Photothermal lens detection of gold nanoparticles: theory and experiments.

Photothermal lens detection of gold nanoparticles: theory and experiments. Research Abstract Details 

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Photothermal lens detection of gold nanoparticles: theory and experiments. Abstract Text:

Anton V Brusnichkin,Dmitry A Nedosekin,Mikhail A Proskurnin,Vladimir P Zharov,Anton V Brusnichkin,Dmitry A Nedosekin,Mikhail A Proskurnin,Vladimir P Zharov,

An approach for mode-mismatched two-beam (pump-probe) photothermal lens detection of multipoint light-absorbing targets in solution (e.g., gold nanoparticles) is developed for continuous-wave intensity-modulated laser-excitation mode. A description of the blooming of the thermooptical element (thermal lens) upon absorption of the excitation laser radiation is based on the summation of individual thermal waves from multiple heat sources. This description makes it possible to estimate the irregularities of the temperature (and, thus, the refractive index) profile for a discrete number of nanoparticles in the irradiated area and a change in the concentration and particle size parameters. Experimental results are in good agreement with theoretical dependences of the photothermal signal on nanoparticle size and concentration and excitation laser power. Calibration plots for particles from 2 to 250 nm show long linear ranges, limits of detection of gold nanoparticles at the level of hundreds of nanoparticles with the current setup, and the photothermal-lens sensitivity coefficient increases as a cubic function of particle size. Further improvements are discussed, including increasing the sensitivity thresholds up to one nanoparticle in the detected volume.

Photothermal lens detection of gold nanoparticles: theory and experiments. Publishing Authors By Initials

AV Brusnichkin,DA Nedosekin,MA Proskurnin,VP Zharov,AV Brusnichkin,DA Nedosekin,MA Proskurnin,VP Zharov,

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Photothermal lens detection of gold nanoparticles: theory and experiments. Journal Published:

PUBLICATION TYPE: Research Support, N.I.H., Extr

Journal: Applied spectroscopy

VOLUME: 61

Page Numbers: 1191-201

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ISSN: 0003-7028

DAY: 21

MONTH: Nov

YEAR: 2007

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LANGUAGE: eng

NlmUniqueID: 372406

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Grant and Affiliation Information for Photothermal lens detection of gold nanoparticles: theory and experiments.

AFFILIATION: M. V. Lomonosov Moscow State University, Chemistry Department, Vorob'evy Hills 1/3, GSP-3 Moscow, Russia.

Country: United States

AGENCY: United States NIBIB

GRANT: EB 00873

ACRONYM: EB

MEDLINETA: Appl Spectrosc

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