帮我写一篇以氧化铒微球的制备及其湿敏性能的研究为题的论文

摘要：本文研究了氧化铒微球的制备及其湿敏性能。通过电解法制备氧化铒微球，并采用X射线衍射仪(XRD)、扫描电子显微镜(SEM)和N2吸附-脱附仪对样品进行表征，测试其湿敏性能。实验结果表明，当水分子与氧化铒微球发生相互作用时，其N2吸脱附实测值随水分子的增加而升高。此外，随着温度的升高，N2吸脱附实测值也会随之升高。本文为进一步开发氧化物材料在传感、储存、净化等方向上的应用奠定了基础。 Introduction Rhenium oxide (ReO3) is a kind of metal oxide with high dielectric constant, good thermal stability and chemical stability. It has been widely used in the fields of electro-optic materials, optical storage materials, photocatalysts and humidity sensors. In recent years, due to its excellent properties, ReO3 has attracted more and more attention from researchers in the field of materials science. In this paper, we study the preparation of ReO3 microspheres and their humidity sensing properties. The prepared samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and N2 adsorption/desorption isotherms to study their humidity sensing properties. The results show that when water molecules interact with ReO3 microspheres, the measured value of N2 adsorption/desorption increases with the increase of water molecules. In addition, as the temperature increases, the measured value of N2 adsorption/desorption also increases accordingly. This work lays a foundation for further development and application of oxide materials in sensing, storage and purification fields. Experimental Section Materials: Rhenium powder (99%) was purchased from Alfa Aesar Co., Ltd., USA; Ethanol was purchased from Sinopharm Chemical Reagent Co., Ltd., China; Nitrogen gas was purchased from Shanghai Gas Co., Ltd., China; Deionized water was used for sample preparation throughout this experiment.. Preparation: Rhenium powder (1g) was added into ethanol solution containing 0.5g NaOH under stirring at room temperature for 1 hour to form an homogeneous suspension solution which is then transferred into an electrochemical cell filled with deionized water as electrolyte solution.. An AC voltage source applied between two electrodes generates an electric field across them that causes electrolysis reaction between rhenium ions in suspension solution and oxygen ions in electrolyte solution leading to formation of reoxidized microspheres.. After 10 hours’ electrolysis process at room temperature under 1A current density ,the product was collected by filtration followed by washing several times with deionized water until pH value reaches neutrality before being dried at 80°C overnight.. Characterization: X-ray diffraction (XRD), scanning electron microscopy (SEM), nitrogen adsorption/desorption isotherms were used for characterization.. The XRD pattern was recorded on a PANalytical X’Pert PRO MPD instrument using CuKα radiation source operating at 40 kV voltage and 30 mA current .The SEM images were obtained on a Hitachi S-4500 instrument operated at 5 kV accelerating voltage .The nitrogen adsorption/desorption isotherms were recorded on a Micromeritics ASAP 2020 instrument using nitrogen gas as adsorbate . Results And Discussion: Figure 1 shows XRD pattern obtained from prepared sample indicating formation of single phase rhenium oxide microspheres without any other impurity peaks present .. Figure 2 shows SEM image showing spherical morphology .. Figure 3 shows nitrogen adsorbtion/ desorbtion isotherm which indicates type IV hysteresis loop confirming mesoporous nature .. As shown in figure 4 ,the measured value of N2adsoprtion / desoprtion increased when exposed to different relative humidity levels indicating good sensitivity towards moisture content .. Moreover ,as shown in figure 5 ,the measured values also increased with increasing temperatures confirming thermosensitive behaviour .. Conclusion :In conclusion ,we have successfully prepared rhenium oxide microsphere through electrochemical method without any other additives present . These samples exhibited good sensitivity towards moisture content as well as thermosensitive behaviour making them suitable candidates for applications such as sensors or actuators .