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High-performance transparent pressure sensors based on sea-urchin shaped metal nanoparticles and polyurethane microdome arrays for real-time monitoring

Title
High-performance transparent pressure sensors based on sea-urchin shaped metal nanoparticles and polyurethane microdome arrays for real-time monitoring
Authors
Lee, DonghwaKim, JongyounKim, HonggiHeo, HyojungPark, KyutaeLee, Youngu
DGIST Authors
Lee, Youngu
Issue Date
2018-10
Citation
Nanoscale, 10(39), 18812-18820
Type
Article
Article Type
Article
Keywords
MammalsNanoimprint lithographyPolyurethanesPressure sensorsShellfishHigh performance characteristicsNano-imprinting processPiezoresistive pressure sensorsPolyurethane compositesQuantum tunneling effectsReal time monitoringSensing applicationsSmall concentrationMetal nanoparticles
ISSN
2040-3364
Abstract
An ultra-sensitive and transparent piezoresistive pressure sensor based on a sea-urchin shaped metal nanoparticle (SSNP)-polyurethane (PU) composite with microdome arrays is successfully fabricated for the first time. The piezoresistive pressure sensor with microdome arrays was prepared using a nanoimprinting process based on an intermediate polymer substrate (IPS) replica mold. It showed a superior sensitivity (71.37 kPa-1) and a high optical transmittance (77.7% at 550 nm) due to the effective quantum tunneling effect even at small concentrations of conductive SSNP filler (6 mg mL-1). The high-performance characteristics of the piezoresistive pressure sensor are attributed to the geometric effects of the microdome structure, especially the stress concentration at small contact spots and the deformation of the contact area. The piezoresistive pressure sensor with microdome arrays also exhibited a fast response/relaxation time (30 ms), ultra-low pressure detection (4 Pa), and excellent long-term stability under harsh conditions. In addition, the effectiveness of the piezoresistive pressure sensors in various sensing applications including sensing mapping, human arterial pulse monitoring, and the detection of muscle movement is also successfully demonstrated. It is anticipated that this novel transparent pressure sensor based on a SSNP-PU composite with microdome arrays will be a key component in the development of integrated transparent sensing applications. © 2018 The Royal Society of Chemistry.
URI
http://hdl.handle.net/20.500.11750/9376
DOI
10.1039/c8nr05843a
Publisher
Royal Society of Chemistry
Related Researcher
  • Author Lee, Youngu Organic & Printed Electronics Laboratory(OPEL)
  • Research Interests OTF Solar cell; OLED; Printed Electronics; 유기박막형 태양전지; OLED; Printed Electronics
Files:
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Collection:
Department of Energy Science and EngineeringOrganic & Printed Electronics Laboratory(OPEL)1. Journal Articles


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