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.

HIGH SENSITIVE HYDROGEN SENSOR BY Pd/OXIDE/InGaP MOS STRUCTURE

2006 ◽  
Vol 20 (28) ◽  
pp. 1781-1787
Author(s):  
KAO-FENG YARN
Keyword(s):  
Room Temperature ◽  
High Sensitivity ◽  
Hydrogen Sensor ◽  
Native Oxide ◽  
Output Current ◽  
High Hydrogen ◽  
Phase Oxidation ◽  
High Oxidation ◽  
Experimental Formation

Experimental formation of LPO (liquid phase oxidation)-grown InGaP native oxide near room temperature (~60° C ) is demonstrated. A high oxidation rate is obtained and checked by SEM and AES. The native oxide is determined to be composed of InPO 4 and Ga 2 O 3, analyzed by the results of XPS measurement. Due to the presence of the excellent quality of InGaP native oxide, high hydrogen ( H 2) sensitivity in output current of a Pd /oxide/ InGaP MOS Schottky diode is observed. Under the applied voltage of -1 V and 50 ppm H 2/air, a high sensitivity of 1090 is obtained. An obvious variation of output current and a short response time due to the exposure to different H 2 concentration are also achieved. For example, the adsorption (τa) and desorption (τb) time constants under 50 ppm H 2/air are 2.3 s and 2.7 s, respectively.

A Room Temperature Hydrogen Sensor With High Sensitivity and Selectivity Using Nanocrystalline Semiconductor Particles

2005 ◽  
Author(s):  
Peng Zhang ◽  
Satyajit Shukla ◽  
Larry Ludwig ◽  
Hyoung J. Cho ◽  
Sudipta Seal
Keyword(s):  
Room Temperature ◽  
High Sensitivity ◽  
Hydrogen Sensor ◽  
Interdigitated Electrodes ◽  
Semiconductor Particles ◽  
Sensitivity And Selectivity ◽  
Good Repeatability ◽  
Nanocrystalline Semiconductor

Micro hydrogen sensor with interdigitated electrodes and indium doped nanopolycrystalline SnO2 particles was fabricated and tested. Giant sensitivity as high as 105 with good repeatability and recovery was observed. The sensor showed an excellant selectivity of hydrogen (H2) sensing over helium (He).

Highly Sensitive Room Temperature Hydrogen Sensors Based on Photochemically Deposited SnO2

2014 ◽  
Vol 787 ◽  
pp. 378-382 ◽  
Author(s):  
Masaya Ichimura ◽  
Dengbaoleer Ao
Keyword(s):  
Aqueous Solution ◽  
Room Temperature ◽  
Uv Light ◽  
High Sensitivity ◽  
Sensor Response ◽  
Hydrogen Sensors ◽  
Highly Sensitive ◽  
Initial Resistance ◽  
Very High ◽  
Higher Sensitivity

Highly sensitive room temperature hydrogen sensors based on undoped and Fe-doped SnO2 films were fabricated. The SnO2 films were deposited by the photochemical deposition using an aqueous solution containing SnSO4. For deposition of doped and undoped SnO2 films, a small amount of an aqueous solution was dropped on a glass substrate and irradiated by UV light. The sensors annealed at 200oC showed extremely high sensitivity to hydrogen, but the initial resistance was very high. The sensors annealed at 400oC had a much lower resistance, and thus the sensor response was able to be measured even by a pocket multimeter. The Fe-doped sample showed higher sensitivity compared with the undoped sample.

An excellent room-temperature hydrogen sensor based on titania nanotube-arrays

2012 ◽  
Vol 37 (18) ◽  
pp. 13602-13609 ◽  
Author(s):  
Kansong Chen ◽  
Kun Xie ◽  
Xinran Feng ◽  
Shengfu Wang ◽  
Rui Hu ◽  
...  
Keyword(s):  
Room Temperature ◽  
Hydrogen Sensor ◽  
Nanotube Arrays ◽  
Titania Nanotube Arrays ◽  
Titania Nanotube

scholarly journals A room-temperature ultrasonic hydrogen sensor based on a sensitive layer of reduced graphene oxide

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Xue-Yu Zhang ◽  
Ren-Hao Ma ◽  
Ling-Sheng Li ◽  
Li Fan ◽  
Yue-Tao Yang ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Frequency Shift ◽  
Reduced Graphene Oxide ◽  
Room Temperature ◽  
High Sensitivity ◽  
Hydrogen Sensor ◽  
Ultrasonic Sensor ◽  
Sensitive Layer ◽  
Reduced Graphene ◽  
Mass Load

AbstractIt is challenging to increase the sensitivity of a hydrogen sensor operating at room temperature due to weak sorption and tiny mass of hydrogen. In this work, an ultrasonic sensor is presented for detecting hydrogen, which is composed of a 128° YX-LiNbO3 substrate and a reduced graphene oxide (RGO) sensitive layer with a platinum catalyzer. By optimizing the depositing parameters of RGO and platinum, a considerably high sensitivity is achieved at room temperature. A frequency shift of 308.9 kHz is obtained in 100 ppm hydrogen mixed with argon, and a frequency shift of 24.4 kHz is obtained in 1000 ppm hydrogen mixed in synthetic air. It is demonstrated that in addition to strong sorption of the sensitive layer, the coaction of mass load and conductivity variation is key to high sensitivity of the sensor. By establishing the original conductivity of the sensitive layer within the “conductivity window” for enhancing electrical response, we improve the sensitivity of the ultrasonic sensor, which is available for detecting hydrogen with an extremely low concentration of 5 ppm.

scholarly journals Recent Advances and Challenges of Nanomaterials-Based Hydrogen Sensors

Micromachines ◽  
2021 ◽  
Vol 12 (11) ◽  
pp. 1429
Author(s):  
Bei Wang ◽  
Ling Sun ◽  
Martin Schneider-Ramelow ◽  
Klaus-Dieter Lang ◽  
Ha-Duong Ngo
Keyword(s):  
High Sensitivity ◽  
Hydrogen Sensor ◽  
Hydrogen Energy ◽  
Hydrogen Sensors ◽  
Oxide Semiconductors ◽  
Energy Applications ◽  
Hydrogen Sensing ◽  
Response Recovery ◽  
Sensitivity And Selectivity ◽  
Innovative Materials

Safety is a crucial issue in hydrogen energy applications due to the unique properties of hydrogen. Accordingly, a suitable hydrogen sensor for leakage detection must have at least high sensitivity and selectivity, rapid response/recovery, low power consumption and stable functionality, which requires further improvements on the available hydrogen sensors. In recent years, the mature development of nanomaterials engineering technologies, which facilitate the synthesis and modification of various materials, has opened up many possibilities for improving hydrogen sensing performance. Current research of hydrogen detection sensors based on both conservational and innovative materials are introduced in this review. This work mainly focuses on three material categories, i.e., transition metals, metal oxide semiconductors, and graphene and its derivatives. Different hydrogen sensing mechanisms, such as resistive, capacitive, optical and surface acoustic wave-based sensors, are also presented, and their sensing performances and influence based on different nanostructures and material combinations are compared and discussed, respectively. This review is concluded with a brief outlook and future development trends.

Pd/Oxide/InGaP MOS Schottky Hydrogen Sensor with Native Thin Oxide

2007 ◽  
Vol 121-123 ◽  
pp. 627-630
Author(s):  
Kao Feng Yarn ◽  
Y.L. Lin ◽  
M.C. Chure ◽  
K.K. Wu ◽  
S.C. Chang
Keyword(s):  
Room Temperature ◽  
High Sensitivity ◽  
Hydrogen Sensor ◽  
Native Oxide ◽  
Liquid Phase Deposition ◽  
Output Current ◽  
High Hydrogen ◽  
High Oxidation ◽  
First Time

Liquid phase deposition (LPD) grown InGaP native oxide near room temperature (~60oC) is demonstrated and investigated for the first time. A high oxidation rate (~80nm/hr) is obtained and checked by SEM and AES. The oxide is determined to be composed of InPO4 and Ga2O3 which are analyzed by the results of XPS measurement. Due to the presence of excellent quality of InGaP native oxide, high hydrogen (H2) sensitivity in output current of Pd/oxide/InGaP MOS Schottky diode is observed. Under the applied voltage of -1V and 50ppm H2/air, a high sensitivity of 1090 is obtained. In addition, an obvious variation of output current and a short response time due to the exposure to different H2 concentration are also achieved.

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

2014 ◽  
Vol 07 (03) ◽  
pp. 1450021 ◽  
Author(s):  
Kansong Chen ◽  
Kun Xie ◽  
Xinran Feng ◽  
Han Tian ◽  
Rui Hu ◽  
...  
Keyword(s):  
Room Temperature ◽  
Hydrogen Sensor ◽  
Nanotube Arrays ◽  
Platinum Electrodes ◽  
Hydrogen Sensing ◽  
Highly Sensitive ◽  
Order Of Magnitude ◽  
Hydrogen Response ◽  
The Subject ◽  
Glycol Solution

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.

Photon assisted room-temperature hydrogen sensors using PdO loaded WO 3 nanohybrids

2017 ◽  
Vol 42 (9) ◽  
pp. 6425-6434 ◽  
Author(s):  
Xin Geng ◽  
Yifan Luo ◽  
Bingbing Zheng ◽  
Chao Zhang
Keyword(s):  
Room Temperature ◽  
Hydrogen Sensors
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