In situ electrochemical STM study of platinum nanodot arrays on highly oriented pyrolythic graphite prepared by electron beam lithography
作者： A Foelske-Schmitz , A Peitz , VA Guzenko , D Weingarth , GG Scherer
DOI: 10.1016/J.SUSC.2012.07.040
关键词: Electron-beam lithography 、 Graphite 、 Analytical chemistry 、 Platinum 、 Electrode 、 Substrate (electronics) 、 Materials science 、 Highly oriented pyrolytic graphite 、 Nanodot 、 Standard electrode potential
摘要: Abstract Model electrodes consisting of platinum dots with a mean diameter (30 ± 5) nm and heights 3–5 nm upon highly oriented pyrolytic graphite (HOPG) were prepared by electron beam lithography subsequent sputtering. The Pt nanodot arrays stable during scanning tunnelling microscopy (STM) measurements in air sulphuric acid electrolyte, indicating the presence “anchors”, immobilising on HOPG surface. Electrochemical STM was used to visualise potential induced Pt, carbon Pt-influenced corrosion situ 0.5 M under ambient conditions. Potentiostatic hold experiments show that start disappear at electrode potentials E > 1.4 V vs. SHE. With increasing time hole pattern congruent original dot appears basal planes. Corrosion peeling substrate could also be followed . Dissolution accelerated for cycling compared statistics.
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