化工新型材料

化工新型材料 ›› 2019, Vol. 47 ›› Issue (8) : 53-57.

新材料与新技术

Nb₂O₅半导体纳米材料形貌调控与气体敏感性能研究

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Morphological control synthesis and gas sensing property of Nb₂O₅ nanomaterial

Bai Yuzhou, Zheng Zhewei, Shi Jianing, Yi Zhehan, Feng Wei, Qin Xixi, Ji Huiming

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Received
2018-03-26
Issue Date	Revised Date
2019-09-04	2018-03-26

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摘要

以NH₄HF₂、氧化铌和氨水为原料,采用水热制备法,通过精确调控Nb前驱体溶液的pH,实现了Nb₂O₅纳米材料的形貌调控,制备得到了六方相Nb₂O₅纳米球及纳米棒材料。采用X射线衍射仪、扫描电子显微镜、比表面积和孔径分布分析仪对Nb₂O₅纳米材料的物相、形貌及比表面积进行了表征分析;采用静态配气法对其进行气敏性能测试,讨论了形貌对Nb₂O₅纳米材料气敏性能的影响。结果表明:Nb₂O₅纳米球与纳米棒均对丙酮表现出良好的选择性。与Nb₂O₅纳米球相比,Nb₂O₅纳米棒表现出更高的气敏响应及更短的响应时间和恢复时间:对 50×10^-6(体积分数,下同)丙酮气体,Nb₂O₅纳米棒的气敏响应可达3.15,响应时间为7s,恢复时间为10s;Nb₂O₅纳米棒对丙酮表现出更好的气敏性能应归因于其具有更大的比表面积。

Abstract

Hexagonal Nb₂O₅ nanomaterials with different morphologies of nanorods and nanoparticles were synthesized using hydrothermal method by preciously adjusting PH value of Nb precursor formed by commercial Nb₂O₅,NH₄HF₂ and ammonia.The crystalline phases,microstructures and specific surface areas of the samples were characterized by X-ray powder diffraction (XRD),field emission scanning electron microscopy (SEM) and Emmett-Teller N₂ adsorption-desorption analyses (BET).Gas sensing properties were tested using side-heating gas sensor based on synthesized Nb₂O₅ under a steady-state condition.The relationship between gas sensing properties and the morphologies of synthesized Nb₂O₅ was discussed.The results indicated that both Nb₂O₅ nanorods and Nb₂O₅ nanoparticles had good selectivity to acetone gas.Compared with Nb₂O₅ nanoparticles,Nb₂O₅ nanorods exhibited better and more stable gas sensing properties.Typically,the gas response of Nb₂O₅ nanorods to 50ppm acetone was 3.15 and response time and recovery time were 7s and 10s,respectively.The enhanced gas sensing properties of Nb₂O₅ nanorods may contributed to a larger surface area it possessed.

关键词

氧化铌 / 气敏 / 纳米棒 / 水热法

Key words

niobium oxide / gas sensitivity / nanorod / hydrothermal method

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Nb₂O₅半导体纳米材料形貌调控与气体敏感性能研究[J]. 化工新型材料, 2019, 47(8): 53-57 DOI:

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