原位生长的α-Fe2O3/ZnO异质纳米棒阵列对乙醇气体的高选择性检测

doi:10.19894/j.issn.1000-0518.200316

摘要/Abstract

摘要： 采用两步溶液法在陶瓷管上原位生长了ZnO纳米棒阵列,然后以ZnO纳米棒为载体,通过水热法在其表面负载α-Fe₂O₃纳米粒子,生成异质α-Fe₂O₃/ZnO复合纳米材料。 α-Fe₂O₃/ZnO纳米棒直径30~80 nm,长1 μm左右,交叉排列形成纳米棒阵列,α-Fe₂O₃纳米粒子粒径约10 nm,均匀分布在ZnO纳米棒表面。将纯ZnO和α-Fe₂O₃/ZnO纳米棒阵列制成气敏元件,测试并对比了2种气敏元件的气敏性能,揭示其气敏机理。结果表明:α-Fe₂O₃纳米粒子的复合显著提高了ZnO纳米棒阵列对乙醇气体的灵敏度和选择性,在工作温度370 ℃时,对100 μL/L乙醇气体的响应值为85.4,是同条件下ZnO器件对乙醇响应值(9.4)的9.1倍,响应时间7 s,最低检出限为0.01 μL/L。相关研究可以应用于痕量乙醇的快速、高灵敏度和高选择性检测。

关键词: 原位生长法, α-Fe₂O₃, ZnO, 纳米棒阵列, 异质结构

Abstract: ZnO nanorod arrays were grown in situ on ceramic tubes by a two-step solution method. Then α-Fe₂O₃ nanoparticles were loaded on the surface of ZnO nanorods via a hydrothermal method to obtain heterogeneous α-Fe₂O₃/ZnO composites. The α-Fe₂O₃/ZnO nanorods are about 30~80 nm in diameter and 1 μm in length, which are cross-arranged to form nanorod arrays. α-Fe₂O₃ nanoparticles with a diameter of about 10 nm distributed on the surface of ZnO nanorods evenly. The gas-sensing properties of the sensors based on pristine ZnO and α-Fe₂O₃/ZnO nanorod arrays were compared, and the gas-sensing mechanism was revealed. The results show that the decoration of α-Fe₂O₃ nanoparticles significantly enhances the sensitivity and selectivity of ZnO nanorod arrays sensors to ethanol at the working temperature of 370 ℃. The response of α-Fe₂O₃/ZnO sensor to 100 μL/L of ethanol is 85.4, which is 9.1 times higher than that of pure ZnO sensor (9.4) determined under the same conditions. The response time is 7 s, and the detection limit is 0.01 μL/L. The work can be applied to the rapid, high sensitivity and selectivity detection for trace ethanol.

Key words: In situ growth, α-Fe₂O₃, ZnO, Nanorod arrays, Heterostructure

中图分类号:

O614.8

隋丽丽, 黄微微, 王平, 徐英明, 程晓丽, 霍丽华, 姜惠烨, 赵冰, 张文治, 王政军, 刘亚红. 原位生长的α-Fe₂O₃/ZnO异质纳米棒阵列对乙醇气体的高选择性检测[J]. 应用化学, 2021, 38(7): 857-865.

SUI Li-Li, HUANG Wei-Wei, WANG Ping, XU Ying-Ming, CHENG Xiao-Li, HUO Li-Hua, JIANG Hui-Ye, ZHAO Bing, ZHANG Wen-Zhi, WANG Zheng-Jun, LIU Ya-Hong. In Situ Deposited Heterogeneous α-Fe₂O₃/ZnO Nanorod Arrays for Highly Selective Detection of Ethanol[J]. Chinese Journal of Applied Chemistry, 2021, 38(7): 857-865.

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原位生长的α-Fe₂O₃/ZnO异质纳米棒阵列对乙醇气体的高选择性检测

In Situ Deposited Heterogeneous α-Fe₂O₃/ZnO Nanorod Arrays for Highly Selective Detection of Ethanol

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