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| Preparations and Characterization of Flexible Pressures Sensors Based on Cellulosic Substrate |
| Received:January 01, 2019 |
| DOI：10.11981/j.issn.1000-6842.2020.01.26 |
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| Fund Project:河南工程学院博士基金(D2015016)；河南省高等学校重点科研项目(15A430019)。 |
| Author Name | Affiliation | Postcode | | 张浩 | 河南工程学院材料与化学工程学院，河南郑州，450000 | 450000 | | 朱明 | 河南工程学院材料与化学工程学院，河南郑州，450000 | 450000 |
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| Abstract: |
| Multi-walled carbon nanotubes (MWCNTs) were modified by 3-methacryloxy-propyltrimethoxysilane (MPS). The volumetric reversible pressure sensors based on cellulosic substrate and conductive MPS-modified MWCNTs were fabricated in a water bath. The scanning electron microscope (SEM), Fourier transform infrared spectrometer (FT-IR), and X-ray diffractometer (XRD) were used to test the morphology and chemical structure of pressure sensors. Besides, the structural stability of modified MWCNTs, physical and electrical properties of the pressure sensors were characterized. The results showed that the dispersion state of MPS-modified MWCNTs on the surface of the cellulose substrate was uniform. The hydroxyl and C—H groups were introduced into the pressure sensors by the MPS-modified MWCNTs, while the crystal structure of sensors was stable. The resistance of pressure sensor containing 10 wt% MPS-modified MWCNTs only increased by 7.7% after 20 times washing. When the concentration of MWCNTs was 10 wt%, the 55% strain of pressure sensors corresponded to the stress of 87.2 kPa, which was 180.3% higher than that of the pressure sensors containing 1 wt% MWCNTs. Besides this, the increase of the contents of MWCNTs resulted in the improvement of sensitivity of the pressure sensors. With the increase of stress from 0 to 30 kPa, the resistance of pressure sensors containing 10 wt% MPS-modified MWCNTs was decreased by 63.2%. |
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