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A Flexible 360-Degree Thermal Sound Source Based on Laser Induced Graphene

1,2, 1,2, 1,2, 3, 1,2, 1,2,* and 1,2,*
Institute of Microelectronics, Tsinghua University, Beijing 10084, China
Tsinghua National Laboratory for Information Science and Technology (TNList), Tsinghua University, Beijing 100084, China
Ming Hsieh Department of Electrical Engineering, University of Southern California, Los Angeles, CA 90089, USA
Authors to whom correspondence should be addressed.
Academic Editors: Ming-Tsang Lee, Te-Hua Fang and Chien-Hung Liu
Nanomaterials 2016, 6(6), 112;
Received: 26 April 2016 / Revised: 16 May 2016 / Accepted: 30 May 2016 / Published: 7 June 2016
PDF [2603 KB, uploaded 7 June 2016]


A flexible sound source is essential in a whole flexible system. It’s hard to integrate a conventional sound source based on a piezoelectric part into a whole flexible system. Moreover, the sound pressure from the back side of a sound source is usually weaker than that from the front side. With the help of direct laser writing (DLW) technology, the fabrication of a flexible 360-degree thermal sound source becomes possible. A 650-nm low-power laser was used to reduce the graphene oxide (GO). The stripped laser induced graphene thermal sound source was then attached to the surface of a cylindrical bottle so that it could emit sound in a 360-degree direction. The sound pressure level and directivity of the sound source were tested, and the results were in good agreement with the theoretical results. Because of its 360-degree sound field, high flexibility, high efficiency, low cost, and good reliability, the 360-degree thermal acoustic sound source will be widely applied in consumer electronics, multi-media systems, and ultrasonic detection and imaging. View Full-Text
Keywords: 360-degree sound source; graphene oxide; laser induced graphene; direct laser writing 360-degree sound source; graphene oxide; laser induced graphene; direct laser writing

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Tao, L.-Q.; Liu, Y.; Ju, Z.-Y.; Tian, H.; Xie, Q.-Y.; Yang, Y.; Ren, T.-L. A Flexible 360-Degree Thermal Sound Source Based on Laser Induced Graphene. Nanomaterials 2016, 6, 112.

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