The exploration of triethylamine (TEA) gas sensor with low cost, high response and low detection limit is still an urgent challenge. In this work, carbon dots (CDs) activated spherical Tin oxide (SnO) nanocomposites were synthesized by a simple and friendly one-pot hydrothermal strategy, and CDs with rich functional groups are in-situ introduced into SnO. SnO/CDs composites were characterized by X-ray diffraction, transmission electron microscopy and X-ray photoelectron spectroscopy, etc. The gas sensing properties of SnO/CDs and SnO for triethylamine (TEA) were systematically investigated. The sensor based on SnO/CDs exhibits a highly sensitive response, good selectivity, repeatability and long stability. It shows the response (/ = 55) to 100 ppm TEA is approximately 1.8 times that of SnO sensor. More attractively, the detection limit of the SnO/CDs composite to TEA is 90 ppb, which is 6.7 times that of SnO. The significantly improved TEA sensing performance of SnO/CDs sensing material is mainly attributed to the formation of heterojunction and the increased active sites due to the introduction of CDs.

中文翻译：

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一锅溶剂热法合成SnO2/碳点纳米复合材料用于高灵敏度三乙胺气体传感器

探索低成本、高响应、低检测限的三乙胺（TEA）气体传感器仍然是一个紧迫的挑战。在这项工作中，通过简单友好的一锅水热策略合成了碳点（CD）活化的球形氧化锡（SnO）纳米复合材料，并将具有丰富官能团的CD原位引入到SnO中。采用X射线衍射、透射电子显微镜和X射线光电子能谱等手段对SnO/CDs复合材料进行了表征，系统研究了SnO/CDs和SnO对三乙胺（TEA）的气敏性能。基于SnO/CDs的传感器表现出高灵敏度的响应、良好的选择性、重复性和长期稳定性。它显示对 100 ppm TEA 的响应 (/ = 55) 大约是 SnO 传感器的 1.8 倍。更有吸引力的是，SnO/CDs复合材料对TEA的检测限为90 ppb，是SnO的6.7倍。SnO/CDs传感材料的TEA传感性能显着提高主要归因于异质结的形成以及由于CDs的引入而增加的活性位点。