scholarly journals Multi-component (Ag–Au–Cu–Pd–Pt) alloy nanoparticle-decorated p-type 2D-molybdenum disulfide (MoS2) for enhanced hydrogen sensing

Nanoscale ◽  
2020 ◽  
Vol 12 (22) ◽  
pp. 11830-11841 ◽  
Author(s):  
Kusuma M. B. Urs ◽  
Nirmal Kumar Katiyar ◽  
Ritesh Kumar ◽  
Krishanu Biswas ◽  
Abhishek K. Singh ◽  
...  
Keyword(s):  
Work Function ◽  
Molybdenum Disulfide ◽  
Ohmic Contact ◽  
Hydrogen Gas ◽  
Gold Electrodes ◽  
Alloy Nanoparticles ◽  
Hydrogen Sensing ◽  
Pt Alloy ◽  
P Type

The nanoscale interface between multi-component (Ag–Au–Cu–Pd–Pt) alloy nanoparticles on MoS2 sheets increase its work function making an ohmic contact into Schottky with gold electrodes. This drastically enhances response towards hydrogen gas.

scholarly journals Significant Enhancement of Hydrogen-Sensing Properties of ZnO Nanofibers through NiO Loading

Nanomaterials ◽  
2018 ◽  
Vol 8 (11) ◽  
pp. 902 ◽  
Author(s):  
Jae-Hyoung Lee ◽  
Jin-Young Kim ◽  
Ali Mirzaei ◽  
Hyoun Kim ◽  
Sang Kim
Keyword(s):  
Metal Oxide ◽  
Gas Sensors ◽  
High Performance ◽  
Gas Sensing ◽  
Hydrogen Gas ◽  
Electrospinning Technique ◽  
Calcination Process ◽  
Hydrogen Sensing ◽  
Zno Nanofibers ◽  
P Type

Metal oxide p-n heterojunction nanofibers (NFs) are among the most promising approaches to enhancing the efficiency of gas sensors. In this paper, we report the preparation of a series of p-NiO-loaded n-ZnO NFs, namely (1−x)ZnO-xNiO (x = 0.03, 0.05, 0.7, 0.1, and 0.15 wt%), for hydrogen gas sensing experiments. Samples were prepared through the electrospinning technique followed by a calcination process. The sensing experiments showed that the sample with 0.05 wt% NiO loading resulted in the highest sensing performance at an optimal sensing temperature of 200 °C. The sensing mechanism is discussed in detail and contributions of the p-n heterojunctions, metallization of ZnO and catalytic effect of NiO on the sensing enhancements of an optimized gas sensor are analyzed. This study demonstrates the possibility of fabricating high-performance H2 sensors through the optimization of p-type metal oxide loading on the surfaces of n-type metal oxides.

One-pot preparation of Pd–Pt alloy nanoparticles and their hydrogen gas interaction

2019 ◽  
Vol 59 (SA) ◽  
pp. SAAC04
Author(s):  
Masakuni Ozawa ◽  
Takamasa Matsubara ◽  
Masatomo Hattori
Keyword(s):  
Hydrogen Gas ◽  
Alloy Nanoparticles ◽  
One Pot ◽  
Pt Alloy

scholarly journals Significant Enhancement of Hydrogen-Sensing Properties of ZnO Nanofibers through NiO Loading

2018 ◽  
Author(s):  
Jae-Hyoung Lee ◽  
Jin-Young Kim ◽  
Ali Mirzaei ◽  
Hyoun Woo Kim ◽  
Sang Sub Kim
Keyword(s):  
Metal Oxide ◽  
Gas Sensors ◽  
High Performance ◽  
Gas Sensing ◽  
Hydrogen Gas ◽  
Electrospinning Technique ◽  
Calcination Process ◽  
Hydrogen Sensing ◽  
Zno Nanofibers ◽  
P Type

Metal oxide p-n heterojunction nanofibers (NFs) are among the most promising approaches to enhancing the efficiency of gas sensors. In this paper, we report the preparation of a series of p-NiO-loaded n-ZnO NFs, namely (1 − x) ZnO-xNiO (x = 0.03, 0.05, and 0.1 wt%), for hydrogen gas sensing experiments. Samples were prepared through the electrospinning technique followed by a calcination process. The sensing experiments showed that the sample with 0.05 wt% NiO loading resulted in the highest sensing performance at an optimal sensing temperature of 200 °C. The sensing mechanism is discussed in detail and contributions of the p-n heterojunctions, metallization of ZnO and catalytic effect of NiO on the sensing enhancements of an optimized gas sensor are analyzed. This study demonstrates the possibility of fabricating high-performance H2 sensors through the optimization of p-type metal oxide loading on the surfaces of n-type metal oxides.

scholarly journals Devices based on series-connected Schottky junctions and β-Ga<sub>2</sub>O<sub>3</sub>/SiC heterojunctions characterized as hydrogen sensors

2014 ◽  
Vol 3 (2) ◽  
pp. 231-239 ◽  
Author(s):  
S. Nakagomi ◽  
K. Yokoyama ◽  
Y. Kokubun
Keyword(s):  
Field Effect ◽  
Oxygen Plasma ◽  
Hydrogen Gas ◽  
Hydrogen Sensors ◽  
Pt Electrode ◽  
Sensing Properties ◽  
Hydrogen Sensing ◽  
Forward Current ◽  
Schottky Junctions ◽  
P Type

Abstract. Field-effect hydrogen gas sensor devices were fabricated with the structure of a series connection between Schottky junctions and β-Ga2O3/6H-SiC heterojunctions. β-Ga2O3 thin films were deposited on n-type and p-type 6H-SiC substrates by gallium evaporation in oxygen plasma. These devices have rectifying properties and were characterized as hydrogen sensors by a Pt electrode. The hydrogen-sensing properties of both devices were measured in the range of 300–500 °C. The Pt/Ga2O3/n-SiC device revealed hydrogen-sensing properties as conventional Schottky diode-type devices. The forward current of the Pt/Ga2O3/p-SiC device was significantly increased under exposure to hydrogen. The behaviors of hydrogen sensing of the devices were explained using band diagrams of the Pt/Ga2O3/SiC structure biased in the forward and reverse directions.

Morphological study of the Al–Ti ohmic contact to p-type SiC

2002 ◽  
Vol 46 (5) ◽  
pp. 689-693 ◽  
Author(s):  
S.E. Mohney ◽  
B.A. Hull ◽  
J.Y. Lin ◽  
J. Crofton
Keyword(s):  
Ohmic Contact ◽  
Morphological Study ◽  
P Type

Ohmic contact to nonpolara-plane p-type GaN using Ni/Au

2014 ◽  
Vol 53 (5S3) ◽  
pp. 05HA04 ◽  
Author(s):  
Jae-Kwan Kim ◽  
Dong-min Lee ◽  
Sung-Nam Lee ◽  
Keun-Man Song ◽  
Jae-Sik Yoon ◽  
...  
Keyword(s):  
Ohmic Contact ◽  
P Type
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