Controlled growth of silver nanoparticles in a hydrothermal process--颗粒学报PARTICUOLOGY

Zou, J., Xu, Y., Hou, B., Wu, D., & Sun, Y. (2007). Controlled growth of silver nanoparticles in a hydrothermal process. China Particuology, 5(3), 206–212. https://doi.org/10.1016/j.cpart.2007.03.006

Controlled growth of silver nanoparticles in a hydrothermal process

Juan Zou ^a b, Yao Xu ^c *, Bo Hou ^c, Dong Wu ^c, Yuhan Sun ^c

a State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, China
b Graduate School of the Chinese Academy of Sciences, Beijing 100049, China
c CAS Key Laboratory of Carbon Materials, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, China

10.1016/j.cpart.2007.03.006

Volume 5, Issue 3, June 2007, Pages 206-212

Received 21 November 2006, Accepted 17 March 2007, Available online 6 June 2007.

E-mail: xuyao@sxicc.ac.cn

Highlights

Abstract

A two-step synthesis was used to control the shape of silver nanoparticles. First, a few spherical silver nanoparticles, ∼10 nm in size, were prepared via reduction of Ag+ ions in aqueous Ag(NH3)₂NO₃ by poly(N-vinyl-2-pyrrolidone) (PVP). Then, in a subsequent hydrothermal treatment, the remaining Ag⁺ ions were reduced by PVP into polyhedral nanoparticles, or larger spherical nanoparticles formed from the small spherical seed silver nanoparticles in the first step. The morphology and size of the resultant particles depend on the hydrothermal temperature, PVP/Ag molar ratio and concentration of Ag⁺ ions. By using UV–visible spectroscopy (UV–vis), transmission electron microscopy (TEM) and powder X-ray diffraction (XRD), the possible growth mechanism of the silver nanoparticles was discussed.

Graphical abstract

Keywords

Silver nanoparticles; Hydrothermal process; Morphology-evolvement; Nanoplates

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