A Flexible and Highly Sensitive Piezoresistive Pressure Sensor Based on Micropatterned Films Coated with Carbon Nanotubes

Yao, Jialin; Yang, Xing; Shao, Na; Luo, Hui; Zhang, Ting; Jiang, Wu-Gui

doi:10.1155/2016/3024815

Cited by 10 publications

(7 citation statements)

References 23 publications

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“…These results show that addition of nanoscale topography is the most effective element to reduce macrophage fusion. Many scientists have engineered biomedical implants with microtopographical features to improve osteointegration, create vascular grafts, and enhance sensitivity of implantable sensors. − Our work suggests the critical importance of creating hierarchical structures to retain the advantageous properties that microtopography affords while reducing FBR with the use of nanotopography.…”

Section: Resultsmentioning

confidence: 94%

Hierarchical Micro- and Nanopatterning of Metallic Glass to Engineer Cellular Responses

Wang

Loye

Ketkaew

et al. 2018

ACS Appl. Bio Mater.

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Nano and micropatterning of biomaterials is a rapidly evolving technology used in the engineering sciences to control cell behavior. Specifically, altering the topographies and hence surface mechanical properties has been shown to induce changes in cell morphology and function. Here, we show a method for fabricating hierarchical micro- and nanopatterns of Pt57.5Cu14.7Ni5.3P22.5 (Pt-BMG) on the relevant length scales comparable to that of proteins and cells. Leveraging the amorphous nature of Pt-BMGs, we have a versatile toolbox to manipulate patterns on the nano/micro level and combine multiple length scales to examine specific cell responses. We assay the morphology of macrophages and fibroblasts, two cell types critical to the foreign body response. Furthermore, we show that nanotopography is critical for reducing macrophage fusion and that high levels of fusion on both unpatterned and micropatterned substrates can be mitigated with the addition of nanotopographical features. Interestingly, we show that the wetting ability of the substrates does not correlate with cellular responses on these substrates. Our results suggest that the different topographical length scales can be used to systematically affect corresponding cell-type-specific responses.

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Section: Resultsmentioning

confidence: 94%

Hierarchical Micro- and Nanopatterning of Metallic Glass to Engineer Cellular Responses

Wang

Loye

Ketkaew

et al. 2018

ACS Appl. Bio Mater.

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“…This is consistent with the results of the DC electrical conductivity shown in figure 4. For all nanocomposites, σ e ' remains constant (resistive-like behavior) at low frequencies and increases linearly at higher frequencies (capacitive-like behavior), leveling off as f approaches ~10 7 Hz. The critical frequency (f c ) at which the trend of σ e ' changes (from resistive to capacitive), varies depending on the MLGS/MWCNT ratio, Φ R .…”

Section: Electrical Properties In Alternating Currentmentioning

confidence: 95%

“…The properties of these smart materials may be further engineered to develop sensors and actuators. At present, an important scientific and technological aim is to develop flexible materials that can be used as pressure and/or deformation (strain) sensors for multifunctional applications in biomedical devices, prostheses, piping, electronic skin, and robotics, to name a few [4][5][6][7][8][9][10][11]. Particularly, in the fields of robotics and biomedicine, there is a strong demand for flexible materials in tubular form working under pneumatic mechanisms, which are capable to self-measure their strain and internal pressure during service [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Electro-mechanical properties of thermoplastic polyurethane films and tubes modified by hybrid carbon nanostructures for pressure sensing

Pérez-Aranda¹,

Valdez-Nava²,

Gamboa³

et al. 2020

Smart Mater. Struct.

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Electrical and piezoresistive properties of hybrid nanocomposite films and tubes made of a segmented aliphatic polyurethane modified with multilayer graphene sheets (MLGSs), multiwall carbon nanotubes (MWCNTs), and hybrid mixtures of both, were investigated.Hybrid nanocomposites were fabricated at a total weight concentration ( ) of 5 wt.%, with relative weight concentration of MLGSs with respect to MWCNTs ( ) of 25%, 50% and 75%. The electrical conductivity of these films is dominated by the MWCNT network, observing electrical MLGS-MWCNT collaborative effects only for = 25%. Dielectric impedance spectroscopy indicates that the nanocomposites display capacitive effects at frequencies higher than tens of Hz, which is explained by interfacial polarization. The burst pressure and circumferential stiffness of internally pressurized tubes fabricated from these films is slightly higher for tubes containing only MWCNTs. The strain fields in the pressurized tubes, determined by digital image correlation, showed localized strain gradients, and the piezoresistive response of the electro-conductive tubes was nonlinear. The highest pressure-sensing factor (4.59 kPa -1 ) was obtained for hybrid nanocomposite tubes with = 25%.

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“…Most scholars have attempted to synthesize functional materials in order to simultaneously attain sensor flexibility and conductivity. The active materials with excellent conductivity, like metal particles [11], metal nanowires [12], carbon black [4,13,14], graphene [15], and carbon nanotubes [16,17,18,19,20], are usually combined with a flexible substrate material, creating functional materials with excellent conductivity and flexibility.…”

Section: Introductionmentioning

confidence: 99%

A High Sensitive Flexible Pressure Sensor Designed by Silver Nanowires Embedded in Polyimide (AgNW-PI)

Ding

Yang

2019

Micromachines

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Silver nanowires (AgNW) have excellent electrical conductivity, transparency, and flexing endurance, and are broadly used in flexible electrodes and flexible sensors. This study mixed the silver nanowires and polyimide (PI) polymer using an in situ synthesis method, effectively reducing the problem of silver nanowires falling off the substrate. The selective wet etching method was firstly used to process the surface of AgNW-PI films, greatly enhancing the surface conductivity of AgNW-PI films. A flexible pressure sensor with high sensitivity was designed with two face-to-face AgNW-PI ultrathin layers. The experimental results show that our sensor presented a high sensitivity of about 1.3294 kPa−1 under a pressure of about 600 Pa, and when pressure continued to increase, the sensitivity decreased rapidly and reached saturation. Our flexible pressure sensor has the properties of low cost, high sensitivity, excellent repeatability, durability, and can detect various types of mechanical forces which could be utilized for flexible electronics.

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A Flexible and Highly Sensitive Piezoresistive Pressure Sensor Based on Micropatterned Films Coated with Carbon Nanotubes

Cited by 10 publications

References 23 publications

Hierarchical Micro- and Nanopatterning of Metallic Glass to Engineer Cellular Responses

Hierarchical Micro- and Nanopatterning of Metallic Glass to Engineer Cellular Responses

Electro-mechanical properties of thermoplastic polyurethane films and tubes modified by hybrid carbon nanostructures for pressure sensing

A High Sensitive Flexible Pressure Sensor Designed by Silver Nanowires Embedded in Polyimide (AgNW-PI)

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