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Individually Addressable Suspended Conducting‐Polymer Wires in a Chemiresistive Gas Sensor
Author(s) -
Chang Won Suk,
Kim Jung Hyun,
Kim Daeho,
Cho Sung Ho,
Kwon Seol Seung
Publication year - 2014
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.201400220
Subject(s) - pedot:pss , materials science , conductive polymer , detection limit , polymer , transducer , lithography , acetone , signal (programming language) , nanotechnology , optoelectronics , composite material , polymer chemistry , chemistry , acoustics , organic chemistry , chromatography , computer science , programming language , physics
An effective method is described for producing poly(3,4‐ethylenedioxythiophene) poly(styrenesulfonate) (PEDOT:PSS) arched microwires, which are used as transducers in chemiresistive gas sensors. Three‐dimensional arched wires with diameters of 0.8, 1.2, 2.5, and 10 μm are individually fabricated by using a simple, inexpensive fountain‐pen lithography technique. The wires show superior stretchable behavior under omnidirectional strain of ca. 120%. A gas sensor assembled with the PEDOT:PSS arched wires exhibits linear responses to the concentrations of different vapor gases, such as ethanol, acetone, and methanol, at room temperature. The signal‐to‐noise ratio in the sensing response, which influences the detection limit, is enhanced by increasing the number of wires with a larger surface‐to‐volume ratio in parallel to increasing the signal level and diminishing the baseline noise in the wire transducers.