期刊
SENSORS AND ACTUATORS B-CHEMICAL
卷 399, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2023.134807
关键词
2D materials; Graphene; Antimonene; Adsorption; DFT; Hydrogen
The study developed unique nanoengineered bi-stacked layers based on 2D Pnictogens and graphene, amongst which hybrid Sb/G sensor showed excellent gas response towards H-2 with high selectivity and fast response times. The outstanding performance of Sb/G sensor positioned it as one of the highly selective and fast hydrogen sensors within the Pnictogen-graphene family.
We have developed unique nanoengineered bi-stacked layers based on 2D Pnictogens and graphene (G) sheets via photolithography. Amongst the Pnictogen class (phosphorene/G (P/G), antimonene/G (Sb/G), arsenene/G (As/G), and bismuthine/G (Bi/G), hybrid Sb/G demonstrated excellent gas response towards H-2 (similar to 4-fold improvement), high selectivity, fast response/recovery times (>3 fold reduction), and ultra-low limit of detection (LOD: 0.05 ppm) over pristine Sb or G sensors. Amongst others, LOD of P/G was comparable to that of Sb/G while it degraded for As/G and Bi/G heterostructures. The density functional theory (DFT) calculations demonstrated a Bader charge transfer mechanism from Sb/G heterojunction towards H-2 gas, modulating the potential barrier from Ohmic to Schottky type. The outstanding gas sensing performance of the Sb/G sensor places it amongst highly selective and fast hydrogen sensors amongst Pnictogen-graphene family.
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