Numéro |
J. Phys. IV France
Volume 137, November 2006
|
|
---|---|---|
Page(s) | 273 - 281 | |
DOI | https://doi.org/10.1051/jp4:2006137054 | |
Publié en ligne | 23 décembre 2006 |
J. Bodzenta, M. Dzida and T. Pustelny
J. Phys. IV France 137 (2006) 273-281
DOI: 10.1051/jp4:2006137054
Nonlinear optothermoacoustic phenomena in highly diluted suspensions of gold nanoparticles
S.V. Egerev1 and A.A. Oraevsky21 Andreyev Acoustics Institute, Moscow 117036, Russia
2 Fairway Medical Technologies, 9431 W. Sam Houston Parkway South, Houston, Texas 77099, USA
(Published online 23 December 2006)
Abstract
Optoacoustic (OA) sensor was designed, fabricated and used to detect
spherical gold nanoparticles (NPs) in suspensions at the level of up
to a single particle. The sensor operating in the backward mode was
designed to measure signals from microscopic volumes of
nanoparticulate suspensions in water. Thermal nonlinearity was
observed in the course of OA signal generation. The irradiation of
the microvolume of gold nanoparticles gives rise to a multitude of
thermomechanical processes, including heating of NPs above the
vaporization temperature, thermal diffusion from nanoparticles to
water and formation of vapor nanobubbles. As a result, a specific
acoustic signal is produced exhibiting nonlinear behaviour with
respect to the incident laser pulse energy. The optoacoustic profile
of the laser-induced signal generated in a thin layer of highly
diluted suspensions of gold nanospheres was examined thereby
providing a basis for a method for detection of metal nanoparticles
with high sensitivity.
© EDP Sciences 2006