Improved dielectricity of anisotropic wood slices and bioinspired micropatterned film electrodes for highly sensitive flexible electronic sensors. Issue 45 (21st October 2020)

• Record Type: Journal Article
• Authors: Nie, Kangchen; Wang, Zhaosong; Zhou, Hang; Tang, Ruixin; Shen, Xiaoping; Sun, Qingfeng
• Is Part Of: Journal of materials chemistry. Volume 8:Issue 45(2020)
• Page Start: 16113
• Page End: 16120
• Publication Date: 2020-10-21
• Subjects: Materials -- Periodicals; Chemistry, Analytic -- Periodicals; Optical materials -- Research -- Periodicals; Electronics -- Materials -- Research -- Periodicals; 543.0284
• DOI: 10.1039/d0tc03729j
• Languages: English
• ISSNs: 2050-7526

Abstract

Abstract : Taking inspiration and utilizing materials directly from nature, a simple and green strategy to fabricate biomass-based highly sensitive flexible tactile sensors was developed. Abstract : Taking inspiration and utilizing materials directly from nature, a simple and green strategy to fabricate biomass-based highly sensitive flexible tactile sensors was developed. Capacitive sensing devices were constructed by stacking a conductive micropatterned PDMS bottom electrode, an anisotropic wood slice/ionic liquid (IL@wood) dielectric layer and an unpatterned PDMS top electrode. After IL impregnation, the wood cross slice (CS) had an average weight gain rate ( R w ) and an improved relative dielectric constant ( ε r ) of 493.9% and 32.6, respectively, while those of the axial one were 82.1% and 6.6. The sensor made of an IL@wood cross (IL@CS) section and a lotus-leaf-like PDMS/silver nanowire (AgNWs@PDMS) film had a maximum capacitance value in the order of 10 0 μF cm −2 under 80 kPa compression, thereby exhibiting outstanding signal-to-noise ratio and responsive stability of the device. Its sensitivity reached 2.09 kPa −1 without obvious attenuation after 500 cycles. Additionally, it could not only monitor multiple motions including speaking, chewing and wrist bending but also decode handwriting and detect temperature variations.