A Facile Route of Gold Nanoparticle Synthesis and Surface Modification Using Amino-Terminated Poly(ethylene oxide)-Poly(propylene oxide) Block Copolymers

作者：Sakai Toshio^*; Ishigaki Mai; Okada Tomohiko; Mishima Shozi

来源：Journal of Nanoscience and Nanotechnology, 2010, 10(2): 919-926.

DOI：10.1166/jnn.2010.1899

• SURFONAMINE (R)
• Amino-Terminated Poly(ethylene oxide)-Poly(propylene oxide) Block Copolymers
• Gold Nanoparticles
• Autoreduction
• Surface Modification

We report here a facile synthetic method and surface modification of gold nanoparticles using amino-terminated poly(ethylene oxide)-poly(propylene oxide) block copolymers (CH(3)-[OCH(2)CH(2)](x)-[OCH(2)CH(CH(3))](y)-NH(2); EO(x)PO(y)NH(2)) (SURFONAMINE (R)) as media, reducing agents, stabilizing agents and surface-modifying agents. Gold nanoparticles were synthesized through autoreduction of hydrogen tetrachloroaureate(III) hydrate (HAuCl(4)center dot 3H(2)O) by SURFONAMINE (R) as media and reducing agents at ambient conditions (similar to 25 degrees C). The AuCl(4)(-) reduction and gold nanoparticle formation were promoted by SURFONAMINE (R) with longer PEO segment and heating. The enhanced-activity of SURFONAMINE (R) for AuCl(4)(-) reduction contributed to particle growth due to the AuCl(4)(-) reduction by SURFONAMINE (R) anchored on gold nanoparticles. Furthermore, amphiphilic property of the gold nanoparticle surface was controlled in terms of EO/PO unit ratio of SURFONAMINE (R). For example, gold nanoparticles synthesized in SURFONAMINE (R) L-207 (EO(33)PO(10)NH(2)) homogeneously mixed with water but not with cyclohexane. On the other hand, gold nanoparticles synthesized in SURFONAMINE (R) B-200 (EO(6)PO(29)NH(2)) were miscible with cylcohexane while immiscible with water.

• 出版日期2010-2