NOTICE: Due to a lapse in annual appropriations, most of this website is not being updated. Learn more.
Form submissions will still be accepted but will not receive responses at this time. Sections of this site for programs using non-appropriated funds (such as NVLAP) or those that are excepted from the shutdown (such as CHIPS and NVD) will continue to be updated.
An official website of the United States government
Here’s how you know
Official websites use .gov
A .gov website belongs to an official government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.
Effect of Morphology on the Response of Polyaniline-Based Conductometric Gas Sensors: Nanofibers vs. Thin Films
Published
Author(s)
Guofeng Li, C Martinez, J Janata, J A. Smith, M Josowicz, Stephen Semancik
Abstract
Mixtures of methanol with increasing fractions of formic acid were used to progressively transform the morphology of polyaniline starting from nanofibers to compact conventional films. It was demonstrated that the methanol/formic acid mixture could be used as a viable solvent system for nanostructured polyaniline to achieve sufficient processability while to great extent maintaining its microstructure. In addition, the effects of morphology on the response of polyaniline-based conductometric sensors to neutral gas molecules were examined. Although the nanofiber films demonstrated faster responses, they were found to have lower sensitivity than conventional thin films. It appears that creating high surface area nanofibril structures in polyaniline film does not effectively enhance sensor sensitivity due to the relatively open structure of polymeric materials and the adverse contribution from the interfibrillar contact resistance associated with nanofiber films.
Citation
Electrochemical and Solid State Letters
Volume
7
Issue
No. 10
Pub Type
Journals
Keywords
chemical sensor, morphology, polyaniline
Citation
Li, G.
, Martinez, C.
, Janata, J.
, Smith, J.
, Josowicz, M.
and Semancik, S.
(2004),
Effect of Morphology on the Response of Polyaniline-Based Conductometric Gas Sensors: Nanofibers vs. Thin Films, Electrochemical and Solid State Letters
(Accessed October 7, 2025)