Effect of different acids on the electrical response of polyaniline

Date

10-2010

Degree

Bachelor of Science in Applied Physics

College

College of Arts and Sciences (CAS)

Adviser/Committee Chair

Marvin U. Herrera

Abstract

A solution of polyaniline emeraldine salt (PAni-ES) doped with camphorsulfonic acid (CSA) blended with polystyrene (PS) in chloroform was electrospun to produce mats of fibers. Some of these mats were dedoped with ammonia, and doped again with hydrochloric acid (HCI) and sulfuric acid (H2504). The electrical response of doped polyaniline-emeraldine mats to carbon monoxide was monitored using a Wheatstone bridge circuit. The potential difference across the bridge was measured while Pani-ES was exposed to CO. It was observed that all fiber mats had a decrease in resistance. PAni doped with HCl exhibited the highest electrical response with a voltage reading of 29.05 mV across the bridge; while PAni-H2SO4 fibers had 19.33 mV response and PAni-CSA fibers had 6.87 mV. The electrical response of PAni fibrous mats was found to have an inverse relationship with the molecular weight of the dopant acids. This implies that the size of the dopant acid deters the interaction of CO with the amine nitrogen of PAni because larger dopants decrease the permeability of polyaniline.

Language

English

Location

UPLB Main Library Special Collections Section (USCS)

Call Number

Thesis

Document Type

Thesis

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