化工进展

• •    

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. 广西大学化学化工学院,广西石化资源加工及过程强化技术重点实验室
  • 收稿日期:2020-08-21 修回日期:2020-10-11 发布日期:2021-02-26
  • 通讯作者: 孙建华
  • 基金资助:
    广西自然科学基金面上项目;广西科技重大研究项目;广西创新驱动发展专项;崇左市科技项目

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

  • Received:2020-08-21 Revised:2020-10-11 Published:2021-02-26
  • Contact: Jianhua N/ASun

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: 硼掺杂, 四氧化三钴, 气敏特性, 气敏机制

Abstract: Cobalt oxide (Co3O4) is a p-type semiconductor that can be used as a gas-sensing material. Non-metallic boron (B) has the characteristic of absorbing electrons. Doped it with p-type semiconductor gas-sensing material can increase the concentration of hole carrier of the material, thus improving the gas-sensing property of the material. In this paper, B-doped Co3O4 sea urchins microspheres were successfully prepared by low-temperature one-step hydrothermal method with cobalt nitrate hexahydrate (Co(NO3)2·6H2O), boric acid (H3BO3) and urea (Co(NH2)2) as raw materials. The structure of Co3O4 before and after boron doped was characterized by X-ray diffractometer (XRD), scanning electron microscope (SEM), transmission electron microscope (TEM), X-ray photoelectron spectrometer (XPS) and Raman spectrometer (Raman), to explore the influence of boron doped on its gas-sensing performance. The results showed that boron doped significantly enhanced the gas sensing properties of Co3O4. When the doped molar ratio was Co: B= 8:1, the optimal working temperature of B-Co3O4 for 1×105μg/L ethanol was 180℃, and the sensitivity response reached 26.8, which was 4.4 times that of pure Co3O4 under the same conditions. B-Co3O4 is an excellent gas sensing material with good sensitivity, selectivity and stability under low operating temperature.

Key words: boron doped, cobalt oxide, gas-sensing properties, gas sensing mechnism

中图分类号: 

版权所有 © 《化工进展》编辑部


本系统由北京玛格泰克科技发展有限公司设计开发 技术支持:support@magtech.com.cn