Biomedical Engineering Reference
In-Depth Information
color can change with pH of the solution. h ey are used in histological stain
as well as antiseptic and antibacterial application. CV molecules also have
applications in fertilizers and ball pen inks. h ere are also previous reports
on SERS due to CV molecules on dif erent substrates [64]. Excitation by
laser near the localized surface plasmon resonance (SPR) of gold core-shell
particles is better than simply the closeness to the SPR of gold nanopar-
ticles deposited on core-shell particles. h ey have the advantage that they
provide large surface area due to their large area providing platform for
accommodating large number of nanoparticles. Nanoparticles themselves
provide surface roughness desired for enhancing the Raman signal due to
increased localized electric i eld.
A spectrum was observed for CNT prepared in lab using Chemical
vapor deposition method and enhancement in signal was observed as they
interacted with SiO
2
@Au core-shell nanocomposites.
4.11 Conclusions
It has been shown that consistent with previous reports the enhancement
of signals can depend on particular vibrations as well as overall closeness
of the laser excitation wavelength to the SPR wavelength of the substrate.
We i nd in general that speckled SiO
2
@Au core-shell particles are promis-
ing SERS material.
Acknowledgements
We are thankful to Prof. Aditya Shastri, Vice Chancellor of Banasthali
Vidyapith for kindly extending the facilities of ''Banasthali Centre for
Education and Research in Basic Sciences” sanctioned under CURIE pro-
gramme of the Department of Science and Technology, New Delhi.
References
1.
A. S. Tawi k, A Strategy for Integrating Basic Concepts of Nanotechnology
to Enhance Undergraduate Nano-Education:
Statistical Evaluation of an
Application Study, A journal of nanoeducation
, 4, 1, 2013.
2.
M. C. Roco, C. A. Mirkin, and M. C. Hersam, Nanotechnology research
directions for societal needs in 2020: summary of international study,
Journal
of nanoparticle research
, 2011, doi: 10.1007/s11051-011-0275-5.
