Superiorly sensitive and selective H2 sensor based on p-n heterojunction of WO3–CoO nanohybrids and its sensing mechanism

Ding, Wei; Ansari, N.; Yang, Yanhui; Bachagha, Kareem

doi:10.1016/j.ijhydene.2021.06.070

Cited by 17 publications

(9 citation statements)

References 60 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…STN 1.5 650 performed better than several semiconductors, including highly accredited materials such as SnO 2 and Pd-decorated and Co-doped SnO 2 , 50 − 52 WO 3 , 53 CuO, 54 WO 3 –CuO junction, 53 ZnO, and Ag-doped ZnO. 55 Moreover, its experimental LOD of 0.4 ppm was far lower than that reported in some recently accredited works.…”

Section: Resultsmentioning

confidence: 73%

“…STN 1.5 650 performed better than several semiconductors, including highly accredited materials such as SnO 2 and Pd-decorated and Co-doped SnO 2 , − WO 3 , CuO, WO 3 –CuO junction, ZnO, and Ag-doped ZnO . Moreover, its experimental LOD of 0.4 ppm was far lower than that reported in some recently accredited works. , As far as our knowledge is concerned, the best experimental result regarding H 2 sensing was obtained by Wang et al, recording a LOD of 0.25 ppm at R air / R gas = 3. However, the LOD for STN 1.5 650 was 0.4 ppm, but with a response of 5.6.…”

Section: Resultsmentioning

confidence: 79%

“… 55 Moreover, its experimental LOD of 0.4 ppm was far lower than that reported in some recently accredited works. 52 , 53 As far as our knowledge is concerned, the best experimental result regarding H 2 sensing was obtained by Wang et al, 51 recording a LOD of 0.25 ppm at R air / R gas = 3. However, the LOD for STN 1.5 650 was 0.4 ppm, but with a response of 5.6.…”

Section: Resultsmentioning

confidence: 99%

“…The response of STN 1.5 650 to H 2 and that of other sensing films based on different metal-oxide semiconductors from the literature are reported in Table 4. STN 1.5 650 performed better than several semiconductors, including highly accredited materials such as SnO 2 and Pddecorated and Co-doped SnO 2 , 50−52 WO 3 , 53 CuO, 54 WO 3 − CuO junction, 53 ZnO, and Ag-doped ZnO. 55 Moreover, its experimental LOD of 0.4 ppm was far lower than that reported in some recently accredited works.…”

Section: ■ Experimental Sectionmentioning

confidence: 88%

See 3 more Smart Citations

Design of a Metal-Oxide Solid Solution for Sub-ppm H₂ Detection

et al. 2022

View full text Add to dashboard Cite

Hydrogen is largely adopted in industrial processes and is one of the leading options for storing renewable energy. Due to its high explosivity, detection of H 2 has become essential for safety in industries, storage, and transportation. This work aims to design a sensing film for high-sensitivity H 2 detection. Chemoresistive gas sensors have extensively been studied for H 2 monitoring due to their good sensitivity and low cost. However, further research and development are still needed for a reliable H 2 detection at sub-ppm concentrations. Metal-oxide solid solutions represent a valuable approach for tuning the sensing properties by modifying their composition, morphology, and structure. The work started from a solid solution of Sn and Ti oxides, which is known to exhibit high sensitivity toward H 2 . Such a solid solution was empowered by the addition of Nb, which—according to earlier studies on titania films—was expected to inhibit grain growth at high temperatures, to reduce the film resistance and to impact the sensor selectivity and sensitivity. Powders were synthesized through the sol–gel technique by keeping the Sn–Ti ratio constant at the optimal value for H 2 detection with different Nb concentrations (1.5–5 atom %). Such solid solutions were thermally treated at 650 and 850 °C. The sensor based on the solid solution calcined at 650 °C and with the lowest content of Nb exhibited an extremely high sensitivity toward H 2 , paving the way for H 2 ppb detection. For comparison, the response to 50 ppm of H 2 was increased 6 times vs SnO 2 and twice that of (Sn,Ti) x O 2 .

show abstract

Section: Resultsmentioning

confidence: 73%

Section: Resultsmentioning

confidence: 79%

Section: Resultsmentioning

confidence: 99%

Section: ■ Experimental Sectionmentioning

confidence: 88%

See 2 more Smart Citations

Design of a Metal-Oxide Solid Solution for Sub-ppm H₂ Detection

et al. 2022

View full text Add to dashboard Cite

show abstract

“…In recent years, several materials have been used to fabricate gas sensors. Among them, metal oxide materials, such as zinc oxide (ZnO), , indium oxide (In 2 O 3 ), , tungsten trioxide (WO 3 ), , and gallium oxide (Ga 2 O 3 ), , have garnered significant attention due to their low cost, simple fabrication, small size, and ease manipulation. − In view of their considerable surface-to-volume ratio and more surface gas adsorption sites, nanomaterials and nanostructures are deliberately applied to the gas sensors to improve their performances. − In spite of the fact that homojunctions are formed between nanostructures to improve the sensitivity of gas sensors, , the formation of p–n heterojunctions between nanostructures can effectively promote the sensitivity and the resistance change. − Recently, to further enhance the performances of gas sensors by using an enhanced metal spillover phenomenon, the structures of metal-decorated metal oxide nanorods have been extensively studied and developed. − …”

mentioning

confidence: 99%

Sensing Mechanism and Characterization of NO₂ Gas Sensors Using Gold-Black NP-Decorated Ga₂O₃ Nanorod Sensing Membranes

Chu,

Wu,

Yeh

et al. 2023

ACS Sens.

View full text Add to dashboard Cite

In this work, a vapor cooling condensation system was utilized to deposit various amounts of p-type gold-black nanoparticles (NPs) onto the surface of n-type gallium oxide (Ga 2 O 3 ) nanorods forming p−n heterojunction-structured sensing membranes of nitrogen dioxide (NO 2 ) gas sensors. The role and the sensing mechanism of the various gold-black NP-decorated Ga 2 O 3 nanorods in NO 2 gas sensors were investigated. The coverage and atomic percentage of the sensing membranes were observed using high-resolution transmission electron microscopy (HRTEM) measurements and energy-dispersive spectroscopy (EDS), respectively. For the NO 2 gas sensor using the sensing membrane of 60 s-deposited gold-black NP-decorated Ga 2 O 3 nanorods under a NO 2 concentration of 10 ppm, the highest responsivity of 5221.1% was obtained. This result was attributed to the spillover effect and the formation of the p−n heterojunction, which increased more ionized-oxygen adsorption sites and promoted the reaction between NO 2 gas and Ga 2 O 3 nanorods. Furthermore, the NO 2 gas sensor could detect the low NO 2 concentration of 100 ppb and achieved a responsivity of 56.9%. The resulting NO 2 gas sensor also exhibited excellent selectivity for detecting NO 2 gas, with higher responsivity at a NO 2 concentration of 10 ppm compared with that of the C 2 H 5 OH and NH 3 concentrations of 100 ppm.

show abstract

Enhanced H2 gas sensing performances by Pd-loaded In2O3 microspheres

Tang,

Qin,

Sun

et al. 2024

Appl. Phys. A

View full text Add to dashboard Cite

Superiorly sensitive and selective H2 sensor based on p-n heterojunction of WO3–CoO nanohybrids and its sensing mechanism

Cited by 17 publications

References 60 publications

Design of a Metal-Oxide Solid Solution for Sub-ppm H₂ Detection

Design of a Metal-Oxide Solid Solution for Sub-ppm H₂ Detection

Sensing Mechanism and Characterization of NO₂ Gas Sensors Using Gold-Black NP-Decorated Ga₂O₃ Nanorod Sensing Membranes

Enhanced H2 gas sensing performances by Pd-loaded In2O3 microspheres

Contact Info

Product

Resources

About

Superiorly sensitive and selective H2 sensor based on p-n heterojunction of WO3–CoO nanohybrids and its sensing mechanism

Cited by 17 publications

References 60 publications

Design of a Metal-Oxide Solid Solution for Sub-ppm H2 Detection

Design of a Metal-Oxide Solid Solution for Sub-ppm H2 Detection

Sensing Mechanism and Characterization of NO2 Gas Sensors Using Gold-Black NP-Decorated Ga2O3 Nanorod Sensing Membranes

Enhanced H2 gas sensing performances by Pd-loaded In2O3 microspheres

Contact Info

Product

Resources

About

Design of a Metal-Oxide Solid Solution for Sub-ppm H₂ Detection

Design of a Metal-Oxide Solid Solution for Sub-ppm H₂ Detection

Sensing Mechanism and Characterization of NO₂ Gas Sensors Using Gold-Black NP-Decorated Ga₂O₃ Nanorod Sensing Membranes