Two-Dimensional Strain-Distribution Sensor Using Carbon Nanotube-Dispersed Resin

2011 ◽  
Author(s):  
Yusuke Suzuki ◽  
Yusuke Ohashi ◽  
Masato Ohnishi ◽  
Ken Suzuki ◽  
Hideo Miura
Keyword(s):  
Carbon Nanotubes ◽  
Density Functional ◽  
Axial Strain ◽  
Electronic Conductivity ◽  
Applied Strain ◽  
Sensitive Strain ◽  
Two Dimensional ◽  
Electric Resistance ◽  
Highly Sensitive ◽  
Walled Carbon Nanotubes

A new highly sensitive strain measurement method has been developed by applying the change of the electronic conductivity of CNTs. It is reported that most multi-walled carbon nanotubes (MWCNTs) show metallic conductivity and they are rather cheap comparing with single-walled carbon nanotubes (SWCNTs). The effect of the longitudinal axial strain on the band structures of electrons in CNTs was analyzed by applying the abinitio calculation based on the density functional theory. The change of the band structure of a MWCNT under uni-axial strain was analyzed. It was found that the electric conductivity of (MWCNTs) changes drastically because of the large change of their band gap. Therefore, the authors have focused on the possibility of the application of MWCNTs to a highly sensitive strain sensor. Multi-walled CNTs were dispersed in various kinds of resins such as epoxy, polycarbonate, and polyisoprene to form a thin film which can be easily attached to rounded surfaces. The length and diameter of the CNTs were about 5 μm and 50 nm, respectively. One of the base materials of resin employed was polycarbonate and the volumetric concentration of CNT dispersed was about 11.5%. The thickness of the film was about 500 μm. Uni-axial strain was applied to the CNT-dispersed resin by applying a 4 point bending method, and the change of the electric resistance was measured. The range of the applied strain was from −0.025% to 0.025%. The electric resistance changed almost linearly with the applied strain. The ratio of the resistance change under the tensile strain was about 400%/%strain and that under the compressive strain was about 150%/%strain. The CNTs were also dispersed in polyisoprene by about 5%. Uni-axial tesile strain was also applied to the CNT-dispersed rubber. The maximum strain was 240%. It was found that the resistance of the rubber increased monotonically with the increase of the amplitude of the applied strain. The increase rate also increased with the amplitude of the applied strain, and the maximum rate reached about 25%/%strain. Two-dimensional strain fields were evaluated by using finely area-arrayed CNT-dispersed resin made by MEMS technology with spatial resolution of 50 μm.

Highly Sensitive 2D Strain Sensor Using Carbon Nanotube

2013 ◽  
Author(s):  
Hiroshi Kawakami ◽  
Masato Ohnishi ◽  
Ken Suzuki ◽  
Hideo Miura
Keyword(s):  
Carbon Nanotubes ◽  
Compressive Strain ◽  
Electronic Conductivity ◽  
Strain Sensor ◽  
Applied Strain ◽  
Uniaxial Strain ◽  
Sensitive Strain ◽  
Highly Sensitive ◽  
2D Strain ◽  
Walled Carbon Nanotubes

A new highly sensitive strain measurement method has been developed by applying the strain-induced change of the electronic conductivity of CNTs. It is reported that most multi-walled carbon nanotubes (MWCNTs) show metallic conductivity and they are rather cheap comparing with single-walled carbon nanotubes (SWCNTs). However, it was found that the electric conductivity of MWCNTs changes drastically under uniaxial strain because of the drastic change of their band gap. Therefore, the authors have developed a highly sensitive strain sensor which can detect the local strain distribution by using MWCNTs. In order to design a new sensor using MWCNT, it is very important to control the shape of the MWCNTs under strain. Thus, a method for controlling the shape of the MWCNTs was developed by applying a chemical vapor deposition (CVD) technique. It was found that the shape of the grown MWCNT could be controlled by changing the average thickness of the catalyst and the deposition temperature of the MWCNT. The electrical resistance of the grown MWCNT changed almost linearly with the applied strain, and the maximum strain sensitivity obtained under the application of uniaxial strain was about 10%/1000-μstrain (gauge factor: 100). A two-dimensional strain sensor, which consists of area-arrayed fine bundles of MWCNTs, has been developed by applying MEMS technology. Under the application of compressive strain, the electric resistance was confirmed to increase almost linearly with the applied strain.

Remote Strain Measurement by Multi-Walled Carbon Nanotube-Dispersed Resin

2009 ◽  
Author(s):  
Katsuya Osaki ◽  
Hideki Fuji ◽  
Masato Onishi ◽  
Ken Suzuki ◽  
Hideo Miura
Keyword(s):  
Strain Measurement ◽  
Tensile Strain ◽  
Axial Strain ◽  
Compressive Strain ◽  
Electronic Conductivity ◽  
Applied Strain ◽  
Dynamic Strain ◽  
Electric Resistance ◽  
Resistance Change ◽  
Base Materials

A new remote strain measurement method has been developed by applying the highly sensitive change of electronic conductivity of CNTs. Multi-walled CNTs were dispersed in various kinds of resins to form a thin film which can be attached rounded surfaces. The length of the CNTs was about a few μm. One of the base materials of resin employed was polycarbonate and the volumetric concentration of CNT dispersed was about 11.5%. The thickness of the film was about 500 μm. An uni-axial strain was applied to the CNT-dispersed resin by applying a 4 point bending method, and the change of the electric resistance was measured. The range of the applied strain was from −0.025% to 0.025%. The electric resistance changed almost linearly with the applied strain. The ratio of the resistance change under the tensile strain was about 40%/1000-μstrain and that under the compressive strain was about 15%/1000-μstrain. The micro wave of 99.5 GHz was irradiated to the CNT-dispersed polycarbonate film through the metallic prove 1 mm in diameter. The change of the intensity of the beam reflected from the film was measured by changing the amplitude of the uni-axial in-plane strain applied to the film. The intensity of the reflected beam increased almost linearly with the increase of the applied tensile strain and the change rate of the intensity was about 0.5%/1000-μstrain. This result clearly indicated that the surface dynamic strain can be detected by micro wave nondestructively and remotely.

scholarly journals Sensors Based on Amino Group Surface-Modified CNTs

Chemosensors ◽  
2019 ◽  
Vol 7 (1) ◽  
pp. 11 ◽  
Author(s):  
Natalia Boroznina ◽  
Irina Zaporotskova ◽  
Sergey Boroznin ◽  
Evgeniy Dryuchkov
Keyword(s):  
Carbon Nanotubes ◽  
Density Functional ◽  
High Sensitivity ◽  
Dft Method ◽  
Molecular Cluster ◽  
Highly Sensitive ◽  
The Density Functional Theory ◽  
Sensitive Sensor ◽  
Surface Modified ◽  
Walled Carbon Nanotubes

This article discusses the possibility of the fabrication of a highly sensitive sensor based on single-walled carbon nanotubes surface modified with functional amino groups (-NH2). The sensor potential for detection of alkali (sodium, lithium, and potassium) metals was investigated. The results of computer simulation of the interaction process between the sensor and an arbitrary surface of the modified tube containing atoms of the studied metals are presented. The calculations were carried out within the framework of the density functional theory (DFT) method using the molecular cluster model. It has been proved that surface-modified ammonium carbon nanotubes show high sensitivity for the metal atoms under study.

Anisotropic Strain-Field-Induced Change of the Electronic Conductivity of Graphene Sheets and Carbon Nanotubes

2012 ◽  
Author(s):  
Masato Ohnishi ◽  
Hiroshi Kawakami ◽  
Yusuke Suzuki ◽  
Ken Suzuki ◽  
Hideo Miura
Keyword(s):  
Carbon Nanotubes ◽  
Density Functional ◽  
Electronic Conductivity ◽  
Deformation Characteristic ◽  
Strain Sensor ◽  
Functional Theory ◽  
Highly Sensitive ◽  
Mems Technology ◽  
Stable Performance ◽  
The Relationship

Since the discovery of carbon nanotubes (CNTs), there have been many efforts to develop various electronic devices and sensors. The authors have also validated the possibility of a highly sensitive strain sensor using popular resin in which multi-walled CNTs (MWNTs) were dispersed uniformly. It is, however, indispensable for clarifying how to change the electronic state of a deformed CNT for assuring the stable performance of the sensor because the reported sensitivity has ranged widely. In this study, the relationship between the deformation characteristic of a CNT under strain and its electronic conductivity was analyzed quantitatively. The analysis result obtained from density functional theory (DFT) calculation showed that the orbital hybridization was occured when the local curvature exceeded about 0.3 Å−1, inducing the decrease in the band gap. Based on the analytical results, a two-dimensional strain sensor was developed by applying buckling deformation-induced conductivity change of MWNTs by using MEMS technology.

Mechanical Properties of Single-Walled Carbon Nanotubes under Large Axial Deformation

2010 ◽  
Vol 97-101 ◽  
pp. 3910-3915
Author(s):  
Kun Cai
Keyword(s):  
Carbon Nanotubes ◽  
Axial Strain ◽  
Single Walled Carbon Nanotubes ◽  
Mapping Method ◽  
Axial Deformation ◽  
Engineering Strain ◽  
Single Walled Carbon ◽  
Graphitic Sheet ◽  
Zigzag Pattern ◽  
Walled Carbon Nanotubes

The deformation of single-walled carbon nanotubes (SWCNTs) under large axial strain is studied by a geometrical mapping method. The interactions between atoms in carbon nanotubes (CNTs) are described by Tersoff-Brenner potential. Results show the strain energy depends on chirality but hardly on tubes’ radii. For graphitic sheet under large axial deformation, the elastic moduli decrease with the increase of engineering strain under tension. The modulus reaches the peak value as the axial engineering strain reaches -0.08 for armchair pattern and -0.15 for zigzag pattern under compression.

Large-scale fabrication of a flexible, highly conductive composite paper based on molybdenum disulfide–Pt nanoparticle–single-walled carbon nanotubes for efficient hydrogen production

2017 ◽  
Vol 53 (2) ◽  
pp. 380-383 ◽  
Author(s):  
I-Wen Peter Chen ◽  
Yu-Xiang Chen ◽  
Chien-Wei Wu ◽  
Chun-Chien Chiu ◽  
Yu-Chieh Hsieh
Keyword(s):  
Carbon Nanotubes ◽  
Hydrogen Production ◽  
Molybdenum Disulfide ◽  
Large Scale ◽  
Single Walled Carbon Nanotubes ◽  
Two Dimensional ◽  
Pt Nanoparticle ◽  
Two Dimensional Materials ◽  
Walled Carbon Nanotubes ◽  
Composite Paper

Creating efficient hydrogen production properties from the macroscopic assembly of two-dimensional materials is still an unaccomplished goal.

Sign in / Sign up

Export Citation Format

Share Document