Electrical Resistance Change with Crystallization in Si-Te Amorphous Thin Films

2010 ◽  
Vol 1251 ◽  
Author(s):  
Yuta Saito ◽  
Yuji Sutou ◽  
Junichi Koike
Keyword(s):  
Crystallization Temperature ◽  
Electrical Resistance ◽  
High Resistivity ◽  
Resistance Change ◽  
Amorphous Thin Films ◽  
Resistance Increase ◽  
Stage Crystallization ◽  
Amorphous Si ◽  
Si Content ◽  
Electrical Resistance Change

AbstractThe electrical resistance change of amorphous SixTe100-x (x: 10-23) films during heating was investigated by a two-point probe method. The SixTe100-x films showed two-stage crystallization processes. The film was firstly crystallized to Te and subsequently crystallized to Si2Te3 with an electrical resistance drop. The first crystallization temperature Tx1st slightly increased with increasing Si content, while the second crystallization temperature Tx2nd was independent on the composition and was a constant temperature of 310 °C. In all films, the electrical resistance once increased in the temperature range from 250 to 295 °C before the crystallization of the Si2Te3. This temporal resistance increase could be explained by considering a formation of high-resistivity Si-rich amorphous phase.

Matrix Crack Detection of CFRP Laminates in Cryogenic Temperature Using Electrical Resistance Change Method

2006 ◽  
Vol 321-323 ◽  
pp. 873-876 ◽  
Author(s):  
Akira Todoroki ◽  
Kazuomi Omagari ◽  
Masahito Ueda
Keyword(s):  
Electrical Resistance ◽  
Cryogenic Temperature ◽  
Matrix Crack ◽  
Fuel Tank ◽  
Matrix Cracking ◽  
Resistance Change ◽  
Cfrp Laminates ◽  
Resistance Increase ◽  
Matrix Cracks ◽  
Electrical Resistance Change

For a cryogenic fuel tank of a next generation rocket, a Carbon Fiber Reinforced Plastic (CFRP) laminated composite tank is one of the key technologies. For the fuel tank made from the laminated composites, matrix cracks are significant problems that cause leak of the fuel. In the present paper, electrical resistance change method is adopted to monitor the matrix cracking of the CFRP laminate. Previous studies show that tension load in fiber direction causes electrical resistance increase due to the piezoresistivity of the carbon fibers, and fiber breakages also cause the electrical resistance increase of the CFRP laminates. In order to distinguish the electrical resistance changes due to matrix cracking from those due to the piezoresistivity and the fiber breakages, residual electrical resistance change under the complete unloading condition is employed in the present study. Experimental investigations were performed using cross-ply laminates in cryogenic temperature. As a result, it can be revealed that the residual electrical resistance change is a useful indicator for matrix crack monitoring of the cross-ply CFRP laminates.

Electrical Failure and Damage Analysis of Multi-Layer Metal Films on Flexible Substrate during Cyclic Bending Deformation

2011 ◽  
Author(s):  
Byoung-Joon Kim ◽  
Hae-A-Seul Shin ◽  
In-Suk Choi ◽  
Young-Chang Joo
Keyword(s):  
Fatigue Resistance ◽  
Electrical Resistance ◽  
Metal Film ◽  
Flexible Substrate ◽  
Resistance Change ◽  
Cyclic Bending ◽  
Capping Layer ◽  
Bending Strain ◽  
Cu Film ◽  
Electrical Resistance Change

Abstract The electrical resistance Cu film on flexible substrate was investigated in cyclic bending deformation. The electrical resistance of 1 µm thick Cu film on flexible substrate increased up to 120 % after 500,000 cycles in 1.1 % tensile bending strain. Crack and extrusion were observed due to the fatigue damage of metal film. Low bending strain did not cause any damage on metal film but higher bending strain resulted in severe electrical and mechanical damage. Thinner film showed higher fatigue resistance because of the better mechanical property of thin film. Cu film with NiCr under-layer showed poorer fatigue resistance in tensile bending mode. Ni capping layer did not improve the fatigue resistance of Cu film, but Al capping layer suppressed crack formation and lowered electrical resistance change. The NiCr under layer, Ni capping layer, and Al capping layer effect on electrical resistance change of Cu film was compared with Cu only sample.

A highly-deformable piezoresistive film composed of a network of carbon blacks and highly oriented lamellae of high-density polyethylene

RSC Advances ◽  
2015 ◽  
Vol 5 (39) ◽  
pp. 31074-31080 ◽  
Author(s):  
Shaodi Zheng ◽  
Jie Deng ◽  
Luqiong Yang ◽  
Danqi Ren ◽  
Wei Yang ◽  
...  
Keyword(s):  
Electrical Resistance ◽  
High Density Polyethylene ◽  
High Density ◽  
Resistance Change ◽  
Carbon Blacks ◽  
Electrical Resistance Change

The electrical resistance change of highly extensible films consisting of a network of carbon blacks in high-density polyethylene, with different regularity of stacked lamellae, is investigated.

Signal conditioning circuit for gel strain sensors

2021 ◽  
Author(s):  
Ismael Payo ◽  
J. L. Polo ◽  
Blanca Lopez ◽  
Diana Serrano ◽  
Antonio M. Rodríguez ◽  
...  
Keyword(s):  
Electrical Resistance ◽  
Pressure Sensors ◽  
Strain Sensors ◽  
Resistance Force ◽  
Electrode Impedance ◽  
Signal Conditioning ◽  
Resistance Change ◽  
Signal Conditioning Circuit ◽  
Conditioning Circuit ◽  
Electrical Resistance Change

Abstract Conductive Hydrogels are soft materials which have been used by some researchers as resistive strain sensors in the last years. The electrical resistance change, when the sensor is stretched or compressed, is usually measured by the two-electrode method. This method is not always suitable to measure the electrical resistance of polymers-based materials, like hydrogels, because it could be highly influenced by the electrode/sample interface, as explained in this study. For this reason, a signal conditioning circuit, based on four-electrode impedance measurements, is proposed to measure the electrical resistance change when the gel is stretched or compressed. Experimental results show that the tested gels can be used as resistance force/pressure sensors with a quite linear behaviour.

Annealing induced interdiffusion and crystallization in sputtered amorphous Si/Ge multilayers

1997 ◽  
Vol 12 (9) ◽  
pp. 2255-2261 ◽  
Author(s):  
Zs. Czigány ◽  
G. Radnóczi ◽  
K. Järrendahl ◽  
J-E. Sundgren
Keyword(s):  
Crystallization Temperature ◽  
Diffusion Constant ◽  
Amorphous State ◽  
Diffraction Measurement ◽  
Individual Layer ◽  
Cross Sectional ◽  
Short Period ◽  
Amorphous Si ◽  
Si Content ◽  
20 Nm

The intermixing and crystallization of amorphous Si/Ge multilayers (with individual layer thickness between 1.5 and 20 nm) and SiGe alloys produced by dc magnetron sputtering have been studied by cross-sectional transmission electron microscopy and x-ray diffraction. Measurement of the crystallization temperature as a function of the Si content showed that multilayers and alloys with equal composition crystallized at the same temperature. This implies that intermixing precedes crystallization in the multilayers. Close to the crystallization temperature, formation of Kirkendall voids was observed in the short-period Si/Ge multilayers. These voids were found at positions corresponding to the original Si layers, indicating that Si diffuses faster in amorphous Ge than Ge in amorphous Si. The Ge layers in short-period Si/Ge multilayers retained their amorphous state to much higher temperatures than thick amorphous Ge layers. This is shown to be due to inhibition of nucleation by the presence of the layer interfaces. A lower estimate for the Si diffusion constant in crystalline Ge is also determined.

Assessing the Stability of Inkjet-Printed Carbon Nanotube for Brine Sensing Applications

2020 ◽  
Vol 20 (12) ◽  
pp. 7644-7652
Author(s):  
Khalid Marbou ◽  
Waqas Gil ◽  
Amal Al Ghaferi ◽  
Irfan Saadat ◽  
Khalid Alhammadi ◽  
...  
Keyword(s):  
Electrical Resistance ◽  
Electrochemical Sensors ◽  
Sessile Drop ◽  
Synthesis Methods ◽  
Resistance Change ◽  
Sensing Applications ◽  
The Stability ◽  
The Impact ◽  
Oil Gas ◽  
Electrical Resistance Change

In hostile environments, sensing is critical for many industries such as chemical and oil/gas. Within this industry, the deposition of scales or minerals on various infrastructure components (e.g., pipelines) forms a reliability hazard that needs to be monitored. Therefore, the approach adopted in this study to tackle this issue relies on the use of real-time sensing of specific ions in brine, the natural trigger for ions deposition. In order to do so, electrochemical sensors based on carbon nanotubes (CNTs) are developed, taking advantage of their unique properties facilitated by different synthesis and fabrication methods. One of these promising synthesis methods is inkjet printing of CNT films since in general, it has exceptional benefits over other approaches that are used to print CNTs. Furthermore, it does not need the use templates. In addition, it is a very fast technique with consistent printing results for many applications along with very low cost on various shapes/formfactors. As these sensors are exposed to a hostile environment (chemical, temperature, etc.), the stability of the CNT films is of great importance. In this study, a comprehensive investigation of the stability of CNT surfaces upon exposure to elements is presented. Accordingly, the several impacts of this interaction on physical properties of the surfaces as a function of interaction time and brine chemical composition are assessed. Moreover, the approach used for investigating the impact of this exposure involves the following: surface electrical resistance change using four probe measurements; surface roughness/topography using Atomic Force Microscopy (AFM) along Scanning Electron Microscopy (SEM); quality of CNT through Raman spectroscopy and wettability using the sessile drop method. The sensing capabilities of the devices are investigated by looking at the sensing selectivity of target ions, resetting capabilities, and sensing sensitivity manifested in the electrical resistance change. Consequently, our results indicate that while inkjet films are very promising sensor material, the fabrication and long term stability require further optimization of the films along with the process to make them meet reliability and lifetime requirements in the oil/gas hostile operational environments.

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