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.

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 Fiber Optical Hydrogen Sensor Based on WO3-Pd2Pt-Pt Nanocomposite Films

Nanomaterials ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 128
Author(s):  
Jixiang Dai ◽  
Yi Li ◽  
Hongbo Ruan ◽  
Zhuang Ye ◽  
Nianyao Chai ◽  
...  
Keyword(s):  
Optical Power ◽  
Single Mode ◽  
Hydrogen Sensor ◽  
Single Mode Fiber ◽  
Nanocomposite Films ◽  
Electric Signal ◽  
Hydrogen Sensing ◽  
Air Atmosphere ◽  
Sensing Material ◽  
Wide Range

In this paper, WO3-Pd2Pt-Pt nanocomposite films were deposited on a single mode fiber as the hydrogen sensing material, which changes its reflectivity under different hydrogen concentration. The reflectivity variation was probed and converted to an electric signal by a pair of balanced InGaAs photoelectric detectors. In addition, the performance of the WO3-Pd2Pt-Pt composite film was investigated under different optical powers, and the irrigating power was optimized at 5 mW. With the irrigation of this optical power, the hydrogen sensitive film exhibits quick response toward 100 ppm hydrogen in air atmosphere at a room temperature of 25 °C. The experimental results demonstrate a high resolution at 5 parts per million (ppm) within a wide range from 100 to 5000 ppm in air. This simple and compact sensing system can detect hydrogen concentrations far below the explosion limit and provide early alert for hydrogen leakage, showing great potential in hydrogen-related applications.

scholarly journals Drift-corrected nanoplasmonic hydrogen sensing by polarization

Nanoscale ◽  
2015 ◽  
Vol 7 (25) ◽  
pp. 10963-10969 ◽  
Author(s):  
Carl Wadell ◽  
Christoph Langhammer
Keyword(s):  
Large Scale ◽  
Light Polarization ◽  
Hydrogen Sensors ◽  
Storage Medium ◽  
Enabling Technology ◽  
Drift Correction ◽  
Plasmonic Sensors ◽  
Hydrogen Sensing ◽  
Sensing Material

Accurate and reliable hydrogen sensors are an important enabling technology for the large-scale introduction of hydrogen as a fuel or energy storage medium. To enable the long-term use of plasmonic sensors in this particular context, we introduce a concept for drift-correction based on light polarization utilizing symmetric sensor and sensing material nanoparticles arranged in a heterodimer.

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.

Electrophoretic Deposition of Metal Nanoparticle Monolayers from Nonpolar Solvents for Hydrogen Sensing

2015 ◽  
Vol 654 ◽  
pp. 213-217 ◽  
Author(s):  
Jan Grym ◽  
Roman Yatskiv ◽  
Ondřej Černohorský ◽  
María Verde ◽  
Jan Lorinčík ◽  
...  
Keyword(s):  
Electrophoretic Deposition ◽  
Reverse Micelles ◽  
Three Dimensional ◽  
Fast Response ◽  
Metal Nanoparticle ◽  
Hydrogen Sensors ◽  
Hydrogen Sensing ◽  
Nonpolar Solvents ◽  
Dimensional Growth ◽  
High Degree

We report on the electrophoretic deposition (EPD) of metal nanoparticles (NPs) prepared in reverse micelles on semiconductor substrates with the aim to fabricate sensitive Schottky-based hydrogen sensors with fast response and high degree of selectivity. We discuss the mechanism of NP monolayer formation and show which parameters are essential for the transition from three-dimensional to two-dimensional growth.

Pd/AlN/Si or SiC Structure for Hydrogen Sensing Device

2000 ◽  
Vol 622 ◽  
Author(s):  
Flaminia Serina ◽  
C. Huang ◽  
G. W. Auner ◽  
R. Naik ◽  
S. Ng ◽  
...  
Keyword(s):  
Molecular Beam ◽  
Hydrogen Sensor ◽  
Plasma Source ◽  
Metal Electrode ◽  
Pressure Effects ◽  
Mis Structure ◽  
Hydrocarbon Gases ◽  
Hydrogen Sensing ◽  
Design Structure ◽  
Aln Film

ABSTRACTAn AlN (insulator) MIS Hydrogen Sensor was created using plasma source molecular beam epitaxy (PSMBE) deposition on Si (111) and 6H-SiC. A Pd layer was deposited on top of the AlN film via magnetron sputtering technique utilizing a hard mask. Pd was chosen since H2 readily diffuses within its bulk, thus Pd acts not only as a metal electrode of the MIS structure, but also as a catalyst for hydrogen dissociation. To optimize the design structure several sensors with different AlN and Pd thickness have been developed. RHEED and XRD measurements show that AlN film is epitaxial on both Si (111) and 6H-SiC substrates. The sensors were characterized using capacitance versus voltage C(V) and I(V) measurements, at different frequencies ranging from 1kHz to 1 MHz. Shifts in the C-V and I-V curves occurred with the introduction of hydrogen in the chamber. The temperature, hydrogen partial pressure, effects of oxygen and hydrocarbon gases, insulator and metal thicknesses on sensor response were analyzed.

scholarly journals Enhanced Hydrogen Detection in ppb-Level by Electrospun SnO2-Loaded ZnO Nanofibers

Sensors ◽  
2019 ◽  
Vol 19 (3) ◽  
pp. 726 ◽  
Author(s):  
Jae-Hyoung Lee ◽  
Jin-Young Kim ◽  
Jae-Hun Kim ◽  
Sang Kim
Keyword(s):  
Gas Sensor ◽  
High Performance ◽  
Hydrogen Gas ◽  
Hydrogen Sensors ◽  
Excellent Performance ◽  
Electrospinning Technique ◽  
Hydrogen Sensing ◽  
Working Temperature ◽  
Highly Sensitive ◽  
Zno Nanofibers

High-performance hydrogen sensors are important in many industries to effectively address safety concerns related to the production, delivering, storage and use of H2 gas. Herein, we present a highly sensitive hydrogen gas sensor based on SnO2-loaded ZnO nanofibers (NFs). The xSnO2-loaded (x = 0.05, 0.1 and 0.15) ZnO NFs were fabricated using an electrospinning technique followed by calcination at high temperature. Microscopic analyses demonstrated the formation of NFs with expected morphology and chemical composition. Hydrogen sensing studies were performed at various temperatures and the optimal working temperature was selected as 300 °C. The optimal gas sensor (0.1 SnO2 loaded ZnO NFs) not only showed a high response to 50 ppb hydrogen gas, but also showed an excellent selectivity to hydrogen gas. The excellent performance of the gas sensor to hydrogen gas was mainly related to the formation of SnO2-ZnO heterojunctions and the metallization effect of ZnO.

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.

Greatly etched fiber Bragg grating hydrogen sensor with Pd/Ni composite film as sensing material

2012 ◽  
Vol 174 ◽  
pp. 253-257 ◽  
Author(s):  
Jixiang Dai ◽  
Minghong Yang ◽  
Xun Yu ◽  
Kun Cao ◽  
Junsheng Liao
Keyword(s):  
Composite Film ◽  
Fiber Bragg Grating ◽  
Hydrogen Sensor ◽  
Bragg Grating ◽  
Sensing Material
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