低钯含量CeO2/ZnO的超声法制备及其构建亚秒级丙酮传感器的研究
Low palladium content CeO2/ZnO composite for acetone sensor with sub-second response prepared by ultrasonic method
陈徐倢 1幸巧玲 1唐轩 2蔡勇 3张明4
作者信息
- 1. Hunan Provincial Key Laboratory of Low-dimensional Structural Physics&Devices,School of Physics and Electronics,Hunan University,Changsha 410082,China
- 2. School of Mechanical Engineering and Mechanics,Xiangtan University,Xiangtan 411105,China
- 3. Changsha Semiconductor Technology and Application Innovation Research Institute,College of Semiconductors(College of Integrated Circuits),Hunan University,Changsha 410082,China;Engineering Research Center of Advanced Semiconductor Technology and Application of Ministry of Education&Key Laboratory for Micro-/Nano-Optoelectronic Devices of Ministry of Education,National Key Laboratory of Power Semiconductor and Integration Technology,College of Semiconductors(College of Integrated Circuits),Hunan University,C
- 4. Changsha Semiconductor Technology and Application Innovation Research Institute,College of Semiconductors(College of Integrated Circuits),Hunan University,Changsha 410082,China;Research Institute of Hunan University in Chongqing,Chongqing 401120,China;Engineering Research Center of Advanced Semiconductor Technology and Application of Ministry of Education&Key Laboratory for Micro-/Nano-Optoelectronic Devices of Ministry of Education,National Key Laboratory of Power Semiconductor and Integration Technology,C
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摘要
在实际应用中,常使用贵金属掺杂制备高性能气体传感器,但是掺杂较高含量贵金属会导致制备成本提高.为此,本研究采用超声辅助和静电纺丝合成了低钯含量的CeO2/ZnO-Pd丙酮传感器,该传感器具有快速响应和对丙酮的高选择性.在相同的钯添加量的情况下,使用超声法掺杂比搅拌法制备的传感器选择性系数提升了1.88倍.与纯PdO掺杂的CeO2/ZnO-PdO材料相比,CeO2/ZnO-Pd中Pd的含量约为CeO2/ZnO-PdO的30%,但对丙酮的选择性系数提高了2.56倍.实验结果表明,在300℃条件下CeO2/ZnO-Pd传感器对50×10-6丙酮有较高的响应(22.54),选择性系数是CeO2/ZnO传感器的2.57倍.同时,该传感器具有亚秒级的响应时间(0.6 s),且对330×10-9的丙酮仍然有2.36的响应.传感器性能提高可以归因于超声法掺杂使得Pd颗粒更小从而增加了Pd与气体接触面积,CeO2/ZnO-Pd中npn异质结的构成,以及Pd/PdO的协同作用.这表明超声掺杂Pd为提高掺杂金属的利用率和制备高选择性气体传感器提供了思路.
Abstract
In practical applications,noble metal doping is often used to prepare high performance gas sensors,but more noble metal doping will lead to higher preparation costs.In this study,CeO2/ZnO-Pd with low palladium content was prepared by ultrasonic method with fast response and high selectivity for acetone sensing.With the same amount of palladium added,the selectivity coefficient of CeO2/ZnO-Pd is 1.88 times higher than that of the stirred sensor.Compared with the pure PdO-doped CeO2/ZnO-PdO material,the content of Pd in CeO2/ZnO-PdO is about 30%of that in CeO2/ZnO-PdO,but the selectivity coefficient for acetone is 2.56 times higher.The CeO2/ZnO-Pd sensor has a higher response(22.54)to 50×10-6 acetone at 300℃and the selectivity coefficient is 2.57 times that of the CeO2/ZnO sensor.The sensor has a sub-second response time(0.6 s)and still has a 2.36 response to 330×10-9 of acetone.Ultrasonic doping makes Pd particles smaller and increases the contact area with gas.Meanwhile,the composition of n-p-n heterojunction and the synergistic effect of Pd/PdO improve the sensor performance.It shows that ultrasonic Pd doping provides a way to improve the utilization rate of doped metals and prepare highly selective gas sensors.
关键词
低钯含量/亚秒级/超声法/丙酮传感器/异质结Key words
low palladium/sub-second responce/ultrasonic method/acetone sensor/heterojunction引用本文复制引用
基金项目
Natural Science Foundation of Hunan Province,China(2023JJ10005)
National Natural Science Foundation of China(51772082)
National Natural Science Foundation of China(51804106)
出版年
2024
NETL
NSTL
万方数据