Controlled diluted aqua regia addition leads to NIR (near infrared) luminescence from aggregated gold nanoparticles at 916 nm. This turn-on luminescence has been observed for gold nanoparticles, regardless of reductants used in their preparation. These aggregated nanoparticles are nontoxic and have been used for bioimaging in human liver carcinoma cells.
M. Saini, Y. Masirkar, R. Varshney, P. Roy and K. K. Sadhu, Chem. Commun., 2017, 53, 6199 DOI: 10.1039/C7CC00641A
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