5 / 52
Polymer Chemistry 2018
Polymer Sciences
ISSN: 2471-9935
Page 25
March 26-28, 2018
Vienna, Austria
3
rd
Edition of International Conference and Exhibition on
Polymer Chemistry
T
hin films or nanocrystalline particles of metal-oxide
materials are an important class of inorganic polymers.
Nanotechnology,bywhichthesematerialsarebeingsynthesized
is an active area of current research activities in various fields,
including energy production, medicines, electronics etc. In
a span of past few decades nanomaterials have attracted a
great research interest due to their unique properties and novel
potential applications. Out of these, non-stoichiometric SnO
2
nanoparticles form an important class of materials which is a
wide gap (3.64 eV), transparent in visible and NIR region, n-type
semiconductor. It has a wide range of applications in the field
of optics, electronics and catalysis. Oxide or mixed metal
oxide nanomaterials of tin are an important class of materials
because of their tunable physico-chemical properties. On
the other hand, they have high chemical and mechanical
strength. These materials have wide spread applications as
gas sensors, transparent conducting electrodes e.g. solar
cells, optoelectronic devices and as a catalyst for oxidation of
solids. Structural features of the SnO
2
lattice can be controlled
using various dopants in suitable concentrations and hence
it’s optical and electrical properties can also be controlled
accordingly. Many synthetic routes have been developed for the
preparation of SnO
2
nanoparticle or films such asMOCVD, spray
pyrolysis, hydrothermal route, sputtering of oxides and sol-gel
technology. Out of these methods sol-gel technology (that
involves a series of hydrolysis and polymerization reactions)
is simple to perform by which homogeneity in composition
as well as in morphology of nanoparticles could be achieved
with high purity at comparatively low temperatures. This low
temperature condition allows deposition of thin films of oxides
at soft surfaces. Our previous studies on Sol-gel technology
using metallorganic derivatives as single source molecular
precursors and also by others are in good agreement with this.
In this report some structural, electrical and optical aspects of
these materials (pure and doped) will be discussed in detail
and will be compared with the results obtained from the
studies on the sol-gel synthesis of mixed metal oxide (xSnO
2
.
SrO) nanoparticles of SnO
2
with SrO in basic medium. Results
from XRD, SEM, TEM and electron diffraction patterns have
shown the structural features of these SnO
2
nanoparticles.
Electrical properties have been discussed with respect to
carrier concentration and carrier mobility that ultimately
effects the conductance in these materials. Particle size also
play an important role. Optical properties are determined by
direct energy band gap between conduction and valence band.
Results from UV-vis spectroscopy (absorption, reflectance and
transmittance) show the actual band gap in these materials.
Direct measurement of the bad gap (Eg) from the intercept of
the energy axis in Tauc Plots, show its dependence on the type
of dopant and its concentration and also on particle size.
Biography
Dr. Vinita Sharma is Associate Professor in Chemistry at Department of
Higher Education, State Government of Rajasthan, India, Received
M.Sc.,
Ph.D. in 2003 from University of Rajasthan, Jaipur, also carried out some
research work at Bhabha Atomic Research Center-Mumbai, Post doctorate
(2004-2007) from University of Rajasthan, Jaipur, working with present em-
ployer since last 15 years. Published 15 papers and 3 review articles in the
field of metallorganic derivatives and materials Chemistry in the Journals of
international repute and presented around 16 papers in various internation-
al/national seminars/conferences. Delivered 5 invited talks in conferences.
Meanwhile received Research Award from UGC New Delhi of Central Gov-
ernment and Young Scientist award from Indian Chemical Society.
vinibns@yahoo.co.inS
n
O
2
nanoparticles: their structural, electrical and
optical properties
Vinita Sharma
BBD Government College, Chimanpura, Shahpura, Jaipur, Rajasthan, India-303103
Vinita Sharma, Polym Sci, Volume 4
DOI: 10.4172/2471-9935-C1-008