New Indigo/Nanocarbons Hybrid Material as Chemical Filter for the Enhancement of Gas Sensor Selectivity towards Nitrogen Dioxide

Abstract:

A new hybrid material performed by the immobilization of indigo particles on nanocarbonaceous matrix has been developed, characterized and implemented with chemoresistors. If phthalocyanine-based chemoresistors provide a high sensitivity, a low threshold of detection and a partial selectivity towards oxidizing pollutants, indigo/nanocarbons hybrid material acts as a selective ozone filter from air sample and so strongly enhances the sensor selectivity towards nitrogen dioxide. The functionalization, highlighted by scanning electron microscopy, X-ray diffraction and thermogravimetric analysis, occurs in a non-covalent way and proceeds through pi-stacking interactions. With filtering yields higher than 99.5% for ozone and less than 5% for nitrogen dioxide, indigo adsorbed onto multi-wall carbon nanotubes has been identified as the most selective filtering material while exhibiting a much greater durability than indigo or nanotubes separately. Associated to phthalocyanine-based gas sensor, the sustainable, selective and real-time monitoring of NO₂ in ppb range has been successfully achieved.

• Periodical: Key Engineering Materials (Volume 605)
• Pages: 135-138
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.605.135
• Online since: April 2014
• Authors: J. Brunet, A. Pauly, M. Dubois, C. Varenne, K. Guerin, A. Ndiaye
• Keywords: Chemical Filter, Hybrid Material, Indigo, Nanocarbons, Nitrogen Dioxide, Selective Gas Sensor

References

[1] A. Gurlo, N. Barsan, M. Ivanovskaya, U. Weimar and W. Göpel: Sens. Actuators, B 47 (1998), p.92.

[2] International Center for Technology Assessment, In-Car Air Pollution: The Hidden Threat to Automobile Drivers: Report No. 4, An Assessment of the Air Quality Inside Automobile Passenger Compartments (2000).

[3] M. Saadoun, M. F Boujmil, L. El Mir, B. Bessaïs: Sensor Letters 7 (2009), p.725

[4] M. Rapp, R. Stanzel, M.V. Schickfus, S. Hunklinger, H. Fuchs, W. Schrepp, H. Keller and B. Fleischmann: Thin Solid Films 210–211 (1992), p.474.

DOI: 10.1016/0040-6090(92)90316-4

[5] A. Schütze, N. Pieper and J. Zacheja: Sens. Actuators, B 23 (1995), p.215.

[6] J. Brunet, V. Parra Garcia, A. Pauly, C. Varenne and B. Lauron: Sens. Actuators, B 134 (2008), p.632.

[7] J. Brunet, A. Pauly, C. Varenne and B. Lauron: Sens. Actuators, B 130 (2008), p.908.

[8] Y.Y. Fong, A.Z. Abdullah, A.L. Ahmad, S. Bhatia: Sensor Letters 5 (2007), p.485.