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. 2021 Dec 31;12(1):145. doi: 10.3390/nano12010145

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© 2021 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).

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Characterization of Au₂₆ cluster. (A) The formation of Au clusters. (B) Fluorescence excitation and emission spectra of Au clusters. (C) Photo images of Au clusters under visible (1) and a portable UV lamp (2). The excellent fluorescence properties of Au clusters can make them be used as fluorescent inks. e.g., “TRICAAS” was written using Au clusters emitting red fluorescence under a portable UV lamp. “TRICAAS” is the abbreviation of our affiliation institution. (D) Absorption spectra of peptide and Au clusters. (E,F) XPS spectrum of Au 4f and S 2P of Au clusters. (G) MALDI-TOF-MS spectrum of Au clusters. The mass of the Au₂₆P₉ molecule fragment could be written by Au₂₆P_xS_18–2x, where x ranges from 0 to 9, P represents the peptide, and S represents sulfur.