8.1.1 InGaN/GaN nanowire based opto-chemical sensor for detecting hydrogen and hydrocarbons at low temperature

Sumit Paul, Andreas Helwig, Gerhard Müller, Jörg Teubert & Martin Eickhoff
We report on InGaN/GaN nanowires (NWs) as opto-chemical transducers for the detection of H2 and hydrocarbons. The NWs exhibit a strong photoluminescence (PL) which persists up to temperatures of 150°C and above. The GaN/InGaN NWs were grown by plasma-assisted molecular beam epitaxy on low-resistivity n-type Si (111) substrates and covered with a semitransparent catalytic Pt-coating after deposition. With the thin Pt coating on top, the PL intensity is dependent on the concentration of hydrogen or...