One step hydrothermal synthesis of Fe2O3/KIT-6 nanocomposite as highly responsive humidity sensor

IF 2.5 4区材料科学 Q2 CHEMISTRY, APPLIED

Journal of Porous Materials Pub Date : 2024-05-16 DOI:10.1007/s10934-024-01628-2

Shivani Jakhar, Priya Malik, Supriya Sehrawat, Aryan Boora, Bhavna Rohilla, Sonia Nain, Surender Duhan

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Abstract

This study presents a novel approach for the one-step hydrothermal synthesis of Fe₂O₃/KIT-6 (Korea Advanced Institute of Science and Technology) nanocomposite, demonstrating its remarkable potential as a humidity sensor at room temperature. The nanocomposite, comprised of hydrothermally derived hematite-doped hybrid moieties within a mesostructured siliceous matrix, exhibits outstanding sensitivity to moisture. Through a comprehensive characterization utilizing various techniques including X-ray diffraction, high-resolution transmission electron microscopy, field emission scanning electron microscopy, and energy dispersive X-ray analysis, the ordered mesoporous structure and purity of the synthesized nanocomposite are confirmed. Notably, the incorporation of 5 wt% Fe₂O₃ into the KIT-6 framework via hydrothermal synthesis yields superior sensing properties, characterized by minimal hysteresis, rapid response and recovery times (14s/15s), and exceptional stability within a wide relative humidity (RH) range of 11-98%. These findings pave the way for the development of practical moisture detection devices employing the silica-hematite hybrid nanocomposite as a sensing material in resistive-type sensor configurations.

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一步水热合成作为高响应湿度传感器的 Fe2O3/KIT-6 纳米复合材料

本研究提出了一种一步水热合成 Fe2O3/KIT-6（韩国科学技术院）纳米复合材料的新方法，展示了其作为室温湿度传感器的显著潜力。这种纳米复合材料由水热衍生的掺杂赤铁矿的杂化分子组成，位于中结构硅基质中，对湿度具有出色的灵敏度。通过利用 X 射线衍射、高分辨率透射电子显微镜、场发射扫描电子显微镜和能量色散 X 射线分析等多种技术进行综合表征，证实了合成纳米复合材料的有序介孔结构和纯度。值得注意的是，通过水热合成法在 KIT-6 框架中加入 5 wt% 的 Fe2O3 可产生卓越的传感性能，其特点是滞后极小、响应和恢复时间快（14s/15s），并且在 11-98% 的宽相对湿度（RH）范围内具有超强的稳定性。这些发现为在电阻式传感器配置中使用二氧化硅-赤铁矿杂化纳米复合材料作为传感材料开发实用的湿度检测设备铺平了道路。

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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.