Co_(3)O_(4)纳米棒的制备及其室温气敏性能研究  

Preparation of Co_(3)O_(4) nanorods and their gas-sensitivity performance at room temperature

作　　者：程乐航 林志东[1] CHENG Lehang;LIN Zhidong(Hubei Key Laboratory of Plasma Chemistry and Advanced Materials(Wuhan Institute of Technology),Wuhan 430205,China)

机构地区：[1]等离子体化学与新材料湖北省重点实验室(武汉工程大学),湖北武汉430205

出　　处：《武汉工程大学学报》2024年第5期516-521,共6页Journal of Wuhan Institute of Technology

基　　金：武汉工程大学第十四届研究生教育创新基金(CX2022260)。

摘　　要：以Co(NO)_(3)·6H_(2)O为钴源,CO(NH_(2))_(2)为沉降剂,聚乙烯吡咯烷酮为分散剂,NH4F为前驱体氟源,通过水热法制备了Co_(3)O_(4)纳米棒,并以此制备旁热式气敏元件。X射线衍射和场发射扫描电子显微镜对材料的晶体结构特征、晶粒尺寸、形貌的表征结果显示,Co_(3)O_(4)为多孔纳米棒,其晶粒尺寸为22.2 nm,颗粒尺寸在35~69 nm之间,长约4.7μm,直径范围为220~300 nm,长径比为15.7~21.4。气敏测试结果表明,在80℃下,Co_(3)O_(4)纳米棒气敏元件对0.1 g/L乙醇的灵敏度为465.43,在25℃下仅为2.14。引入0.02 g/L臭氧(O_(3))作为环境气体时,在80℃下气敏元件灵敏度提高到923.16,在25℃下提高到7.64。该气敏元件的恢复过程可采用交替切换O_(3)与测试气体的方式在3 min内完成,实现了室温下元件气敏检测的可重复性。O_(3)的引入,在室温下实现了Co_(3)O_(4)气敏元件对乙醇的气敏检测。Using Co(NO)_(3)·6H_(2)O as the cobalt source,CO(NH_(2))_(2)as the precipitant,polyvinylpyrrolidone as the dispersant,and NH4F as the precursor fluoride source,Co_(3)O_(4)nanorods were prepared via a hydrothermal method,followed by the fabrication of a calorimetric gas sensor.Based on the characterization results from X-ray diffraction and field emission scanning electron microscopy regarding the material's crystal structure,grain size,and morphology,the Co_(3)O_(4)exhibited nanorods were porous with a grain size of 22.2 nm,particle sizes ranging from 35 to 69 nm,a length of approximately 4.7μm,diameter range of 220 to 300 nm,and an aspect ratio between 15.7 and 21.4.Gas sensing tests revealed that at 80℃,the gas sensing element based on the Co_(3)O_(4)nanorods exhibited a sensitivity of 465.43 towards 0.1 g/L ethanol,while at 25℃,it was only 2.14.Introducing 0.02 g/L ozone(O_(3))as ambient gas increased the sensitivity of the gas sensor to 923.16 at 80℃and 7.64 at 25℃,showing enhanced performance.The recovery process of the gas sensor could be achieved within 3 minutes by alternately switching between O_(3)and the test gas,demonstrating the repeatability of gas sensing detection at room temperature.The introduction of O_(3)enabled the Co_(3)O_(4)gas sensor to detect ethanol sensitively at room temperature.

关 键 词：四氧化三钴 气敏性 室温 纳米材料 乙醇 臭氧 

分 类 号：TP212.2[自动化与计算机技术—检测技术与自动化装置]