Hydrogen Reactivity of Palladium Nanoparticles Coated with Mixed Monolayers of Alkyl Thiols and Alkyl Amines for Sensing and Catalysis Applications
作者:Monica Moreno、Francisco J. Ibañez、Jacek B. Jasinski、Francis P. Zamborini
DOI:10.1021/ja108378x
日期:2011.3.30
Palladium monolayer-protected clusters (MPCs) coated with octylamines (C8NH(2)), hexanethiolates (C6S), and mixed monolayers of C8NH(2) and C6S exhibit significantly different reactivities with hydrogen gas, depending on the relative amounts of the two ligands coating the Pd nanoparticle surface, as determined by UV-vis spectroscopy of Pd MPCs in solution and electronic measurements of films of Pd
涂有辛胺 (C8NH(2))、己硫醇 (C6S) 和 C8NH(2) 和 C6S 的混合单层的钯单层保护簇 (MPC) 与氢气的反应性显着不同,这取决于两种配体的相对数量通过溶液中 Pd MPCs 的紫外-可见光谱和 Pd MPCs 薄膜的电子测量作为暴露于氢的时间的函数来涂覆 Pd 纳米颗粒表面。~3.0 nm 直径 Pd MPC 的平均估计成分为 Pd(919)(C6S)(192) 或 Pd(919)(C8NH(2))(177-x)(C6S)(x),其中 x 是变化的通过合成纯 C8NH(2) Pd MPC 和随后与不同量的 C6SH 进行液相位置交换,将其变为 0、3、10、16、32 或 81。当 x = 0-10 时,Pd MPCs 与 H(2) 发生强烈反应,导致溶液中颗粒聚集,薄膜形态发生巨大的不可逆变化,同时薄膜电导率增加 2-5 个数量级。Pd(919)(C6S)(192)