Synthesis of silver nanoparticles with thermo-controllable optical properties

被引:3
作者
Sun, Youyi [1 ,2 ]
Tian, Ye [2 ]
He, Ming [2 ]
Fan, Daining [1 ]
Li, Faxing [1 ]
Zhang, Qijing [3 ,4 ]
机构
[1] Peking Univ, Coll Engn, Beijing 100871, Peoples R China
[2] N Univ China, Res Ctr Engn Technol Polymer Composites Shanxi Pr, Taiyuan 030051, Peoples R China
[3] Univ Sci & Technol China, Struct Res Lab, Hefei 230026, Anhui, Peoples R China
[4] Univ Sci & Technol China, Dept Polymer Sci & Engn, Hefei 230026, Anhui, Peoples R China
来源
MICRO & NANO LETTERS | 2012年 / 7卷 / 02期
基金
中国国家自然科学基金;
关键词
G-PEO COPOLYMER; GOLD NANOPARTICLES; RADICAL POLYMERIZATION; SURFACE; MICROGELS; CHAINS; PHASE; FILMS;
D O I
10.1049/mnl.2012.0008
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
Silver nanoparticles (SNPs) coated with a thermoresponsive polymer, poly(N-isopropylacrylamide)-g-poly-(ethylene oxide) (PNIPAM-gPEO), have been prepared by the reduction of silver ions with NaH4B in aqueous solutions. The obtained SNPs were very stable at room temperature because of the extended coil conformation of the PNIPAM-g-PEO chain. At higher temperatures (such as 40 degrees C) above the phase transition of PNIPAM-g-PEO, only minute aggregation between the SNPs was observed, indicating that the PEO chains still retained the ability to stabilise the SNPs. Moreover, the thermoresponsive properties of SNPs coated with PNIPAM-g-PEO were further investigated as a function of the temperature by UV-vis spectroscopy, dynamic light scattering and transmission electron microscopy. The switchable optical and size response of the SNPs triggered by temperature change was observed. The absorbing peak and size of the SNPs was blue shift from 395.0 to 382.5 nm and increased from 29.4 to 33.5 nm at elevating the temperature from 25 to 40 degrees C, respectively. The result was attributed to the phase transition of PNIPAM-g-PEO adsorbing on the surface of the SNPs as a function of temperature.
引用
收藏
页码:174 / 177
页数:4
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