Highly-enhanced gas-sensing performance of metal-doped In2O3 microtubes from acceptor doping and double surface adsorption

IF 3.9 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Materials Science and Engineering B-advanced Functional Solid-state Materials Pub Date : 2024-11-01 DOI:10.1016/j.mseb.2024.117784

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Abstract

The different valent metal-doping is a feasible and convenient way to adjust the microstructures and electron concentration of In₂O₃ gas sensors. In this paper, the different valence metals (Zn²⁺, Sb³⁺, Zr⁴⁺ and Nb⁵⁺) are doped into MIL-68 (In) metal–organic frameworks (MOFs) by solvothermal method, and then In₂O₃ and metal-doped In₂O₃ microtubes are obtained by pyrolysis MIL-68 MOFs. All samples exhibit the similar microtubular structures, indicating oxygen adsorption on both inner and outer surface. The average grain size of metal-doped In₂O₃ microtubes decreases a little while the specific surface area increases greatly. Metal-doping greatly affects the formaldehyde gas-sensing performance, and Zn²⁺-doped In₂O₃ sensor presents the highest response value (188.56), shortest response/recovery times and excellent selectivity to formaldehyde gas at 210 ℃. Compared the microstructural and gas-sensing parameters of In₂O₃ sensor, the specific surface area and oxygen vacancies of metal-doped In₂O₃ sensors enhance the surface

O^{-}

. Moreover, acceptor Zn²⁺-doping directly extracts electrons from conduction band of Zn²⁺-doped In₂O₃ sensor, which greatly increases the resistance in air and the thickness of electron deletion layer for Zn²⁺-doped In₂O₃ sensor.

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掺杂金属的 In2O3 微管从受体掺杂和双表面吸附中获得高度增强的气体传感性能

掺杂不同价态的金属是调整 In2O3 气体传感器微结构和电子浓度的一种可行而便捷的方法。本文采用溶热法将不同价态的金属（Zn2+、Sb3+、Zr4+和Nb5+）掺杂到MIL-68（In）金属有机框架（MOFs）中，然后通过热解MIL-68 MOFs得到In2O3和金属掺杂的In2O3微管。所有样品都表现出相似的微管结构，表明内外表面都吸附了氧气。掺杂金属的 In2O3 微管的平均粒度略有减小，而比表面积却大大增加。金属掺杂对甲醛气体传感性能有很大影响，掺杂 Zn2+ 的 In2O3 传感器在 210 ℃ 下具有最高的响应值（188.56）、最短的响应/恢复时间和对甲醛气体的良好选择性。对比 In2O3 传感器的微观结构和气体传感参数，掺金属 In2O3 传感器的比表面积和氧空位提高了表面 O-。此外，受体 Zn2+ 的掺杂直接从掺杂 Zn2+ 的 In2O3 传感器的导带中提取电子，这大大增加了 Zn2+ 掺杂 In2O3 传感器在空气中的电阻和电子删除层的厚度。

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来源期刊

Materials Science and Engineering B-advanced Functional Solid-state Materials 工程技术-材料科学：综合

CiteScore

5.60

自引率

2.80%

发文量

481

审稿时长

3.5 months

期刊介绍： The journal provides an international medium for the publication of theoretical and experimental studies and reviews related to the electronic, electrochemical, ionic, magnetic, optical, and biosensing properties of solid state materials in bulk, thin film and particulate forms. Papers dealing with synthesis, processing, characterization, structure, physical properties and computational aspects of nano-crystalline, crystalline, amorphous and glassy forms of ceramics, semiconductors, layered insertion compounds, low-dimensional compounds and systems, fast-ion conductors, polymers and dielectrics are viewed as suitable for publication. Articles focused on nano-structured aspects of these advanced solid-state materials will also be considered suitable.