NDLI: Nanoengineering Polyaniline for Advanced Chemosensing Applications

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Haynes, A. Gouma, P.
Copyright Year	2009
Abstract	The focus of this study is the development of polyaniline based hybrid systems for selective room temperature detection of NO2. The electrospinning technique has been employed to produce highly dispersed nanocomposites of leucoemeraldine base polyaniline (LEB-PANI) with cellulose acetate (CA) as a secondary component. The nanocomposites exhibit sensitivity and selectivity to NO2 down to 1 ppm with response time of 70s and recovery time of 155s. Spectroscopic analyses of the nanocomposites reveal that the molecular interactions between cellulose acetate and LEB-PANI yields enhanced sensitivity and selectivity to NO2. DC electrical resistance measurements of the composite during exposure to the analyte suggest that the response mechanism has some dependency on the humidity level in the gas chamber. This is found to be partly attributed to the byproduct of hydrolyzed CA: acetic acid. Infrared spectroscopy reveals that the acetate ions from the acid and polymer transforms base groups of LEB-PANI to higher oxidized states and affix to quinoid, benzenoid, and imine groups along polyaniline’s chain. These sites operate as additional reactions sites along the polymer backbone for increased ion mobility and aid in retaining the sensor’s stability and selectivity under varying gas atmospheres. This paper details the results from sensing experimentation and classical characterization techniques in an effort to develop a paradigm for chemical sensing with CA-PANI nanocomposites.
Starting Page	829
Ending Page	838
Page Count	10
File Format	PDF
ISBN	9780791843857
DOI	10.1115/IMECE2009-10310
e-ISBN	9780791838631
Volume Number	Volume 12: Micro and Nano Systems, Parts A and B
Conference Proceedings	ASME 2009 International Mechanical Engineering Congress and Exposition
Language	English
Publisher Date	2009-11-13
Publisher Place	Lake Buena Vista, Florida, USA
Access Restriction	Subscribed
Subject Keyword	Chain Infrared spectroscopy Spectroscopy Temperature Stability Ionic mobility Electrical resistance Electrospinning Ions Nanoengineering Composite materials Nanocomposites Polymers
Content Type	Text
Resource Type	Article

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