4 June 1993 Molecular charge mapping with electrostatic force microscope
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Proceedings Volume 1855, Scanning Probe Microscopies II; (1993) https://doi.org/10.1117/12.146383
Event: OE/LASE'93: Optics, Electro-Optics, and Laser Applications in Scienceand Engineering, 1993, Los Angeles, CA, United States
We are attempting charge mapping and potentiometry on biological and molecular systems using a modified Atomic Force Microscope (AFM)--Electrostatic Force Microscope (EFM). With an interferometric detection system, we have obtained potentiometric sensitivity better than 0.1 mV and spatial resolution of about 200 angstroms. The images of red blood cells in air clearly show surface potential variation, independent of topography. We imaged FEP ((poly)tetrafluororethylene -co- hexafluoropropylene) films lithographically patterned with APS (poly(aminopropyl)siloxane). We have been able to positively identify the modified regions (APS) from the unmodified regions (FEP) using charge information. The charge density we estimated on the unmodified FEP regions of our samples is about 10-9C/cm2.
© (1993) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Yaojian Leng, Yaojian Leng, Clayton C. Williams, Clayton C. Williams, } "Molecular charge mapping with electrostatic force microscope", Proc. SPIE 1855, Scanning Probe Microscopies II, (4 June 1993); doi: 10.1117/12.146383; https://doi.org/10.1117/12.146383

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