Wang Suhua, Sim Wee-Sun
Department of Chemistry, National University of Singapore, Kent Ridge, Singapore 119260, Singapore.
Langmuir. 2006 Aug 29;22(18):7861-6. doi: 10.1021/la060784f.
A two-step surface functionalization approach has been used to encase Au nanoparticles in monolayer organometallic Ru-complex shells by the reaction of an intermediate surface-bound mercaptopropanoic acid capping species with Ru dodecacarbonyl (Ru3(CO)12) clusters. Vibrational (infrared and Raman) spectroscopy shows that insertion of carboxylate groups into the Ru clusters results in their fragmentation and the formation of a shell of Ru dicarbonyl carboxylate oligomers that remain attached to the Au nanoparticles through the original Au-alkanethiolate bonds. The structural integrity of the metallic nanoparticulate Au cores has been verified by X-ray photoelectron spectroscopy, X-ray diffraction, and transmission electron microscopy. The organometallic Ru-complex shell may be decomposed thermally to eliminate the mercaptopropanoate and carbonyl groups and leave a mixed phase of Au and RuO2.
一种两步表面功能化方法已被用于通过中间体表面结合的巯基丙酸封端物种与十二羰基钌（Ru₃(CO)₁₂）簇的反应，将金纳米颗粒包裹在单层有机金属钌络合物壳中。振动（红外和拉曼）光谱表明，羧酸盐基团插入钌簇中会导致其碎片化，并形成一层二羰基羧酸盐钌低聚物壳，该壳通过原始的金 - 硫醇盐键保持附着在金纳米颗粒上。金属纳米颗粒金核的结构完整性已通过X射线光电子能谱、X射线衍射和透射电子显微镜得到验证。有机金属钌络合物壳可以通过热分解消除巯基丙酸酯和羰基基团，留下金和二氧化钌的混合相。
