化學專業(yè)外文資料翻譯--具有高靈敏度的甲醛氣體傳感器的制備及其氣敏特性-資料下載頁
2025-05-12 15:25本頁面
【導(dǎo)讀】相對甲醛混有氧化鉻的氧化銦氣體傳感器特性已經(jīng)研究過了。間接加熱式氣體傳感。器是用敏感材料進行制備的。最終的材料的狀態(tài)和傳感層的形態(tài)通過x射線衍射和掃描。電子顯微鏡分別在焙燒前后觀察到其特點。操作溫度對傳感器響應(yīng)的影響氧化鉻和氧化。甲醛具有良好的反應(yīng)性能，使他們成為甲醛氣體檢測最有希望的候選材料。作為一個重要的工業(yè)化學品，甲醛被應(yīng)用于制造業(yè)，建筑板，膠合板和漆這樣的材料。由于其殺菌性能也可用于。藥理學和藥物中。然而，調(diào)查結(jié)果表明，因為它是揮發(fā)性有害化合物，所以甲醛會對人。體造成許多損害。制造氣體傳感器被認為是一個理想的監(jiān)測氣體的手段。我們目前的調(diào)查主要涉及與甲醛。作為一個單組分氧化物，由于其良好的靈敏度，氧化銦。因此，當其他金屬氧化物摻雜氧化銦，對。在本次調(diào)查中，用固態(tài)合成技術(shù)制備氧化鎘和氧化銦的混合物，通過。基于化鎘和氧化銦的混合物的間接加熱的氣。氣敏機理是基于氧化鉻和氧化銦材料的電導(dǎo)的變化。
【正文】 ll response to alcohol and gasoline, but large response to formaldehyde gas. The response to 10 ppm formaldehyde gas is more than 80. The response is considerably larger than those recently reported for SnO2–Sb2O4,WO3–Sb2O4, NiO, and formaldehyde gas sensors [17–21]. This gas sensor showed large response to formaldehyde gas and high selectivity against alcohol and gasoline. This result indicates that the CdO–In2O3 specimen is a good gassensing material for detecting formaldehyde, which can be applied for monitoring and controlling of the formaldehyde gas. A good response and quick response/recovery time were observed with this sensor at the optimal operating temperature of 95 .C. The response changes of the gas sensor to different formaldehyde gas concentrations (10–100 ppm) are shown in Fig. 5. As a highly sensitive sensor, it can measure very low concentrations, even 10 ppm. The output voltage increases in a linear relation to the formaldehyde gas concentration with a short response time. Response time and recovery time (defined as the time required to reach 90% of the final equilibrium value) was 2 min and the recovery time was 4 min. The gassensing mechanism is based on the changes in conductance of the CdO–In2O3 material. The oxygen adsorbed on the surface of the material influences the conductance of the CdO–In2O3 sensor. The oxygen adsorption depends on the particle size, large specific area of the material, and the operating temperature of the sensor [22]. With the increasing temperature in air, the state of oxygen adsorbed on the surface of the CdO–In2O3 material undergoes the following Fig. 3. The effects of operating temperature on the sensor response to 100 ppm formaldehyde. increasing concentrations operated at an operating temperature of The oxygen species capture electrons from the material, leading to an increase in hole concentration and a decrease in electron concentration. When the sensor is exposed to formaldehyde gas, the electrons trapped by the adsorptive states will be released, leading to a decrease in sensor resistance. So, the CdO–In2O3 sensor is — 45 — sensitive to reducing formaldehyde gas. The sensors have good stabilities (no shown data). The stability mechanism is more plicated and further work is to be done to get a definite understanding. 4. Conclusion Preparation of the CdO–In2O3 specimen used as a sensing material to formaldehyde has been shown to be feasible by the solidstate synthesis technologies. The fabricated sensor showed large response magnitude, high selectivity, quick responses, and good recovery to formaldehyde gas at a low operating temperature (95 .C). The experimental results indicate the potential of using CdOmixed In2O3 material for formaldehyde gas sensing. Acknowledgements This work was supported by National Natural Science Foundation of China (No. 50662020), and Natural Science Foundation of Yunnan Province, China (No. 2020E0013M).
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