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Synergism of Edge Effect and Interlayer Engineering of VS2 on CNFs for Rapid and Precise NO2 Detection
ACS Sensors ( IF 8.2 ) Pub Date : 2023-10-12 , DOI: 10.1021/acssensors.3c01526
Huajing Wang 1 , Zhou Cui 2 , Rui Xiong 2 , Xiaoxia Wang 1 , Wulin Song 1 , Xiang Guo 3 , Xiao Wu 2 , Baisheng Sa 2 , Dawen Zeng 1
ACS Sensors ( IF 8.2 ) Pub Date : 2023-10-12 , DOI: 10.1021/acssensors.3c01526
Huajing Wang 1 , Zhou Cui 2 , Rui Xiong 2 , Xiaoxia Wang 1 , Wulin Song 1 , Xiang Guo 3 , Xiao Wu 2 , Baisheng Sa 2 , Dawen Zeng 1
Affiliation
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Although two-dimensional (2D) transition-metal dichalcogenides (TMDs) exhibit attractive prospects for gas-sensing applications, the rapid and precise sensing of TMDs at low loss remains challenging. Herein, a NO2 sensor based on an expanded VS2 (VS2-E)/carbon nanofibers (CNFs) composite (abbreviated as VS2-E-C) with ultrafast response/recovery at a low-loss state is reported. In particular, the impact of the CNF content on the NO2-sensing performance of VS2-E-C was thoroughly explored. Expanded VS2 nanosheets were grafted onto the surface of hollow CNFs, and the combination boosted the charge transport, exposing abundant active edges of VS2, which enhanced the adsorption of NO2 efficiently. The activity of the VS2 edge is further confirmed by stronger NO2 adsorption with a more negative adsorption energy (−3.42 eV) and greater than the basal VS2 surface (−1.26 eV). Moreover, the exposure of rich edges induced the emergence of the expanded interlayers, which promoted the adsorption/desorption of NO2 and the interaction of gas molecules within VS2-E-C. The synergism of edge effect and interlayer engineering confers the VS2-E-C3 sensor with ultrafast response/recovery speed (9/10 s) at 60 °C, high sensitivity (∼2.50 to 15 ppm NO2), good selectivity/stability, and a low detection limit of 23 ppb. The excellent “4S” functions indicate the promising prospect of the VS2-E-C3 sensor for fast and precise NO2 detection at low-loss condition.
中文翻译：
边缘效应和 VS2 层间工程在 CNF 上的协同作用，实现快速、精确的 NO2 检测
尽管二维 (2D) 过渡金属二硫属化物 (TMD) 在气体传感应用中展现出诱人的前景，但在低损耗下快速、精确地传感 TMD 仍然具有挑战性。本文报道了一种基于膨胀VS 2 (VS 2 - E )/碳纳米纤维(CNF)复合材料(缩写为VS 2 -EC )的NO 2传感器，该传感器在低损耗状态下具有超快响应/恢复。特别是，深入探讨了CNF含量对VS 2 -EC的NO 2传感性能的影响。将膨胀的VS 2纳米片接枝到中空CNF的表面，这种组合促进了电荷传输，暴露出丰富的VS 2活性边缘，从而有效地增强了NO 2的吸附。VS 2边缘的活性通过更强的NO 2吸附进一步证实，其具有更大的负吸附能（-3.42 eV）并且大于基础VS 2表面（-1.26 eV）。此外，丰富边缘的暴露诱导了膨胀夹层的出现，促进了VS 2 -EC内NO 2的吸附/解吸和气体分子的相互作用。边缘效应和层间工程的协同作用使 VS 2 -E-C3传感器在 60 °C 下具有超快响应/恢复速度 (9/10 s)、高灵敏度（∼2.50 至 15 ppm NO 2）、良好的选择性/稳定性，检测限低至 23 ppb。优异的“4S”功能预示着VS 2 -E-C3传感器在低损耗条件下快速、精确检测NO 2的广阔前景。
更新日期：2023-10-12
中文翻译：
边缘效应和 VS2 层间工程在 CNF 上的协同作用，实现快速、精确的 NO2 检测
尽管二维 (2D) 过渡金属二硫属化物 (TMD) 在气体传感应用中展现出诱人的前景，但在低损耗下快速、精确地传感 TMD 仍然具有挑战性。本文报道了一种基于膨胀VS 2 (VS 2 - E )/碳纳米纤维(CNF)复合材料(缩写为VS 2 -EC )的NO 2传感器，该传感器在低损耗状态下具有超快响应/恢复。特别是，深入探讨了CNF含量对VS 2 -EC的NO 2传感性能的影响。将膨胀的VS 2纳米片接枝到中空CNF的表面，这种组合促进了电荷传输，暴露出丰富的VS 2活性边缘，从而有效地增强了NO 2的吸附。VS 2边缘的活性通过更强的NO 2吸附进一步证实，其具有更大的负吸附能（-3.42 eV）并且大于基础VS 2表面（-1.26 eV）。此外，丰富边缘的暴露诱导了膨胀夹层的出现，促进了VS 2 -EC内NO 2的吸附/解吸和气体分子的相互作用。边缘效应和层间工程的协同作用使 VS 2 -E-C3传感器在 60 °C 下具有超快响应/恢复速度 (9/10 s)、高灵敏度（∼2.50 至 15 ppm NO 2）、良好的选择性/稳定性，检测限低至 23 ppb。优异的“4S”功能预示着VS 2 -E-C3传感器在低损耗条件下快速、精确检测NO 2的广阔前景。
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