Journal
ACS OMEGA
Volume 5, Issue 42, Pages 27164-27170Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsomega.0c03124
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Funding
- National Science Foundation of China [21275107]
- Fundamental Research Funds for the Central Universities (Tongji) [1380219126, 22120180514]
- Shanghai Science and Technology Commission through Shanghai Key Laboratory of Chemical Assessment and Sustainability [14DZ2261100]
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Although thermal conductivity gas analyzers are ubiquitous in industry, shrinking the sensing unit to a microscopic scale is rarely achieved. Since heat transfer between a metal nanoparticle and its ambient gas changes the temperature, refractive index, and density of the gaseous surrounding, one may tackle the problem using a single nanoparticle's photothermal effect. Upon heating by a 532 nm laser, a single gold nanoparticle transfers heat to the surrounding gas environment, which results in a change in the photothermal polarization of a 633 nm probe laser. The amplitude of the photothermal signal correlates directly with the concentration of binary gas mixture. In He/Ar, He/N-2, He/air, and H-2/Ar binary gas mixtures, the signal is linearly proportional to the He and H-2 molar concentrations up to about 10%. The photothermal response comes from the microscopic gaseous environment of a single gold nanoparticle, extending from the nanoparticle roughly to the length of the gas molecule's mean free path. This study points to a way of sensing binary gas composition in a microscopic volume using a single metal nanoparticle.
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