A Flexible Low-Pass Filter Based on Laser-Induced Graphene
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https://doi.org/10.1007/s11664-020-08462-7 Ó 2020 The Minerals, Metals & Materials Society
A Flexible Low-Pass Filter Based on Laser-Induced Graphene XIANGFU WANG,1,2,3,5 YIXUAN CUI,1 YONG TAO,4 HENGXIN YANG,1,6 and JIANG ZHAO1,7 1.—College of Electronic and Optical Engineering & College of Microelectronics, Nanjing University of Posts and Telecommunications, Nanjing 210023, China. 2.—National Electronic Science and Technology Experimental Teaching Demonstrating Center, Nanjing University of Posts and Telecommunications, Nanjing, China. 3.—National Information and Electronic Technology Virtual Simulation Experiment Teaching Center, Nanjing University of Posts and Telecommunications, Nanjing, China. 4.—Nanjing RZisources International Trading Co., Ltd., Nanjing 210019, Jiangsu, China. 5.—e-mail: [email protected]. 6.—e-mail: [email protected]. 7.—e-mail: [email protected]
A graphene-based flexible filter was obtained via one-step laser heating of a polyimide film. The key parameters of a laser have been confirmed by comparing simulated results and experimental data. High-frequency components of input signals were filtered out effectively for different waveforms, such as sine, rectangular, triangle and pulse waveforms. In order to study filtering performance, this paper focused on amplitude frequency curve, phase frequency curve, transient response and mechanical stability. The phase frequency curve is linear distribution, indicating that it is convenient to control phase shift. The mechanical stability of the device remains good even after 5000 bends, which is unreported in previous work. This paper demonstrated that a graphene-based flexible filter prepared by one-step laser heating has excellent performance and opens new way of thinking about flexible electronics in the future. Key words: Laser induced graphene, flexibility, low-pass filters, mechanical stability
INTRODUCTION Flexible devices can adapt to different work environments and meet the deformation requirements, so this opens up a broad application in electronic skin,1–3 flexible organic light-emitting diode displays,4,5 flexible medical electronics,6–8 flexible monitoring,9,10 and flexible sensors.11–13 The appearance and development of graphene promoted flexible electronics and became a research hotspot.14–18 In the view of materials science, graphene exhibits special physical and chemical properties. The electron mobility at room temperature exceeds 15,000 cm2/V s, and the resistivity is 106 X cm.19 Graphene has been successfully prepared by several routes including chemical vapor
(Received February 10, 2020; accepted August 29, 2020)
deposition (CVD) methods, micromechanical stripping, reduced graphene oxide and so on. The above methods often need high temperature and pressure conditions or strong acids and oxidants. Laser heating polyimide (PI) film into 3D porous graphene, a material termed laser-induced graphene (LIG), provided a one-step, scalable preparation.20,21 This method makes LIG an ideal candidate to fabricate graphene-based fle
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