| Autor: |
Zhongjie Qian, Tianyi Li, Vigneshwar Sakthivelpathi, Sheila M Goodman, Anthony B Dichiara, Alexander V Mamishev, Jae-Hyun Chung |
| Rok vydání: |
2022 |
| Předmět: |
|
| Zdroj: |
Nano Express. 3:025001 |
| ISSN: |
2632-959X |
| DOI: |
10.1088/2632-959x/ac6764 |
| Popis: |
Auxetic materials showing a negative Poisson’s ratio can offer unusual sensing capabilities due to drastic percolation changes. This study presents the capacitive response of wet-fractured carbon nanotube paper composites in exposure to humidity. A strained composite strip is fractured to produce numerous cantilevers consisting of cellulose fibers coated with carbon nanotubes. During stretching, the thin composite buckles in the out-of-plane direction, which causes auxetic behavior to generate the radially structured electrodes. The crossbar junctions forming among the fractured electrodes significantly increase capacitance and its response to humidity as a function of sensor widths. The molecular junctions switch electric characteristics between predominantly resistive- and capacitive elements. The resulting capacitive response is characterized for humidity sensing without the need for an additional absorption medium. The normalized capacitance change (ΔC/C0) exhibits a sensitivity of 0.225 within the range of 40 ∼ 80% relative humidity. The novel auxetic behavior of a water-printed paper-based nanocomposite paves the way for inexpensive humidity and sweat sensors. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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