Abstract
The fundamental challenge in designing transparent pressure sensors is the ideal combination of high optical transparency and high pressure sensitivity. Satisfying these competing demands is commonly achieved by a compromise between the transparency and usage of a patterned dielectric surface, which increases pressure sensitivity, but decreases transparency. Herein, a design strategy for fabricating high-transparency and high-sensitivity capacitive pressure sensors is proposed, which relies on the multiple states of nanoparticle dispersity resulting in enhanced surface roughness and light transmittance. We utilize two nanoparticle dispersion states on a surface: (i) homogeneous dispersion, where each nanoparticle (≈500 nm) with a size comparable to the visible light wavelength has low light scattering; and (ii) heterogeneous dispersion, where aggregated nanoparticles form a micrometer-sized feature, increasing pressure sensitivity. This approach is experimentally verified using a nanoparticle-dispersed polymer composite, which has high pressure sensitivity (1.0 kPa–1), and demonstrates excellent transparency (>95%). We demonstrate that the integration of nanoparticle-dispersed capacitor elements into an array readily yields a real-time pressure monitoring application and a fully functional touch device capable of acting as a pressure sensor-based input device, thereby opening up new avenues to establish processing techniques that are effective on the nanoscale yet applicable to macroscopic processing.
| Original language | English |
|---|---|
| Article number | 1703432 |
| Journal | Small |
| Volume | 14 |
| Issue number | 8 |
| DOIs | |
| Publication status | Published - 2018 Feb 22 |
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Keywords
- conformal sensors
- flexible sensors
- health monitoring
- large-scale touch interfaces
- nanoparticle-roughened dielectrics
ASJC Scopus subject areas
- Biotechnology
- Biomaterials
- Engineering (miscellaneous)
Cite this
Transparent, Flexible, Conformal Capacitive Pressure Sensors with Nanoparticles. / Kim, Hyeohn; Kim, Gwangmook; Kim, Taehoon; Lee, Sangwoo; Kang, Donyoung; Hwang, Min Soo; Chae, Youngcheol; Kang, Shinill; Lee, Hyungsuk; Park, Hong Kyu; Shim, Wooyoung.
In: Small, Vol. 14, No. 8, 1703432, 22.02.2018.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Transparent, Flexible, Conformal Capacitive Pressure Sensors with Nanoparticles
AU - Kim, Hyeohn
AU - Kim, Gwangmook
AU - Kim, Taehoon
AU - Lee, Sangwoo
AU - Kang, Donyoung
AU - Hwang, Min Soo
AU - Chae, Youngcheol
AU - Kang, Shinill
AU - Lee, Hyungsuk
AU - Park, Hong Kyu
AU - Shim, Wooyoung
PY - 2018/2/22
Y1 - 2018/2/22
N2 - The fundamental challenge in designing transparent pressure sensors is the ideal combination of high optical transparency and high pressure sensitivity. Satisfying these competing demands is commonly achieved by a compromise between the transparency and usage of a patterned dielectric surface, which increases pressure sensitivity, but decreases transparency. Herein, a design strategy for fabricating high-transparency and high-sensitivity capacitive pressure sensors is proposed, which relies on the multiple states of nanoparticle dispersity resulting in enhanced surface roughness and light transmittance. We utilize two nanoparticle dispersion states on a surface: (i) homogeneous dispersion, where each nanoparticle (≈500 nm) with a size comparable to the visible light wavelength has low light scattering; and (ii) heterogeneous dispersion, where aggregated nanoparticles form a micrometer-sized feature, increasing pressure sensitivity. This approach is experimentally verified using a nanoparticle-dispersed polymer composite, which has high pressure sensitivity (1.0 kPa–1), and demonstrates excellent transparency (>95%). We demonstrate that the integration of nanoparticle-dispersed capacitor elements into an array readily yields a real-time pressure monitoring application and a fully functional touch device capable of acting as a pressure sensor-based input device, thereby opening up new avenues to establish processing techniques that are effective on the nanoscale yet applicable to macroscopic processing.
AB - The fundamental challenge in designing transparent pressure sensors is the ideal combination of high optical transparency and high pressure sensitivity. Satisfying these competing demands is commonly achieved by a compromise between the transparency and usage of a patterned dielectric surface, which increases pressure sensitivity, but decreases transparency. Herein, a design strategy for fabricating high-transparency and high-sensitivity capacitive pressure sensors is proposed, which relies on the multiple states of nanoparticle dispersity resulting in enhanced surface roughness and light transmittance. We utilize two nanoparticle dispersion states on a surface: (i) homogeneous dispersion, where each nanoparticle (≈500 nm) with a size comparable to the visible light wavelength has low light scattering; and (ii) heterogeneous dispersion, where aggregated nanoparticles form a micrometer-sized feature, increasing pressure sensitivity. This approach is experimentally verified using a nanoparticle-dispersed polymer composite, which has high pressure sensitivity (1.0 kPa–1), and demonstrates excellent transparency (>95%). We demonstrate that the integration of nanoparticle-dispersed capacitor elements into an array readily yields a real-time pressure monitoring application and a fully functional touch device capable of acting as a pressure sensor-based input device, thereby opening up new avenues to establish processing techniques that are effective on the nanoscale yet applicable to macroscopic processing.
KW - conformal sensors
KW - flexible sensors
KW - health monitoring
KW - large-scale touch interfaces
KW - nanoparticle-roughened dielectrics
UR - http://www.scopus.com/inward/record.url?scp=85041077598&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85041077598&partnerID=8YFLogxK
U2 - 10.1002/smll.201703432
DO - 10.1002/smll.201703432
M3 - Article
C2 - 29372583
AN - SCOPUS:85041077598
VL - 14
JO - Small
JF - Small
SN - 1613-6810
IS - 8
M1 - 1703432
ER -