Instant-in-Air Liquid Metal Printed Ultrathin Tin Oxide for High-Performance Ammonia Sensors

被引:15
作者
Nguyen, Chung Kim [1 ]
Taylor, Patrick D. [2 ]
Zavabeti, Ali [1 ,3 ]
Alluhaybi, Hamidah [4 ]
Almalki, Samira [4 ]
Guo, Xiangyang [1 ]
Irfan, Mehmood [1 ]
Al Kobaisi, Mohammad [4 ]
Ippolito, Samuel J. [1 ,4 ]
Spencer, Michelle J. S. [2 ]
Balendhran, Sivacarendran [5 ]
Roberts, Ann [5 ,6 ]
Daeneke, Torben [1 ]
Crozier, Kenneth B. [5 ,6 ,7 ]
Sabri, Ylias [1 ,4 ]
Syed, Nitu [1 ,5 ,6 ]
机构
[1] RMIT Univ, Sch Engn, Melbourne, Vic 3001, Australia
[2] RMIT Univ, ARC Ctr Excellence Future Low Energy Elect, Sch Sci, Melbourne, Vic 3001, Australia
[3] Univ Melbourne, Dept Chem Engn, Parkville, Vic 3010, Australia
[4] RMIT Univ, Ctr Adv Mat & Ind Chem CAMIC, Sch Sci, Melbourne, Vic 3001, Australia
[5] Univ Melbourne, Sch Phys, Parkville, Vic 3010, Australia
[6] Univ Melbourne, ARC Ctr Excellence Transformat Meta Opt Syst, Parkville, Vic 3010, Australia
[7] Univ Melbourne, Dept Elect & Elect Engn, Parkville, Vic 3010, Australia
关键词
2D materials; ammonia sensing; DFT calculations; liquid metal; tin oxide; GAS SENSORS; HYDROGEN STORAGE; THIN-FILMS; SNO2; SURFACE; NH3;
D O I
10.1002/adfm.202309342
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
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 degrees 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. Instant-in-air liquid metal printing facilitates the deposition of ultrathin tin dioxide nanosheet which is used for fabricating ammonia sensors featuring high repeatability, high selectivity, large dynamic range with low detection limit, and insignificant memory effects. A proof of concept for flexible sensors is demonstrated, signifying the high potential of employing liquid metal printing for realizing wearable sensors.image
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页数:12
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