用于H2S传感的掺钆CeO2气体传感器

IF 1.1 4区材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY

Korean Journal of Metals and Materials Pub Date : 2023-06-05 DOI:10.3365/kjmm.2023.61.6.414

C. Jin, Sangwoo Kim, Dong Eung Kim, A. Mirzaei, J. Roh, Sun-Woo Choi, Myung Sik Choi

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引用次数: 0

摘要

硫化氢（H2S）气体具有易燃性，是最有毒、最危险的气体之一。即使是很小的浓度也可能对人类致命。在此，我们研究了商业纯氧化铈（CeO2）和掺钆（Gd）的CeO2（GDC）纳米颗粒的H2S气敏特性。首先，使用包括X射线光电子能谱、透射电子显微镜和X射线衍射在内的各种方法对传感材料进行了良好的表征，以分别深入了解其化学成分、形态、相和结晶度。在下一步中，使用顶部电极（Au/Ti）配置制造气体传感器。初步的H2S气体传感研究表明，在350°C下，GDC气体传感器对H2S气体的气体响应优于原始CeO2气体传感器。原始CeO2气体传感器对20ppm H2S气体的响应为1.542，而GDC气体传感器对上述H2S浓度的响应为3.489。此外，在C2H5OH、C7H8和NH3气体中，GDC传感器对H2S气体表现出良好的选择性。此外，我们还研究了传感器在高达60%的相对湿度下的响应。GDC气体传感器对H2S气体的增强响应主要与CeO2中Gd掺杂导致的氧缺陷的形成有关。此外，对H2S的良好选择性与传感温度、H2S相对于其他气体的较高反应性以及H-SH的小键能有关。这项研究证明了Gd掺杂增强CeO2的H2S气体传感特性的良好能力，可应用于其他基于半导体金属氧化物的类似系统。

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Gadolinium-Doped CeO2 Gas Sensor for H2S Sensing

Dihydrogen sulfide (H₂S) gas has a flammable nature and is one of the most toxic and dangerous gases. Even small concentrations can be fatal to humans. Herein, we investigated the H₂S gas-sensing features of commercial pristine cerium oxide (CeO₂ ) and gadolinium (Gd)-doped CeO₂ (GDC) nanoparticles. First, the sensing materials were well-characterized using various methods including X-ray photoelectron spectroscopy, transmission electron microscopy and X-ray diffraction to gain insight into their chemical composition, morphology, phases, and crystallinity, respectively. In the next step, gas sensors were fabricated using a top electrode (Au/Ti) configuration. Preliminary H₂S-gas-sensing studies revealed that GDC gas sensor had a superior gas response to H₂S gas than the pristine CeO₂ gas sensor at 350°C. The responses of the pristine CeO₂ gas sensor to 20 ppm H₂S gas was 1.542, while the response of the GDC gas sensor to the aforementioned H₂S concentration was 3.489. In addition, the GDC sensor exhibited good selectivity to H₂S gas among C₂H₅OH, C₇H₈ and NH₃ gases. Also, we investigated the response of the sensor in up to 60% relative humidity. The enhanced response of the GDC gas sensor to H₂S gas was mainly related to the formation of oxygen defects as a result of Gd-doping in CeO₂ . Also, good selectivity to H₂S was related to the sensing temperature, the higher reactivity of H₂S relative to other gases and the small bond energy of H-SH. This study demonstrates the promising ability of Gd-doping to enhance the H₂S gas-sensing characteristics of CeO₂ , which can be applied to other similar systems based on semiconducting metal oxides.

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来源期刊

Korean Journal of Metals and Materials MATERIALS SCIENCE, MULTIDISCIPLINARY-METALLURGY & METALLURGICAL ENGINEERING

CiteScore

1.80

自引率

58.30%

发文量

100

审稿时长

4-8 weeks

期刊介绍： The Korean Journal of Metals and Materials is a representative Korean-language journal of the Korean Institute of Metals and Materials (KIM); it publishes domestic and foreign academic papers related to metals and materials, in abroad range of fields from metals and materials to nano-materials, biomaterials, functional materials, energy materials, and new materials, and its official ISO designation is Korean J. Met. Mater.