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Published on: October 12, 2019
Bias-enhanced optical pH response of group III-nitride nanowires
Jens Wallys1, Jörg Teubert, Florian Furtmayr
1I. Physikalisches Institut, Justus-Liebig-Universität Gießen, Heinrich-Buff-Ring 16, D-35392 Gießen, Germany.
Abstract:
We show that the photoluminescence intensity of GaN and InGaN nanowires in electrolytes sensitively responds to variations of the pH value and the applied bias. The realization of an electrochemical working point allows pH detection with a resolution better than 0.05 pH. The observed effects are attributed to bias-dependent nonradiative recombination processes competing with interband transitions. The results show that group III-nitride nanowires are excellently suited as nanophotonic pH sensor elements.

