Fabrication of a Flexible and Transparent Touch Sensor Using Single-Walled Carbon Nanotube Thin-Films

Choi, Eugene; Kim, Jin Oh; Chun, Sungwoo; Kim, Ahsung; Lee, Kunhak; Jeong, Min-ho; Lim, Chaehyun; Isoshima, Takashi; Hara, Masahiko; Lee, Seung‐Beck

doi:10.1166/jnn.2011.4450

Cited by 9 publications

(4 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…1 mm-thick PDMS substrates, which were mixed in a 1:10 ratio of curing agent and base, were swollen by dipping into organic solvents for 24 h (figure 2(b)). The CNTN with 25 nm thickness on anodic aluminum oxide (AAO) membrane filter was transferred to the swollen PDMS by using a stamping method [23] (figure 2(c)). Finally, the CNTN on PDMS was dried for 24 h at room temperature and as a result, the buckling CNTN was produced (figure 2(d)).…”

Section: Fabricationmentioning

confidence: 99%

Buckled carbon nanotube network thin-film fabricated using chemically swelled elastomer substrates

Kim¹,

Choi²,

Jung³

et al. 2019

Nanotechnology

Self Cite

View full text Add to dashboard Cite

We report on the fabrication of buckled carbon nanotube thin-film networks (CNTN) that increases in conductivity with applied tactile pressure. When tactile pressure was applied, the buckled nanotubes collapsed and increased in interconnected density and as a result increased the thin-film conductivity. Unlike conventional methods using mechanically expanded elastomers, we utilize chemically swollen elastomers as the expanded substrate to transfer the CNTN. As the chemical evaporates, it compresses the CNTN causing the thin-film to buckle. The CNTN compression can be controlled by using organic solvents with differing elastomer absorption rates. Our method requires no mechanical instruments and shows in-plane multi-axial uniform strain for the entire substrate surface. Since the buckling was controlled chemically, the buckled CNTN can be produced reliably, furthering the possibility of its application as the active sensing material for highly sensitive tactile pressure sensors.

show abstract

Section: Fabricationmentioning

confidence: 99%

Buckled carbon nanotube network thin-film fabricated using chemically swelled elastomer substrates

Kim¹,

Choi²,

Jung³

et al. 2019

Nanotechnology

Self Cite

View full text Add to dashboard Cite

show abstract

“…Single-walled carbon nanotube networks (SWCNT-N) are of great interest for many application areas that utilize transparent conductive films and would benefit from flexibility and high transparency, such as flat panel displays, touch sensors, solar cell electrodes, etc. As ∼1/3 of the aerosol-CVD nanotubes are metallic and ∼2/3 are semiconducting, low-density SWCNT-Ns are required for high-performance thin film transistors (TFTs). − At high densities, metallic nanotubes form metallic pathways between the source and the drain electrodes, leading to a poor response to gate modulation.…”

Section: Introductionmentioning

confidence: 99%

Spatially Resolved Transport Properties of Pristine and Doped Single-Walled Carbon Nanotube Networks

et al. 2013

View full text Add to dashboard Cite

We use noninvasive atomic force microscopy to probe the spatial electrical conductivity of isolated junctions of pristine and nitric acid treated single-walled carbon nanotube networks (SWCNT-N). By analyzing the local IV curves of SWCNTs and bundles with various diameters, the resistance per unit length and the contact resistance of their junctions are estimated to be 3–16 kΩ/μm and 29–532 kΩ, respectively. We find that the contact resistance decreases with increasing SWCNT or bundle diameter and depends on the contact morphology, reaching a value of 29 kΩ at a diameter of 10 nm. A nitric acid treatment moderately dopes SWCNTs and reduces their average contact resistance by a factor of 3 while the resistance of the nanotubes remains largely unaltered. Remarkably, the same treatment on an SWCNT-N shows similar reduction in the sheet resistance by a factor of 4. These results suggest that the resistance reduction mechanism is related to the contact modulation with no major impact on conductance of SWCNTs.

show abstract

“…Then PDMS base with mixed cross-linker was poured on the master and cured. After removing the PDMS layer from the master, the CNTF that was prepared by vacuum filtration, was transferred to the flat side of the mold [27]. For fixation of the CNTF, a 20-nm thick Cr/Au film was deposited.…”

Section: Fabrication Processmentioning

confidence: 99%

Spatially digitized tactile pressure sensors with tunable sensitivity and sensing range

et al. 2014

Self Cite

View full text Add to dashboard Cite

When developing an electronic skin with touch sensation, an array of tactile pressure sensors with various ranges of pressure detection need to be integrated. This requires low noise, highly reliable sensors with tunable sensing characteristics. We demonstrate the operation of tactile pressure sensors that utilize the spatial distribution of contact electrodes to detect various ranges of tactile pressures. The device consists of a suspended elastomer diaphragm, with a carbon nanotube thin-film on the bottom, which makes contact with the electrodes on the substrate with applied pressure. The electrodes separated by set distances become connected in sequence with tactile pressure, enabling consecutive electrodes to produce a signal. Thus, the pressure is detected not by how much of a signal is produced but by which of the electrodes is registering an output. By modulating the diaphragm diameter, and suspension height, it was possible to tune the pressure sensitivity and sensing range. Also, adding a fingerprint ridge structure enabled the sensor to detect the periodicity of sub-millimeter grating patterns on a silicon wafer.

show abstract

Fabrication of a Flexible and Transparent Touch Sensor Using Single-Walled Carbon Nanotube Thin-Films

Cited by 9 publications

References 0 publications

Buckled carbon nanotube network thin-film fabricated using chemically swelled elastomer substrates

Buckled carbon nanotube network thin-film fabricated using chemically swelled elastomer substrates

Spatially Resolved Transport Properties of Pristine and Doped Single-Walled Carbon Nanotube Networks

Spatially digitized tactile pressure sensors with tunable sensitivity and sensing range

Contact Info

Product

Resources

About