Synthesis and characterization of Au@Pt nanoparticles  

作　　者：ZHAO Dan WU Gang XU Boqing 

机构地区：[1]Innnvative Catalysis Program, Key Lab of Organic Optoelectronics & Molecular Engineering, Department of Chemistry, Tsinghua University, Beijing 100084, China

出　　处：《Chinese Science Bulletin》2005年第17期1846-1848,共3页

基　　金：This work was supported by the National Basic Research Project(Grant No.G2000026408);the National Natural Science Foundation of China(Grant No.20125310).

摘　　要：Aucore-Ptshell (Au@Pt) nanoparticles were syn-thesized at room temperature by reducing K2PtCl6 with hy-drogen in the solution containing Au colloids and polyvi-nylpyrrolidone (PVP). The particles obtained were charac-terized with UV-Vis, TEM and XPS techniques. UV-Vis spectra show that the surface plasmon absorption feature of Au colloids is significantly reduced with increasing the amount of reduced Pt. TEM images that the metals are found always appear as spherical nanoparticles and their sizes grow apparently due to the reduction of PtCl62? ions, indicating that Pt is deposited from solution onto Au particle surface and forms a Pt-layer with uniform thickness. In the XPS spectra, the signals of Au metal decrease due to the re-ductive deposition of Pt on the surface of the Au colloids. UV-Vis and XPS data are consistent in showing that when the amount of Pt in the AuPt colloids is increased to reach an overall atomic ratio of Pt/Au = 2, the Pt deposits form a shell covering completely the surface of Au particles, demonstrat-ing the core-shell structure of the synthesized AuPt particles.Aucore-Ptshell （Au@Pt） nanoparticles were synthesized at room temperature by reducing K2PtCl6 with hydrogen in the solution containing Au colloids and polyvinylpyrrolidone （PVP）. The particles obtained were characterized with UV-Vis, TEM and XPS techniques. UV-Vis spectra show that the surface plasmon absorption feature of Au colloids is significantly reduced with increasing the amount of reduced Pt. TEM images that the metals are found always appear as spherical nanoparticles and their sizes grow apparently due to the reduction of PtCl6^2- ions, indicating that Pt is deposited from solution onto Au particle surface and forms a Pt-layer with uniform thickness. In the XPS spectra, the signals of Au metal decrease due to the reductive deposition of Pt on the surface of the Au colloids. UV-Vis and XPS data are consistent in showing that when the amount of Pt in the AuPt colloids is increased to reach an overall atomic ratio of Pt/Au=2, the Pt deposits form a shell covering completely the surface of Au particles, demonstrating the core-shell structure of the synthesized AuPt particles.

关 键 词：铂金 纳米粒子 空间温度 光谱吸收 金属结构 金属胶体 

分 类 号：O614[理学—无机化学]