Growth kinetics of gold nanocrystals: A combined small-angle X-ray scattering and calorimetric study

被引：50

作者：

Biswas, Kanishka ^{[1
,2
,3
]}

Varghese, Neenu ^{[1
,2
]}

Rao, C. N. R. ^{[1
,2
,3
]}

机构：

[1] Indian Inst Sci, Jawaharlal Nehru Ctr Adv Sci Res, DST Nanosci Unit, Chem & Phys Mat Unit, Bangalore 560064, Karnataka, India

[2] Indian Inst Sci, Jawaharlal Nehru Ctr Adv Sci Res, CSIR Ctr Excellence Chem, Bangalore 560064, Karnataka, India

[3] Indian Inst Sci, Solid State & Struct Chem Unit, Bangalore 560012, Karnataka, India

来源：

SMALL | 2008年 / 4卷 / 05期

关键词：

growth kinetics; gold nanocrystals; calorimetry; sigmoidal growth; X-ray scattering;

D O I：

10.1002/smll.200700937

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The growth of gold nanocrystals prepared by the reduction of tetra-chloroauric acid by tetrakis(hydroxymethyl)phosphonium chloride, which allows slow reduction, is investigated by small-angle X-ray scattering and isothermal titration calorimetry in combination with transmission electron microscopy. The growth of the nanocrystals does not follow the diffusion-limited Ostwald ripening but instead follows a sigmoidal rate curve. The activation energy obtained from the temperature-dependent growth study is very small. The heat change associated with the growth is determined for the first time as approximately 10 kcal mol(-1) per 1 nm increase in the nanocrystals' diameter.

引用

页码：649 / 655

页数：7

共 25 条

[1] Probing in situ the nucleation and growth of gold nanoparticles by small-angle x-ray scattering [J].