Patterning and growth of carbon nanotubes on a highly structured 3D substrate surface

Su, Wang-Shen; Lin, Chia‐Jung; Chen, Ting-Hsien; Fang, Weileun

doi:10.1088/0960-1317/19/10/105009

Cited by 11 publications

(6 citation statements)

References 32 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This study extends the previous patterning 3D CNT process [26] and CNT-based flexible tactile sensor technology [22] to establish the fabrication processes illustrated in figure 3. Therefore, the patterned CNT sensing elements and metal routings can be implemented on the flexible-polymer substrate with tactile bump and further integrated with the FPC.…”

Section: Fabrication and Resultssupporting

confidence: 66%

Development of patterned carbon nanotubes on a 3D polymer substrate for the flexible tactile sensor application

Fang

2011

J. Micromech. Microeng.

Self Cite

View full text Add to dashboard Cite

We present a design methodology and manufacturing process for the construction of articulated three-dimensional microstructures with features on the micron to centimeter scale. Flexure mechanisms and assembly folds result from the bulk machining and lamination of alternating rigid and compliant layers, similar to rigid-flex printed circuit board construction. Pop-up books and other forms of paper engineering inspire designs consisting of one complex part with a single assembly degree of freedom. Like an unopened pop-up book, mechanism links reside on multiple interconnected layers, reducing interference and allowing folding mechanisms of greater complexity than achievable with a single folding layer. Machined layers are aligned using dowel pins and bonded in parallel. Using mechanical alignment that persists during bonding allows device layers to be anisotropically pre-strained, a feature we exploit to create self-assembling structures. These methods and three example devices are presented.

show abstract

Section: Fabrication and Resultssupporting

confidence: 66%

Development of patterned carbon nanotubes on a 3D polymer substrate for the flexible tactile sensor application

Fang

2011

J. Micromech. Microeng.

Self Cite

View full text Add to dashboard Cite

show abstract

“…Most of these studies have fabricated planar polymer nanocomposites as strain sensors. Although CNT can provide unique properties to a polymeric structure, it is still a challenge to integrate CNTs within the structure for further applications [54][55][56]. Furthermore, numerous polymer micromachining processes have been recently developed to implement polymer-based flexible sensors [57,58] Therefore, in this paper, nanocomposite ultrasensitive proximity sensor exhibits a simple flexible nanostructure compared with previous studies, but with complex microstructure in which CNTs are melt-mixed in the mold substrate thermoplastic polyurethane (TPU).…”

Section: Introductionmentioning

confidence: 96%

Mathematical Model and Experimental Design of Nanocomposite Proximity Sensors

et al. 2020

View full text Add to dashboard Cite

A mathematical model of fringe capacitance for a nano-based proximity sensor, which takes the presence of different resistivities into account, is developed. An analytical solution obtained for a rectangular-shape sensor with applying of Gauss, Conversation of Charge and Ohm laws into Laplace's equation 2 ( , , , ) = 0 gives the electric potential distribution by which the fringe capacitance in a 2D domain area can be calculated. The calculated capacitance evidently decreases drastically due to the fringe phenomena while object moves toward the polymeric sensor. The model also asserts that the change of capacitance is under a noticeable influence of sensor resistivity, particularly in the range of 10 3 -10 5 Ω.m, the initial capacitance varies from 0.045pF to 0.024 pF. The fabricated flexible nanocomposite sensors, Thermoplastic Polyurethane (TPU) reinforced by 1wt.% Carbon Nanotubes (CNTs) having resistivity 10P 5 P Ω.m, are capable of detecting presence of an external object in a wide range of distance and indicating remarkable correlation with the mathematical solution.Our proximity sensor fabrication is straightforward and relatively simple. An unprecedented detection range of measurement reveals promising ability of this proximity sensor in applications of motion analysis and healthcare systems.

show abstract

“…Different processes have been typically employed to fabricate CNT-polymer nanocomposites sensors, such as mechanical stirring, vacuum filtration, nanoimprint lithography and inkjet printing 55 ; however, shaping CNTs in an uniform line pattern as sensing elements are reported to be very complex by these methods 58,59 . Although CNT can provide unique properties to a polymeric structure, it is still a challenge to integrate CNTs within the structure for further applications [60][61][62] . Furthermore, numerous processes of polymer micromachining have been newly developed to employ in polymer-based flexible sensors 63,64 .…”

mentioning

confidence: 99%

Thermoplastic polyurethane flexible capacitive proximity sensor reinforced by CNTs for applications in the creative industries

Moheimani

Aliahmad

Aliheidari

et al. 2021

Sci Rep

View full text Add to dashboard Cite

Wearable sensing platforms have been rapidly advanced over recent years, thanks to numerous achievements in a variety of sensor fabrication techniques. However, the development of a flexible proximity sensor that can perform in a large range of object mobility remains a challenge. Here, a polymer-based sensor that utilizes a nanostructure composite as the sensing element has been presented for forthcoming usage in healthcare and automotive applications. Thermoplastic Polyurethane (TPU)/Carbon Nanotubes (CNTs) composites are capable of detecting presence of an external object in a wide range of distance. The proximity sensor exhibits an unprecedented detection distance of 120 mm with a resolution of 0.3%/mm. The architecture and manufacturing procedures of TPU/CNTs sensor are straightforward and performance of the proximity sensor shows robustness to reproducibility as well as excellent electrical and mechanical flexibility under different bending radii and over hundreds of bending cycles with variation of 4.7% and 4.2%, respectively. Tunneling and fringing effects are addressed as the sensing mechanism to explain significant capacitance changes. Percolation threshold analysis of different TPU/CNT contents indicated that nanocomposites having 2 wt% carbon nanotubes are exhibiting excellent sensing capabilities to achieve maximum detection accuracy and least noise among others. Fringing capacitance effect of the structure has been systematically analyzed by ANSYS Maxwell (Ansoft) simulation, as the experiments precisely supports the sensitivity trend in simulation. Our results introduce a new mainstream platform to realize an ultrasensitive perception of objects, presenting a promising prototype for application in wearable proximity sensors for motion analysis and artificial electronic skin.

show abstract

Patterning and growth of carbon nanotubes on a highly structured 3D substrate surface

Cited by 11 publications

References 32 publications

Development of patterned carbon nanotubes on a 3D polymer substrate for the flexible tactile sensor application

Development of patterned carbon nanotubes on a 3D polymer substrate for the flexible tactile sensor application

Mathematical Model and Experimental Design of Nanocomposite Proximity Sensors

Thermoplastic polyurethane flexible capacitive proximity sensor reinforced by CNTs for applications in the creative industries

Contact Info

Product

Resources

About