Chemical Industry and Engineering Progress ›› 2021, Vol. 40 ›› Issue (3): 1537-1544.DOI: 10.16085/j.issn.1000-6613.2020-1671

• Materials science and technology • Previous Articles     Next Articles

Preparation of boron doped Co3O4 sea urchin-like microspheres and its gas sensing enhancement mechanism for ethanol

SUN Shu(), SUN Lixia, WEN Xiaohui, ZHANG Haowei, LIAO Dankui, SUN Jianhua()   

  1. Guangxi Key Laboratory of Petrochemical Resource Processing and Process Intensification Technology, School of Chemistry and Chemical Engineering, Guangxi University, Nanning 350004, Guangxi, China
  • Received:2020-08-21 Online:2021-03-17 Published:2021-03-05
  • Contact: SUN Jianhua

硼掺杂Co3O4海胆状微球的制备及其乙醇气敏强化机制

孙舒(), 孙丽霞, 文晓慧, 张郝为, 廖丹葵, 孙建华()   

  1. 广西石化资源加工及过程强化技术重点实验室,广西大学化学化工学院,广西 南宁 530004
  • 通讯作者: 孙建华
  • 作者简介:孙舒(1995—),女,硕士研究生,研究气敏传感材料。E-mail:937289227@qq.com
  • 基金资助:
    国家自然科学基金青年项目(52002088);广西自然科学基金面上项目(2018GXNSFAA294001);广西科技重大专项项目(桂科AB18126008);崇左市科技项目(FA2018002)

Abstract:

Cobalt oxide (Co3O4) is a typical p-type semiconductor and can be used as a gas sensing material. The gas-sensing properties of Co3O4 can be improved by doping non-metallic boron (B) due to the absorbing electron characteristics of boron(B) that makes hole concentration of Co3O4 increase. In this paper, B-doped Co3O4 microspheres with sea urchin morphology were successfully prepared by low-temperature one-step hydrothermal method using cobalt nitrate hexahydrate [Co(NO3)2·6H2O], boric acid (H3BO3) and urea [Co(NH2)2] as raw materials. The structures and morphologies of Co3O4 before and after boron doping were characterized by various spectra, and the gas sensing properties to ethanol were examined. The results show that boron doping significantly enhances the gas sensing properties of Co3O4. When the doped molar ratio is Co∶B=8∶1, the doped Co3O4 not only exhibits high response of 26.8 in 1×105μg/L ethanol, which is 4.4 times higher than that of pure Co3O4, but also good selectivity and stability at the optimal working temperature of 180℃. So, the B doped Co3O4 is a promising gas sensing material for detection of VOCs.

Key words: cobalt oxide, boron doping, ethanol sensor, gas-sensing properties, gas sensing mechanism

摘要:

四氧化三钴(Co3O4)是一种p型半导体,可作为气体传感材料。非金属硼(B)具有吸电子特性,将其与p型半导体气敏材料进行掺杂,可增加材料的空穴载流子浓度,从而提高材料的气敏性能。本文以六水合硝酸钴[Co(NO3)2·6H2O]、硼酸(H3BO3)和尿素[CO(NH2)2]为原料,采用低温一步水热法成功制备了B掺杂Co3O4海胆状微球。通过X射线衍射仪(XRD)、扫描电镜(SEM)、透射电镜(TEM)、X射线光电子能谱仪(XPS)和拉曼光谱仪(Raman)对掺杂B前后的Co3O4进行结构表征,探究B掺杂对其气敏性能的影响。结果表明:B掺杂对Co3O4材料的气敏性能有明显的强化作用。当掺杂摩尔比为Co∶B=8∶1时,B-Co3O4对1×105μg/L乙醇的最佳工作温度为180℃,灵敏度响应达到26.8,是相同条件下纯Co3O4的4.4倍。B-Co3O4在较低的工作温度下,具有良好的灵敏度、选择性和稳定性,是一种性能优良的气敏材料。

关键词: 四氧化三钴, 硼掺杂, 乙醇传感, 气敏特性, 气敏机制

CLC Number: 

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