VISUALIZATION OF SURFACTANTS ON NANOSTRUCTURED PALLADIUM CLUSTERS BY A COMBINATION OF STM AND HIGH-RESOLUTION TEM

被引：313

作者：

REETZ, MT ^{[1
]}

HELBIG, W ^{[1
]}

QUAISER, SA ^{[1
]}

STIMMING, U ^{[1
]}

BREUER, N ^{[1
]}

VOGEL, R ^{[1
]}

机构：

[1] FORSCHUNGSZENTRUM JULICH, FORSCHUNGSZENTRUM, INST ENERGIEVERFAHRENSTECHN, D-52424 JULICH, GERMANY

来源：

SCIENCE | 1995年 / 267卷 / 5196期

关键词：

D O I：

10.1126/science.267.5196.367

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Scanning tunneling microscopy (STM) and high-resolution transmission electron microscopy (TEM) have been used to determine the dimensions of a series of palladium clusters stabilized by tetraalkylammonium salts. Electrochemically prepared colloids were used in which the average diameter of the inner metal core was varied between 2 and 4 nano-meters, and the size of the ammonium ions was adjusted in the series N-+(n-C4H9)(4) < N-+(n-C8H17)(4) < N-+(n-C18H37)(4). The difference between the mean diameter determined by STM and that measured by TEM allows the determination of the thickness of the protective surfactant layer. On the basis of these studies, a model of the geometric properties of ammonium-stabilized palladium clusters has been proposed. Suggestions for the mechanism of the STM imaging processes are also made.

引用

页码：367 / 369

页数：3

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