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2016-10-06 - Colloque/Présentation - communication orale - Anglais - 2 page(s)

Walewyns Thomas, Marchand Nicolas, André Nicolas, Lahem Driss, Debliquy Marc , Francis Laurent, "A novel concept of environmental camera through volatile organic compounds sensing" in COST Action TD1105 - New Sensing Technologies for Air-Pollution Control and Environmental Sustainability, 5-7 October 2016 , Prague, Tchechian Republic, 2016

  • Codes CREF : Capteurs et périphériques (DI2563), Matériaux optiques (DI1256)
  • Unités de recherche UMONS : Science des Matériaux (F502)
  • Instituts UMONS : Institut de Recherche en Science et Ingénierie des Matériaux (Matériaux)
  • Centres UMONS : Ingénierie des matériaux (CRIM)

Abstract(s) :

(Anglais) Looking for better environmental monitoring and integrated industrial control systems using ultra-low-power and low-cost gas sensors is of main interest in the scope of the IoT1 based on interconnected sensor nodes. Selectivity and power consumption still remains a big issue in chemical gas detection systems, mostly based on heated metal oxide sensors, and raises challenges for new developments2. We designed a novel CMOS compatible multi-pixel platform dedicated to ultra-low-power environmental sensing, especially looking at volatile organic compounds (VOC) monitoring. Each pixel, made of interdigitated microelectrodes, is functionalized with a Molecular Imprinted Polymer (MIP) specific to the target VOC. Thanks to the tuning capabilities of the MIP materials, the selectivity can be highly increased3. Also, as the MIP materials are working at room temperature, no heater is needed, which considerably reduces the power consumption. Additionally, humidity detection can also be performed by covering a pixel with moisture sensitive material such as polyimide to compensate cross-sensitivity with humidity. Finally, temperature monitoring can be achieved with an on-chip diode. A 3 x 3 pixels² sensor has been fabricated as proof-of-concept as shown in Figure 1(a). Figure 1(b) presents the first results under formaldehyde (HCHO) exposure up to 30 ppm in N2 atmosphere, featuring gas absorption within the polymer. (a) (b) Figure 1. (a) Example of a 3 x 3 pixels² sensor covered by MIP. (b) Nyquist plots at 0, 20 and 30 ppm HCHO/N2. This novel “environmental camera” is very promising for low-cost multi-gas analysis, as preventive qualitative monitoring and/or warning system through dosimetry analysis. Further developments have to be achieved in order to improve both sensitivity and detection limit.