Preparation of Pt-modified In2O3 nanobundles with enhanced formaldehyde gas sensing performance

IF 2.5 4区材料科学 Q2 CHEMISTRY, APPLIED

Journal of Porous Materials Pub Date : 2024-07-17 DOI:10.1007/s10934-024-01659-9

Bin Yang, Xiaodong Wang, Yan Wang, Guiyun Yi, Juanmei Zhou, Yaping Zhang

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Abstract

Recently, element doping has become an effective strategy to improve the gas sensing properties of In₂O₃-based materials by adjusting their electronic structures. Herein, Pt-modified In₂O₃ nanobundles, composed of nanofibers, were prepared using a simple hydrothermal method. The dispersion of Pt nanoparticles on the In₂O₃ surface was achieved through an in-situ reduction process. High-resolution TEM images reveal that the In₂O₃ nanofibers possess an average diameter of 30 nm. Brunauer-Emmett-Teller(BET) indicates that the Pt modification can increase the specific surface area. XPS indicates that the introduction of Platinum(Pt) nanoparticles can both increase the oxygen vacancy ratio, and facilitate to trap the electrons, as a result of improving the sensing performance. The gas sensing tests demonstrate that the Pt decorated In₂O₃ nanobundles show excellent sensitivity (5.12 of 100 ppm) and selectivity towards formaldehyde at the optimized temperature of 180 °C. This shows that the decoration of Pt nanoparticles can lower the optimized working temperature and shorten the response/recovery times, of which the enhanced performance can be attributed to electronic and chemical sensitization.

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制备具有更强甲醛气体传感性能的 Pt 改性 In2O3 纳米束

最近，元素掺杂已成为通过调整 In2O3 基材料的电子结构来改善其气体传感性能的一种有效策略。本文采用简单的水热法制备了由纳米纤维组成的铂修饰 In2O3 纳米束。铂纳米颗粒通过原位还原过程分散在 In2O3 表面。高分辨率 TEM 图像显示，In2O3 纳米纤维的平均直径为 30 纳米。布鲁纳-艾美特-泰勒（BET）分析表明，铂改性可以增加比表面积。XPS 表明，铂（Pt）纳米粒子的引入既能增加氧空位率，又能促进电子捕获，从而提高传感性能。气体传感测试表明，铂装饰的 In2O3 纳米束在 180 °C 的最佳温度下对甲醛具有极佳的灵敏度（5.12 of 100 ppm）和选择性。这表明，铂纳米粒子的装饰可以降低优化工作温度，缩短响应/恢复时间，而性能的提高可归因于电子和化学敏化。

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

Journal of Porous Materials 工程技术-材料科学：综合

CiteScore

4.80

自引率

7.70%

发文量

203

审稿时长

2.6 months

期刊介绍： The Journal of Porous Materials is an interdisciplinary and international periodical devoted to all types of porous materials. Its aim is the rapid publication of high quality, peer-reviewed papers focused on the synthesis, processing, characterization and property evaluation of all porous materials. The objective is to establish a unique journal that will serve as a principal means of communication for the growing interdisciplinary field of porous materials. Porous materials include microporous materials with 50 nm pores. Examples of microporous materials are natural and synthetic molecular sieves, cationic and anionic clays, pillared clays, tobermorites, pillared Zr and Ti phosphates, spherosilicates, carbons, porous polymers, xerogels, etc. Mesoporous materials include synthetic molecular sieves, xerogels, aerogels, glasses, glass ceramics, porous polymers, etc.; while macroporous materials include ceramics, glass ceramics, porous polymers, aerogels, cement, etc. The porous materials can be crystalline, semicrystalline or noncrystalline, or combinations thereof. They can also be either organic, inorganic, or their composites. The overall objective of the journal is the establishment of one main forum covering the basic and applied aspects of all porous materials.