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Touch stimulated pulse generation in biomimetic single-layer graphene

Title
Touch stimulated pulse generation in biomimetic single-layer graphene
Author
이승백
Keywords
ELECTRONIC TRANSPORT; PRESSURE SENSOR; TACTILE; TRANSISTORS; SKIN; MANIPULATION; COMPOSITE; SIGNALS; MATRIX
Issue Date
2016-01
Publisher
ROYAL SOC CHEMISTRY
Citation
NANOSCALE, v. 8, NO 6, Page. 3425-3431
Abstract
Detecting variation in contact pressure is a separate sensing mode in the human somatosensory system that differs from the detection of pressure magnitude. If pressure magnitude and variation sensing can be achieved simultaneously, an advanced biomimetic tactile system that better emulates human senses may be developed. We report on a novel single-layer graphene based artificial mechanoreceptor that generates a resistance pulse as the contact stimulus passes a specific threshold pressure, mimicking the generation of action potentials in a biological fast-adapting mechanoreceptor. The electric field from a flexible membrane gate electrode placed above a graphene channel raises the Fermi level from the valence band as pressure deflects the membrane. The threshold pressure is reached when the Fermi level crosses the Dirac point in the graphene energy band, which generates a sharp peak in the measured resistance. We found that by changing the gate potential it was possible to modulate the threshold pressure and using a series of graphene channels, a train of pulses were generated during a transient pressurizing stimulus demonstrating biomimetic behaviour.
URI
http://pubs.rsc.org/en/Content/ArticleLanding/2016/NR/C5NR07115A#!divAbstracthttp://hdl.handle.net/20.500.11754/30606
ISSN
2040-3364; 2040-3372
DOI
10.1039/c5nr07115a
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > ELECTRONIC ENGINEERING(융합전자공학부) > Articles
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