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Enhanced moisture sensing properties of a nanostructured ZnO coated capacitive sensor

机译：增强纳米结构ZnO涂层电容传感器的水分感测性能

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摘要

This work reports the enhancement in sensitivity of a simple and low-cost capacitive moisture sensor using a thin film of zinc oxide (ZnO) nanoparticles on electrodes. The ZnO nanoparticles are systematically characterized using X-ray diffraction, atomic force microscopy, transmission electron microscopy, BET surface area analysis, Fourier transform infrared spectroscopy, and UV-visible and photoluminescence (PL) spectroscopy. The average crystallite size of the ZnO nanoparticles is similar to 16 nm with a surface roughness of similar to 3 nm. Blue emission in the PL spectrum confirms the presence of oxygen vacancy dipoles, which are responsible for enhancing the dielectric properties of the ZnO nanoparticles. The effect of the ZnO nanoparticles on the sensitivity of a moisture sensor cell has been studied using wheat grains with a moisture content from 7% to 25%. An enhancement in sensitivity of 36.4% at 1 MHz and 97.4% at 500 Hz has been observed. A detailed sensing mechanism is proposed and the enhancement in sensing has been explained based on the interaction of ZnO with water vapor and the dielectric behavior of the nanostructured ZnO. The present results establish ZnO as a sensing material for improving the utility of moisture sensors.
机译：这项工作报告了在电极上使用氧化锌（ZnO）纳米颗粒的薄膜的简单和低成本电容式湿度传感器的灵敏度增强。通过X射线衍射，原子力显微镜，透射电子显微镜，BET表面积分析，傅立叶变换红外光谱和UV可见光和光致发光（PL）光谱系统表征ZnO纳米粒子。 ZnO纳米颗粒的平均微晶尺寸类似于16nm，表面粗糙度类似于3nm。 PL光谱中的蓝色发射证实存在氧空位偶极子，其负责增强ZnO纳米颗粒的电介质性质。的ZnO纳米颗粒的上的湿度传感器单元的灵敏度影响的已使用麦粒从7％的水分含量至25％的影响。观察到敏感度为36.4％，500Hz的敏感度为36.4％，97.4％。提出了一种详细的感测机构和在感测所述增强已经说明基于ZnO与水蒸汽和纳米结构的ZnO的介电行为的相互作用。本结果建立ZnO作为改善湿度传感器效用的传感材料。

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  • 来源
    《RSC Advances》 |2018年第7期|共7页
  • 作者

    Singh Harinder; Kumar Akshay; Bansod Babankumar S.; Singh Tejbir; Thakur Anup; Singh Tarandip; Sharma Jeewan;

  • 作者单位

    Sri Guru Granth Sahib World Univ Dept Nanotechnol Fatehgarh Sahib 140407 India;

    Sri Guru Granth Sahib World Univ Dept Nanotechnol Fatehgarh Sahib 140407 India;

    Cent Sci Instruments Org Chandigarh 160030 India;

    Sri Guru Granth Sahib World Univ Dept Phys Fatehgarh Sahib 140407 India;

    Punjabi Univ Dept Basic &

    Appl Sci Patiala 147002 Punjab India;

    Sri Guru Granth Sahib World Univ Dept Elect Engn Fatehgarh Sahib 140407 India;

    Sri Guru Granth Sahib World Univ Dept Nanotechnol Fatehgarh Sahib 140407 India;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 化学;
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