Highly Sensitive Mechano-Optical Strain Sensor Based on 2D Material for Human Quality Gaits Monitoring and High-End Robotic Applications

2021 ◽  
Author(s):  
Haris Khan ◽  
Afaque Manzoor Soomro ◽  
Abdul Samad ◽  
Irfan Ullah ◽  
Muhammad Waqas ◽  
...  
Keyword(s):  
Strain Sensor ◽  
Cyclic Stability ◽  
2D Material ◽  
Highly Sensitive ◽  
Optical Strain ◽  
Human Quality ◽  
Flex Sensors ◽  
Robotic Applications

Recently, myriad stretchable flex sensors have been developed based on the principle of changing piezo resistance, capacitance and impedance. However, these approaches suffer from cyclic stability, poor hysteresis, relatively lower...

scholarly journals Development of Highly Sensitive Strain Sensor Using Area-Arrayed Graphene Nanoribbons

Nanomaterials ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 1701
Author(s):  
Ken Suzuki ◽  
Ryohei Nakagawa ◽  
Qinqiang Zhang ◽  
Hideo Miura
Keyword(s):  
Graphene Nanoribbons ◽  
Strain Sensor ◽  
Strain Sensors ◽  
Sensitive Strain ◽  
Bending Test ◽  
Gauge Factor ◽  
Four Point Bending ◽  
Current Voltage ◽  
Highly Sensitive ◽  
Current Voltage Relationship

In this study, a basic design of area-arrayed graphene nanoribbon (GNR) strain sensors was proposed to realize the next generation of strain sensors. To fabricate the area-arrayed GNRs, a top-down approach was employed, in which GNRs were cut out from a large graphene sheet using an electron beam lithography technique. GNRs with widths of 400 nm, 300 nm, 200 nm, and 50 nm were fabricated, and their current-voltage characteristics were evaluated. The current values of GNRs with widths of 200 nm and above increased linearly with increasing applied voltage, indicating that these GNRs were metallic conductors and a good ohmic junction was formed between graphene and the electrode. There were two types of GNRs with a width of 50 nm, one with a linear current–voltage relationship and the other with a nonlinear one. We evaluated the strain sensitivity of the 50 nm GNR exhibiting metallic conduction by applying a four-point bending test, and found that the gauge factor of this GNR was about 50. Thus, GNRs with a width of about 50 nm can be used to realize a highly sensitive strain sensor.

A real time optical strain sensor based on a cholesteric liquid crystal network

RSC Advances ◽  
2013 ◽  
Vol 3 (41) ◽  
pp. 18794 ◽  
Author(s):  
Olivier T. Picot ◽  
Mian Dai ◽  
Emiliano Billoti ◽  
Dirk J. Broer ◽  
Ton Peijs ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Real Time ◽  
Cholesteric Liquid Crystal ◽  
Strain Sensor ◽  
Crystal Network ◽  
Optical Strain

Largely Deformable and Highly Sensitive Strain Sensor Using Carbon Nanomaterials

2017 ◽  
Author(s):  
Kanji Yumoto ◽  
Ken Suzuki ◽  
Hideo Miura
Keyword(s):  
Aspect Ratio ◽  
Growth Condition ◽  
Electrical Resistance ◽  
Carbon Nanomaterials ◽  
Flexible Substrate ◽  
Strain Sensor ◽  
Sensitive Strain ◽  
Synthesis Process ◽  
Pressure Sensitivity ◽  
Highly Sensitive

A new type tactile sensor with spatial resolution less than 1 mm and the minimum pressure sensitivity less than 10 kPa was proposed by applying MWCNTs (Multi-Walled Carbon Nanotubes). The sensor was embedded into a highly deformable flexible substrate (PDMS: Polydimethylsiloxane) and the obtained gauge factor of the developed sensor was about 5. Since the electronic properties of MWCNTs vary drastically depending on their deformation under mechanical stress, it is important to make appropriate aspect ratio of MWCNTs for improving their stress-sensitivity. The aspect ratio of MWCNTs are mainly dominated by their growth condition such as the average thickness of catalyst layer, growth temperature, pressure of resource gases and so on. Thus, the optimum growth condition was investigated for forming the MWCNTs with high aspect ratio, in other words, high pressure sensitivity. In addition, in this study, the authors fabricated high quality carbon nano-materials to develop highly sensitive strain sensor. A thermal CVD synthesis process of MWCNTs was developed by using acetylene gas. After the synthesis of MWCNTs, flexible isolation material (PDMS) was coated around the grown MWCNT. Then, the interconnection film was deposited by sputtering. After that, PDMS was coated again to fabricate an upper protection layer. Finally, the bottom interconnection layer was sputtered and patterned. The change of the electrical resistance of the grown MWCNTs was measured by applying a compression test in the load range from 0 to 10 mN. It was found that the electrical resistance of the MWCNTs bundle increased almost linearly with the applied compressive load and this sensor showed the high load sensitivity of 10 mN that is higher than human fingers.

scholarly journals Highly sensitive p-type 4H-SiC van der Pauw sensor

RSC Advances ◽  
2018 ◽  
Vol 8 (6) ◽  
pp. 3009-3013 ◽  
Author(s):  
Tuan-Khoa Nguyen ◽  
Hoang-Phuong Phan ◽  
Jisheng Han ◽  
Toan Dinh ◽  
Abu Riduan Md Foisal ◽  
...  
Keyword(s):  
Silicon Carbide ◽  
Strain Sensor ◽  
Highly Sensitive ◽  
Van Der Pauw ◽  
P Type ◽  
First Time

This paper presents for the first time a p-type 4H silicon carbide (4H-SiC) van der Pauw strain sensor by utilizing the strain induced effect in four-terminal devices.

Polydiacetylene hydrogel self-healing capacitive strain sensor

2020 ◽  
Vol 8 (18) ◽  
pp. 6034-6041 ◽  
Author(s):  
V. Kesava Rao ◽  
Nitzan Shauloff ◽  
XiaoMeng Sui ◽  
H. Daniel Wagner ◽  
Raz Jelinek
Keyword(s):  
Strain Sensor ◽  
Mechanical Deformation ◽  
Human Motion ◽  
Self Healing ◽  
Highly Sensitive ◽  
Capacitive Strain

Highly sensitive and stretchable PDA–PAA–Cr3+ hydrogel capacitive strain sensor is fabricated and used to monitor mechanical deformation and human motion.

Retracted Article: 3D printed highly flexible strain sensor based on TPU–graphene composite for feedback from high speed robotic applications

2019 ◽  
Vol 7 (16) ◽  
pp. 4692-4701 ◽  
Author(s):  
Jahan Zeb Gul ◽  
Memoon Sajid ◽  
Kyung Hyun Choi
Keyword(s):  
High Speed ◽  
Thermoplastic Polyurethane ◽  
Three Dimensional ◽  
Strain Sensor ◽  
Graphene Composite ◽  
Retracted Article ◽  
3D Printed ◽  
Resistive Type ◽  
Flexible Strain Sensor ◽  
Robotic Applications

A novel, highly flexible and electrically resistive-type strain sensor with a special three-dimensional conductive network was 3D printed using a composite of conductive graphene pellets and flexible thermoplastic polyurethane (TPU) pellets.

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