Observation and Manipulation of Polymers by Scanning Tunneling and Atomic Force Microscopy
STANFORD UNIV CA DEPT OF CHEMICAL ENGINEERING
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The properties of monolayer films of organic materials are important for a variety of technologies. We have employed the STM and AFM to study Langmuir-Blodgett films of a variety of polymers on substrates of graphite, molybdenum sulfate, and gold 111 on mica. The polymers were polyoctadecyl acrylate PODA, atactic and syndiotactic polymethyl methacrylate PMMA and poly2-methyl 1-pentene sulfone PMPS. One striking feature was the degree of order observed a second was the morphological difference between films of submonolayer thickness long thin fibrils and those of at least monolayer thickness lumpy structures arranged in domains. By pulsing the STM bias voltage to values in excess of 4 V, we were able to bring about local modification of the polymer morphology.
- Industrial Chemistry and Chemical Processing
- Physical Chemistry
- Polymer Chemistry