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Large-Area Flexible Printed Thin-Film Transistors with Semiconducting Single-Walled Carbon Nanotubes for NO 2 Sensors.
- Source :
-
ACS applied materials & interfaces [ACS Appl Mater Interfaces] 2020 Nov 18; Vol. 12 (46), pp. 51797-51807. Date of Electronic Publication: 2020 Nov 03. - Publication Year :
- 2020
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Abstract
- Development of large-area, low-cost, low-voltage, low-power consumption, flexible high-performance printed carbon nanotube thin-film transistors (TFTs) is helpful to promote their future applications in sensors and biosensors, wearable electronics, and the Internet of things. In this work, low-voltage, flexible printed carbon nanotube TFTs with a large-area and low-cost fabrication process were successfully constructed using ultrathin (∼3.6 nm) AlO <subscript> x </subscript> thin films formed by plasma oxidation of aluminum as dielectrics and screen-printed silver electrodes as contact electrodes. The as-prepared bottom-gate/bottom-contact carbon nanotube TFTs exhibit a low leakage current (∼10 <superscript>-10</superscript> A), a high charge carrier mobility (up to 9.9 cm <superscript>2</superscript> V <superscript>-1</superscript> s <superscript>-1</superscript> ), high on/off ratios (higher than 10 <superscript>5</superscript> ), and small subthreshold swings (80-120 mV/dec) at low operation voltages (from -1.5 to 1 V). At the same time, printed carbon nanotube TFTs showed a high response (Δ R / R = 99.6%) to NO <subscript>2</subscript> gas even at 16 ppm with a faster response and recovery speed (∼8 s, exposure to 0.5 ppm NO <subscript>2</subscript> ), a lower detection limit (0.069 ppm NO <subscript>2</subscript> ), and a low power consumption (0.86 μW, exposure to 16 ppm NO <subscript>2</subscript> ) at a gate voltage of 0.2 V at room temperature. Moreover, the printed carbon nanotube devices exhibited excellent mechanical flexibility and bias stress stability after 12,000 bending cycles at a radius of 5 mm and a bias stress test for 7200 s at a gate voltage of ±1 V, which originated from the ultrathin and compact AlO <subscript> x </subscript> dielectric and the super adhesion force between screen-printed silver electrodes and polyethylene terephthalate substrates.
Details
- Language :
- English
- ISSN :
- 1944-8252
- Volume :
- 12
- Issue :
- 46
- Database :
- MEDLINE
- Journal :
- ACS applied materials & interfaces
- Publication Type :
- Academic Journal
- Accession number :
- 33141551
- Full Text :
- https://doi.org/10.1021/acsami.0c13824