Polyaniline nanofiber composites with amines: Novel materials for phosgene detection

Several orders of magnitude of change in resistance are observed upon chemical doping and dedoping of the conducting polymer polyaniline. This large conductivity range can be utilized to make sensitive chemical sensors. Polyaniline, in its nanofiber form, has even greater sensing capabilities due to...

Full description

Saved in:

Bibliographic Details
Published in:	Nano research Vol. 2; no. 2; pp. 135 - 142
Main Authors:	Virji, Shabnam, Kojima, Robert, Fowler, Jesse D., Villanueva, Joey G., Kaner, Richard B., Weiller, Bruce H.
Format:	Journal Article
Language:	English
Published:	Berlin/Heidelberg Springer Berlin Heidelberg 01-02-2009 Springer Nature B.V
Subjects:	Acid resistance Additives Amines Arrays Atomic/Molecular Structure and Spectra Biomedicine Biotechnology Chemical sensors Chemical synthesis Chemistry and Materials Science Composite materials Condensed Matter Physics Conducting polymers Environmental conditions Fibers Gaseous diffusion Materials Science Nanocomposites Nanofibers Nanomaterials Nanostructure Nanotechnology Phosgene Polyanilines Polymers Porous materials Reagents Research Article conducting polymer amines chemical sensor phosgene Polyaniline nanofibers
Online Access:	Get full text
Tags:	Add Tag No Tags, Be the first to tag this record!

Description
Summary:	Several orders of magnitude of change in resistance are observed upon chemical doping and dedoping of the conducting polymer polyaniline. This large conductivity range can be utilized to make sensitive chemical sensors. Polyaniline, in its nanofiber form, has even greater sensing capabilities due to the small fiber diameters, high surface area, and porous nanofiber network that enhances gas diffusion into the fibers. Polyaniline nanofibers have been synthesized using a rapid mixing method and dispersed in water allowing them to be easily modified with water soluble agents, making new composite materials. Polyaniline nanofiber composite materials can be used to enhance detection of analytes that unmodified polyaniline would not otherwise be able to detect. The detection mechanism involves the reaction of an additive with the analyte to generate a strong acid that is easily detected by polyaniline, resulting in orders of magnitude changes in resistance. The reaction of the additive alone with the analyte produces no electrical response, however. In this paper, an array of amine-polyaniline nanofiber composite materials is investigated for the detection of phosgene gas. The influence of environmental conditions such as humidity and temperature are examined and a detection mechanism is presented.
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 ObjectType-Article-2 ObjectType-Feature-1
ISSN:	1998-0124 1998-0000
DOI:	10.1007/s12274-009-9011-1