Formation and optical properties of fluorescent gold nanoparticles obtained by matrix sputtering method with volatile mercaptan molecules in the vacuum chamber and consideration of their structures

Langmuir : the ACS Journal of Surfaces and Colloids
Taiki SumiTetsu Yonezawa

Abstract

This paper proposes a novel methodology to synthesize highly fluorescent gold nanoparticles (NPs) with a maximum quantum yield of 16%, in the near-infrared (IR) region. This work discusses the results of using our (previously developed) matrix sputtering method to introduce mercaptan molecules, α-thioglycerol, inside the vacuum sputtering chamber, during the synthesis of metal NPs. The evaporation of α-thioglycerol inside the chamber enables to coordinate to the "nucleation stage" very small gold nanoclusters in the gas phase, thus retaining their photophysical characteristics. As observed through transmission electron microscopy, the size of the Au NPs obtained with the addition of α-thioglycerol varied from approximately 2-3 nm to approximately 5 nm. Plasmon absorption varied with the size of the resultant nanoparticles. Thus, plasmon absorption was observed at 2.4 eV in the larger NPs. However, it was not observed, and instead a new peak was found at approximately 3.4 eV, in the smaller NPs that resulted from the introduction of α-thioglycerol. The Au NPs stabilized by the α-thioglycerol fluoresced at approximately 1.8 eV, and the maximum wavelength shifted toward the red, in accordance with the size of the NPs. A maximum fl...Continue Reading

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Citations

Sep 8, 2015·Physical Chemistry Chemical Physics : PCCP·Yoshikiyo HatakeyamaKeiko Nishikawa
Nov 1, 2016·Langmuir : the ACS Journal of Surfaces and Colloids·Matteo PortaTetsu Yonezawa
Oct 21, 2015·Scientific Reports·Yohei IshidaTetsu Yonezawa
Feb 1, 2018·Langmuir : the ACS Journal of Surfaces and Colloids·Lianlian DengTetsu Yonezawa
Oct 4, 2017·Langmuir : the ACS Journal of Surfaces and Colloids·Mai Thanh NguyenTetsu Yonezawa
Dec 1, 2017·Accounts of Chemical Research·Yohei IshidaTetsu Yonezawa
Mar 10, 2020·Langmuir : the ACS Journal of Surfaces and Colloids·Lianlian DengTetsu Yonezawa

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