Microwave irradiation synthesis and characterization of hydrophobic gold nanoparticles of pine needle-like
1. College of Chemistry. and Chemical Engineering, Yangzhou University, Yangzhou, Jiangsu 225002, China; 2. Huanghai School Yancheng Normal College, Yancheng, Jiangsu 224002, China）
Abstract：The octadecylamine-capped gold nanoparticles with different morphologies such as spherical and pine needle-like were successfully synthesized by using formic acid as a reducing agent in oetadecylamine （ C 18 NH2 ）/n - butanol/n - heptane/formic acid/HAuCl4- 4 H2O W/O microemulsion system through microwave dielectric heating. The C18NH2 -stabilized gold nanoparticles were characterized by UV- vis, TEM, XRD and CA （contact angle） , respectively. The effects of molar ratio of C18NH2 to HAuC14 and the formic acid amount on the shape and size of gold nanopartieles were also explored. The experimental results showed that the size of nanoparticles gradually increased with the decrease of molar ratio to C18 NH2 to HAuC14, while the morphologies of particles gradually changed from spherical to pine needle-like. When the molar ratio of Cl8 NH2 to HAuC14 was fixed, the morphologies of gold nanoparticles also changed from spherical to pine needle-like with the increase of formic acid.
2010, Vol. 31 
