Gold Nanocrystals Growth in the Mixture of Primary Alcohols

Authors	Т.I. Borodinova¹ , V.I. Sapsay², V.R. Romanyuk³
Affiliations	¹ F.D. Ovcharenko Institute of Biocolloid Chemistry, NAS of Ukraine, 42, Vernadsky Ave., 03680 Kyiv, Ukraine ² M.G. Kholodny Institute of Botany, NAS of Ukraine, 2, Tereshchenkivska Str., 01601 Kyiv, Ukraine ³ V. Lashkaryov Institute of Semiconductor Physics, NAS of Ukraine, 41, Nauki Prosp., 03028 Kyiv, Ukraine
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Issue	Volume 7, Year 2015, Number 1
Dates	Received 10 December 2014; revised manuscript received 10 March 2015; published online 25 March 2015
Citation	Т.I. Borodinova, V.I. Sapsay, V.R. Romanyuk, J. Nano- Electron. Phys. 7 No 1, 01032 (2015)
DOI
PACS Number(s)	61.46.Hk, 81.10. – h
Keywords	Gold nanocrystals, Nanoprisms, Chloroauric acid, Ethylene glycol, Ethyl alcohol, Polyvinyl-pyrrolidone, Synthesis in non-aqueous medium.
Annotation	The process of gold nanocrystals formation and growth in non-aqueous medium had been studied. The formation of the nanocrystals takes place at the temperature of 80° ± 1 °C from gold atoms produced as a result of chemical reduction of the precursor (chloroauric acid) in a mixture of ethylene glycol and ethanol in the presence of polyvinylpyrrolidone (PVP) acting as a stabilizer. It had been demonstrated by TEM, SEM and optical microscopy that the crystals formed are in the form of flat nanoprisms (NP) with hexagonal or triangular base. These NP have thickness in the nanoscale range. Monocrystallinity of the NP had been confirmed by electron diffraction and X-ray analysis. The X-ray analysis testifies that gold nanocrystals have no foreign atom impurities. The experimentally determined parameters of synthesis (HAuCl4 and PVP, ethanol and ethylene glycol ratios, time and temperature) allow to obtain the NP with the linear dimensions of tens of nanometers to tens of microns. Possible mechanisms of crystal growth and the impact of PVP stabilizer on their morphology are discussed. It had been demonstrated by micro-Raman spectroscopy that the interaction of the stabilizer molecules with the crystals surface is due to the C=O and CN groups of the pyrrolidone ring of PVP.
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