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Enhanced NO2 sensing performance of S-doped biomorphic SnO2 with increased active sites and charge transfer at room temperature
Inorganic Chemistry Frontiers ( IF 7 ) Pub Date : 2020-04-02 , DOI: 10.1039/d0qi00119h
Wenna Li 1, 2, 3, 4, 5 , Lang He 1, 2, 3, 4, 5 , Xue Bai 1, 2, 3, 4, 5 , Lujia Liu 1, 2, 3, 4, 5 , Muhammad Ikram 1, 2, 3, 4, 5 , He Lv 1, 2, 3, 4, 5 , Mohib Ullah 1, 2, 3, 4, 5 , Mawaz Khan 1, 2, 3, 4, 5 , Kan Kan 6, 7, 8, 9 , Keying Shi 1, 2, 3, 4, 5
Affiliation  

S-Doped biomorphic SnO2 was synthesized using biomass carbon as a template, where the biomorphic SnO2 adopts the morphology of the biomass. After the in situ growth of hexagonal or semi-hexagonal SnS2 on biomorphic SnO2, the structure of the bio-template was retained. This method is simple, eco-friendly, and cost-effective. The S-termination of SnS2 can effectively react with NO2 and thereby improve the gas sensing performance. As expected, the gas sensing performance significantly increased. The S-doped biomorphic SnO2 shows an excellent response to 100 ppm NO2 (∼57.38), a fast response time (∼1.60 s), and a low detection limit of as low as 10 ppb at room temperature (RT). The gas sensing performance exhibited strong dependence on the number of S–Sn–O chemical bonds. S–Sn–O chemical bonds can be regarded as bridges for electron transport. Chemical bonds reduced the interface state density and increased the carrier density, resulting in more chemisorbed oxygen and led to more NO2 reacting with the S-BCS-600 sensor at RT.

中文翻译:

室温下具有增强的活性位点和电荷转移,增强了S掺杂生物形态SnO2的NO2感测性能

以生物质碳为模板合成了S掺杂生物质SnO 2,其中生物质SnO 2采用生物质的形态。在生物形SnO 2原位生长六角形或半六角形SnS 2之后,生物模板的结构得以保留。该方法简单,环保且具有成本效益。SnS 2的S末端可以有效地与NO 2反应,从而改善气体传感性能。正如预期的那样,气体传感性能显着提高。S掺杂的生物形态SnO 2对100 ppm NO 2表现出出色的响应(〜57.38),快速响应时间(〜1.60 s)和在室温(RT)下低至10 ppb的低检测限。气体传感性能表现出强烈依赖于S–Sn–O化学键的数量。S–Sn–O化学键可被视为电子传输的桥梁。化学键降低了界面态密度并增加了载流子密度,从而导致更多的化学吸附氧并导致更多的NO 2在室温下与S-BCS-600传感器反应。
更新日期:2020-04-02
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