Gaidan Ibrahim, Brabazon Dermot, Ahad Inam Ul
Faculty of Engineering, Electrical & Electronics Eng. Department, Sirte University, Sirte, Libya.
Advanced Processing Technology Research Centre, Dublin City University, Dublin 9, Ireland.
Sensors (Basel). 2017 Aug 31;17(9):1995. doi: 10.3390/s17091995.
In this study, three different compositions of ZnO and TiO₂ powders were cold compressed and then heated at 1250 °C for five hours. The samples were ground to powder form. The powders were mixed with 5 wt % of polyvinyl butyral (PVB) as binder and 1.5 wt % carbon black and ethylene-glyco-lmono-butyl-ether as a solvent to form screen-printed pastes. The prepared pastes were screen printed on the top of alumina substrates containing arrays of three copper electrodes. The three fabricated sensors were tested to detect propanol at room temperature at two different concentration ranges. The first concentration range was from 500 to 3000 ppm while the second concentration range was from 2500 to 5000 ppm, with testing taking place in steps of 500 ppm. The response of the sensors was found to increase monotonically in response to the increment in the propanol concentration. The surface morphology and chemical composition of the prepared samples were characterized by Scanning Electron Microscopy (SEM) and X-Ray Diffraction (XRD). The sensors displayed good sensitivity to propanol vapors at room temperature. Operation under room-temperature conditions make these sensors novel, as other metal oxide sensors operate only at high temperature.
在本研究中，将三种不同成分的ZnO和TiO₂粉末进行冷压，然后在1250℃下加热5小时。将样品研磨成粉末形式。将这些粉末与5 wt%的聚乙烯醇缩丁醛（PVB）作为粘结剂、1.5 wt%的炭黑以及乙二醇单丁醚作为溶剂混合，以形成丝网印刷浆料。将制备好的浆料丝网印刷在含有三个铜电极阵列的氧化铝基板顶部。对制作的三个传感器进行测试，以在室温下检测两种不同浓度范围内的丙醇。第一个浓度范围是500至3000 ppm，而第二个浓度范围是2500至5000 ppm，测试以500 ppm的步长进行。发现传感器的响应随着丙醇浓度的增加而单调增加。通过扫描电子显微镜（SEM）和X射线衍射（XRD）对制备样品的表面形态和化学成分进行了表征。这些传感器在室温下对丙醇蒸汽表现出良好的灵敏度。在室温条件下运行使这些传感器具有新颖性，因为其他金属氧化物传感器仅在高温下运行。
