N-doped graphene/MoS2-xSex nanocomposites with large and abundant interface area for ultrasensitive NO2 detection

IF 3.7 1区化学 Q1 CHEMISTRY, ANALYTICAL

Sensors and Actuators B: Chemical Pub Date : 2025-07-03 DOI:10.1016/j.snb.2025.138242

Mingli Yin , Chunxiao Gao , Rongrong Yang , Changwei Zou , Lingmin Yu , Yan Huang

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Abstract

Realizing large-area bonding of heterojunction interfaces is of great significance for enhancing the synergistic effect and gas sensing performance of the Van der Waals hybrid structures. Here, after the activation treatment of the basal planes of the construction materials, an N-doped graphene (NG)/MoS_2-xSe_x nanocomposite with MoS_2-xSe_x nanocomposites coating NG scaffolds have been successively synthesized by a simple two-step growth process for ultrasensitive NO₂ detection. TEM characterization result indicates that the two materials form a large-area heterojunction interface bonding. HRTEM, XRD, XPS and Raman spectra confirm the formation of the tightly integrated NG/MoS_2-xSe_x heterostructures. Thanks to the large interface area, the response of the optimal NG/MoS_2-xSe_x sensor to 50 ppm NO₂ is as high as 24.3 at 25ºC, which is about 3.1 and 16.5 times that of the MoS_2-xSe_x and NG sensors, respectively. In addition, the sensor also exhibits high selectivity, long-term stability, and ppb-level detection limit. The possible gas sensing enhancement mechanism of composite materials has been extensively discussed.

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氮掺杂石墨烯/MoS2-xSex纳米复合材料具有大而丰富的界面面积，用于超灵敏的NO2检测

实现异质结界面的大面积键合对于增强范德华杂化结构的协同效应和气敏性能具有重要意义。本文通过对建筑材料基面进行活化处理后，通过简单的两步生长工艺，相继合成了一种n掺杂石墨烯(NG)/MoS2-xSex纳米复合材料涂层NG支架的纳米复合材料，用于超灵敏的NO2检测。TEM表征结果表明，两种材料形成大面积异质结界面键合。HRTEM、XRD、XPS和拉曼光谱证实了紧密结合的NG/MoS2-xSex异质结构的形成。由于界面面积大，在25℃时，最优的NG/MoS2-xSex传感器对50 ppm NO2的响应高达24.3，分别是MoS2-xSex和NG传感器的3.1和16.5倍。此外，该传感器还具有高选择性、长期稳定性和ppb级检测限。对复合材料可能的气敏增强机理进行了广泛的讨论。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Sensors and Actuators B: Chemical 工程技术-电化学

CiteScore

14.60

自引率

11.90%

发文量

1776

审稿时长

3.2 months

期刊介绍： Sensors & Actuators, B: Chemical is an international journal focused on the research and development of chemical transducers. It covers chemical sensors and biosensors, chemical actuators, and analytical microsystems. The journal is interdisciplinary, aiming to publish original works showcasing substantial advancements beyond the current state of the art in these fields, with practical applicability to solving meaningful analytical problems. Review articles are accepted by invitation from an Editor of the journal.