Biomedical Engineering Reference
In-Depth Information
4
Fabrication, Properties of Nanoshells
with Controllable Surface Charge
and its Applications
Parul Khurana, Sheenam h
atai* and Dinesh Kumar
Department of Chemistry, Banasthali Vidyapith, Rajasthan, India
Abstract
Nanomaterials plasmonics is an emerging research i eld that deals with the fab-
rication and optical characterization of noble metal nanoparticles of various size,
shape, structure and plasmon resonances over VIS-NIR spectral band. h e recent
advances in synthesis, characterization, electromagnetic simulation, and surface
functionalization of plasmonic nanoparticles by porous silica-coated nanostruc-
tures have led to a publication storm in discoveries and potential applications of
plasmon-resonant nanomaterials. h e advanced and high-quality synthesis of
porous silica-coated nanostructures is increasing research interests for its impor-
tant properties and diverse applications, as for catalytic, detection of heavy metal
ions in water, colorimetric diagnostics, photothermal therapy, surface enhanced
Raman scattering (SERS) detection, and so forth. Here we will focus on up-to-
date synthesis strategies, improved properties and emerging applications of silica-
coated metal nanoparticles. We have synthesized core-shell particles with metal
(Ag, Au) shell and SiO
2
as core. h e particles will be investigated using UV-Vis-
NIR spectroscopy, FTIR, Raman spectroscopy, X-ray dif raction, scanning electron
microscopy (SEM) and transmission electron microscopy (TEM). Further interac-
tion of these core-shell materials with carbon nanotubes (CNT) has been investi-
gated using optical spectroscopy and Raman spectroscopy and will be discussed.
Nanoshell materials with controllable surface charge (zeta potential) has allowed
optimization using the adsorption of CNT for ultrasensitive analysis using SERS.
Keywords:
Core-shell nanomaterials,
carbon nanotubes, surface plasmon
resonance (SPR), surface enhanced Raman spectroscopy (SERS), raman
enhancement
