758 Fabrication and performance of piezoelectric strain sensors made from PVDF/MWNT nanocomposites

Flexible strain sensors are fundamental devices for application in human body monitoring in areas ranging from health care to soft robotics. Stretchable piezoelectric strain sensors received an ever-increasing interest to design novel, robust and low-cost sensing units for these sensors, with intrinsically conductive polymers (ICPs) as leading materials. We investigated a sensitive element based on crosslinked electrospun nanofibers (NFs) directly collected and thermal treated on a flexible and biocompatible substrate of polydimethylsiloxane (PDMS). The nanostructured active layer based on a blend of poly(ethylene oxide) (PEO) and poly(3,4-ethylenedioxythiophene) doped with poly(styrene sulfonate) (PEDOT:PSS) as the ICP was optimized, especially in terms of the thermal treatment that promotes electrical conductivity through crosslinking of PEO and PSS, preserving the nanostructuration and optimizing the coupling between the sensitive layer and the substrate. We demonstrate that excellent properties can be obtained thanks to the nanostructured active materials. We analyzed the piezoresistive response of the sensor in both compression and traction modes, obtaining an increase in the electrical resistance up to 90%. The Gauge Factors (GFs) reflected the extraordinary piezoresistive behavior observed: 45.84 in traction and 208.55 in compression mode, which is much higher than the results presented in the literature for non-nanostructurated PEDOT.

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J044115 Fabrication and performance evaluation of strain sensors made from PVDF/MWNT nanocomposites

The Proceedings of Mechanical Engineering Congress Japan ◽

10.1299/jsmemecj.2012._j044115-1 ◽

2012 ◽

Vol 2012 (0) ◽

pp. _J044115-1-_J044115-4

Author(s):

Keisuke TANABE ◽

Ning HU

Keyword(s):

Performance Evaluation ◽

Strain Sensors ◽

And Performance

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On the comparison between displacement modal testing and strain modal testing

Proceedings of the Institution of Mechanical Engineers Part C Journal of Mechanical Engineering Science ◽

10.1177/0954406215614599 ◽

2016 ◽

Vol 230 (19) ◽

pp. 3389-3396 ◽

Cited By ~ 4

Author(s):

Emiliano Mucchi

Keyword(s):

High Frequency ◽

Strain Sensor ◽

Calibration Procedure ◽

Strain Sensors ◽

Modal Testing ◽

Strain Gauges ◽

Bonding Quality ◽

Pros And Cons ◽

Piezoelectric Strain ◽

Excitation Force

The conventional modal testing (referred to as displacement modal testing (DMT)) is based on measurement of displacement, velocity or acceleration as well as excitation force. Though there exits an enormous literature with regard to DMT, on the contrary, a few papers address modal testing based on strain gauges or strain sensor (referred to as strain modal testing (SMT)). The main reason for this scenario is due to practical problems in the use of strain gauges as calibration procedure, ground loop sensitivity are not adequate at high frequency, bonding quality. In this work, a novel piezoelectric strain sensor is used for SMT. In this study it is demonstrated that this sensor overcomes the practical drawbacks related to the use of strain gauges. Thus, SMT based on piezoelectric strain sensors can be a valid alternative to DMT which is usually based on accelerometers. Comparisons between the modal testing results concerning brackets with different constraint conditions using both accelerometers and strain sensors are given in terms of modal parameters, highlighting their pros and cons.

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Fibre Bragg Grating Based Strain Sensors: Review of Technology and Applications

Sensors ◽

10.3390/s18093115 ◽

2018 ◽

Vol 18 (9) ◽

pp. 3115 ◽

Cited By ~ 76

Author(s):

Carlo Campanella ◽

Antonello Cuccovillo ◽

Clarissa Campanella ◽

Abdulkadir Yurt ◽

Vittorio Passaro

Keyword(s):

Research Field ◽

Strain Sensors ◽

Bragg Grating ◽

Fibre Bragg Grating ◽

Mode Splitting ◽

Key Sectors ◽

Low Costs ◽

And Performance ◽

Physical Principles ◽

Advanced Applications

Fibre Bragg grating (FBG) strain sensors are not only a very well-established research field, but they are also acquiring a bigger market share due to their sensitivity and low costs. In this paper we review FBG strain sensors with high focus on the underlying physical principles, the interrogation, and the read-out techniques. Particular emphasis is given to recent advances in highly-performing, single head FBG, a category FBG strain sensors belong to. Different sensing schemes are described, including FBG strain sensors based on mode splitting. Their operation principle and performance are reported and compared with the conventional architectures. In conclusion, some advanced applications and key sectors the global fibre-optic strain sensors market are envisaged, as well as the main market players acting in this field.

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High-performance Sb-doped p-ZnO NW films for self-powered piezoelectric strain sensors

Nano Energy ◽

10.1016/j.nanoen.2020.104744 ◽

2020 ◽

Vol 73 ◽

pp. 104744 ◽

Cited By ~ 4

Author(s):

Zhihao Huo ◽

Xiandi Wang ◽

Yufei Zhang ◽

Bensong Wan ◽

Wenqiang Wu ◽

...

Keyword(s):

High Performance ◽

Strain Sensors ◽

Piezoelectric Strain ◽

Self Powered

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On the Comparison Between Displacement Modal Testing and Strain Modal Testing

Volume 8: 27th Conference on Mechanical Vibration and Noise ◽

10.1115/detc2015-46347 ◽

2015 ◽

Cited By ~ 1

Author(s):

Emiliano Mucchi ◽

Giorgio Dalpiaz

Keyword(s):

High Frequency ◽

Strain Sensor ◽

Calibration Procedure ◽

Strain Sensors ◽

Modal Testing ◽

Strain Gauges ◽

Bonding Quality ◽

Pros And Cons ◽

Piezoelectric Strain ◽

Excitation Force

The conventional modal testing, hereafter referred as Displacement Modal Testing (DMT) is based on measurement of displacement, velocity or acceleration as well as excitation force. An enormous literature regards the DMT, on the contrary, a few papers address modal testing based on strain gauges or strain sensor, hereafter referred as Strain Modal Testing (SMT). The main reason of this scenario is due to practical problems in the use of strain gauges as calibration procedure, ground loop, sensitivity not adequate at high frequency, bonding quality. In this work, a novel piezoelectric strain sensor is used for SMT. It is demonstrated in the present work that this sensor overcomes the practical drawbacks related to the use of strain gauges. Thus, SMT based on piezoelectric strain sensors can be a valid alternative to DMT, usually based on accelerometers. Comparisons between the modal testing results concerning brackets with different constraint conditions using both accelerometers and strain sensors are given in terms of modal parameters, highlighting their pros and cons.

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ZnO on Si3N4 Bimorphs with Large Deflections

MRS Proceedings ◽

10.1557/proc-242-749 ◽

1992 ◽

Vol 242 ◽

Author(s):

Wai-Shing Choi ◽

Jan G. Smits

Keyword(s):

Electric Field ◽

Strong Electric Field ◽

Strain Sensors ◽

Zno Films ◽

Large Deflections ◽

Cantilever Beams ◽

Tactile Sensors ◽

Quadratic Effect ◽

Piezoelectric Strain ◽

Piezoelectric Bimorphs

ABSTRACTPiezoelectric bimorphs and piezoelectric strain sensors based on sputtered ZnO films were fabricated on Si3N4 cantilever beams to form tactile sensors. The sensors were used to determine object positions. Deflections of the bimorphs showed a quadratic dependence on the applied voltages. Deflection as large as 1166 μm were registered for a bimorph of 2980 μm long. The apparent d33 of ZnO under a bias of -4 volts was - 103 × 1O-12 m/V, which was approximately 20 times larger than the previously reported values of -5.12 × 10-12m/V. The large deflections of the bimorphs were due to the quadratic effect under strong electric field.

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