3D Graphene Films Enable Simultaneously High Sensitivity and Large Stretchability for Strain Sensors

2018 ◽  
Vol 28 (40) ◽  
pp. 1803221 ◽  
Author(s):  
Fei Pan ◽  
Si-Ming Chen ◽  
Yuhan Li ◽  
Zhuchen Tao ◽  
Jianglin Ye ◽  
...  
Keyword(s):  
High Sensitivity ◽  
Strain Sensors ◽  
3D Graphene ◽  
Graphene Films

scholarly journals Giant gauge factor of Van der Waals material based strain sensors

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Wenjie Yan ◽  
Huei-Ru Fuh ◽  
Yanhui Lv ◽  
Ke-Qiu Chen ◽  
Tsung-Yin Tsai ◽  
...  
Keyword(s):  
Carrier Mobility ◽  
Large Range ◽  
Van Der Waals ◽  
High Sensitivity ◽  
Strain Sensors ◽  
Strain Gauges ◽  
Gauge Factor ◽  
Proof Of Concept ◽  
High Flexibility ◽  
Small Deformations

AbstractThere is an emergent demand for high-flexibility, high-sensitivity and low-power strain gauges capable of sensing small deformations and vibrations in extreme conditions. Enhancing the gauge factor remains one of the greatest challenges for strain sensors. This is typically limited to below 300 and set when the sensor is fabricated. We report a strategy to tune and enhance the gauge factor of strain sensors based on Van der Waals materials by tuning the carrier mobility and concentration through an interplay of piezoelectric and photoelectric effects. For a SnS2 sensor we report a gauge factor up to 3933, and the ability to tune it over a large range, from 23 to 3933. Results from SnS2, GaSe, GeSe, monolayer WSe2, and monolayer MoSe2 sensors suggest that this is a universal phenomenon for Van der Waals semiconductors. We also provide proof of concept demonstrations by detecting vibrations caused by sound and capturing body movements.

Area-Arrayed Graphene Nano-Ribbon-Base Strain Sensor

2018 ◽  
Author(s):  
Ryohei Nakagawa ◽  
Zhi Wang ◽  
Ken Suzuki
Keyword(s):  
Chemical Vapor Deposition ◽  
Stress Concentration ◽  
Health Monitoring ◽  
Vapor Deposition ◽  
Strain Sensor ◽  
Chemical Vapor ◽  
High Sensitivity ◽  
Strain Sensors ◽  
Chemical Vapor Deposition Method ◽  
High Quality

Health monitoring devices using a strain sensor, which shows high sensitivity and large deformability, are strongly demanded due to further aging of society with fewer children. Conventional strain sensors, such as metallic strain gauges and semiconductive strain sensors, however, aren’t applicable to health monitoring because of their low sensitivity and deformability. In this study, fundamental design of area-arrayed graphene nano-ribbon (GNR) strain senor was proposed in order to fabricate next-generation strain sensor. The sensor was consisted of two sections, which are stress concentration section and stress detecting section. This structure can take full advantage of GNR’s properties. Moreover, high quality GNR fabrication process, which is one of the important process in the sensor, was developed by applying CVD (Chemical Vapor Deposition) method. Top-down approach was applied to fabricate the GNR. At first, in order to synthesize a high-quality graphene sheet, acetylene-based LPCVD (low pressure chemical vapor deposition) using a closed Cu foil was employed. After that, graphene was transferred silicon substrate and the quality was evaluated. The high quality graphene was transferred on the soft PDMS substrate and metallic electrodes were fabricated by applying MEMS technology. Area-arrayed fine pin structure was fabricated by using hard PDMS as a stress-concentration section. Finally, both sections were integrated to form a highly sensitive and large deformable pressure sensor. The strain sensitivity of the GNR-base sensor was also evaluated.

scholarly journals Ultralight, Ultraflexible, Anisotropic, Highly Thermally Conductive Graphene Aerogel Films

Molecules ◽  
2021 ◽  
Vol 26 (22) ◽  
pp. 6867
Author(s):  
Zheng Liu ◽  
Qinsheng Wang ◽  
Linlin Hou ◽  
Yingjun Liu ◽  
Zheng Li
Keyword(s):  
Thermal Conductivity ◽  
Expansion Method ◽  
Graphene Aerogel ◽  
3D Graphene ◽  
Graphene Layers ◽  
Thermal Insulating ◽  
Graphene Films ◽  
High Anisotropy ◽  
Thermally Conductive ◽  
Aerogel Films

Graphene aerogels have attracted much attention as a promising material for various applications. The unusually high intrinsic thermal conductivity of individual graphene sheets makes an obvious contrast with the thermal insulating performance of assembled 3D graphene materials. We report the preparation of anisotropy 3D graphene aerogel films (GAFs) made from tightly packed graphene films using a thermal expansion method. GAFs with different thicknesses and an ultimate low density of 4.19 mg cm−3 were obtained. GAFs show high anisotropy on average cross-plane thermal conductivity (K⊥) and average in-plane thermal conductivity (K||). Additionally, uniaxially compressed GAFs performed a large elongation of 11.76% due to the Z-shape folding of graphene layers. Our results reveal the ultralight, ultraflexible, highly thermally conductive, anisotropy GAFs, as well as the fundamental evolution of macroscopic assembled graphene materials at elevated temperature.

Flexible TPU strain sensors with tunable sensitivity and stretchability by coupling AgNWs with rGO

2020 ◽  
Vol 8 (12) ◽  
pp. 4040-4048 ◽  
Author(s):  
Yan Li ◽  
Shan Wang ◽  
Zhi-chao Xiao ◽  
Yi Yang ◽  
Bo-wen Deng ◽  
...  
Keyword(s):  
Synergistic Effect ◽  
Layer Structure ◽  
High Sensitivity ◽  
Strain Sensors ◽  
Layer By Layer

The layer-by-layer structure formed by the synergistic effect of GO and AgNWs endows the strain sensors with high sensitivity and a wide working range.

Ti3C2Tx MXene-graphene composite films for wearable strain sensors featured with high sensitivity and large range of linear response

Nano Energy ◽  
2019 ◽  
Vol 66 ◽  
pp. 104134 ◽  
Author(s):  
Yina Yang ◽  
Zherui Cao ◽  
Peng He ◽  
Liangjing Shi ◽  
Guqiao Ding ◽  
...  
Keyword(s):  
Linear Response ◽  
Large Range ◽  
Composite Films ◽  
High Sensitivity ◽  
Strain Sensors ◽  
Graphene Composite

An efficient PEDOT-coated textile for wearable thermoelectric generators and strain sensors

2019 ◽  
Vol 7 (12) ◽  
pp. 3496-3502 ◽  
Author(s):  
Yanhua Jia ◽  
Lanlan Shen ◽  
Jing Liu ◽  
Weiqiang Zhou ◽  
Yukou Du ◽  
...  
Keyword(s):  
High Sensitivity ◽  
Strain Sensors ◽  
Thermoelectric Generators ◽  
Electronic Textiles ◽  
Water Durability

Highly flexible PEDOT-based electronic textiles were successfully fabricated for wearable thermoelectric generators and strain sensors with high sensitivity and superior water durability.

scholarly journals Controllable Fabrication of Percolative Metal Nanoparticle Arrays Applied for Quantum Conductance-Based Strain Sensors

Materials ◽  
2020 ◽  
Vol 13 (21) ◽  
pp. 4838
Author(s):  
Zhengyang Du ◽  
Ji’an Chen ◽  
Chang Liu ◽  
Chen Jin ◽  
Min Han
Keyword(s):  
Electron Tunneling ◽  
Electrical Conductance ◽  
High Sensitivity ◽  
Strain Sensors ◽  
Metal Nanoparticle ◽  
Gauge Factor ◽  
Electron Conduction ◽  
Percolation Clusters ◽  
Interdigital Electrodes ◽  
Controllable Fabrication

We use gas phase deposition of well-defined nanoparticles (NPs) to fabricate closely-spaced Pd NP arrays on flexible membranes prepatterned with interdigital electrodes (IDEs). The evolution of the morphology and electron conductance of the NP arrays during deposition is analyzed. The growth of two-dimensional percolation clusters of interconnected NPs, which correlate with the percolation pathway for electron conduction in the NP deposits, is demonstrated. The percolative nature of the NP arrays permits us to finely control the percolation geometries and conductance of the NP film by controlling the NP deposition time so as to realize a precise and reproducible fabrication of sensing materials. Electron transport measurements reveal that the electrical conductance of the NP films is dominated by electron tunneling or hopping across the NP percolating networks. Based on the percolative and quantum tunneling nature, the closely-spaced Pd NP films on PET membranes are used as flexible strain sensors. The sensor demonstrates an excellent response ability to distinguish tiny deformations down to 5×10−4 strain and a high sensitivity with a large gauge factor of 200 up to 4% applied strain.

scholarly journals Combining High Sensitivity and Dynamic Range: Wearable Thin-Film Composite Strain Sensors of Graphene, Ultrathin Palladium, and PEDOT:PSS

2019 ◽  
Vol 2 (4) ◽  
pp. 2222-2229 ◽  
Author(s):  
Julian Ramírez ◽  
Daniel Rodriquez ◽  
Armando D. Urbina ◽  
Anne M. Cardenas ◽  
Darren J. Lipomi
Keyword(s):  
Thin Film ◽  
Dynamic Range ◽  
High Sensitivity ◽  
Strain Sensors ◽  
Film Composite ◽  
Thin Film Composite ◽  
Composite Strain

Naturally Derived Wearable Strain Sensors with Enhanced Mechanical Properties and High Sensitivity

2020 ◽  
Vol 12 (19) ◽  
pp. 22163-22169 ◽  
Author(s):  
Zhen Lv ◽  
Jize Liu ◽  
Xin Yang ◽  
Dongyang Fan ◽  
Jie Cao ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
High Sensitivity ◽  
Strain Sensors
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