CuO nanostructure-decorated InGaN nanorods for selective H2S gas detection

Establishing a heterostructure is one of the adequate strategies for enhancing device performance and has been explored in sensing, and energy applications. In this study, we constructed a heterostructure through a two-step process involving hydrothermal synthesis of CuO nanostructures and subsequen...

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Veröffentlicht in:Physical chemistry chemical physics : PCCP 2024-05, Vol.26 (21), p.15530-15538
Hauptverfasser: Thota, Chandrakalavathi, Gangadhara, C, Radhalayam, Dhanalakshmi, Ramu Singiri, Na-Hyun Bak, Paruchuri Kondaiah, Ningappa, C, Maddaka, Reddeppa, Moon-Deock, Kim
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Sprache:eng
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Zusammenfassung:Establishing a heterostructure is one of the adequate strategies for enhancing device performance and has been explored in sensing, and energy applications. In this study, we constructed a heterostructure through a two-step process involving hydrothermal synthesis of CuO nanostructures and subsequent spin coating on MBE-grown InGaN NRs. We found that the CuO content on the InGaN NRs has a great impact on carrier injection at the heterojunction and thus the H2S gas sensing performance. Popcorn CuO/InGaN NR shows excellent gas sensing performance towards different concentrations of H2S at room temperature. The highest response is up to 35.54% to a H2S concentration of 100 ppm. Even more significantly, this response is further enhanced significantly (123.70%) under 365 nm UV light. In contrast, this composite structure exhibits negligibly low responses to 100 ppm of NO2, H2, CO, and NH3. The heterostructure band model associated with a surface reaction model is manifested to elucidate the sensing mechanism.
ISSN:1463-9076
1463-9084
DOI:10.1039/d3cp06318f