A Stretchable Capacitive Strain Sensor Having Adjustable Elastic Modulus Capability for Wide‐Range Force Detection

A nanocrystalline Co-Cr-Ni-Fe compositional complex alloy (CCA) film with a thickness of about 1 micron was produced by a multiple-beam-sputtering physical vapor deposition (PVD) technique. The main advantage of this novel method is that it does not require alloy targets, but rather uses commercially pure metal sources. Another benefit of the application of this technique is that it produces compositional gradient samples on a disk surface with a wide range of elemental concentrations, enabling combinatorial analysis of CCA films. In this study, the variation of the phase composition, the microstructure (crystallite size and defect density), and the mechanical performance (hardness and elastic modulus) as a function of the chemical composition was studied in a combinatorial Co-Cr-Ni-Fe thin film sample that was produced on a surface of a disk with a diameter of about 10 cm. The spatial variation of the crystallite size and the density of lattice defects (e.g., dislocations and twin faults) were investigated by X-ray diffraction line profile analysis performed on the patterns taken by synchrotron radiation. The hardness and the elastic modulus were measured by the nanoindentation technique. It was found that a single-phase face-centered cubic (fcc) structure was formed for a wide range of chemical compositions. The microstructure was nanocrystalline with a crystallite size of 10–27 nm and contained a high lattice defect density. The hardness and the elastic modulus values measured for very different compositions were in the ranges of 8.4–11.8 and 182–239 GPa, respectively.

Download Full-text

A Highly Stable and Durable Capacitive Strain Sensor Based on Dynamically Super‐Tough Hydro/Organo‐Gels

Advanced Functional Materials ◽

10.1002/adfm.202010830 ◽

2021 ◽

pp. 2010830

Author(s):

Funian Mo ◽

Yan Huang ◽

Qing Li ◽

Zifeng Wang ◽

Ruijuan Jiang ◽

...

Keyword(s):

Strain Sensor ◽

Capacitive Strain

Download Full-text

Influence of Alumina Nanofibers Sintered by the Spark Plasma Method on Nickel Mechanical Properties

Metals ◽

10.3390/met11040548 ◽

2021 ◽

Vol 11 (4) ◽

pp. 548 ◽

Cited By ~ 1

Author(s):

Leonid Agureev ◽

Valeriy Kostikov ◽

Zhanna Eremeeva ◽

Svetlana Savushkina ◽

Boris Ivanov ◽

...

Keyword(s):

Mechanical Properties ◽

Tensile Strength ◽

Elastic Modulus ◽

Strength Properties ◽

Alumina Nanoparticles ◽

Metal Powders ◽

Wide Range ◽

The Matrix ◽

Spark Plasma ◽

Average Size

The article presents the study of alumina nanoparticles’ (nanofibers) concentration effect on the strength properties of pure nickel. The samples were obtained by spark plasma sintering of previously mechanically activated metal powders. The dependence of the grain size and the relative density of compacts on the number of nanofibers was investigated. It was found that with an increase in the concentration of nanofibers, the average size of the matrix particles decreased. The effects of the nanoparticle concentration (0.01–0.1 wt.%) on the elastic modulus and tensile strength were determined for materials at 25 °C, 400 °C, and 750 °C. It was shown that with an increase in the concentration of nanofibers, a 10–40% increase in the elastic modulus and ultimate tensile strength occurred. A comparison of the mechanical properties of nickel in a wide range of temperatures, obtained in this work with materials made by various technologies, is carried out. A description of nanofibers’ mechanisms of influence on the structure and mechanical properties of nickel is given. The possible impact of impurity phases on the properties of nickel is estimated. The tendency of changes in the mechanical properties of nickel, depending on the concentration of nanofibers, is shown.

Download Full-text

Package-induced temperature dependence of MEMS capacitive strain sensor and system design considerations

2012 IEEE 25th International Conference on Micro Electro Mechanical Systems (MEMS) ◽

10.1109/memsys.2012.6170242 ◽

2012 ◽

Author(s):

Darrin J. Young ◽

Michael A. Suster ◽

Wen H. Ko

Keyword(s):

Temperature Dependence ◽

System Design ◽

Strain Sensor ◽

Design Considerations ◽

Capacitive Strain

Download Full-text

Active Temperature compensation for MEMS capacitive sensor

10.36227/techrxiv.14379917.v2 ◽

2021 ◽

Author(s):

Cuong Do ◽

Ashwin A. Seshia

Keyword(s):

Energy Harvesting ◽

Low Power ◽

Temperature Variation ◽

Temperature Compensation ◽

Strain Sensor ◽

Capacitive Sensor ◽

Structure Design ◽

Mems Sensors ◽

Capacitive Strain ◽

Active Temperature

Temperature variation is one of the most crucial factors that need to be cancelled in MEMS sensors. Many traditional methodologies require an additional circuit to compensate for temperature. This work describes a new active temperature compensation method for MEMS capacitive strain sensor without any additional circuit. The proposed method is based on a complement 2-D capacitive structure design. It consumes zero-power, which is essential toward the realization of a low-power temperature-compensated sensor in battery-powered or energy-harvesting applications<br>

Download Full-text

A Sawtooth MEMS Capacitive Strain Sensor for Passive Telemetry in Bearings

IEEE Sensors Journal ◽

10.1109/jsen.2021.3107441 ◽

2021 ◽

pp. 1-1

Author(s):

Chi Zhang ◽

Shang-Yang Zhang ◽

Li-Feng Wang

Keyword(s):

Strain Sensor ◽

Capacitive Strain

Download Full-text

Polydiacetylene hydrogel self-healing capacitive strain sensor

Journal of Materials Chemistry C ◽

10.1039/d0tc00576b ◽

2020 ◽

Vol 8 (18) ◽

pp. 6034-6041 ◽

Cited By ~ 5

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.

Download Full-text

Consistent red luminescence in π-conjugated polymers with tuneable elastic moduli over five orders of magnitude

Materials Horizons ◽

10.1039/d0mh00029a ◽

2020 ◽

Vol 7 (5) ◽

pp. 1421-1426 ◽

Cited By ~ 2

Author(s):

Zhenfeng Guo ◽

Akira Shinohara ◽

Chengjun Pan ◽

Florian J. Stadler ◽

Zhonghua Liu ◽

...

Keyword(s):

Elastic Modulus ◽

Conjugated Polymers ◽

Elastic Moduli ◽

Luminescent Properties ◽

Side Chains ◽

Wide Range ◽

Alkyl Side Chains ◽

Red Luminescence

Bulky but flexible alkyl side chains enable π-conjugated polymers to possess wide-range elastic modulus tuneability, yet consistent red luminescent properties.

Download Full-text