ISSN:
1089-7623
Source:
AIP Digital Archive
Topics:
Physics
,
Electrical Engineering, Measurement and Control Technology
Notes:
A flow injection scanning tunneling microscopy (FISTM) system is described and characterized which permits observation of surface chemical processes. This modification to a standard scanning tunneling microscope consists of a peristaltic pump attached via a manual HPLC-type flow injector to a constant-volume sample cell. Images recorded as fluids continuously exchange in the cell are reported. Evidence supports that analytes are transported into the tip region through a stagnant fluid domain by diffusion from the adjacent, circulating bulk solution. Electrochemical measurements of the exposed tip surface area and rates of diffusion of analytes are presented and interpreted. Erosion of contaminants on a gold surface exposed to hydrogen peroxide was observed using FISTM, and these results are presented. © 1995 American Institute of Physics.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.1145362
