Optimization of Piezoresistive Strain Sensors Based on Gold Nanoparticle Deposits on PDMS Substrates for Highly Sensitive Human Pulse Sensing

In this study, highly-sensitive piezoresistive strain sensors based on gold nanoparticle thin films deposited on a stretchable PDMS substrate by centrifugation were developed to measure arterial pulse waveform. By controlling carbon chain length of surfactants, pH value and particle density of the c...

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Bibliographic Details
Published in:Nanomaterials (Basel, Switzerland) Switzerland), 2022-07, Vol.12 (13), p.2312
Main Authors: Su, Yu-Shun, Yang, Wei-Rong, Jheng, Wei-Wun, Kuo, Watson, Tzeng, Shien-Der, Yasuda, Kiyokazu, Song, Jenn-Ming
Format: Article
Language:English
Subjects:
arterial pulses
Centrifugation
Elbow
gauge factor
Gold
Graphene
Molecular chains
Nanomaterials
nanoparticle
Nanoparticles
Nanowires
Optimization
Particle density (concentration)
PDMS
pH effects
piezo-resistance
Polyethylene terephthalate
Sensors
Strain gauges
Substrates
Surfactants
Thin films
Waveforms
Wrist
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Summary:In this study, highly-sensitive piezoresistive strain sensors based on gold nanoparticle thin films deposited on a stretchable PDMS substrate by centrifugation were developed to measure arterial pulse waveform. By controlling carbon chain length of surfactants, pH value and particle density of the colloidal solutions, the gauge factors of nanoparticle thin film sensors can be optimized up to 677 in tensile mode and 338 in compressive mode, and the pressure sensitivity up to 350. Low pH and thin nanoparticle films produce positive influences to superior gauge factors. It has been demonstrated that nanoparticle thin film sensors on PDMS substrates were successfully applied to sense arterial pulses in different body positions, including wrist, elbow crease, neck, and chest.
ISSN:2079-4991
2079-4991
DOI:10.3390/nano12132312