Effects of some organic acids as dopants on selected molecular properties affecting electrical conductivity of polypyrole

Date

11-2006

Degree

Bachelor of Science in Chemistry

College

College of Arts and Sciences (CAS)

Adviser/Committee Chair

Ernesto J Del Rosario

Abstract

PARAN, MAYVELYN LLORENTE, University of the Philippines Los Banos. November 2006. Effect of Some Organic Acids as Dopants on Selected Molecular Properties Affecting Electrical Conductivity of Polypyrrole

Adviser: Dr. Ernesto J. del Rosario

Selected physico-chemical properties of polypyrrole (PPy) and its forms doped with organic acids such as acetic acid, benzoic acid, and salicylic acid were calculated using HyperChem software. Small HOMO-LUMO energy gap, large bandwidth, low ionization potential, and high dipole moment were found to be correlated with high electrical conductivity. These were observed for the doped forms of PPy in comparison with the undoped form. This agrees with the experimental electrical conductivity of PPy measured using the four-point probe. The polypyrrole samples were chemically synthesized using ammonim peroxydisulfate (APS) as oxidant with each organic acid as dopant. All the doped forms of PPy have higher electrical conductivity than the undoped form. PPy-salicylate was found to be the most conductive among the doped forms of PPy which agrees with its computed molecular properties. All samples were characterized using IR spectroscopy. The IR absorption peaks corresponding to pyrrole rings and characteristic peaks for the three organic dopants were identified.

Language

English

Location

UPLB Main Library Special Collections Section (USCS)

Call Number

LG 993.5 2006 C4 P37

Document Type

Thesis

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