NiO-WO3纳米立方块的制备及在甲醛检测中的应用

doi:10.11944/j.issn.1000-0518.2020.10.200059

摘要/Abstract

摘要： 采用一步水热合成法合成NiO-WO₃纳米立方块,以WO₃为主体,引入p型半导体NiO构建NiO-WO₃ p-n异质结。通过扫描电子显微镜(SEM)和X射线衍射仪(XRD)对相应的微观结构进行了分析表征,表明产物为单斜相WO₃,由尺寸大小均匀的纳米立方块组成,平均粒径100 nm左右,引入NiO后WO₃纳米立方块的形貌基本保持不变。将NiO-WO₃纳米立方块制成气敏元件并测验了其对甲醛气体的敏感特性。气敏测试结果表明,构建NiO-WO₃异质结可显著地提高WO₃传感器对甲醛气体的敏感特性。特别是5％NiO-WO₃异质结纳米立方块结构传感器,其在200 ℃下对0.134 mg/L甲醛的灵敏度达到18.5,且具有快速响应-恢复特性、良好的稳定性及对甲醛的良好选择性。传感器性能提升的原因主是界面处p-n异质结的形成和NiO的高催化活性。

关键词: NiO-WO₃, 纳米立方块, 甲醛检测

Abstract: The NiO-WO₃ nanocubes are synthesized by hydrothermal synthesis. The p-n junction is formed by introducing p-type NiO to WO₃ nanocubes. The products are characterized by XRD and SEM and have cube-like structures which are successfully retained after introducing NiO. The formaldehyde gas sensing properties are systematically investigated between the pure and NiO-WO₃ nanocubes. The NiO-WO₃ nanocube sensor exhibits enhanced response and lower operating temperature compared to the pure one. Especially, the 5% molar fraction of NiO-WO₃ nanocube sensor exhibits the excellent sensing properties. Its highest response to 0.134 mg/L formaldehyde gas is 18.5 at 200 ℃. In addition, fast response and recovery, good reproducibility and stability, and good selectivity to formaldehyde are also obtained, indicating the formation of NiO-WO₃ heterojunction in favor of improving the sensing properties. Meanwhile, the sensing enhancement mechanism of the NiO-WO₃ nanocubes is also discussed, which is related to the formation of hetrojunction at interface and the high catalytic activity of NiO.

Key words: NiO-WO₃, nanocubes, formaldehyde detection

伞晓广, 巩晓辉, 陆一鸣, 乔桐桐, 游宇, 孟丹. NiO-WO₃纳米立方块的制备及在甲醛检测中的应用[J]. 应用化学, 2020, 37(10): 1203-1210.

SAN Xiaoguang, GONG Xiaohui, LU Yiming, QIAO Tongtong, YOU Yu, MENG Dan. Synthesis of NiO-WO₃ Nanocubes and Their Application in Detecting Formaldehyde[J]. Chinese Journal of Applied Chemistry, 2020, 37(10): 1203-1210.

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NiO-WO₃纳米立方块的制备及在甲醛检测中的应用

Synthesis of NiO-WO₃ Nanocubes and Their Application in Detecting Formaldehyde

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