Synthesis and electrically conductive polymer/inorganic composites: In situ oxidative polymerization/intercalation of conducting polymers in layered hosts

Miscellaneous · Wed Jan 01 00:00:00 EST 1992

OSTI ID:7020388

Wu, C G

The redox intercalation of polyaniline, polypyrrole and polythiophene in V[sub 2]O[sub 5] xerogel is a topotactic reaction which was achieved by reacting aniline, pyrrole and 2,2'-bithiophene with V[sub 2]O[sub 5] xerogel. Upon intercalation, the interlayer spacing expanding from 11.55 [angstrom] to 13.94 [angstrom], 15.20 [angstrom] and 14.70[degrees] for polyaniline/V[sub 2]O[sub 5] polypyrrole/V[sub 2]O[sub 5] and polythiophene/V[sub 2]O[sub 5] respectively. The room temperature conductivity of polymer/V[sub 2]O[sub 5] composites is in the range of 10[sup [minus]4] [approximately] 10[sup 0][Omega][sup [minus]1]cm[sup [minus]1] and decreases with temperature. The charge transport properties of these composities vary significantly from each other. They can be semiconductors or metal-like, with n-type or p-type conductivity depending on the reaction media, polymer/V[sub 2]O[sub 5] ratio and polymer molecular weight. Upon standing in air, the magnetic moment of all polymer/V[sub 2]O[sub 5] composites decreases. Another effect oxygen has on (PANI)[sub x]V[sub 2]O[sub 5]nH[sub 2]O is to cause the intercalated polyaniline chains to oxidatively polymerize to form longer chains. This increased the conductivity. (PANI)[sub x]FeOCl was obtained by reacting FeOCl with excess aniline in acetonitrile at room temperature. The products have interlayer spacing equal to 13.96 [angstrom]. The thermoelectric power of all samples shows p-type semiconductor behavior. Upon sitting in air (aging), two separate processes occurred: the FeOCl is hydrolyzed to [beta]-FeO OH, and polyaniline chains continue to oxidatively polymerize forming longer chains of polymer. Intercalation of polyfuran was achieved by taking advantage of the lower oxidation potentials of terfuran and quaterfuran. Two different products were isolated depending on the reaction conditions. Variable temperature thermopower data of both products show typical p-type semiconductor behavior similar to (PANI)[sub x]FeOCl.

• Research Organization: Michigan State Univ., East Lansing, MI (United States)
• OSTI ID: 7020388
• Resource Relation: Other Information: Thesis (Ph.D.)
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
ANILINE
POLYMERIZATION
POLYMERS
ELECTRIC CONDUCTIVITY
PYRROLES
THIOPHENE
VANADIUM OXIDES
ELECTRIC CONDUCTORS
FURANS
LAYERS
AMINES
AROMATICS
AZOLES
CHALCOGENIDES
CHEMICAL REACTIONS
ELECTRICAL PROPERTIES
HETEROCYCLIC COMPOUNDS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
ORGANIC SULFUR COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
TRANSITION ELEMENT COMPOUNDS
VANADIUM COMPOUNDS
360601* - Other Materials- Preparation & Manufacture
360606 - Other Materials- Physical Properties- (1992-)
400201 - Chemical & Physicochemical Properties