<p>Understanding how light interacts
with the matter is essential for developing future opto-electronic devices.
Furthermore, tuning such light-matter interaction requires designing new
material platforms that is essential for developing devices which are functional
in different light wavelength regimes. Among these designs, particle-in-matrix,
multilayer or nanowire morphology, consisting of metal and dielectric materials,
have been demonstrated for achieving improved physical and optical properties,
such as ferroelectricity, ferromagnetism and negative refraction. For example,
Au-TiO<sub>2</sub> two phase nanocomposite has been explored in this
dissertation as a way of achieving enhanced photocatalysis. However, due to the
availability of a limited range of structures in terms of crystallinity and
morphology in the two-phase nanocomposites, a greater design flexibility and
structural complexity along with versatile growth techniques are needed for
developing next generation integrated photonic and electronic devices. This can
be achieved by incorporating a third phase through the three phase
nanocomposite designs by judicious selection of materials and functionalities. </p>
<p>In this dissertation, a new nanocomposite
design having three different phases has been introduced: Au, BaTiO<sub>3</sub>
and ZnO, which grow in a highly ordered ‘nanoman’-like structure. More
interestingly, the three phases in the novel ‘nanoman’-like structure combine
to give an emergent new property which are not found individually in the three
phases. The ordered ‘nanoman’-like structures enable a high degree of
tunability in their optical and electrical properties, including the hyperbolic
dispersion in the visible and near infrared regime, in addition to the
prominent ferroelectric/piezoelectric properties. Moreover, the growth kinetics
and the thermal stability (using in-situ Transmission Electron Microscopy) of
the ‘nanoman’ structures has also been studied. This study introduces a new
growth paradigm of fabricating three-phase nanocomposite that will surely generate
wide interests with potential applications to different systems. The ordered
three-phase ‘nanoman’ structures present enormous opportunities for novel
complex nanocomposite designs towards future optical, electrical and magnetic
property tuning.</p>
| Identifer | oai:union.ndltd.org:purdue.edu/oai:figshare.com:article/12664847 |
| Date | 05 August 2020 |
| Creators | Shikhar Misra (9132629) |
| Source Sets | Purdue University |
| Detected Language | English |
| Type | Text, Thesis |
| Relation | https://figshare.com/articles/thesis/Metal-Oxide_Nanocomposite_for_Tunable_Physical_Properties/12664847 |
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