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Title: Thermocouple-tip-exposing temperature assessment technique for evaluating photothermal conversion efficiency of plasmonic nanoparticles at low laser power density

Abstract

A new thermocouple (TC) tip-exposing temperature assessment technique that combines experimental temperature measurements with a numerical model of the photothermal conversion efficiency η is presented. The proposed technique is designed to evaluate η for a gold-coated superparamagnetic iron oxide nanoparticle (SPIO-Au NP) solution (26 nm, 12–70 ppm) at low continuous wave laser power (103 mW, 532 nm) irradiation in a convenient manner under ambient conditions. The TC tip temperature is measured during the first 30 s of the laser exposure, and the results are combined with a finite element model to simulate the temperature rise of the NP solution for a given concentration. The value of η is adjusted in the model until the model agrees with the measured transient TC temperature rise. Values of η = 1.00 were observed for all concentrations. Theoretical predictions of η derived by Mie theory confirmed the near unity conversion efficiency of the as-synthesized SPIO-Au NPs. Advantages of the current technique include co-locating the TC tip in the geometric center of the laser-heated region, rather than outside of this region. In addition, the technique can be done under ambient room conditions using unmodified commercially available hardware.

Authors:
 [1]; ORCiD logo [1];  [2];  [2]
  1. Texas A & M Univ., College Station, TX (United States)
  2. Stony Brook Univ., NY (United States)
Publication Date:
Research Org.:
State Univ. of New York (SUNY), Albany, NY (United States); Texas A & M Univ., College Station, TX (United States). Texas A & M Engineering Experiment Station
Sponsoring Org.:
USDOE Advanced Research Projects Agency - Energy (ARPA-E)
OSTI Identifier:
1613641
Alternate Identifier(s):
OSTI ID: 1563000
Grant/Contract Number:  
AR0000531; AR0000945
Resource Type:
Accepted Manuscript
Journal Name:
Review of Scientific Instruments
Additional Journal Information:
Journal Volume: 90; Journal Issue: 9; Journal ID: ISSN 0034-6748
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
77 NANOSCIENCE AND NANOTECHNOLOGY; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; Instruments & Instrumentation; Physics; Finite-element analysis; Numerical methods; Cells; Laser surgery; Thermo optic effects; Transition metals; Plasmonics; Nanomedicine; Nanoparticles

Citation Formats

Yuan, Muzhaozi, Wang, Ya, Hwang, David, and Longtin, Jon P. Thermocouple-tip-exposing temperature assessment technique for evaluating photothermal conversion efficiency of plasmonic nanoparticles at low laser power density. United States: N. p., 2019. Web. https://doi.org/10.1063/1.5109117.
Yuan, Muzhaozi, Wang, Ya, Hwang, David, & Longtin, Jon P. Thermocouple-tip-exposing temperature assessment technique for evaluating photothermal conversion efficiency of plasmonic nanoparticles at low laser power density. United States. https://doi.org/10.1063/1.5109117
Yuan, Muzhaozi, Wang, Ya, Hwang, David, and Longtin, Jon P. Fri . "Thermocouple-tip-exposing temperature assessment technique for evaluating photothermal conversion efficiency of plasmonic nanoparticles at low laser power density". United States. https://doi.org/10.1063/1.5109117. https://www.osti.gov/servlets/purl/1613641.
@article{osti_1613641,
title = {Thermocouple-tip-exposing temperature assessment technique for evaluating photothermal conversion efficiency of plasmonic nanoparticles at low laser power density},
author = {Yuan, Muzhaozi and Wang, Ya and Hwang, David and Longtin, Jon P.},
abstractNote = {A new thermocouple (TC) tip-exposing temperature assessment technique that combines experimental temperature measurements with a numerical model of the photothermal conversion efficiency η is presented. The proposed technique is designed to evaluate η for a gold-coated superparamagnetic iron oxide nanoparticle (SPIO-Au NP) solution (26 nm, 12–70 ppm) at low continuous wave laser power (103 mW, 532 nm) irradiation in a convenient manner under ambient conditions. The TC tip temperature is measured during the first 30 s of the laser exposure, and the results are combined with a finite element model to simulate the temperature rise of the NP solution for a given concentration. The value of η is adjusted in the model until the model agrees with the measured transient TC temperature rise. Values of η = 1.00 were observed for all concentrations. Theoretical predictions of η derived by Mie theory confirmed the near unity conversion efficiency of the as-synthesized SPIO-Au NPs. Advantages of the current technique include co-locating the TC tip in the geometric center of the laser-heated region, rather than outside of this region. In addition, the technique can be done under ambient room conditions using unmodified commercially available hardware.},
doi = {10.1063/1.5109117},
journal = {Review of Scientific Instruments},
number = 9,
volume = 90,
place = {United States},
year = {2019},
month = {9}
}

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