材料科学
石墨烯
锌
氧化石墨烯纸
氧化物
无机化学
拉曼光谱
化学工程
衍射仪
基质(水族馆)
扫描电子显微镜
纳米技术
化学
光学
复合材料
冶金
海洋学
物理
地质学
工程类
作者
Yang‐Ming Lu,Chi-Feng Tseng,Bing-Yi Lan,Chi‐Ming Hsieh
出处
期刊:Materials
[MDPI AG]
日期:2021-11-17
卷期号:14 (22): 6943-6943
被引量:5
摘要
In this study, hydrogen (H2) and methane (CH4) were used as reactive gases, and chemical vapor deposition (CVD) was used to grow single-layer graphene on a copper foil substrate. The single-layer graphene obtained was transferred to a single-crystal silicon substrate by PMMA transfer technology for the subsequent growth of nano zinc oxide. The characteristics of CVD-deposited graphene were analyzed by a Raman spectrometer, an optical microscope, a four-point probe, and an ultraviolet/visible spectrometer. The sol-gel method was applied to prepare the zinc oxide seed layer film with the spin-coating method, with methanol, zinc acetate, and sodium hydroxide as the precursors for growing ZnO nanostructures. On top of the ZnO seed layer, a one-dimensional zinc oxide nanostructure was grown by a hydrothermal method at 95 °C, using a zinc nitrate and hexamethylenetetramine mixture solution. The characteristics of the nano zinc oxide were analyzed by scanning electron microscope(SEM),x-ray diffractometer(XRD), and Raman spectrometer. The obtained graphene/zinc oxide nano-heterostructure sensor has a sensitivity of 1.06 at a sensing temperature of 205 °C and a concentration of hydrogen as low as 5 ppm, with excellent sensing repeatability. The main reason for this is that the zinc oxide nanostructure has a large specific surface area, and many oxygen vacancy defects exist on its surface. In addition, the P-N heterojunction formed between the n-type zinc oxide and the p-type graphene also contributes to hydrogen sensing.
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