Hexagon Platinum Schottky Contact with ZnO Thin Film for Hydrogen Sensing

2013 ◽  
Vol 64 (3) ◽  
Author(s):  
Mas Elyza Mohd Azol ◽  
Nafarizal Nayan ◽  
Uda Hashim ◽  
Muhammad Kashif ◽  
Mahnaz Shafiei ◽  
...  
Keyword(s):  
Thin Film ◽  
Electric Field ◽  
Schottky Contact ◽  
Hydrogen Sensor ◽  
Contact Layer ◽  
Hydrogen Gas ◽  
Oxide Thin Film ◽  
M Current ◽  
Hydrogen Sensing ◽  
Sharp Edges

This paper reports on the study of the effect on adding total peripheries and sharp edges to the Schottky contact as a hydrogen sensor. Schottky contact was successfully designed and fabricated as hexagon-shape. The contact was integrated together with zinc oxide thin film and tested towards 1% hydrogen gas. Simulations of the design were conducted using COMSOL Multiphysics to observe the electric field characteristic at the contact layer. The simulation results show higher electric field induced at sharp edges with 4.18×104 V/m. Current-voltage characteristic shows 0.27 V voltage shift at 40 µA biased current.

Hydrogen-Sensor Prepared Using Proton-Conducting Glass Films

2007 ◽  
Vol 124-126 ◽  
pp. 627-630 ◽  
Author(s):  
Midori Matsumura ◽  
Yusuke Daiko ◽  
Masayuki Nogami
Keyword(s):  
Thin Film ◽  
Indium Tin Oxide ◽  
High Speed ◽  
Sol Gel ◽  
Reference Electrode ◽  
Hydrogen Sensor ◽  
Hydrogen Gas ◽  
Oxide Thin Film ◽  
Proton Conducting ◽  
Glass Films

Solid-state potentiometric thin film hydrogen gas sensors were successfully fabricated using a sol-gel-derived high proton-conducting P2O5-SiO2 glass films. Manganese oxide thin film coated on an indium tin oxide (ITO)-coated glass substrate was used for reference electrode. The sensor exhibited high speed responsibility within 10 s and 120 s at 30 oC and -30oC, respectively, for 1 vol.% hydrogen gas. A linear relationship between the electromotive force (EMF) and the logarithmic hydrogen concentration of 0.1~1 vol.% was obtained in the temperature ranging from -30 to 30 oC. The sensing mechanism was also discussed to improve the sensitivity and sensing speed against low H2 concentration at low temperatures.

scholarly journals Hydrogen gas sensors based on electrostatically spray deposited nickel oxide thin film structures

2015 ◽  
Vol 5 (3) ◽  
pp. 235-240 ◽  
Author(s):  
Raied K. Jamal ◽  
Kadhim A. Aadim ◽  
Qahtan G. Al-Zaidi ◽  
Iman N. Taaban
Keyword(s):  
Thin Film ◽  
Nickel Oxide ◽  
Gas Sensors ◽  
Hydrogen Gas ◽  
Oxide Thin Film ◽  
Hydrogen Gas Sensors ◽  
Nickel Oxide Thin Film

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.

scholarly journals Electric Field-aided Selective Activation for Indium-Gallium-Zinc-Oxide Thin Film Transistors

2016 ◽  
Vol 6 (1) ◽  
Author(s):  
Heesoo Lee ◽  
Ki Soo Chang ◽  
Young Jun Tak ◽  
Tae Soo Jung ◽  
Jeong Woo Park ◽  
...  
Keyword(s):  
Thin Film ◽  
Zinc Oxide ◽  
Electric Field ◽  
Thin Film Transistors ◽  
Oxide Thin Film ◽  
Indium Gallium Zinc Oxide ◽  
Zinc Oxide Thin Film ◽  
Selective Activation ◽  
Indium Gallium

High Performance Zinc Oxide Thin Film Transistors Through Improved Material Processing and Device Design

2014 ◽  
Author(s):  
Ahmad Hossein Adl ◽  
Samira Farsinezhad ◽  
Alex Ma ◽  
Douglas W. Barlage ◽  
Karthik Shankar
Keyword(s):  
Thin Film ◽  
Thin Film Transistors ◽  
High Performance ◽  
Schottky Contact ◽  
Depletion Region ◽  
Charge Carriers ◽  
Oxide Thin Film ◽  
Zinc Oxide Thin Film ◽  
Poor Control ◽  
High Throughput Method

Solution processing (SP) is a cheap, simple and high-throughput method for the fabrication of ZnO thin film transistors (TFTs). Lack of enhancement mode operation, poor crystallinity, traps, and poor control of the carrier concentration are some of the disadvantages of this method. The high intrinsic electron concentration of SP-ZnO makes saturation of TFTs non-trivial. We report on Schottky barrier thin film transistors (SB-TFT). By biasing the source Schottky contact in reverse bias, a depletion region is formed around the source contact hence depleting the region from the free charge carriers which produces the saturation of the device. The effect of the Schottky contact is illustrated by comparing the operation of SB-TFTs with that of conventional TFTs.

scholarly journals Palladium thin films for plasmonic hydrogen gas sensing

2019 ◽  
Vol 11 (2) ◽  
pp. 56
Author(s):  
Erwin Maciak
Keyword(s):  
Thin Films ◽  
Surface Plasmon Resonance ◽  
Low Temperature ◽  
Gas Sensor ◽  
Room Temperature ◽  
Fiber Optic ◽  
Hydrogen Sensor ◽  
Hydrogen Gas ◽  
Sensors And Actuators ◽  
Hydrogen Sensing

In this study, I prepared BK7 glass slides coated by palladium (Pd) layer by PVD technique. These samples have been employed as plasmon active structures in classic Kretschmann-based SPR set-up. The application of H2 sensing structures based on palladium plasmonic active thin films have been tested and investigated. Hydrogen sensing properties of Pd films were investigated at room temperature The reflectances of p-polarized light from Pd thin films as a function of angle of incidence and wavelength were measured in synthetic air (or nitrogen) and in gas mixtures including hydrogen. Variations of the reflectance in the presence of hydrogen gas at room temperature revealed that the samples can sense hydrogen in a wide range of concentration (0–2% vol/vol) without saturation behavior. The dynamic properties with various concentration of H2 at low temperature and dry gas mixtures was investigated and the effects of these factors on the hydrogen sensing properties were analyzed. Full Text: PDF ReferencesG. Korotcenkov, Handbook of Gas Sensor Materials: Properties, Advantages, and Shortcomings for Applications (Springer, New York 2013). CrossRef W. Jakubik, M. Urbanczyk, E. Maciak, "SAW hydrogen gas sensor based on WO3 and Pd nanostructures", Procedia Chemistry 1 (1), 200 (2009). CrossRef W. Jakubik, M. Urbanczyk, E. Maciak, T. Pustelny, "Bilayer Structures of NiOx and Pd in Surface Acoustic Wave and Electrical Gas Sensor Systems", Acta Physica Polonica A 116(3), 315 (2009). CrossRef E. Maciak, Z. Opilski, "Pd/V2O5 fiber optic hydrogen gas sensor", J. Phys. France IV 129, 137 (2005). CrossRef E. Maciak,. "Fiber optic sensor for H2 gas detection in the presence of methane based on Pd/WO3 low-coherence interferometric structure", Proc. SPIE 10455, UNSP 104550W (2017). CrossRef X. Bevenot, A. Truillet, C. Veillas, H. Gagnaire, M. Clement, "Hydrogen leak detection using an optical fibre sensor for aerospace applications", Sens. Actuators B 67, 57 (2000). CrossRef J. Homola, S.S. Yee, G. Gauglitz, "Surface plasmon resonance sensors: review", Sensors and Actuators B 54, 3 (1999). CrossRef H. Raether, Surface plasmons on smooth and rough surfaces and on gratings (Springer-Verlag, Berlin-Heidelberg 1988). CrossRef P. Tobiska, O. Hugon, A. Trouillet, H.Gagnarie, "An integrated optic hydrogen sensor based on SPR on palladium", Sensors and Actuators, B 74, 168 (2001). CrossRef Z. Opilski, E. Maciak, "Optical hydrogen sensor employing the phenomenon of the surface plasmons resonance in the palladium layer", Proc. SPIE 5576, 202 (2004). CrossRef T. Pustelny, E. Maciak, Z. Opilski, A. Piotrowska, E. Papis, K. Golaszewska, "Investigation of the ZnO sensing structure on NH3 action by means of the surface plasmon resonance method", European Physical Journal-Special Topics 154, 165 (2008). CrossRef E. Maciak, M. Procek, K. Kępska, A. Stolarczyk, "Study of optical and electrical properties of thin films of the conducting comb-like graft copolymer of polymethylsiloxane with poly(3-hexyltiophene) and poly(ethylene) glycol side chains for low temperature NO2 sensing", Thin Solid Films 618, 277 (2016). CrossRef

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