III-nitride nanostructures for optical gas detection and pH sensing

Sumit Paul; Konrad Maier; Aparna Das; Florian Furtmayr; Andreas Helwig; Jörg Teubert; Eva Monroy; Gerhard Müller; Martin Eickhoff

doi:10.1117/12.2015221

29 May 2013 III-nitride nanostructures for optical gas detection and pH sensing

Sumit Paul, Konrad Maier, Aparna Das, Florian Furtmayr, Andreas Helwig, Jörg Teubert, Eva Monroy, Gerhard Müller, Martin Eickhoff

Author Affiliations +

Proceedings Volume 8725, Micro- and Nanotechnology Sensors, Systems, and Applications V; 87250K (2013) https://doi.org/10.1117/12.2015221
Event: SPIE Defense, Security, and Sensing, 2013, Baltimore, Maryland, United States

Abstract

The paper presents a novel concept for the realization of optochemical sensor systems which are capable of operating in harsh environments. Key components in such sensors are nanostructures formed from gallium nitride (GaN) and its alloys with aluminum (Al) and indium (In). Nanostructures of this kind emit an efficient, visible-light photoluminescence (PL) which can be excited with low-cost ultraviolet light sources and which extends up to temperatures in the order of 200°C. When exposed to various chemical environments, changes in the PL intensity occur which constitute valuable sensor signals. Due to the all-optical approach, the PL can be excited and its chemically induced changes be read out without requiring electrical wiring at the point of measurement. The present paper presents this innovative sensor concept, the nanostructures and optochemical transducer structures that form its material base, as well as several applications of such transducers in the fields of gas and fluid sensing. The applications addressed here range from the sensing of ppb concentrations of H₂, NO₂ and O₃ in gaseous environments to the pH monitoring in aqueous solutions.

Citation Download Citation

Sumit Paul, Konrad Maier, Aparna Das, Florian Furtmayr, Andreas Helwig, Jörg Teubert, Eva Monroy, Gerhard Müller, and Martin Eickhoff "III-nitride nanostructures for optical gas detection and pH sensing", Proc. SPIE 8725, Micro- and Nanotechnology Sensors, Systems, and Applications V, 87250K (29 May 2013); https://doi.org/10.1117/12.2015221

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