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Photothermal detection of a single gold nanoparticle in water suspension

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Abstract

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 8 × 10−7 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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Funding

The Brazilian agency CAPES financially supported the sandwich doctorate scholarship of the student M. Lima in the Delaware State University. A. Marcano was provided support from the US National Science Foundation (awards 1831332, 1744502, and 1719379), G. López was financially supported by the Mexican Agencies CONACYT and the CCA-IPN.

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Correspondence to Marcenilda Amorim Lima.

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The authors declare that they have no conflict of interest.

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Lima, M.A., Olaizola, A.M., Gamboa, G.L. et al. Photothermal detection of a single gold nanoparticle in water suspension. J Nanopart Res 21, 118 (2019). https://doi.org/10.1007/s11051-019-4566-6

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  • DOI: https://doi.org/10.1007/s11051-019-4566-6

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