个人简介
Prof. Li Fan
Prof. Li Fan
Nanjing University, China
标题: Ultrasonic hydrogen sensors based on graphene sensitive layers
摘要: 
Ultrasonic sensors are one type of acoustic devices which can be used to detect trace level substances based on perturbation of acoustic transmission induced by absorbed substances on the surfaces of sensitive layers. Due to the advantages of high sensitivities, small bulks, high integration, wide application fields, and etc., ultrasonic sensors have been give high consideration in the fields of sensors and acoustics. Here, we report an ultrasonic sensor using graphene as the sensitive layer, which is designed to detect trace level hydrogen. The sensor is created on the basis of LiNbO3 piezoelectric material. Hummers method is adopted to grow a graphene sensitive layer on the surface of a LiNbO3 substrate and platinum is used as a catalyst. Experimental results show that the sensor can response to hydrogen with a volume concentration of merely 5ppm, which exhibit an extremely high sensitivity. Additionally, we measure the sensitivity under different working conditions and find that the background gas and humidity exert influences on the performance of the hydrogen sensor.
简介: 
Li Fan is an associate professor of Nanjing University, Nanjing, China. He received his Ph. D. Degree from Institute of Acoustics, Nanjing University. His research interest is in ultrasonic sensors and thermoacoustic refrigerators. He is the author and co-author of over seventy papers published with Phys. Rev. B, Appl. Phys. Lett., Sens. Actuators B, J. Appl. Phys., J. Acoust. Soc. Am., and etc. He is a director of Acoustical Society of China and Acoustical Society of Jiangsu Province. He is a council member of the Physical Acoustics Branch of Acoustical Society of China.