters using carbon nanotubes. Modelling of the field emission and electron trajectories of the cathode assemblies has led me to the design of equipment to evaluate and optimise the parameters of an X-ray tube, which I have used to understand the performance that is achievable. Finally, I draw conclusions from this work and outline the next steps to provide the basis for a commercial solution.

>Magister Scientiae - MSc / The purpose of this study was to develop a high performance-lower cost catalyst to be applied in Direct Methanol Fuel Cells (DMFC). The study also aimed to prepare plurimetallic supported platinum (Pt), platinum-ruthenium (PtRu), platinum-ruthenium-vanadium (PtRuV) and platinum ruthenium-vanadium-iron (PtRuVFe) upon multi-walled carbon nanotube (MWCNT) as well as upon multiwalled carbon nanotube-titanium oxide (MWCNT/TiO2) supports. Platinum is very active but prone to poisoning by carbon monoxide (CO), which may be present in the fuel used in fuel cells. The focus on the use of methanol was because of its better reaction kinetics, and better performance in direct methanol fuel cells (DMFC) better than proton exchange membrane fuel cell (PEMFC). When Pt is alloyed with another platinum group metals (PGM) the alloying decreases the over-potential for reactions critical in the fuel cells. Proton exchange membrane fuel cell (PEMFC) performance may be improved at low metal loading, when supported pluri-metallic catalysts are applied since the trimetallic catalysts may promote high catalyst utilisation. In practice, DMFC require electrodes with a Pt loading to achieve acceptance fuel cell (FC) power performance. The aim of this study was therefore the reduction of the catalyst loading through further improvement of mass activity of Pt based catalysts by partial substitution of the noble metal/metals, and the use of a carbon support that will provide high surface area, good electrical conductivity and high stability. MWCNT supported pluri-metallic (PtRuVFe,) and bimetallic (PtRu) nanoparticles possessed characteristic of increased surface area, improved electron transfer rate, enhance electro-catalytic activity and promoted stability.

Neste trabalho apresentamos estruturas poliméricas funcionalizadas com nanotubos de carbono, as quais são processadas utilizando técnicas de fabricação a laser. Inicialmente apresentamos uma metodologia para incorporar nanotubos de carbono de parede simples, funcionalizados com ácido carboxílico (NTCPS-COOH) em resinas acrílicas. A funcionalização dessas resinas foi alcançada, sendo possível incorporar nanotubos em uma faixa de 0,01% até 1%, em peso. Adicionalmente, visando aplicações em óptica e optoeletrônica, a inserção de Rodamina B ou MEH-PPV junto às resinas funcionalizadas com nanotubos também foi realizada. Através da técnica de polimerização via absorção multifotônica, microestruturas tridimensionais com boa resolução (aproximadamente 650 nm) e integridade foram fabricadas com essas resinas. A espectroscopia Raman mostrou que os NTCSPS-COOH estão distribuídos por todo o interior das microestruturas, característica necessária para aplicação em dispositivos. A funcionalização das estruturas não se restringiu apenas ao volume. Microestruturas acrílicas foram funcionalizadas com NTCPS-COOH apenas em sua superfície, utilizando a combinação das técnicas de adição de Michael e acoplamento carbodiimida. Análises Raman mostraram também uma boa distribuição dos nanotubos na superfície das amostras funcionalizadas. Mesmo as estruturas que foram funcionalizadas com baixas concentrações de NTCPS-COOH exibiram melhorias nas propriedades mecânicas e elétricas. Estruturas funcionalizadas com 0,01% (em peso) de NTCPS-COOH se mostraram mais resistentes em ensaios de indentação do que as amostras não funcionalizadas. Do ponto de vista elétrico, estruturas com a mesma faixa de funcionalização apresentaram condutividade elétrica superior em duas ordens de grandeza em comparação ao polímero acrílico puro. Por fim, estruturas macroscópicas funcionalizadas com Rodamina B e nanotubos de carbono apresentam potencial aplicabilidade em experimentos de laseres aleatórios. Utilizando microestruturação direta a laser, a fabricação de padrões periódicos dentro dessas estruturas alterou a emissão característica do laser aleatório, fixando os picos de emissão em comprimentos de onda específicos. / In this work we present polymeric structures functionalized with carbon nanotubes, which are processed using laser fabrication techniques. Firstly, we present a methodology to incorporate single-walled carbon nanotubes, functionalized with carboxylic acid (SWCNT-COOH) into acrylate resins. The resins functionalization was obtained, being possible to incorporate nanotubes in a range of 0.01% to 1% by weight. In addition, aiming at optical and optoelectronic applications, such functionalized resins can also be mixed with Rhodamine B or MEH-PPV. Through the multiphoton absorption polymerization technique, threedimensional microstructures presenting good resolution (approximately 650 nm) and integrity were fabricated using these resins. Raman spectroscopy showed that SWCNT-COOH are distributed throughout the volume of the microstructures, a required feature for devices applications. The structures functionalization was not restricted just to the volume. Acrylate microstructures were functionalized with SWCNT-COOH only on their surface, using the combination of Michael addition and carbodiimide coupling techniques. Raman analyzes also showed good distribution of the nanotubes on the polymeric surface. Even structures which were functionalized with low concentrations of SWCNT-COOH exhibited improvements in mechanical and electrical properties. Functionalized structures with 0.01% (by weight) of SWCNT-COOH proved to be more resistant in indentation tests than non-functionalized samples. Regarding the electrical properties, structures with the same functionalization range showed higher conductivity (in two orders) compared to the pure acrylate polymer. Finally, macroscopic structures, functionalized with Rhodamine B and carbon nanotubes present potential applicability in random laser experiments. Using direct laser writing, periodic patterns were fabricated within these functionalized structures, changing the characteristic emission of the random laser, setting the emission peaks at specific wavelengths.