石墨稀负载p型-n型半导体氧化物及其气敏性能研究
发布时间：2019-05-08 12:17
【摘要】：当今社会对于环境以及健康的关注已越来越高,因此,开发一种高灵敏度、优选择性、可用于多相(气相或液相)的气敏元件用来检测环境污染气体和有毒气体就显得十分必要。在众多气敏元件材料中,一些新型的金属氧化物组合(尤其是p型联合n型金属氧化物半导体)已成为研究的热点。与此同时,石墨烯或化学还原的氧化石墨烯(rGO)作为一种新颖的碳材料,有望应用到气敏元件中,进一步改善气敏元件的性能。本文首先采用了两步法(回流+水热)制备了四氧化三钴-氧化锌-石墨烯三元复合物。在实验过程中,氨水的加入与蒸发对成功将p型半导体四氧化三钴与n型半导体氧化锌同时负载到石墨烯上面起到了关键作用。经过实验条件对比分析,石墨烯片层以及PVP的引入有助于四氧化三钴-氧化锌/石墨烯三元复合物结构与形貌的优化。根据四氧化三钴-氧化锌/石墨烯传感器元件的性能测试发现,该材料可实现多相界面中的气敏响应。四氧化三钴-氧化锌/石墨烯对于气相苯甲醛表现出优秀的气敏性能(对10 ppm苯甲醛达到灵敏度达到6.6)；同时,四氧化三钴-氧化锌/石墨烯对于液相中的苯甲醛同样呈现出良好的响应(灵敏度达到7.98μA·cm-2·mM-1)。实验结果反映出四氧化三钴-氧化锌/石墨烯材料是一种适用于多相界面中检测目标物的新型材料。进一步地,利用一步水热法成功制备了氧化铜-氧化锌/石墨烯三元复合物。通过对材料组分、形貌以及结构的分析发现,该方法实现了将大量纳米尺度的p-n结(CuO-ZnO)引入到了rGO片层上。经过气敏测试发现,该材料对丙酮表现出优秀的响应性能(对10 ppm苯甲醛灵敏度达到9.4)。更重要的是,该三元复合物气敏元件实现了将具有交叉响应现象的乙醇和丙酮气体成功区分。该材料体系优异的气敏特性源于大量纳米尺度的氧化铜-氧化锌p-n结与石墨烯优秀载体之间的协同作用。
[Abstract]:Today's society is paying more and more attention to the environment and health, so developing a kind of high sensitivity, selectivity, Gas sensors which can be used in multiphase (gas phase or liquid phase) are very necessary to detect environmental pollution gases and toxic gases. Among many gas sensor materials, some new metal oxide combinations (especially p-type combined n-type metal oxide semiconductors) have become the focus of research. At the same time graphene or chemically reduced graphene oxide (rGO) as a novel carbon material is expected to be used in gas sensors to further improve the performance of gas sensors. Firstly, the ternary complex of cobalt trioxide-zinc oxide-graphene was prepared by two-step (reflux hydrothermal) method. During the experiment, the addition and evaporation of ammonia played a key role in successfully loading p-type semiconductor cobalt trioxide and n-type semiconductor zinc oxide onto graphene at the same time. Through the comparative analysis of experimental conditions, the introduction of graphene lamellar layer and PVP is helpful to optimize the structure and morphology of Co _ 2O _ 4-ZnO / graphene ternary composites. According to the performance test of cobalt trioxide-zinc oxide / graphene sensor element, it is found that the material can realize the gas sensing response in the multiphase interface. Cobalt trioxide-zinc oxide / graphene exhibited excellent gas sensitivity to gas phase benzaldehyde (sensitivity to 10 ppm benzaldehyde was up to 6.6%). At the same time, cobalt trioxide-zinc oxide / graphene also showed a good response to benzaldehyde in liquid phase (sensitivity up to 7.98 渭 A cm- 2 mM-1). The experimental results show that cobalt trioxide-zinc oxide / graphene material is a new material suitable for the detection of target in multiphase interface. Furthermore, copper oxide-zinc oxide / graphene ternary composites were successfully prepared by one-step hydrothermal method. Through the analysis of the composition, morphology and structure of the material, it is found that a large number of nano-scale CuO-ZnO are introduced into the rGO lamellae by this method. After gas sensing test, it was found that the material showed excellent response to acetone (sensitivity to 10 ppm benzaldehyde reached 9.4). More importantly, the ternary complex gas sensor successfully distinguishes ethanol and acetone gases with cross-response. The excellent gas sensing properties of the material system are due to the synergistic action between a large number of nano-scale Cu _ 2O _ 3-ZnO p _ 2O _ n junctions and graphene excellent carriers.
【学位授予单位】：南京理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN304
本文编号：2471903
[Abstract]:Today's society is paying more and more attention to the environment and health, so developing a kind of high sensitivity, selectivity, Gas sensors which can be used in multiphase (gas phase or liquid phase) are very necessary to detect environmental pollution gases and toxic gases. Among many gas sensor materials, some new metal oxide combinations (especially p-type combined n-type metal oxide semiconductors) have become the focus of research. At the same time graphene or chemically reduced graphene oxide (rGO) as a novel carbon material is expected to be used in gas sensors to further improve the performance of gas sensors. Firstly, the ternary complex of cobalt trioxide-zinc oxide-graphene was prepared by two-step (reflux hydrothermal) method. During the experiment, the addition and evaporation of ammonia played a key role in successfully loading p-type semiconductor cobalt trioxide and n-type semiconductor zinc oxide onto graphene at the same time. Through the comparative analysis of experimental conditions, the introduction of graphene lamellar layer and PVP is helpful to optimize the structure and morphology of Co _ 2O _ 4-ZnO / graphene ternary composites. According to the performance test of cobalt trioxide-zinc oxide / graphene sensor element, it is found that the material can realize the gas sensing response in the multiphase interface. Cobalt trioxide-zinc oxide / graphene exhibited excellent gas sensitivity to gas phase benzaldehyde (sensitivity to 10 ppm benzaldehyde was up to 6.6%). At the same time, cobalt trioxide-zinc oxide / graphene also showed a good response to benzaldehyde in liquid phase (sensitivity up to 7.98 渭 A cm- 2 mM-1). The experimental results show that cobalt trioxide-zinc oxide / graphene material is a new material suitable for the detection of target in multiphase interface. Furthermore, copper oxide-zinc oxide / graphene ternary composites were successfully prepared by one-step hydrothermal method. Through the analysis of the composition, morphology and structure of the material, it is found that a large number of nano-scale CuO-ZnO are introduced into the rGO lamellae by this method. After gas sensing test, it was found that the material showed excellent response to acetone (sensitivity to 10 ppm benzaldehyde reached 9.4). More importantly, the ternary complex gas sensor successfully distinguishes ethanol and acetone gases with cross-response. The excellent gas sensing properties of the material system are due to the synergistic action between a large number of nano-scale Cu _ 2O _ 3-ZnO p _ 2O _ n junctions and graphene excellent carriers.
【学位授予单位】：南京理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN304
【引证文献】
相关会议论文 前1条
1 焦正;;二氧化锡气敏传感器的研究进展[A];第6届辐射研究与辐射工艺学术年会论文集[C];2004年
，本文编号：2471903
本文链接：https://www.wllwen.com/kejilunwen/dianzigongchenglunwen/2471903.html
