Fabrication and Performance of Graphene Flexible Pressure Sensor with Micro/Nano Structure

Laser-induced graphene (LIG) has been widely used in flexible sensors due to its excellent mechanical properties and high conductivity. In this paper, a flexible pressure sensor prepared by bionic micro/nanostructure design and LIG mass fraction regulation is reported. First, prepared LIG and conduc...

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Bibliographic Details
Published in:Sensors (Basel, Switzerland) Switzerland), 2021-10, Vol.21 (21), p.7022
Main Authors: Wu, Weibin, Han, Chongyang, Liang, Rongxuan, Xu, Jian, Li, Bin, Hou, Junwei, Tang, Ting, Zeng, Zhiheng, Li, Jie
Format: Article
Language:English
Subjects:
Aluminum alloys
Bionics
Carbon
Composite materials
Conducting polymers
Flexible components
flexible pressure sensor
Graphene
Laser processing
laser-induced graphene
Lasers
Manufacturing
Mechanical properties
Metal plates
micro-nano structure
Microstructure
Morphology
Neodymium lasers
Polymers
Pressure sensors
Recovery time
Response time
Scanning electron microscopy
Semiconductor lasers
Sensitivity
Sensors
Transfer printing
Wearable technology
YAG lasers
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Summary:Laser-induced graphene (LIG) has been widely used in flexible sensors due to its excellent mechanical properties and high conductivity. In this paper, a flexible pressure sensor prepared by bionic micro/nanostructure design and LIG mass fraction regulation is reported. First, prepared LIG and conductive carbon paste (CCP) solutions were mixed to obtain a conductive polymer. After the taro leaf structure was etched on the surface of the aluminum alloy plate by Nd:YAG laser processing, the conductive polymer was evenly coated on the template. Pressure sensors were packaged with a stencil transfer printing combined with an Ecoflex flexible substrate. Finally, the effects of different laser flux and the proportion of LIG in the composite on the sensitivity of the sensor are discussed. The results show that when the laser flux is 71.66 J·cm−2 and the mass fraction of LIG is 5%, the sensor has the best response characteristics, with a response time and a recovery time of 86 ms and 101 ms, respectively, with a sensitivity of 1.2 kPa−1 over a pressure range of 0–6 kPa, and stability of 650 cycle tests. The LIG/CCP sensor with a bionic structure demonstrates its potential in wearable devices.
ISSN:1424-8220
1424-8220
DOI:10.3390/s21217022