Size control over spherical silver nanoparticles by ascorbic acid reduction
Size control over spherical silver nanoparticles by ascorbic acid reduction
复制标题
通过抗坏血酸还原控制球形银纳米粒子的尺寸
DOI：
10.1016/j.colsurfa.2010.10.013
复制
发表时间：
2010-12-03
影响因子：
5.2
通讯作者：
Yang, Wensheng
中科院分区：
文献类型：
--
作者：
Qin, Yaqiong;Ji, Xiaohui;Yang, Wensheng
在30℃水浴中，以抗坏血酸为还原剂，柠檬酸盐为稳定剂合成了准球形银纳米粒子。当反应体系的pH值从6.0升高到10.5时，银纳米粒子的平均尺寸从73纳米减小到31纳米。定量分析表明，由于抗坏血酸活性的增加，在较高的pH值下银前驱体的还原反应得到促进。因此，只需改变反应体系的pH值，就可以调节银纳米粒子的核数量，进而调节其尺寸。此外，将纳米粒子在100℃下加热2小时以促进粒子内熟化后，纳米粒子的形状变得更接近球形。（C）2010爱思唯尔有限公司。版权所有。
Quasi-spherical silver nanoparticles were synthesized by using ascorbic acid as reductant and citrate as stabilizer in a 30 degrees C water bath. Average size of the silver nanoparticles decreased from 73 nm to 31 nm as pH of the reaction system increased from 6.0 to 10.5. Quantitative analyses indicated that reduction of the silver precursor was promoted at elevated pH attributed to increased activity of ascorbic acid. As a result, number of the nucleus and thus the size of the silver nanoparticles were tunable by simply changing pH of the reaction system. Moreover, the shape of the nanoparticles became more spherical-like after being heated at 100 degrees C for 2 h to facilitate the intraparticle ripening. (C) 2010 Elsevier B.V. All rights reserved.