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Park, Seyeon; Kim, Minhyun; Lim, Yunsung; Oh, DongHwan; Ahn, Jaewan; Park, Chungseong; Woo, Sungyoon; Jung, WooChul; Kim, Jihan; Kim, Il‐Doo
Advanced materials (Weinheim), 06/2024, Letnik: 36, Številka: 24Journal Article
Light‐activated chemiresistors offer a powerful approach to achieving lower‐temperature gas sensing with unprecedented sensitivities. However, an incomplete understanding of how photoexcited charge carriers enhance sensitivity obstructs the rational design of high‐performance sensors, impeding the practical utilization under commonly accessible light sources instead of ultraviolet or higher‐energy sources. Here, a rational approach is presented to modulate the electronic properties of the parent metal oxide phase, exemplified by this model system of Bi‐doped In2O3 nanofibers decorated with Au nanoparticles (NPs) that exhibit superior NO2 sensing performance. Bi doping introduces mid‐gap energy levels into In2O3, promoting photoactivation even under visible blue light. Additionally, green‐absorbing plasmonic Au NPs facilitate electron transfer across the heterojunction, extending the photoactive region toward the green light. It is revealed that the direct involvement of photogenerated charge carriers in gas adsorption and desorption processes is pivotal for enhancing gas sensing performance. Owing to the synergistic interplay between the Bi dopants and the Au NPs, the Au‐BixIn2‐xO3 (x = 0.04) sensing layers attain impressive response values (Rg/Ra = 104 at 0.6 ppm NO2) under green light illumination and demonstrate practical viability through evaluation under simulated mixed‐light conditions, all of which significantly outperforms previously reported visible light‐activated NO2 sensors. The role of interface chemistry of Au‐BixIn2‐xO3 in green‐light‐activated NO2 sensing is systematically investigated. The synergistic interplay between Bi dopants and Au nanoparticles is the key to photosensitizing In2O3 to visible light, significantly reinforcing sensitivity and reversibility at ambient conditions. This meticulous study provides an understanding of the photoactivation mechanism mediated by two dissimilar photosensitizers.
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JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
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in: SICRIS
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