Abstract
The resolution of scanning surface potential microscopy (SSPM) is mainly limited bynon-local electrostatic interactions due to the finite probe size. Here we present highresolution surface potential imaging with ultrasharp and high aspect ratio carbon nanotube(CNT) atomic force microscopy (AFM) probes fabricated via dielectrophoresis.Enhancement of surface potential contrast by several factors is reported for integratedcircuit structures and purple membrane fragments for these CNT AFM probesas compared to conventional probes. In particular, ultrahigh lateral resolution(∼2 nm) surface potential images of self-assembled bacteriorhodopsin proteins are reported atambient conditions, with the implication of label-free protein detection by SSPMtechniques.
Published Version
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