Double layer micellar stabilization of gold nanocrystals by greener ionic liquid 1-butyl-3-methylimidazolium lauryl sulfate

作者：Obliosca Judy M; Arellano Ian Harvey J^*; Huang Michael H; Arco Susan D

来源：Materials Letters, 2010, 64(9): 1109-1112.

DOI：10.1016/j.matlet.2010.02.029

• Crystal growth
• Nanoparticle
• Ionic liquid
• Micelle

We report the first synthesis of anisotropic gold nanocrystals (AuNC) prepared by a seeding approach using the greener ionic liquid, 1-butyl-3-methylimidazolium lauryl sulfate, [BMIM] [C(12)H(25)OSO(3)]. Crystal growth was successfully achieved by successive addition of growth solution containing HAuCl(4) and ascorbic acid to 2.5-nm Au seeds. These nanocrystals were stabilized by the ionic liquid via a two layer micellar formation. SEM and TEM results showed Au nanocrystals with particle sizes ranging from 20 to 50 nm. Selected-area electron diffraction (SAED) and PXRD pattern gave indices that correspond to Au nanocrystals. Direct addition of ionic liquid to Au seeds in 3:1 volume ratio afforded the formation of Au nanoparticles. TEM image and UV-vis data revealed the formation of 20-50 nm Au nanocrystals. These results show that the greener ionic liquid, [BMIM] [C(12)H(25)OSO(3)], is a suitable reaction medium for the direct synthesis of larger Au nanoparticles from Au seeds.

• 出版日期2010-5-15
• 单位清华大学