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Study of ionic liquid immobilization on polyvinyl ferrocene substrates for gas sensor arrays.

Authors
Hou-K-Y; Rehman-A; Zeng-X
Source
Langmuir 2011 Apr; 27(8):5136-5146
NIOSHTIC No.
20039547
Abstract
In this report, the effects of conductive polymer oxidation states and structures on the design and development of ionic liquid (IL)/conductive polymer (CP) composite films for gas sensing are systematically characterized. Four different polyvinyl ferrocene (PVF) films synthesized by varying the conditioning potential (0.7 vs 0.0 V) and the electrolyte are tested for their gas-sensing properties (e.g., sensitivity, selectivity, response time, linearity, and dynamic range against various gas analytes such as dichloromethane, ethanol, natural gas, methane, formaldehyde (37%), and benzene) utilizing the quartz crystal microbalance (QCM) and ATR-FT-IR. The best available film is further studied as a substrate for the immobilization of various ILs that enhanced both the sensitivity and selectivity. Finally, two arrays, each comprising four sensors with the following scheme are developed and characterized for their ability to classify the four target analytes by using linear discriminant analysis: (1) the highest sensitivity PVF film immobilized with four different ILs and (2) the highest sensitivity IL immobilized in four different PVF films. Array 2 is proven to be much better than array 1 in discriminating the analytes, which is very significant in establishing the fact that a diverse set of PVF redox states allow the rational development of a PVF/IL composite-based sensor array in order to analyze complex mixtures utilizing structural differences and the extent of intermolecular interactions.
Keywords
Biological-factors; Biological-systems; Metallic-compounds; Molecular-biology; Oxygen-transport; Quantitative-analysis; Gas-detectors; Gases; Analytical-chemistry; Analytical-instruments
Contact
Xiangqun Zeng, The Department of Chemistry, Oakland University, Rochester, MI 48309
CODEN
LANGD5
CAS No.
75-09-2; 75-08-1; 74-82-8; 50-00-0; 71-43-2
Publication Date
20110419
Document Type
Journal Article
Email Address
zeng@oakland.edu
Funding Type
Grant
Fiscal Year
2011
NTIS Accession No.
NTIS Price
Identifying No.
Grant-Number-R21-OH-009099
Issue of Publication
8
ISSN
0743-7463
Source Name
Langmuir
State
MI
Performing Organization
Oakland University, Rochester, Michigan
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