三氧化钨/还原氧化石墨烯的制备及其对丙酮的光激发气敏特性  

Preparation of tungsten trioxide/reduced graphene oxide and its gas sensitivity to acetone with UV-photoactivation

作　　者：张恩诚 孙凤云 郭峰旗 孙陆洋 梁衍宇 陆佳梁 ZHANG Encheng;SUN Fengyun;GUO Fengqi;SUN Luyang;LIANG Yanyu;LU Jialiang(Heilongjiang Provincial Key Laboratory of Micro-nano Sensitive Devices and Systems,College of Electronic Engineering,Heilongjiang University,Harbin 150080,China;Engineering College of China University of Petroleum-Beijing at Karamay,Karamay 834000,China)

机构地区：[1]黑龙江大学电子工程学院黑龙江省微纳敏感器件与系统重点实验室,哈尔滨150080 [2]中国石油大学(北京)克拉玛依校区工学院,克拉玛依834000

出　　处：《分析试验室》2025年第3期403-410,共8页Chinese Journal of Analysis Laboratory

基　　金：2020年度黑龙江省属高等学校基本科研业务费资助项目(2020-KYYWF-1000)资助。

摘　　要：以二水合钨酸钠为钨源,硫酸钾为结构导向剂,通过水热法制备三氧化钨(WO_(3))纳米棒,并将其与氧化石墨烯(GO)分散液混合,利用甲醇搅拌还原形成WO_(3)/还原氧化石墨烯(rGO)复合材料WO_(3)/rGO。通过扫描电子显微镜(SEM)、透射电子显微镜(TEM)、 X射线衍射仪(XRD)和X射线光电子能谱(XPS)分析其表面结构、物相组成和化学成分,分别在光激发前后测试其对丙酮的气敏特性。研究了rGO对WO_(3)形貌、结构和丙酮气敏特性的影响,以及光激发对其丙酮气敏特性的作用。结果表明,WO_(3)为六方晶相的纳米棒,GO得到充分还原变成rGO,rGO与WO_(3)纳米棒紧密结合形成复合结构。WO_(3)/rGO复合材料的工作温度随rGO掺杂量的上升而降低,当rGO掺杂量为0.5wt%时丙酮气敏特性最佳。经过光激发后其气敏性能大幅提升,最佳工作温度由328℃降至259℃。在最佳工作温度下,对100 cm^(3)/m^(3)丙酮的灵敏度由413%增至780%,恢复时间由61s降至29s,具有良好的重复性、抗湿性和长期稳定性。最后探讨了WO_(3)/rGO对丙酮的气敏机理以及光激发对其气敏性的影响机制。Tungsten trioxide(WO_(3)) nanorods were prepared by hydrothermal method using sodium tungstate dihydrate as the tungsten source and potassium sulfate as the structure-directing agent.The WO_(3) nanorods were mixed with graphene oxide(GO) dispersion and then reduced with methanol to form the WO_(3)/reduced graphene oxid(rGO) composite.The surface structure,phase composition,and chemical composition of the composite were analyzed by scanning electron microscopy(SEM),transmission electron microscopy(TEM),X-ray diffractometer(XRD),and X-ray photoelectron spectroscopy(XPS).The gas sensitivity of the composite to acetone was tested before and after UV-photoexcitation.The effects of r GO on the morphology,structure,and acetone gas sensitivity of WO_(3),as well as the effect of photoexcitation on its gas sensitivity,were investigated.The results showed that the WO_(3) nanorods had a hexagonal crystal phase,and the GO was fully reduced to r GO.The r GO formed a composite structure with the WO_(3) nanorods.The operating temperature of the WO_(3)/r GO composite decreased with the increase of rGO doping amount.The acetone gas sensitivity was optimal at the rGO doping amount of 0.5 wt%.Moreover,the gas sensitivity was significantly improved after photoexcitation.The optimal operating temperature decreased from 328 ℃ to 259 ℃,the sensitivity to 100 cm^(3)/m^(3) acetone increased from 413% to 780%,and the recovery time decreased from 61 s to 29 s.The composite also exhibited excellent repeatability,humidity resistance,and long-term stability.Finally,the gas sensing mechanism of the WO_(3)/r GO composite to acetone and the effect of photoexcitation on its gas sensitivity were discussed.

关 键 词：三氧化钨/还原氧化石墨烯(WO_(3)/rGO) 光激发 丙酮 气敏特性 

分 类 号：TB383[一般工业技术—材料科学与工程] TP212[自动化与计算机技术—检测技术与自动化装置] TB34[自动化与计算机技术—控制科学与工程]