采用简单的一步式水热法制备了颗粒状纳米ZnO,以纳米ZnO为基体材料通过球磨法进行碳纳米管(CNTs)掺杂制备CNTs-ZnO复合材料,研究了改变CNTs含量(1%、3%、5%)对ZnO传感器气敏性能的影响。结果表明:通过CNTs掺杂,ZnO传感器的灵敏度得到大幅度提高且工作温度呈现降低的趋势,其中3%-CNTs/ZnO复合材料在最佳工作温度360℃下对乙醇浓度为100×10-6的响应值(S=Ra/Rg)为98.329,是纯纳米ZnO的2.5倍。优异的性能主要归因于CNTs的掺杂增加了CNTs-ZnO复合材料的比表面积,而且可以促进CNTs在ZnO界面形成p-n异质结。
Nano ZnO particles were prepared by a simple one-step hydrothermal method.CNTs-ZnO composites were further prepared by ball milling method with nano ZnO as matrix material.The effects of CNTs content (1wt%,3wt%,5wt%) on gas sensing properties of ZnO sensor were studied.The results showed that the sensitivity of ZnO sensor was greatly improved and the working temperature decreased by doping CNTs.Among them,the response value (S=Ra/Rg) of 3%-CNTs/ZnO composite material to 100×10-6 of ethanol,at the best working temperature of 360℃,was 98.329,which was 2.5 times that of pure nano-ZnO.The excellent properties were mainly attributed to the fact that the doping of CNTs increased the specific surface area of CNTs ZnO composites and promoted the formation of p-n heterojunction between CNTs and ZnO.
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