*********************************
There is now a CONTENT FREEZE for Mercury while we switch to a new platform. It began on Friday, March 10 at 6pm and will end on Wednesday, March 15 at noon. No new content can be created during this time, but all material in the system as of the beginning of the freeze will be migrated to the new platform, including users and groups. Functionally the new site is identical to the old one. webteam@gatech.edu
*********************************
Qingshen Jing – MSE JPP PKU PhD
Time: June 6th 2015, 8:00 am(Beijing Time)
Location: Room 806, Pacific Development Center, Peking University (52th Haidian Road, Haidian district, Beijing)
The presentation will be broadcasted live to Georgia Tech
Coordinate Time in GT: June 5th 2015, 8:00 pm (Atlanta, EST)
Location: IPST, RM 114.
Committee (with advisor & program affiliation)
Dr. Zhong Lin Wang (GT), co-advisor
Dr. Pingchou Han (PKU), co-advisor
Dr. Meilin Liu (GT)
Dr. Ching-Ping Wong (GT)
Dr. Shulin Bai (PKU)
Dr. Anyuan Cao (PKU)
Dr. Ruqiang Zou (PKU)
Title
PATTERNED THIN-FILM TRIBOELECTRIC GENERATOR FOR HARVESTING MICRO-MESO SCALE AMBIENT ENERGY AND KINEMATIC SENSING
ABSTRACT
Harnessing random micro-meso scale ambient energy (M2SAE), which is widely available in human motions, wind driven vibrations, water surface fluctuations, etc., is not only clean and sustainable, but it also enables self-powered sensors and devices to be realized. In my research, I have fabricated a case-encapsulated triboelectric generator (cTENG) based on the principles of sliding electrification for harvesting M2SAE from reciprocating motions. The cTENG generated an average effective output power of 12.2 mW and a power density of 1.36 W/m2, triggered by direct-applied forces, as well as, inertia force. Based on the success of the patterned cTENG, I have built a self-powered velocity sensor for either rectified linear or rotary motion by sourcing the energy from the triboelectric generator. The triboelectric generated output signals when integrated with a digital circuit and a microcontroller unit can be directly processed into remarkably stable, macro-scale output signals for measurements of (0.1-0.6) ms-1 ± 0.5% for linear velocities and (300-700) rpm ± 0.9% for rotary velocities. I have also fabricated a self-powered, thin-film motion direction sensor by harvesting the operational energy from a close-proximity triboelectrification of two surfaces in relative reciprocation. The mover made by coating a thin polytetrafluoroethylene film with a 2-column, specially arranged array of copper electrodes and the stator is made by coating the top and bottom surfaces of a thin polyimide film with a 2-column aligned array of copper electrodes placed in an alternating pattern. As the mover traverses over the stator, the electrodes in the mover actively generate electric signals of ±5 V to attain a peak power density of ≥ 65 mW/m2 at speeds of 0.3 ms-1. Finally, I have demonstrated a quasi-static angular positioning sensor based on 4-channel encoded pattern on the electrification surface. Under a rotation speed of 100 rad min-1, the output voltage of the sensor reaches as high as 60 V. Angular resolution of 22.5° is achieved and can be further improved by increasing the number of channels. Triggered by the output voltage signal, the rotating characteristics of the steering wheel can be real-time monitored and mapped by being mounted to the sensor. I believe my pioneering demonstration of the applied triboelectric technology will have a huge impact in the industrial commercialization of self-powered devices and sensors.
