Wireless wide-range pressure sensor based on graphene/PDMS sponge for tactile monitoring

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Abstract

We propose a flexible wireless pressure sensor, which uses a graphene/polydimethylsiloxane (GR/PDMS) sponge as the dielectric layer. The sponge is sandwiched between two surfaces of a folded flexible printed circuit with patterned Cu as the antenna and electrode. By adjusting graphene and NH ₄HCO ₃ concentrations, a composite with 20% concentration of NH ₄HCO ₃ and 2% concentration of graphene as the dielectric layer is obtained, which exhibits high sensitivity (2.2 MHz/kPa), wide operating range (0–500 kPa), rapid response time (~7 ms), low detection limit (5 Pa), and good stability, recoverability, and repeatability. In addition, the sensor is sensitive to finger bending and facial muscle movements for smile and frown, that are transmitted using wireless electromagnetic coupling; therefore, it has potential for a wide range of applications such as intelligent robots, bionic-electronic skin and wearable electronic devices.

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Most cited references 39

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Highly sensitive flexible pressure sensors with microstructured rubber dielectric layers.

Stefan Mannsfeld, Benjamin Tee, Randall M Stoltenberg … (2010)

The development of an electronic skin is critical to the realization of artificial intelligence that comes into direct contact with humans, and to biomedical applications such as prosthetic skin. To mimic the tactile sensing properties of natural skin, large arrays of pixel pressure sensors on a flexible and stretchable substrate are required. We demonstrate flexible, capacitive pressure sensors with unprecedented sensitivity and very short response times that can be inexpensively fabricated over large areas by microstructuring of thin films of the biocompatible elastomer polydimethylsiloxane. The pressure sensitivity of the microstructured films far surpassed that exhibited by unstructured elastomeric films of similar thickness, and is tunable by using different microstructures. The microstructured films were integrated into organic field-effect transistors as the dielectric layer, forming a new type of active sensor device with similarly excellent sensitivity and response times.

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Multifunctional wearable devices for diagnosis and therapy of movement disorders.

Donghee Son, Jongha Lee, Shutao Qiao … (2014)

Wearable systems that monitor muscle activity, store data and deliver feedback therapy are the next frontier in personalized medicine and healthcare. However, technical challenges, such as the fabrication of high-performance, energy-efficient sensors and memory modules that are in intimate mechanical contact with soft tissues, in conjunction with controlled delivery of therapeutic agents, limit the wide-scale adoption of such systems. Here, we describe materials, mechanics and designs for multifunctional, wearable-on-the-skin systems that address these challenges via monolithic integration of nanomembranes fabricated with a top-down approach, nanoparticles assembled by bottom-up methods, and stretchable electronics on a tissue-like polymeric substrate. Representative examples of such systems include physiological sensors, non-volatile memory and drug-release actuators. Quantitative analyses of the electronics, mechanics, heat-transfer and drug-diffusion characteristics validate the operation of individual components, thereby enabling system-level multifunctionalities.

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Silk-molded flexible, ultrasensitive, and highly stable electronic skin for monitoring human physiological signals.

Xuewen Wang, Yang Gu, Zuoping Xiong … (2014)

Flexible and transparent E-skin devices are achieved by combining silk-molded micro-patterned polydimethylsiloxane (PDMS) with single-walled carbon nanotube (SWNT) ultrathin films. The E-skin sensing device demonstrates superior sensitivity, a very low detectable pressure limit, a fast response time, and a high stability for the detection of superslight pressures, which may broaden their potential use as cost-effective wearable electronics for healthcare applications. © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

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Author and article information

Contributors

Qiulin Tan: tanqiulin@nuc.edu.cn

Journal

Journal ID (nlm-ta): Sci Rep

Journal ID (iso-abbrev): Sci Rep

Title: Scientific Reports

Publisher: Nature Publishing Group UK (London )

ISSN (Electronic): 2045-2322

Publication date (Electronic): 8 March 2019

Publication date PMC-release: 8 March 2019

Publication date Collection: 2019

Volume: 9

Electronic Location Identifier: 3916

Affiliations

GRID grid.440581.c, Science and Technology on Electronic Test and Measurement Laboratory, , North University of China, ; Tai Yuan, 030051 China

Article

Publisher ID: 40828

DOI: 10.1038/s41598-019-40828-8

PMC ID: 6408520

PubMed ID: 30850692

SO-VID: 98da542f-ae32-4d11-a087-7657c8d15c68

License:

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

History

Date received : 22 August 2018

Date accepted : 20 February 2019

Funding

Funded by: FundRef https://doi.org/10.13039/501100001809, National Natural Science Foundation of China (National Science Foundation of China);

Award ID: 61471324

Award ID: 51425505

Award ID: 61471324

Award ID: 51425505

Award ID: 61471324

Award Recipient : Hairong Kou Lei Zhang Qiulin Tan Guanyu Liu Helei Dong Jijun Xiong

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Wireless wide-range pressure sensor based on graphene/PDMS sponge for tactile monitoring

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Most cited references 39

Highly sensitive flexible pressure sensors with microstructured rubber dielectric layers.

Multifunctional wearable devices for diagnosis and therapy of movement disorders.

Silk-molded flexible, ultrasensitive, and highly stable electronic skin for monitoring human physiological signals.

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