Stabilized Pd-alloy/AlN/Si Hydrogen Sensors

2005 ◽  
Vol 872 ◽  
Author(s):  
Linfeng Zhang ◽  
Ibrahim Al-Homoudi ◽  
Md H. Rahman ◽  
Erik F. McCullen ◽  
Lajos Rimai ◽  
...  
Keyword(s):  
Metal Hydride ◽  
Dynamic Range ◽  
Hydrogen Sensor ◽  
Hydrogen Sensors ◽  
Metal Insulator ◽  
Turn On ◽  
Insulator Interface ◽  
Ni Alloy ◽  
Pd Alloy ◽  
Effect Of Oxygen

AbstractIn order to extend the dynamic range of a hydrogen sensor with a metal-insulator-semiconductor (MIS) type structure, Pd-Cr and Pd-Ni alloy gated samples were studied. The PdCr gated sample shows quite stable and reproducible response, and could measure hydrogen concentrations from 100 to 50, 000 ppm. While the Pd-Ni gated sample shows turn-on/off response drift, this drift is probably due to the presence of oxygen on the surface of the insulator and the formation of metal hydride. Furthermore, the effect of oxygen on the sensors response was investigated; oxygen may deplete protons from the metal/insulator interface and could reduce the sensor's response.

Model-Based Analysis of Reflection-Mode Fiber Hydrogen Sensor

2013 ◽  
Vol 433-435 ◽  
pp. 207-210
Author(s):  
Ming Yao Liu ◽  
Yi Liu
Keyword(s):  
Hydrogen Sensor ◽  
Simulation Method ◽  
Good Effect ◽  
Film Material ◽  
Hydrogen Sensors ◽  
Reflection Mode ◽  
Model Based ◽  
Pd Alloy ◽  
Film Substrate ◽  
Model Based Analysis

Researchers have successfully prepared reflection-mode hydrogen sensor by coating Palladium (Pd) alloy in the end of the fiber and it has been proved to be in good effect. Characteristics of the hydrogen sensors are influenced by several factors, such as thickness of thin film, substrate, light wavelength and the film material, etc. For best performance, an optical model of reflection-mode fiber hydrogen sensor is established. The effecting law of each factor is analyzed and discussed through model-based simulation method. The results can provide credible design methods for the reflection-mode fiber hydrogen sensor.

Experimental Studies of New GaAs Metal/Insulator/p-n+Switches Using Low Temperature Oxide

2002 ◽  
Vol 25 (3) ◽  
pp. 233-237
Author(s):  
K. F. Yarn
Keyword(s):  
Low Temperature ◽  
Negative Differential Resistance ◽  
Doping Concentration ◽  
Experimental Studies ◽  
Differential Resistance ◽  
Switching Behavior ◽  
Metal Insulator ◽  
Turn On ◽  
Temperature Oxide ◽  
Phase Chemical

First observation of switching behavior is reported in GaAs metal-insulator-p-n+structure, where the thin insulator is grown at low temperature by a liquid phase chemical-enhanced oxide (LPECO) with a thickness of 100 Å. A significant S-shaped negative differential resistance (NDR) is shown to occur that originates from the regenerative feedback in a tunnel metal/insulator/semiconductor (MIS) interface andp-n+junction. The influence of epitaxial doping concentration on the switching and holding voltages is investigated. The switching voltages are found to be decreased when increasing the epitaxial doping concentration, while the holding voltages are almost kept constant. A high turn-off/turn-on resistance ratio up to105has been obtained.

Research on the Type of Electrical Contact at Metal-Insulator Interface

2011 ◽  
Vol 383-390 ◽  
pp. 5154-5157
Author(s):  
Qian Peng ◽  
Li Ren Zhou
Keyword(s):  
Electrical Contact ◽  
Depletion Region ◽  
Energy Band Structure ◽  
Metal Insulator ◽  
Band Bending ◽  
Whole Process ◽  
Insulator Interface ◽  
Metal Insulator Metal ◽  
Electrode Metal ◽  
Nor Band

This paper takes metal-insulator-metal system as example and investigates the main types of electrical contact through the view of energy band structure, to analyze the whole process of the transition from ohm contact to barrier contact. Ohm contact, which promotes charges injection from electrode (metal) to insulator, can be used as storage of charge carrier, which is body limited; it can also be regarded as a type of contact that forms an accumulation layer extending from the interface to the interior of the insulator. Whereas, barrier contact is a type of contact which forms a depletion region extending from the interface to the interior of insulator. As for this type of contact, electron injection from metal tends to the state of saturation. The characteristic of neutral contact is that there is no space charge in the insulator, nor band bending, which means the boundary of conduction band and valence band up to the interface is flat.

scholarly journals Investigations of Different Ion Intercalations on the Performance of FBG Hydrogen Sensors Based on Pt/MoO3

Sensors ◽  
2019 ◽  
Vol 19 (21) ◽  
pp. 4775 ◽  
Author(s):  
Gaopeng Wang ◽  
Shiwen Yang ◽  
Jixiang Dai ◽  
Yutang Dai ◽  
Tong Zou ◽  
...  
Keyword(s):  
Layer Structure ◽  
Hydrogen Sensor ◽  
Hydrogen Sensors ◽  
Practical Application ◽  
Crystalline Layer ◽  
Optimal Amount ◽  
Hydrogen Sensing ◽  
Sensing Material ◽  
Ionic Bonds ◽  
Ion Species

α-MoO3 has been used as a hydrogen sensing material due to its excellent properties and unique crystalline layer structure. However, the low repeatability of α-MoO3 based hydrogen sensor restricts its practical application. In this paper, the effect of intercalated ion species and the amount in α-MoO3 is experimentally investigated and discussed. It is concluded that the repeatability of the sensor depends on the radius of intercalated ions and amount of ionic bonds. The optimal ion species is Na+ and the optimal amount of precursor is 1 mmol.

Improving the Performance of Hydrogen Sensors with Novel TiO2 Nanotube Arrays Hybrid Structure

2019 ◽  
Vol 803 ◽  
pp. 120-123
Author(s):  
Xiong Bang Wei ◽  
Guo Dong Lv ◽  
Xiao Hui Yang ◽  
Tao Wu ◽  
Dong Shi ◽  
...  
Keyword(s):  
Room Temperature ◽  
Research Work ◽  
High Sensitivity ◽  
Hydrogen Sensor ◽  
Hybrid Structure ◽  
Nanotube Arrays ◽  
Hybrid Nanostructure ◽  
Hydrogen Sensors ◽  
Novel Structure ◽  
Titanium Wire

In this paper, a kind of novel TiO2 nanotube arrays (TNTs) hybrid structure was presented to improve the performance of hydrogen sensors. In this novel structure, palladium functionalized TNTs hybrid nanostructure supported on titanium wire. TNTs arrays was prepared by anodizing Ti wire using a standard electrochemical procedure. Pd nanomaterials were deposited on TNTs. Optimized experiments showed the hydrogen sensor supported on titanium wire showed a good response time of 8 s and high sensitivity of 94.8% at 1.9 vol% H2 at room temperature (25 °C). The research work revealed potential good hydrogen sensitivity of this kind of hybrid nanostructure.

A novel Pd/oxide/GaAs metal-insulator-semiconductor field-effect transistor (MISFET) hydrogen sensor

2001 ◽  
Vol 16 (12) ◽  
pp. 997-1001 ◽  
Author(s):  
Kun-Wei Lin ◽  
Chin-Chuan Cheng ◽  
Shiou-Ying Cheng ◽  
Kuo-Hui Yu ◽  
Chih-Kai Wang ◽  
...  
Keyword(s):  
Field Effect ◽  
Field Effect Transistor ◽  
Hydrogen Sensor ◽  
Metal Insulator ◽  
Metal Insulator Semiconductor ◽  
Effect Transistor

Metal hydride switchable mirrors: Factors influencing dynamic range and stability

2006 ◽  
Vol 90 (4) ◽  
pp. 485-490 ◽  
Author(s):  
Jonathan L. Slack ◽  
James C.W. Locke ◽  
Seung-Wan Song ◽  
Jason Ona ◽  
Thomas J. Richardson
Keyword(s):  
Metal Hydride ◽  
Dynamic Range ◽  
Factors Influencing

Wearable colorimetric sensing fiber based on polyacrylonitrile with PdO@ZnO hybrids for the application of detecting H2 leakage

2020 ◽  
Vol 90 (19-20) ◽  
pp. 2198-2211
Author(s):  
Sung-Ho Hwang ◽  
Young Kwang Kim ◽  
Soon Moon Jeong ◽  
Changsoon Choi ◽  
Ka Young Son ◽  
...  
Keyword(s):  
Color Change ◽  
Hydrogen Sensor ◽  
Hydrogen Gas ◽  
Hybrid Nanoparticles ◽  
Hydrogen Sensors ◽  
Colorimetric Sensing ◽  
Hydrogen Sensing ◽  
Detection Systems ◽  
Sensing Material ◽  
Novel Method

A colorimetric hydrogen sensor has great potential for accurately detecting and monitoring the leakage of hydrogen gas on account of its fast color change in contact with hydrogen gas. However, for the practical application of the sensor, such as in gas detection systems in clothing, the flexibility and stability of the sensor need to be improved. Here, we present a novel method to fabricate a flexible colorimetric hydrogen sensor with the stable embedment of sensing material. To improve the flexibility and stability of the sensor, polyacrylonitrile nanofiber containing palladium oxide and zinc oxide hybrid nanoparticles was prepared by electrospinning. The flexible colorimetric hydrogen sensor can detect 1000 ppm hydrogen gas with excellent selectivity within 2 min. We also suggest film and yarn-type flexible colorimetric hydrogen sensors for industrial and wearable applications. A laminating process was used to prepare the film. In contrast, twisting and polydimethylsiloxane coating were used to prepare the yarn-type flexible colorimetric hydrogen sensor. Compared with a flexible colorimetric hydrogen-sensing nanofiber, the film and yarn show identical sensitivity for detecting a hydrogen leakage. These applications of hydrogen sensors could be a new insight into the design of a flexible sensor for detecting hydrogen leakage with the naked eye.

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