Hydrothermal synthesis and gas sensing properties of lamellar Nickel Titanate

IF 5.8 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Journal of Alloys and Compounds Pub Date : 2024-11-14 DOI:10.1016/j.jallcom.2024.177564

Tianqing Cai, Rabigul Tursun, Xiaoyu Wang, Qijun He

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引用次数: 0

Abstract

Synthesizing pure nickel titanate using the hydrothermal method has posed a significant challenge. In this study, single phase lamellar structured nickel titanate were successfully synthesized via the hydrothermal method. X-ray diffraction spectroscopy (XRD), field emission scanning electron microscopy (FE-SEM), X-ray photoelectron spectroscopy (XPS), Raman spectroscopy (RAMAN), high-resolution transmission electron microscopy (HRTEM), Fourier-transform infrared spectroscopy (FT-IR), and Brunauer-Emmett-Teller (BET) methods were employed to investigated the effects of varying hydrothermal durations and pH values on the sample's structure and gas-sensing performance. Results indicates that hydrothermal duration of 20 h and pH of 13 yielded sample showed single ilmenite phase, and highly sensitive ammonia (NH₃) detection capability. At room temperature, the sample exhibited a remarkable response of 17.92 k% to 500 ppm NH₃, with a response time of 13.8 s and a recovery time of 2.4 s, and a theoretical detection limit of 3.7 ppm. The exceptional sensing performance can be attributed to lamellar structure that well-exposed surface of the pore, which can absorb more oxygen molecules and provide additional active sites for redox reactions between target gas molecules and adsorbed oxygen. The outcome of this work might provide strategy for the design of novel sensing materials.

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片状钛酸镍的水热合成和气体传感特性

利用水热法合成纯钛酸镍是一项重大挑战。本研究通过水热法成功合成了单相片状结构的钛酸镍。研究采用了 X 射线衍射光谱 (XRD)、场发射扫描电子显微镜 (FE-SEM)、X 射线光电子能谱 (XPS)、拉曼光谱 (RAMAN)、高分辨率透射电子显微镜 (HRTEM)、傅立叶变换红外光谱 (FT-IR) 和布鲁瑙尔-艾美特-泰勒 (BET) 方法，考察了不同水热持续时间和 pH 值对样品结构和气体传感性能的影响。结果表明，水热持续时间为 20 小时、pH 值为 13 的样品呈现单一钛铁矿相，具有高灵敏度的氨气（NH3）检测能力。在室温下，样品对 500 ppm NH3 的响应为 17.92 k%，响应时间为 13.8 s，恢复时间为 2.4 s，理论检测限为 3.7 ppm。这种优异的传感性能归功于孔隙表面暴露良好的片状结构，这种结构可以吸收更多的氧分子，并为目标气体分子与吸附氧之间的氧化还原反应提供额外的活性位点。这项工作的成果可为新型传感材料的设计提供策略。

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 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.