摘要
四氧化三钴(Co_(3)O_(4))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(NO_(3))2·6H2_(O)]、硼酸(H_(3)BO_(3))和尿素[CO(NH_(2))_(2)]为原料,采用低温一步水热法成功制备了B掺杂Co_(3)O_(4)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Co_(3)O_(4)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Co_(3)O_(4)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-Co_(3)O_(4)对1×10^(5)μg/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Co_(3)O_(4)的4.4倍。B-Co_(3)O_(4)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。
Cobalt oxide(Co_(3)O_(4))is a typical p-type semiconductor and can be used as a gas sensing material.The gas-sensing properties of Co_(3)O_(4)can be improved by doping non-metallic boron(B)due to the absorbing electron characteristics of boron(B)that makes hole concentration of Co_(3)O_(4)increase.In this paper,B-doped Co_(3)O_(4)microspheres with sea urchin morphology were successfully prepared by lowtemperature one-step hydrothermal method using cobalt nitrate hexahydrate[Co(NO_(3))2·6H_(2)O],boric acid(H_(3)BO_(3))and urea[Co(NH_(2))_(2)]as raw materials.The structures and morphologies of Co_(3)O_(4)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 Co_(3)O_(4).When the doped molar ratio is Co∶B=8∶1,the doped Co_(3)O_(4)not only exhibits high response of 26.8 in 1×10^(5)μg/L ethanol,which is 4.4 times higher than that of pure Co_(3)O_(4),but also good selectivity and stability at the optimal working temperature of 180℃.So,the B doped Co_(3)O_(4)is a promising gas sensing material for detection of VOCs.
作者
孙舒
孙丽霞
文晓慧
张郝为
廖丹葵
孙建华
SUN Shu;SUN Lixia;WEN Xiaohui;ZHANG Haowei;LIAO Dankui;SUN Jianhua(Guangxi Key Laboratory of Petrochemical Resource Processing and Process Intensification Technology,School of Chemistry and Chemical Engineering,Guangxi University,Nanning 350004,Guangxi,China)
出处
《化工进展》
EI
CAS
CSCD
北大核心
2021年第3期1537-1544,共8页
Chemical Industry and Engineering Progress
基金
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、桂科AA19254022)
崇左市科技项目(FA2018002、FA2019003、FA2020003)。
关键词
四氧化三钴
硼掺杂
乙醇传感
气敏特性
气敏机制
cobalt oxide
boron doping
ethanol sensor
gas-sensing properties
gas sensing mechanism
