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机构地区:[1]青岛科技大学材料科学与工程学院,山东青岛266042 [2]南京理工大学材料科学与工程系,江苏南京210094
出 处:《青岛科技大学学报(自然科学版)》2009年第2期143-146,共4页Journal of Qingdao University of Science and Technology:Natural Science Edition
基 金:山东省优秀中青年奖励基金(2008BS09009);教育部"新世纪优秀人才支持计划"项目(NCET-05-0098)
摘 要:以聚乙烯吡咯烷酮(PVP)为保护剂,甲醇为还原剂,V(醇):V(水)=1:1的混合溶液为溶剂,制备了铂、钯单金属胶体和钯/铂双金属胶体,并用透射电镜进行了表征。结果表明,所制得的钯胶体和铂胶体颗粒粒径分别为(3.11±0.83)nm和(3.41±0.46)nm。钯/铂双金属胶体平均粒径大小在2.5~3.5nm之间,其粒径的标准偏差为0.6~0.9nm。双金属胶体会形成以铂原子在中心聚集,而钯原子在表面富集的结构模型。Platinum colloid (PVP-Pt), palladium colloid (PVP-Pd) and palladium-platinum bimetallic colloids (PVP- Pd/Pt) were prepared using poly (N-vinyl-2-pyrrolidone) (PVP) as protective agent, methanol as reducer and methanol/water (1 : 1, V/V) as solvent. The obtained metallic colloids were characterized by TEM. It was observed that the particle size of PVP-Pd and PVP-Pt colloids were (3. 11 ±0. 83) nm and (3.41 ± 0.46) nm respectively. The average diameters of PVP-Pd/Pt bimetallic colloid particles range from 2.5 nm to 3.5 nm. The standard deviations of the bimetallic nanoparticles range from 0.6 nm to 0.9 nm. Platinum atoms were concentrated in the core of the PVP-Pd/ Pt bimetallic colloids, while palladium atoms were concentrated on the surface layer of the alloy clusters.
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