Preparation and characterization of poly(amic acid)-stabilized silver nanoparticles
来源期刊：中南大学学报(英文版)2013年第6期
论文作者：LI Jun(李俊) FANG Yue-cheng(方悦诚) HE Guo-wen(贺国文) LI Heng-feng(李衡峰)
文章页码：1475 - 1481
Key words：silver nanoparticles; poly(amic acid); ultraviolet-visible spectroscopy; crystallization kinetics
Abstract: Stable and monodispersed silver nanoparticles were produced through a mild, convenient, one-pot method based on the reduction of silver nitrate in the presence of poly(amic acid) (PAA) as a stabilizer. The surface plasma band transition was monitored along with time in the reaction mixture for three sets of experiments by ultraviolet-visible spectroscopy. Analysis of the data with the Avrami equation yielded n exponent with values between 0.5 and 1.5, demonstrating three-dimensional heterogeneous nucleation and diffusion-controlled growth, accompanied by soft impingement effect. XRD and TEM analyses show a softly agglomerated polycrystalline state and a nearly spherical morphology (<50 nm) of nanoparticles. The FT-IR result indicates that the PAA molecular structure could be hardly influenced by the formation of nanoparticles.
LI Jun(李俊)1, FANG Yue-cheng(方悦诚)1, HE Guo-wen(贺国文)1, 2, LI Heng-feng(李衡峰)1
(1. School of Material Science and Engineering, Central South University, Changsha 410083, China;2. College of Chemical and Environmental Engineering, Hunan City University, Yiyang 413000, China)
Abstract:Stable and monodispersed silver nanoparticles were produced through a mild, convenient, one-pot method based on the reduction of silver nitrate in the presence of poly(amic acid) (PAA) as a stabilizer. The surface plasma band transition was monitored along with time in the reaction mixture for three sets of experiments by ultraviolet-visible spectroscopy. Analysis of the data with the Avrami equation yielded n exponent with values between 0.5 and 1.5, demonstrating three-dimensional heterogeneous nucleation and diffusion-controlled growth, accompanied by soft impingement effect. XRD and TEM analyses show a softly agglomerated polycrystalline state and a nearly spherical morphology (<50 nm) of nanoparticles. The FT-IR result indicates that the PAA molecular structure could be hardly influenced by the formation of nanoparticles.
Key words:silver nanoparticles; poly(amic acid); ultraviolet-visible spectroscopy; crystallization kinetics
