Prepration Of Micro-nano NiO And Its Applications On Dye Sensitized Solar Cell And Gas Sensor

NiO is a good p-type functional semiconductor material. It is widely used in the field of gassensor, solar cells, magnetic materials, high-performance catalyst and ceramic dye. Due to theeconomic development and science progress, the environment pollution issues become moreserious. The detection of toxic or low toxic gas has attracted imperative attention. In the field ofgas sensor, NiO get more study owning to the favorable selectivity of volatile organic gas andhigh stability. Additionally, the investigation and development of solar cells is very importantwith the serious power problem. Contrast to inorganic solar cells, the dye sensitized solar cellhave many advantages, such as healthy, cheap, feasible fabrication and stable performance.The preparation method of NiO is simple and stable. In this paper, the NiO sample isprepared with the precipitation, hydrothermal and chemical bath method. We use different kindand quantity of precipitating agent, surface active agent, nickel source and solvent and discussthe affection of product. The materials are characterized by X-Ray Diffraction, ScanningElectron Microscopy, and hermogravimetric and differential scanning calorimetric analysis. Then,we fabricate and test device of DSSC and gas sensor, in which the NiO is prepared fromchemical bath method. This paper have discussed the fabrication method of DSSC, the effect ofdye and test condition on device I-V, and the sensitivity, response recovery property, stability ofgas sensor on ethanol, acetone and nitrogen dioxide.From the investigation, we found that the power conversion efficiency of DSSC device,which is fabricated from scratch method, is changing with different scratch frequency. Firstly, theefficiency is improved with higher scratch frequency. The highest efficiency is0.01446%whenthe frequency is five. Secondly, we immerse the five-scratch DSSC device into0.5mM C343、0.5mM N3、0.5mM Z907dye24h. The test result indicates that the C343is the opticalsensitizer, which the short current density is700A/cm2and the efficiency is0.0270%. Finally,we test the I-V characteristics based on different delay time of power source, which is0ms,5ms,10ms,20ms,50ms,100ms and200ms. The highest Jscand Vocis achieved with the devicewithout delay and is better than the delay device.We fabricate the gas sensor with hollow nest-like NiO powder, which is prepared from the chemical bath deposite method and test the ethanol, acetone and nitrogen dioxide gas. Firstly,the optical working temperature is250℃when the concentration of ethanol is200ppm. Thesensitivity is tested with different concentration on the condition of optical temperature.Increasing the concentration of ethanol, the sensitivity is improved and it is only2.62with2000ppm concentration. Then, the optical working temperature is250-270℃when the acetoneconcentration is200ppm. The sensitivity is tested with different concentration on the conditionof optical temperature. The sensitivity is only1.771with2000ppm acetone and it is similar to1.259with100ppm. This result demonstrates that the sensor is not sensitive to acetone gas.Finally, we use the gas sensor test NO2, and the optical temperature is only25℃when the NO2concentration is10ppm. We decrease the sensor power consumption because of the low testtemperature.