Fabrication and electrical and humidity-sensing properties of a flexible and stretchable textile humidity sensor

Abstract A novel flexible and stretchable textile impedance-type humidity sensor was fabricated by weaving white cotton fabric to form a substrate with a pair of parallel electrodes that were made of conductive yarns, and then spray-coating the as-woven textile substrate with a copolymer of methyl methacrylate (MMA) and [3-(methacrylamino)propyl] trimethyl ammonium chloride (MAPTAC) (poly-MMA/MAPTAC) to form a humidity-sensing film. The effects of the concentration of poly-MMA-MAPTAC on the sensitivity, flexibility and stretchability of the textile impedance-type humidity sensor were studied. The 10 vol.% poly-MMA/MAPTAC-coated textile impedance-type humidity sensor had very high stretchability, high flexibility, wide working range, high sensitivity, acceptable linearity, low hysteresis, fast response/recovery time and long-term stability over a relative humidity (RH) range of 20–90% RH. The humidity-sensing mechanism of the textile impedance-type humidity sensor was explained using complex impedance spectra. The fast Fourier transform (FFT) was used to discriminate between a textile impedance-type humidity sensor under bending and human breath monitoring.

[1]  Fei Wang,et al.  Modified graphene oxide/Nafion composite humidity sensor and its linear response to the relative humidity , 2017, 2017 IEEE SENSORS.

[2]  Jing Wang,et al.  Humidity sensors based on composite material of nano-BaTiO3 and polymer RMX , 2002 .

[3]  Fulei Chu,et al.  Recent advances in time–frequency analysis methods for machinery fault diagnosis: A review with application examples , 2013 .

[4]  Radoslaw Zimroz,et al.  A procedure for weighted summation of the derivatives of reflection coefficients in adaptive Schur filter with application to fault detection in rolling element bearings , 2013 .

[5]  Christine Kallmayer,et al.  Embroidered Interconnections and Encapsulation for Electronics in Textiles for Wearable Electronics Applications , 2008 .

[6]  Mujie Yang,et al.  Investigations on the ion transport mechanism in conducting polymer films , 2000 .

[7]  Gerhard Tröster,et al.  An electronic nose on flexible substrates integrated into a smart textile , 2012 .

[8]  S. Ruan,et al.  Preparation and electrical properties of humidity sensing films of BaTiO3/polystrene sulfonic sodium , 2003 .

[9]  L. P. Eksperiandova,et al.  Recent trends of ceramic humidity sensors development: A review , 2016 .

[10]  Yoshihiko Sadaoka,et al.  Humidity sensors based on polymer thin films , 1996 .

[11]  G. Tröster,et al.  Feasibility of Printing Woven Humidity and Temperature Sensors for the Integration into Electronic Textiles , 2012 .

[12]  Joseph R. Stetter,et al.  Humidity sensing properties of Nation and sol-gel derived SiO2/Nafion composite thin films , 1997 .

[13]  K. Varahramyan,et al.  Humidity sensor based on ultrathin polyaniline film deposited using layer-by-layer nano-assembly , 2006 .

[14]  Marco Brucale,et al.  Structural and morphological characterizations of MWCNTs hybrid coating onto cotton fabric as potential humidity and temperature wearable sensor , 2017 .

[15]  Thomas Gries,et al.  Preliminary Study on Textile Humidity Sensors , 2015 .

[16]  Y. Li,et al.  Humidity sensors using in situ synthesized sodium polystyrenesulfonate/ZnO nanocomposites. , 2004, Talanta.

[17]  Chengji Zhao,et al.  Novel polymeric humidity sensors based on sulfonated poly (ether ether ketone)s: Influence of sulfonation degree on sensing properties , 2017 .

[18]  Fei Wang,et al.  Differential Structure With Graphene Oxide for Both Humidity and Temperature Sensing , 2017, IEEE Sensors Journal.

[19]  R. Jachowicz,et al.  Humidity sensor printed on textile with use of ink-jet technology , 2012 .

[20]  Juhee Jang,et al.  Cylindrical relative humidity sensor based on poly-vinyl alcohol (PVA) for wearable computing devices with enhanced sensitivity , 2017 .

[21]  G. Troster,et al.  A textile integrated sensor system for monitoring humidity and temperature , 2011, 2011 16th International Solid-State Sensors, Actuators and Microsystems Conference.

[22]  Dermot Diamond,et al.  Advances in wearable chemical sensor design for monitoring biological fluids , 2015 .

[23]  James C. Sturm,et al.  ELECTROTEXTILES: CONCEPTS AND CHALLENGES , 2002 .

[24]  C. Hertleer,et al.  Smart textiles in health: An overview , 2016 .

[25]  Hongwei Zhu,et al.  Recent advances in wearable tactile sensors: Materials, sensing mechanisms, and device performance , 2017 .

[26]  P. Su,et al.  In situ copolymerization of copolymer of methyl methacrylate and [3-(methacrylamino)propyl] trimethyl ammonium chloride on an alumina substrate for humidity sensing , 2005 .

[27]  B. Adhikari,et al.  Polymers in sensor applications , 2004 .

[28]  Giorgio Sberveglieri,et al.  Characterization of porous Al2O3SiO2/Si sensor for low and medium humidity ranges , 1995 .

[29]  Tong Zhang,et al.  Preparation of organic-inorganic hybrid polymers and their humidity sensing properties , 2017 .