Polyaniline nanofiber humidity sensor prepared by electrospinning

Abstract Polyaniline (PANi) nanofiber humidity sensors were prepared by electrospinning (ES) from the N,N-dimethylformamide solution of PANi, poly(vinyl butyral) (PVB) and poly(ethylene oxide) (PEO). Morphologies of the electrospun nanofibers prepared under different ES conditions were observed by scanning electron microscopy. Formation of beads in the nanofibers was found to greatly affect their adhesion to the substrates and the nanostructures. By modulating the composition of ES solution, PANi nanofibers with beads not only showed good adhesion to the electrode and thus good electrical contact, but also maintained relatively high specific surface area. Furthermore, hydrophilicity of the nanofibers was modified by adjusting the ratio of PVB to PEO in the ES solution, which had an effect on their sensing properties. Humidity response of the nanofiber sensors was investigated by measuring their impedance at different humidity levels at room temperature. The nanofiber sensors revealed much higher sensitivity than their film counterparts (impedance changing for three orders of magnitude from 20% to 90%RH). In addition, they were featured with good sensing linearity, fast response (t90% of ∼8 s and 6 s for adsorption and desorption, respectively), small hysteresis (∼1%RH) and good repeatability.

[1]  Il-Doo Kim,et al.  Nanostructured metal oxide gas sensors prepared by electrospinning , 2011 .

[2]  Yulin Deng,et al.  Ultrasensitive NH3 Gas Sensor from Polyaniline Nanograin Enchased TiO2 Fibers , 2010 .

[3]  D. Y. Kim,et al.  Ultrasensitive chemiresistors based on electrospun TiO2 nanofibers. , 2006, Nano letters.

[4]  Xuejun Zheng,et al.  Influence of crystallographic structure on the humidity sensing properties of KCl-doped TiO2 nanofibers , 2009 .

[5]  Charles M. Lieber,et al.  Nanoscale Science and Technology: Building a Big Future from Small Things , 2003 .

[6]  Yang Li,et al.  A resistive-type humidity sensor based on crosslinked polyelectrolyte prepared by UV irradiation , 2009 .

[7]  M. Gong,et al.  Preparation of water-durable humidity sensor by attachment of polyelectrolyte membrane to electrode substrate by photochemical crosslinking reaction , 2010 .

[8]  Sudha V. Bhoraskar,et al.  Humidity sensing with weak acid-doped polyaniline and its composites , 2003 .

[9]  Feng Liu,et al.  A simple fabrication of electrospun nanofiber sensing materials based on fluorophore-doped polymer , 2009 .

[10]  Jun Kameoka,et al.  Polymeric Nanowire Chemical Sensor , 2004 .

[11]  Yang Li,et al.  Gas sensing properties of a composite composed of electrospun poly(methyl methacrylate) nanofibers and in situ polymerized polyaniline , 2008 .

[12]  Bin Ding,et al.  Electrospun nanomaterials for ultrasensitive sensors , 2010, Materials Today.

[13]  Jong-Man Kim,et al.  Detection of adulterated gasoline using colorimetric organic microfibers , 2011 .

[14]  Peng Li,et al.  Electrospun nanofibers of polymer composite as a promising humidity sensitive material , 2009 .

[15]  V. Rao,et al.  Chitin–polyaniline blend as humidity sensor , 2010 .

[16]  Younan Xia,et al.  Electrospinning of Nanofibers: Reinventing the Wheel? , 2004 .

[17]  Minhee Yun,et al.  Highly sensitive single polyaniline nanowire biosensor for the detection of immunoglobulin G and myoglobin. , 2011, Biosensors & bioelectronics.

[18]  Jincheng Ding,et al.  Preparation and characterization of PSSA/PVA catalytic membrane for biodiesel production , 2010 .

[19]  W. Wlodarski,et al.  Hydrogen gas sensor based on highly ordered polyaniline nanofibers , 2009 .

[20]  A. T. Johnson,et al.  Electrical response of electrospun PEDOT-PSSA nanofibers to organic and inorganic gases , 2011 .

[21]  Dan Du,et al.  Acetylcholinesterase biosensor design based on carbon nanotube-encapsulated polypyrrole and polyaniline copolymer for amperometric detection of organophosphates. , 2010, Biosensors & bioelectronics.

[22]  J. Lee,et al.  PROGRESS IN PREPARATION, PROCESSING AND APPLICATIONS OF POLYANILINE , 2009 .

[23]  Liming Dai,et al.  Electrospun polymer nanofiber sensors , 2005 .

[24]  Jordi Riu,et al.  Nanosensors in environmental analysis. , 2006, Talanta.

[25]  Canhui Lu,et al.  Composite nanofibers of conducting polymers and hydrophobic insulating polymers: Preparation and sensing applications , 2009 .

[26]  Darrell H. Reneker,et al.  Beaded nanofibers formed during electrospinning , 1999 .