Global ETD Search

11	Luminescence and photoelectrochemical properties of size-selected aqueous copper-doped Ag–In–S quantum dots Raevskaya, Alexandra, Rozovik, Oksana, Novikova, Anastasiya, Selyshchev, Oleksandr, Stroyuk, Oleksandr, Dzhagan, Volodymyr, Goryacheva, Irina, Gaponik, Nikolai, Zahn, Dietrich R. T., Eychmüller, Alexander 11 June 2018 (has links) Ternary luminescent copper and silver indium sulfide quantum dots (QDs) can be an attractive alternative to cadmium and lead chalcogenide QDs. The optical properties of Cu–In–S and Ag–In–S (AIS) QDs vary over a broad range depending on the QD composition and size. The implementation of ternary QDs as emitters in bio-sensing applications can be boosted by the development of mild and reproducible syntheses directly in aqueous solutions as well as the methods of shifting the photoluminescence (PL) bands of such QDs as far as possible into the near IR spectral range. In the present work, the copper-doping of aqueous non-stoichiometric AIS QDs was found to result in a red shift of the PL band maximum from around 630 nm to ∼780 nm and PL quenching. The deposition of a ZnS shell results in PL intensity recovery with the highest quantum yield of 15%, with almost not change in the PL band position, opposite to the undoped AIS QDs. Size-selective precipitation using 2-propanol as a non-solvent allows discrimination of up to 9 fractions of Cu-doped AIS/ZnS QDs with the average sizes in the fractions varying from around 3 to 2 nm and smaller and with reasonably the same composition irrespective of the QD size. The decrease of the average QD size results in a blue PL shift yielding a series of bright luminophors with the emission color varies from deep-red to bluish-green and the PL efficiency increases from 11% for the first fraction to up to 58% for the smallest Cu-doped AIS/ZnS QDs. The rate constant of the radiative recombination of the size-selected Cu-doped AIS/ZnS QDs revealed a steady growth with the QD size decrease as a result of the size-dependent enhancement of the spatial exciton confinement. The copper doping was found to result in an enhancement of the photoelectrochemical activity of CAIS/ZnS QDs introduced as spectral sensitizers of mesoporous titania photoanodes of liquid-junction solar cells. info:eu-repo/classification/ddc/540 ddc:540
12	Combining induced protease fragment assembly and microarray analysis to monitor signaling in living cells. / Combining induced protease fragment assembly and microarray analysis to monitor signaling in living cells. Botvinnik, Anna 25 June 2009 (has links) No description available. 570 Biowissenschaften Biologie ERBB Microarray Signalübertragung Hochdurchsatz Reporter Gen cis-element TEV ERBB microarray signal transduction high throughput reporter gene cis-element TEV 30.03 42.03 42.13 42.15 42.99 WA 700: Systeme in der Biologie WH 000: Cytologie {Biologie} WH 100: Cytologische Methoden WHC 700: Zellrezeptoren Zellrezeptoren Membranrezeptoren Zelluläre Kommunikation {Cytologie} WR 000: Biotechnologie {Biologie} WR 100: Methoden in der Biotechnologie Bioverfahrenstechnik {Biologie} WR 650 WR 870: Biosensoren Biosensorik {Biologie Biotechnologie}

Search results

Luminescence and photoelectrochemical properties of size-selected aqueous copper-doped Ag–In–S quantum dots

Combining induced protease fragment assembly and microarray analysis to monitor signaling in living cells. / Combining induced protease fragment assembly and microarray analysis to monitor signaling in living cells.