Accession Number:

ADA235603

Title:

EQCM Studies of Film Growth, Redox Cycling, and Charge Trapping of n-Doped and p-Doped Poly(Thiophene).

Descriptive Note:

Technical rept. no. 13, Sep 1990-Jun 1991,

Corporate Author:

WYOMING UNIV LARAMIE DEPT OF CHEMISTRY

Personal Author(s):

• Borjas, Ricardo
• Buttry, Daniel A.

Report Date:

1991-04-29

Pagination or Media Count:

33.0

Abstract:

The electrochemical quartz crystal microbalance EQCM is used to monitor mass changes which accompany the growth, redox cycling, and charge trapping of thin films of polythiophene PT at Au electrodes under potentiodynamic conditions. Mechanical conductance spectra of the EQCMPT composite resonators reveal that the PT films behave as rigid layers, allowing use of the Sauerbrey equation for calculation of quantitative mass changes from the frequency changes recorded with the EQCM. Film growth by oxidation of 2,2- bithiophene appears to proceed by production of soluble, short chain oligomers following oxidation, with precipitation a consequence of both reduction and increasing chain length.

Descriptors:

• *OXIDATION
• *ELECTROCHEMISTRY
• *THIN FILMS
• CONDUCTIVITY
• LAYERS
• GROWTH(GENERAL)
• MASS
• TRAPPING(CHARGED PARTICLES)
• CYCLES
• SPECTRA
• PRECIPITATION
• LENGTH
• CHAINS
• RESONATORS
• EQUATIONS
• RIGIDITY
• OXIDATION REDUCTION REACTIONS
• PRODUCTION
• ELECTRIC CHARGE
• FREQUENCY
• MECHANICAL PROPERTIES

Subject Categories:

• Electrical and Electronic Equipment

Distribution Statement:

APPROVED FOR PUBLIC RELEASE