Langmuir-Blodgett films of 3-alkyl pyrroles studied by STM. Technical report. [STM (scanning tunelling microscopy)]
By applying the Langmuir-Blodgett (LB) technique mono- and multilayers of monomers and their polymers were built up on conductive solid substrates for studies with scanning tunneling microscopy (STM). Monomers, mixed monomers and polymer monolayers of 3-alkyl pyrroles were transferred onto freshly cleaved molybdenum disulfide (MoS2) and highly oriented pyrolytic graphite (HOPG). High-quality images of the mono- and multilayers could be observed by STM after annealing. Monolayers of monomer were highly ordered showing orientational and positional correlation of alkyl side chains. Mixtures of pyrroles with different side chain lengths showed phase separation. Polymer monolayers showed high side chain orientation more orthogonal to the surface. From the structures observed on solid substrates (gas-solid interface) conclusions are drawn for the polymerization process and the packing of molecules on the Langmuir-trough (at the gas interface).
- Research Organization:
- Florida Univ., Gainesville, FL (United States). Dept. of Chemistry
- OSTI ID:
- 5348070
- Report Number(s):
- AD-A-274333/4/XAB; TR--25; CNN: N00014-91-J-1655
- Country of Publication:
- United States
- Language:
- English
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360602 -- Other Materials-- Structure & Phase Studies
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ALKYL RADICALS
AZOLES
CHEMICAL REACTIONS
FILMS
HETEROCYCLIC COMPOUNDS
MICROSCOPY
MICROSTRUCTURE
MOLECULAR STRUCTURE
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
POLYMERIZATION
PYRROLES
RADICALS
THIN FILMS
TUNNEL EFFECT