An electronic nose on flexible substrates integrated into a smart textile

Abstract Fabrication costs of gas sensors are decreasing due to the use of low cost flexible polymer substrates and solution based fabrication processes. This development creates new application possibilities for gas sensors and allows the installation into objects of our daily life, such as textiles. Challenges with the integration of electronic components on flexible substrates arise mainly due to strain introduced by bending the substrate. This plays an important role especially during weaving as strong mechanical forces bend flexible electronic devices to radii below 1 mm. To demonstrate that it is feasible to integrate low cost gas sensors into a textile while preserving the functionality, we developed an electronic nose system for textile integration. The electronic nose consists of four carbon black/polymer gas sensors fabricated on a flexible polymer substrate. After fabrication the substrate was cut into yarn like strips and integrated into a textile to create a smart textile with gas sensing functionalities. We used this smart textile to detect different solvent vapors and classified them accordingly. It was possible to detect single solvents such as acetone until a minimal concentration of 50 ppm. The influence of bending on sensors was studied, signal changes introduced by bending could be separated from changes due to solvent exposure. Bending of single strips to a radius below 1 mm did not alter the sensor functionality. The presented work shows the feasibility of the process in combination with textile integration.

[1]  O. Busto,et al.  Characterization and classification of the aroma of beer samples by means of an MS e-nose and chemometric tools , 2011, Analytical and bioanalytical chemistry.

[2]  N. Bârsan,et al.  Making environmental sensors on plastic foil , 2011 .

[3]  Jiri Janata,et al.  Conducting polymers in electronic chemical sensors , 2003, Nature materials.

[4]  Jiri Janata,et al.  Principles of Chemical Sensors , 1989 .

[5]  X. Tao,et al.  Highly Stretchable Conductive Polymer Composited with Carbon Nanotubes and Nanospheres , 2010 .

[6]  S. Wagner,et al.  A woven inverter circuit for e-textile applications , 2004, IEEE Electron Device Letters.

[7]  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.

[8]  Z. Suo,et al.  Mechanics of rollable and foldable film-on-foil electronics , 1999 .

[9]  Jin Young Kim,et al.  Air‐Stable Polymer Electronic Devices , 2007 .

[10]  Chang-Hung Li,et al.  Room-temperature-operated sensitive hybrid gas sensor based on amorphous indium gallium zinc oxide thin-film transistors , 2011 .

[11]  Antonella Macagnano,et al.  Flexible sensorial system based on capacitive chemical sensors integrated with readout circuits fully fabricated on ultra thin substrate , 2011 .

[12]  Evor L. Hines,et al.  Identification of Staphylococcus aureus infections in hospital environment: electronic nose based approach , 2005 .

[13]  Osvaldo N. Oliveira,et al.  Wine classification by taste sensors made from ultra-thin films and using neural networks , 2004 .

[14]  Stephen R. Forrest,et al.  The path to ubiquitous and low-cost organic electronic appliances on plastic , 2004, Nature.

[15]  Andrea Scorzoni,et al.  Flexible tag microlab development: Gas sensors integration in RFID flexible tags for food logistic , 2007 .

[16]  Nicola Donato,et al.  Flexible ethanol sensors on glossy paper substrates operating at room temperature , 2010 .

[17]  Christoph Zysset,et al.  Woven Thin-Film Metal Interconnects , 2010, IEEE Electron Device Letters.

[18]  C. Pornpanomchai,et al.  Beer classification by electronic nose , 2008, 2008 International Conference on Wavelet Analysis and Pattern Recognition.

[19]  Jean-Baptiste Sanchez,et al.  Ammonia gas sensor based on electrosynthesized polypyrrole films. , 2009, Talanta.

[20]  R. Jafari,et al.  Platform Design for Health-Care Monitoring Applications , 2007, 2007 Joint Workshop on High Confidence Medical Devices, Software, and Systems and Medical Device Plug-and-Play Interoperability (HCMDSS-MDPnP 2007).

[21]  K. Suslick,et al.  A colorimetric sensor array for identification of toxic gases below permissible exposure limits. , 2010, Chemical communications.

[22]  M. Pecht,et al.  To cut or not to cut: a thermomechanical stress analysis of polyimide thin-film on ceramic structures , 1995 .

[23]  S. P. Yawale,et al.  Application of chemically synthesized conducting polymer-polypyrrole as a carbon dioxide gas sensor , 2008 .

[24]  Gordon G. Wallace,et al.  Fabrication of an ammonia gas sensor using inkjet-printed polyaniline nanoparticles , 2008 .

[25]  Ernst Obermeier,et al.  Reactive ion etching for bulk structuring of polyimide , 2006 .

[26]  P. Su,et al.  Flexible NH3 sensors fabricated by in situ self-assembly of polypyrrole. , 2009, Talanta.

[27]  John Lewis.  Material challenge for flexible organic devices , 2006 .

[28]  S. Chua,et al.  A mechanical assessment of flexible optoelectronic devices , 2001 .

[29]  G. Korotcenkov.  Metal oxides for solid-state gas sensors: What determines our choice? , 2007 .

[30]  Q. Zheng,et al.  Improvement of gas sensing performance of carbon black/waterborne polyurethane composites: Effect of crosslinking treatment , 2006 .

[31]  Knut Rudi,et al.  Application of gas-sensor array technology for detection and monitoring of growth of spoilage bacteria in milk: A model study , 2006 .

[32]  R. Aiyer,et al.  Electrical and humidity sensing properties of synthesized hydrophosphoric acid doped polyaniline , 2008 .

[33]  Seung-Ho Jung,et al.  High-performance NO2 gas sensor based on ZnO nanorod grown by ultrasonic irradiation , 2009 .

[34]  Lingyan Wang,et al.  Molecularly mediated thin film assembly of nanoparticles on flexible devices: electrical conductivity versus device strains in different gas/vapor environment. , 2011, ACS nano.