Microstructured flexible capacitive sensor with high sensitivity based on carbon fiber-filled conductive silicon rubber

Wang, Xuelong; Xia, Zhidong; Zhao, Chen; Huang, Panling; Zhao, Shaofan; Gao, Mu; Nie, Jianguo

doi:10.1016/j.sna.2020.112147

Cited by 44 publications

(37 citation statements)

References 55 publications

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“…Figure 20b shows a single‐chip computer system with five microstructural sensors attached on five glove fingers to replace the function of mouse. [ 125 ] When the capacitance of the sensor on the thumb kept stable, pressing on the other fingers caused the cursor to move. According to this feature, the researchers typed “HELLO” into a computer through combining different gestures.…”

Section: Applications Of Fmpssmentioning

confidence: 99%

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Recent Progress in Flexible Microstructural Pressure Sensors toward Human–Machine Interaction and Healthcare Applications

et al. 2021

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With the rapid growth of artificial intelligence, wearable electronic devices have caught intensive research interest recently. Flexible sensors, as the significant part of them, have become the focus of research. Particularly, flexible microstructural pressure sensors (FMPSs) have attracted extensive attention because of their controllable shape, small size, and high sensitivity. Microstructures are of great significance to improve the sensitivity and response time of FMPSs. The FMPSs present great application prospects in medical health, human–machine interaction, electronic products, and so on. In this review, a series of microstructures (e.g., wave, pillar, and pyramid shapes) which have been elaborately designed to effectively enhance the sensing performance of FMPSs are introduced in detail. Various fabrication strategies of these FMPSs are comprehensively summarized, including template (e.g., silica, anodic aluminum oxide, and bionic patterns), pre‐stressing, and magnetic field regulation methods. In addition, the materials (e.g., carbon, polymer, and piezoelectric materials) used to prepare FMPSs are also discussed. Moreover, the potential applications of FMPSs in human–machine interaction and healthcare fields are emphasized as well. Finally, the advantages and latest development of FMPSs are further highlighted, and the challenges and potential prospects of high‐performance FMPSs are outlined.

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Section: Applications Of Fmpssmentioning

confidence: 99%

Section: Applications Of Fmpssmentioning

confidence: 99%

Recent Progress in Flexible Microstructural Pressure Sensors toward Human–Machine Interaction and Healthcare Applications

et al. 2021

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“…Pressure sensors have always been microstructured to improve their sensitivity to small load, [8][9][10][11][12] otherwise it will be insensitive due to the little strain when compressed. Microstructured pressure sensors can be categorized into piezoelectric, [8] piezoresistive, [9,10] and piezocapacitive type, [11,12] and the comparison between them with the printed resistor is listed as Table 1. The printed resistor is capable of testing the compressive load less than 1 kPa (Figure 4), despite it not being as sensitive as the microstructured pressure sensors.…”

Section: R H D Aementioning

confidence: 99%

“…[1][2][3][4][5][6][7] Filled or coated polymer composites have been widely researched as their outstanding stretchability or compressibility, especially the microstructured sensors with high sensitivity, have been largely reported. [8][9][10][11][12] 3D-printed electronic have been considered as the next frontier in additive manufacturing. [13] The novel preparation process of flexible sensors has further enriched and improved the sensing performance with higher sensitivity, wider working range, lower test limit, conformal wearability, and so on.…”

mentioning

confidence: 99%

Anisotropic Printed Resistor with Linear Sensitivity Based on Nano–Microfiller‐Filled Polymer Composite

Huang

Cao

Wei

et al. 2021

Adv Elect Materials

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Abstract3D printing electronics provides great potential to build structural objects with multiple functionalities, with the assistance of shape design and the shear force on the filler orientation. In the study, nano–microanisotropic sensors with oriented fillers assure its linear sensitive properties, where the sensors are 3D‐printed based upon the carbon fiber (CF)‐ and multiwalled carbon nanotube (MCNT)‐filled polydimethylsiloxane (PDMS). The synergistic effect of CF and MCNT modifies the printability, mechanical properties, and sensitivity of printed sensors. The introduction of anticatalyst and catalyst guarantee the printable mixtures with a stable printability in a long term (>15 days). Assisted by the shear flow, the fillers own the orientation ration of 78.53%, which further contribute to the linear sensing behaviors under the tensile strain of 0–20% and compressive stress of 0–20 kPa. Frequency‐domain signals and visual demonstration on the cyclic stretch test reveal that the double peak is originated from the hysteresis of the strain to applied stress. Anisotropic electromechanical behaviors of the resistors will inspire to quantitatively analyze multidimensional strains in practical applications. The fingerprint inspired resistors with multiple sensing signals further demonstrate the convenience of the printing process on the design of wearable electronics.

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“…Constant input of compressive stress (static characteristics) is desirable to have a stable feedback of electrical signal. However, the flexible composites always suffer from resistance creep, relax or hysteresis when compressed [9][10][11], which is highly related to the viscoelasticity of the flexible matrix. Having been extensively studied, the resistance creep or relaxation under compressive loadings is always analyzed with the effect of loading stress; however, the influence of external electric field is highly ignored and unexplored.…”

Section: Introductionmentioning

confidence: 99%

On the Electrical Resistance Relaxation of 3D-Anisotropic Carbon-Fiber-Filled Polymer Composites Subjected to External Electric Fields

et al. 2021

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Flexible composites as sensors are applied under a small voltage, but the effect of the external electrical field on the resistance is always ignored and unexplored by current research. Herein, we investigate the electrical resistance relaxation of anisotropic composites when they are subjected to an external electric field. The anisotropic composites were 3D-printed based on carbon-fiber-filled silicon rubber. Constant DC voltages were applied to the composites, and the output electrical current increased with time, namely the electrical resistance relax with time. The deflection and migration of carbon fibers are dominantly responsible for the resistance relaxation, and the angle’s evolution of a carbon fiber, under the application and removal of the electrical field, was well observed. The other factor hindering the resistance relaxation is the increased temperature originating from the Joule heating effect. This work provides a new understanding in the working duration and the static characteristics of flexible composites.

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Microstructured flexible capacitive sensor with high sensitivity based on carbon fiber-filled conductive silicon rubber

Cited by 44 publications

References 55 publications

Recent Progress in Flexible Microstructural Pressure Sensors toward Human–Machine Interaction and Healthcare Applications

Recent Progress in Flexible Microstructural Pressure Sensors toward Human–Machine Interaction and Healthcare Applications

Anisotropic Printed Resistor with Linear Sensitivity Based on Nano–Microfiller‐Filled Polymer Composite

On the Electrical Resistance Relaxation of 3D-Anisotropic Carbon-Fiber-Filled Polymer Composites Subjected to External Electric Fields

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