Articles | Volume 5, issue 1
J. Sens. Sens. Syst., 5, 179–185, 2016
https://doi.org/10.5194/jsss-5-179-2016

Special issue: High-temperature sensors and materials

J. Sens. Sens. Syst., 5, 179–185, 2016
https://doi.org/10.5194/jsss-5-179-2016

Regular research article 25 May 2016

Regular research article | 25 May 2016

High-temperature stable indium oxide photonic crystals: transducer material for optical and resistive gas sensing

Sabrina Amrehn, Xia Wu, and Thorsten Wagner Sabrina Amrehn et al.
  • Department of Chemistry, University of Paderborn, Paderborn, Germany

Abstract. Indium oxide (In2O3) inverse opal is a promising new transducer material for resistive and optical gas sensors. The periodically ordered and highly accessible pores of the inverse opal allow the design of resistive sensors with characteristics independent of structure limitations, such as diffusion effects or limited conductivity due to constricted crosslinking. Additionally the photonic properties caused by the inverse opal structure can be utilized to read out the sensors' electronical state by optical methods. Typically semiconducting sensors are operated at high temperatures (> 300 °C). To maintain a good thermal stability of the transducer material during operation is a minimum requirement. We present results on the synthesis and investigation of the structural stability of the In2O3 inverse opal structure up to a temperature of 550 °C (limit of substrate material). As will be shown, their optical properties are maintained with only slight shifts of the photonic band gaps which can be explained by the results from the structural characterization using X-ray diffraction and electron microscopy combined with optical simulations.

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Short summary
Indium oxide inverse opal is a promising new material for optical gas sensors. The photonic properties caused by the inverse opal structure can be utilized to read out the sensors’ electronical state by optical methods. The maintenance of good thermal stability of transducer material during operation is a minimum requirement. We present results on the synthesis and investigation of the structural stability of the In2O3 inverse opal structure up to a temperature of 550 °C (limit of substrate).