纤维素基柔性压力传感器及其性能表征

Preparations and Characterization of Flexible Pressures Sensors Based on Cellulosic Substrate

中文关键词:  压力传感器  纤维素  多壁碳纳米管  性能

中文摘要:

      利用3-甲基丙烯酰氧基丙基三甲氧基硅烷（MPS）对多壁碳纳米管（MWCNTs）进行改性，通过水浴成型制备形状可逆的纤维素/MWCNTs空间导电网络并用作柔性压力传感器；利用扫描电子显微镜（SEM）、傅里叶变换红外光谱仪（FT-IR）、X射线衍射仪（XRD）对压力传感器的性能进行表征，探讨了MPS改性MWCNTs的结合牢度及该压力传感器的力学性能和灵敏度。结果表明，MPS改性MWCNTs可均匀分散在纤维素基材表面，使得传感器结构中羟基和C—H单元增多，但对基材的结晶结构影响不显著；含10 wt% MPS改性MWCNTs的压力传感器经20次洗涤后的电阻值较洗涤前仅提高了7.7%，导电性能略微降低；当应变量为55%、MPS改性MWCNTs含量由1 wt%增至10 wt%时，压力传感器所需应力提高了180.3%，达87.2 kPa；压力传感器的灵敏度总体随着MPS改性MWCNTs含量的增加而提高，当MPS改性MWCNTs含量为10 wt%时，外界压强从0提高至30 kPa会使压力传感器电阻值降低63.2%。

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%.