2024-02-01 ロイヤルメルボルン工科大学(RMIT)
◆センサーは危険なアンモニア漏れを早期に検知し、呼気中のアンモニアを計測して健康障害を診断する可能性がある。低コストでスケーラブルな製造プロセスを採用し、既存のシリコン産業製造プロセスとも適合。研究者は業界パートナーと協力してセンサーの発展と試作を進め、量産可能な製造を目指す。
＜関連情報＞
- https://www.rmit.edu.au/news/all-news/2024/feb/ammonia-sensor
- https://onlinelibrary.wiley.com/doi/10.1002/adfm.202309342
高性能アンモニアセンサ用の瞬時空気液体金属プリント極薄酸化スズ Instant-in-Air Liquid Metal Printed Ultrathin Tin Oxide for High-Performance Ammonia Sensors
Chung Kim Nguyen, Patrick D. Taylor, Ali Zavabeti, Hamidah Alluhaybi, Samira Almalki, Xiangyang Guo, Mehmood Irfan, Mohammad Al Kobaisi, Samuel J. Ippolito, Michelle J.S. Spencer …
Advanced Functional Materials Published: 15 November 2023
DOI:https://doi.org/10.1002/adfm.202309342
Abstract
Liquid metal-based printing techniques are emerging as an exemplary platform for harvesting non-layered 2D materials with a thickness down to a few nanometres, leading to an ultra-large surface-area-to-volume ratio that is ideal for sensing applications. In this work, the synthesis of 2D tin dioxide (SnO2) by exfoliating the surface oxide of molten tin is reported which highlights the enhanced sensing capability of the obtained materials to ammonia (NH3) gas is reported. It is demonstrated that amperometric gas sensors based on liquid metal-derived 2D SnO2 nanosheets can achieve excellent NH3 sensing performance at low temperature (150 °C) with and without UV light assistance. Detection over a wide range of NH3 concentrations (5–500 ppm) is observed, revealing a limit of detection at the parts per billion (ppb) level. The 2D SnO2 nanosheets also feature excellent cross-interference performance toward different organic and inorganic gas species, showcasing a high selectivity. Further, ab initio DFT calculations reveal the NH3 adsorption mechanism is dominated by chemisorption with a charge transfer into 2D SnO2 nanosheets. In addition, a proof of concept for prototype flexible ammonia sensors is demonstrated by depositing 2D SnO2 on a polyimide substrate, signifying the high potential of employing liquid metal printed SnO2 for realizing wearable gas sensors.
