共查询到20条相似文献,搜索用时 93 毫秒
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采用两步法制备氧化锌纳米片/聚苯胺(ZnO/PANI)复合材料,首先制备ZnO纳米片,然后以此为载体,通过苯胺单体的原位聚合得到最终产物。通过XRD、FTIR、FESEM、氮气吸附-脱附和紫外-可见漫反射对合成材料进行表征,研究了其紫外激发室温气敏性能,分析了可能的紫外激发气敏机理。结果表明,在紫外光激发下,ZnO/PANI复合材料实现了室温检测,乙醇浓度100×10~(-6)(体积分数)时,灵敏度较高达到17.6,响应和恢复时间均在30 s以内。 相似文献
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对几种工艺结构的氧化物半导体气敏元件进行对比,阐述了气敏元件的结构和工艺对气敏元件性能参数的影响。并介绍一种新型结构的氧化物半导体气敏元件。 相似文献
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对气体传感器性能的检测,将直接影响到传感器的质量,应用和发展,只有把气体传感器的各项参数精确的测试清楚,才能可靠的发挥其作用,该装置通过配气系统和计算机测试系统对气敏元件的各项参数进行检测,从而大大提高了检测气敏元件的精密度。 相似文献
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The controllable growth processes of ZnO nanowires by evaporation of metal zinc with high purity and its luminescence properties have been investigated in detail. Firstly, the power of ZnO nanowires with high yield and homogeneous dimension was synthesized using the special quartz boat at 600 °C. Then, the oriented ZnO nanowires with about 20 nm diameter were synthesized by using a 90 nm-thick layer of ZnO nanocrystals on the Si substrate as the seed layer. Both fabrication processes are repeatable and no catalysts are necessary. Finally, photoluminescence (PL) spectroscopy for ZnO nanowires using an He-Cd laser line of 325 nm as the excitation source were measured at room temperature and both samples showed a sharp strong ultraviolet (UV) near-band edge emission. However, different UV peak positions (385 nm for ZnO nanowire powder, 377 nm for ZnO nanowire array) can be observed. The size confinement effect for excitons and carriers is proposed to explain the blue shift of the near-band edge emission with decreasing size and the native defects are responsible for the green emission. 相似文献
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AlF3-MgF2-SiO2系低温共烧氧氟玻璃陶瓷性能研究 总被引:1,自引:1,他引:0
制备了AlF3-MgF2-SiO2系低温共烧氧氟玻璃陶瓷材料,用XRD、SEM和阻抗分析仪等分析其烧结特性、显微结构、介电性能以及与Ag电极浆料共烧等性能。结果表明:该材料可以在900℃烧结致密化,烧成后的样品具有低的介电常数(6.2)和介质损耗(<0.002)、较低的热膨胀系数(7.4×10–6/K)、较高的弯曲强度(220 MPa)和热导率[2.4 W/(m.K)],能够与Ag电极浆料共烧,是一种很有应用前景的低温共烧陶瓷基板和无源集成介质材料。 相似文献
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The flower-like ZnO (F-ZnO) synthesized by a solution approach was hydrothermally functionalized with Au nanoparticles (Au NPs). The Au coverage on the surface of F-ZnO was controllable by adjusting the Au concentration of the precursor. The gas sensing performance of the formed hybrid was systematically investigated. A Au-functionalized F-ZnO hybrid structure, combining excellent catalytic activity of Au NPs and efficient charge-transfer layer at the Au/ZnO interface, was demonstrated to possess the superior response to pristine ZnO. The optimal Au loading is 6 wt%, and its gas response is nearly 17 times higher than that of pristine ZnO and ~2.5 times higher than that of commercial ZnO functionalized with 6 wt% Au. Such a hybrid structure exhibits a great potential for gas sensing applications. 相似文献
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把BiGaO3作为第三组元引入BiScO3-PbTiO3(BS-PT)体系,用氧化物合成法制备了0.155BiGaO3-(0.845-x)BiScO3-xPbTiO3(BGSPTx,x为0.54~0.58)压电陶瓷。XRD分析表明,BGSPTx具有钙钛矿结构,但同时存在微量的富铋相。三方–四方准同型相界(MPB)位于x为0.56附近。在MPB附近,BGSPTx陶瓷的d33,kp和Pr都达到最大值,分别为180pC/N,30%和18.5×10–6C/cm2。εr-t特性曲线测试表明,陶瓷在MPB附近居里温度tC高达494℃。 相似文献