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Accordion-like-Ti3C2 MXene-Based Gas Sensors with Sub-ppm Level Detection of Acetone at Room Temperature

ACS applied electronic materials(2022)SCI 3区SCI 4区

United Arab Emirates Univ

Cited 32|Views18
Abstract
Compared to traditional-metal oxide-based gas sensors (MOS), the progress of high-performance room-temperature (RT) gas-sensing materials has captivated a lot of interest in recent years. MXenes, two-dimensional (2D) transition-metal carbides/nitrides, have recently been discovered and gained tremendous consideration for gas sensing applications due to their superior chemical and physical properties. Herein, we successfully synthesized accordion-like Ti3C2Tx MXene multilayers by a selective HF-etching method at 60 ? to be used as a chemiresistive sensor for acetone vapor. The fabricated sensor successfully detected acetone vapor at the parts per billion (ppb) level and showed a p-type sensing behavior. The limit of detection (LOD) of acetone vapor was about 250 ppb with a fast response time of 53 s. The sensor exhibited good repeatability, high selectivity toward acetone among other test gases, and excellent stability even after 4 months. The sensing mechanism was proposed in terms of the interaction between the charge carriers of accordion-like Ti3C2Tx, multiple hydrogen bonding between different functional groups on the MXene surface, and acetone vapor species. The prepared sensor also showed high sensitivity toward acetone vapor at RT (23 ?); hence, it lends itself high potential as a breath sensor for diabetic patients.
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MXene,2D nanomaterials,Ti3C2Tx,acetone,room-temperature gas sensor
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要点】:本研究成功合成了类似手风琴的Ti3C2Tx MXene多层结构,可用作检测乙酮蒸气的化学电阻传感器,其创新点在于能够在室温下达到亚ppm级别的乙酮检测灵敏度。

方法】:通过选择性氢氟酸蚀刻方法在60°C成功合成类似手风琴的Ti3C2Tx MXene多层。

实验】:所制备的传感器能在ppb级别成功检测乙酮蒸气,并表现出n型传感行为。乙酮蒸气的检测限约为250 ppb,响应时间仅为53秒。该传感器对乙酮具有很好的重复性、高选择性,并且在4个月后仍保持出色的稳定性。实验使用的是乙酮作为测试气体,数据集名称未提及。