Room-Temperature NO₂ Sensors Based on UV-Assisted Pt Functionalized MoS₂-MoTe₂ Heterostructures

IF 5.8 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Journal of Alloys and Compounds Pub Date : 2025-05-17 DOI:10.1016/j.jallcom.2025.181004

Shraddha Hambir, Sithara Radhakrishnan, Chandra Sekhar Rout, Shweta Jagtap

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引用次数: 0

Abstract

Nitrogen dioxide (NO₂), a harmful air pollutant, poses severe risks to health and the environment, requiring efficient detection technologies. Transition metal dichalcogenides (TMDs) like MoS₂ and MoTe₂, with their excellent electronic properties and high gas response, are promising candidates for sensing applications. In this study, MoS₂-MoTe₂ heterostructures were synthesized via a hydrothermal method followed by functionalization with platinum (Pt) using a post-synthesis impregnation technique. The study revealed that 2 wt.% Pt-functionalized MoS₂-MoTe₂ heterostructures demonstrated exceptional NO₂ sensing performance at room temperature, achieving a remarkable sensor response (R_a/R_g) of 9.58 for 5 ppm NO₂ under UV irradiation, with significantly faster response/recovery times of 21/99 seconds. To the best of our knowledge, detailed report on Pt-functionalized MoS₂-MoTe₂ heterostructures for NO₂ gas sensing is not available. This performance enhancement is attributed to strain-induced modifications in the phonon structure caused by Pt functionalization, as observed in XRD and Raman analysis, which led to improved charge transfer and adsorption properties. Furthermore, UV irradiation played a pivotal role by not only generating additional charge carriers but also activating photocatalytic processes, thereby improving the desorption of gas molecules and enhancing the response-recovery dynamics. This innovative approach holds promise for a significant breakthrough in the development of highly efficient 2D-material-based gas sensors.

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基于uv辅助Pt功能化MoS 2 -MoTe 2异质结构的室温NO 2传感器

二氧化氮（NO₂）是一种有害的空气污染物，对健康和环境构成严重威胁，需要高效的检测技术。过渡金属二硫族化合物（TMDs）如MoS₂和MoTe₂，具有优异的电子性能和高的气体响应，是传感应用的有希望的候选者。在本研究中，通过水热法合成MoS₂-MoTe₂异质结构，然后使用合成后浸渍技术与铂（Pt）进行功能化。研究表明，2 wt.% pt功能化的MoS₂-MoTe₂异质结构在室温下表现出优异的NO₂传感性能，在紫外线照射下，在5 ppm NO₂下，传感器响应（Ra/Rg）达到9.58，响应/恢复时间明显加快，为21/99秒。据我们所知，目前还没有关于pt功能化MoS₂-MoTe₂异质结构用于NO₂气敏的详细报道。XRD和Raman分析表明，这种性能的增强是由于Pt功能化引起的声子结构的应变诱导修饰，从而改善了电荷转移和吸附性能。此外，紫外线照射不仅产生了额外的载流子，还激活了光催化过程，从而改善了气体分子的解吸，增强了响应-恢复动力学。这种创新的方法有望在开发高效的基于2d材料的气体传感器方面取得重大突破。

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来源期刊

Journal of Alloys and Compounds 工程技术-材料科学：综合

CiteScore

11.10

自引率

14.50%

发文量

5146

审稿时长

67 days

期刊介绍： The Journal of Alloys and Compounds is intended to serve as an international medium for the publication of work on solid materials comprising compounds as well as alloys. Its great strength lies in the diversity of discipline which it encompasses, drawing together results from materials science, solid-state chemistry and physics.