High-sensitivity room-temperature NH3 detection of SnO2/SnS2 nanocomposites by modulating annealing temperature

IF 3.8 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Vacuum Pub Date : 2025-05-10 DOI:10.1016/j.vacuum.2025.114401

Meihua Li, Weiyi Li

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Abstract

In this study, SnO₂/SnS₂ nanomaterials were successfully prepared by hydrothermal method combined with gradient annealing process. XRD analysis showed that the materials formed a hexagonal SnS₂ and tetragonal SnO₂ biphasic coexisting structure with a significant increase in the crystallinity after annealing at 300 °C. SEM/TEM characterization showed that SnO₂ nanoparticles were uniformly anchored on the surface of SnS₂ nanosheets to form a three-dimensional hierarchical heterostructure. XPS testing confirms the presence of stabilized Sn⁴⁺/S²⁻ chemical states and abundant oxygen vacancy defects on the material surface. Thanks to the synergistic effect of the heterojunction interface and oxygen vacancies, the sensor exhibits high sensitivity (R_a/R_g = 12.6), high selectivity and fast response to 100 ppm NH₃ at room temperature (25 °C ± 2 °C), with a lower detection limit of 10 ppm. In this study, by adjusting the annealing temperature, we realized the efficient detection of NH₃ at room temperature.

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调节退火温度的SnO2/SnS2纳米复合材料的室温高灵敏度NH3检测

本研究采用水热法结合梯度退火工艺成功制备了SnO2/SnS2纳米材料。XRD分析表明，材料在300℃退火后形成六方SnS2和四方SnO2双相共存结构，结晶度显著提高。SEM/TEM表征表明，SnO2纳米颗粒均匀锚定在SnS2纳米片表面，形成三维分层异质结构。XPS测试证实材料表面存在稳定的Sn4+/S2−化学态和丰富的氧空位缺陷。由于异质结界面和氧空位的协同作用，该传感器具有高灵敏度（Ra/Rg = 12.6）、高选择性和在室温（25°C±2°C）下对100 ppm NH3的快速响应，检测限低至10 ppm。在本研究中，我们通过调整退火温度，实现了在室温下对NH3的高效检测。

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

Vacuum 工程技术-材料科学：综合

CiteScore

6.80

自引率

17.50%

发文量

审稿时长

34 days

期刊介绍： Vacuum is an international rapid publications journal with a focus on short communication. All papers are peer-reviewed, with the review process for short communication geared towards very fast turnaround times. The journal also published full research papers, thematic issues and selected papers from leading conferences. A report in Vacuum should represent a major advance in an area that involves a controlled environment at pressures of one atmosphere or below. The scope of the journal includes: 1. Vacuum; original developments in vacuum pumping and instrumentation, vacuum measurement, vacuum gas dynamics, gas-surface interactions, surface treatment for UHV applications and low outgassing, vacuum melting, sintering, and vacuum metrology. Technology and solutions for large-scale facilities (e.g., particle accelerators and fusion devices). New instrumentation ( e.g., detectors and electron microscopes). 2. Plasma science; advances in PVD, CVD, plasma-assisted CVD, ion sources, deposition processes and analysis. 3. Surface science; surface engineering, surface chemistry, surface analysis, crystal growth, ion-surface interactions and etching, nanometer-scale processing, surface modification. 4. Materials science; novel functional or structural materials. Metals, ceramics, and polymers. Experiments, simulations, and modelling for understanding structure-property relationships. Thin films and coatings. Nanostructures and ion implantation.