Highly-sensitive, fast hydrogen sensing employing Pt-coated TiO2 nanotube arrays

Highly ordered TiO 2 nanotube arrays were fabricated by anodization in an ethylene glycol solution containing NH 4 F . A pair of platinum electrodes was deposited on the surface of the nanotube layer to fabricate a Pt / TiO 2 nanotube arrays hydrogen sensor. The subject sensors exhibited a seven order of magnitude change in resistance with a response time of 13 s at room temperature upon exposure to 2000 ppm (parts per million) hydrogen. We investigated the hydrogen response of the Pt / TiO 2 sensors as a function of the length of the nanotubes and compared their activity with that of a reference film.

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Room-temperature hydrogen sensing performance of Nb2O5 nanorod arrays

RSC Advances ◽

10.1039/c8ra02329h ◽

2018 ◽

Vol 8 (30) ◽

pp. 16897-16901 ◽

Cited By ~ 9

Author(s):

Yanan Zou ◽

Jing He ◽

Yongming Hu ◽

Rui Huang ◽

Zhao Wang ◽

...

Keyword(s):

Room Temperature ◽

Hydrogen Sensor ◽

Nanorod Arrays ◽

Hydrogen Sensing ◽

Highly Sensitive ◽

Sensing Performance

A hydrogen sensor based on Nb2O5 nanorod arrays was synthesized and exhibited a fast and highly-sensitive response at room temperature.

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

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.803.120 ◽

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.

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The Role of ALD-ZnO Seed Layers in the Growth of ZnO Nanorods for Hydrogen Sensing

Micromachines ◽

10.3390/mi10070491 ◽

2019 ◽

Vol 10 (7) ◽

pp. 491 ◽

Cited By ~ 3

Author(s):

Yangming Lu ◽

Chiafen Hsieh ◽

Guanci Su

Keyword(s):

Zinc Oxide ◽

Surface Area ◽

Gas Sensing ◽

Zno Nanorods ◽

Clean Energy ◽

Hydrogen Sensor ◽

Zno Films ◽

Hydrogen Sensing ◽

Highly Sensitive ◽

Seed Layers

Hydrogen is one of the most important clean energy sources of the future. Because of its flammability, explosiveness, and flammability, it is important to develop a highly sensitive hydrogen sensor. Among many gas sensing materials, zinc oxide has excellent sensing properties and is therefore attracting attention. Effectively reducing the resistance of sensing materials and increasing the surface area of materials is an important issue to increase the sensitivity of gas sensing. Zinc oxide seed layers were prepared by atomic layer deposition (ALD) to facilitate the subsequent hydrothermal growth of ZnO nanorods. The nanorods are used as highly sensitive materials for sensing hydrogen due to their inherent properties as oxide semiconductors and their very high surface areas. The low resistance value of ALD-ZnO helps to transport electrons when sensing hydrogen gas and improves the sensitivity of hydrogen sensors. The large surface area of ZnO nanorods also provides lots of sites of gas adsorption which also increases the sensitivity of the hydrogen sensor. Our experimental results show that perfect crystallinity helped to reduce the electrical resistance of ALD-ZnO films. High areal nucleation density and sufficient inter-rod space were determining factors for efficient hydrogen sensing. The sensitivity increased with increasing hydrogen temperature, from 1.03 at 225 °C, to 1.32 at 380 °C after sensing 100 s in 10,000 ppm of hydrogen. We discuss in detail the properties of electrical conductivity, point defects, and crystal quality of ALD-ZnO films and their probable effects on the sensitivity of hydrogen sensing.

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Palladium thin films for plasmonic hydrogen gas sensing

Photonics Letters of Poland ◽

10.4302/plp.v11i2.914 ◽

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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