期刊
JOURNAL OF NANOPARTICLE RESEARCH
卷 21, 期 6, 页码 -出版社
SPRINGER
DOI: 10.1007/s11051-019-4566-6
关键词
Photothermal lens spectrometry; Detection of gold nanoparticles; Z-scan; Photothermal effects; Detection of biomolecules
资金
- Brazilian agency CAPES
- US National Science Foundation [1831332, 1744502, 1719379]
- Mexican Agency CONACYT
- Mexican Agency CCA-IPN
- Direct For Education and Human Resources
- Division Of Human Resource Development [1719379] Funding Source: National Science Foundation
- Div Of Chem, Bioeng, Env, & Transp Sys
- Directorate For Engineering [1831332] Funding Source: National Science Foundation
- Div Of Engineering Education and Centers
- Directorate For Engineering [1744502] Funding Source: National Science Foundation
We study the photothermal response of water solution of 10-, 50-, and 100-nm gold nanoparticles as a function of concentration under irradiation of a continuous wave 6-W 445-nm diode laser. The method allows determining concentrations as low 8x10(-7)mg/ml, which corresponds to the detection of a single nanoparticle of 100- and 50-nm diameter or about 1000 nanoparticles of 10-nm diameter. The results demonstrate the application for the study of the optical response of a single nanoparticle in water suspension. We discuss the potential applications of the finding for detection of low concentration of biomolecules using a single nanoparticle.
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