Hydrogen sensing properties of ZnO nanorods: Effects of annealing, temperature and electrode structure

Öztürk, Sadullah; Kılınç, Necmettin; Torun, İmren; Kösemen, Arif; Şahin, Yasin; Öztürk, Zafer Ziya

doi:10.1016/j.ijhydene.2014.01.066

Cited by 51 publications

(12 citation statements)

References 64 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It has a great potential as an energy option in many industrial and technological applications. 3 The common hydrogen-gas sensors based on metal-oxides such as SnO 2 , 4 In 2 O 3 , 5 ZnO, 6 NiO, 7 and TiO 2 , 8 have shown appropriate sensitivities, however, from the power consumption point of view, they may not be favorable due to their operation at high temperatures. 1,2 The promising use of H 2 can help meet the always growing energy demand; however, in order to implement it, H 2 monitoring and leak detection systems are required because it is invisible, odorless and highly flammable.…”

Section: Introductionmentioning

confidence: 99%

Hydrogen-gas sensors based on graphene functionalized palladium nanoparticles: impedance response as a valuable sensor

2015

View full text Add to dashboard Cite

a Palladium-graphene nanostructures (PdGO) with high-quality-graphene layers and well monodispersed palladium nanoparticles (PdNPs) were synthesized by the hydrothermal microwave exfoliation method. The structural and morphological characteristics of PdGO were investigated, and the results indicate that the hydrothermal-microwave method allows both the reduction of the metal precursors and their anchorage on highly exfoliated graphene layers. The synthesized PdGO was then deposited as active layers for sensing hydrogen gas (H2). PdGO-based sensors with gas concentrations from 0.01 to 5 vol. % in air exhibited a very reproducible performance with fast response times (~30 seg) and recovery behavior at room temperature. Impedance response results as a high sensitive feasible sensor technique. Our results show that it is feasible to obtain an efficient H2-sensor with reliable and reproducible sensing properties by means of a simple and cost-effective preparation method under real atmospheric conditions.

show abstract

Section: Introductionmentioning

confidence: 99%

Hydrogen-gas sensors based on graphene functionalized palladium nanoparticles: impedance response as a valuable sensor

2015

View full text Add to dashboard Cite

show abstract

“…Thus, oxygen vacancies always serve as preferential adsorption sites. As vacuum annealing treatment will generate oxygen vacancies in the metal oxide nanomaterials, the remarkable increase in adsorbed oxygen after vacuum annealing treatment should be attributed to the increase in oxygen vacancies [ 25 ].…”

Section: Resultsmentioning

confidence: 99%

Remarkably Enhanced Room-Temperature Hydrogen Sensing of SnO2 Nanoflowers via Vacuum Annealing Treatment

Liu

Zhao

Chen

et al. 2018

Sensors

View full text Add to dashboard Cite

In this work, SnO2 nanoflowers synthesized by a hydrothermal method were employed as hydrogen sensing materials. The as-synthesized SnO2 nanoflowers consisted of cuboid-like SnO2 nanorods with tetragonal structures. A great increase in the relative content of surface-adsorbed oxygen was observed after the vacuum annealing treatment, and this increase could have been due to the increase in surface oxygen vacancies serving as preferential adsorption sites for oxygen species. Annealing treatment resulted in an 8% increase in the specific surface area of the samples. Moreover, the conductivity of the sensors decreased after the annealing treatment, which should be attributed to the increase in electron scattering around the defects and the compensated donor behavior of the oxygen vacancies due to the surface oxygen adsorption. The hydrogen sensors of the annealed samples, compared to those of the unannealed samples, exhibited a much higher sensitivity and faster response rate. The sensor response factor and response rate increased from 27.1% to 80.2% and 0.34%/s to 1.15%/s, respectively. This remarkable enhancement in sensing performance induced by the annealing treatment could be attributed to the larger specific surface areas and higher amount of surface-adsorbed oxygen, which provides a greater reaction space for hydrogen. Moreover, the sensors with annealed SnO2 nanoflowers also exhibited high selectivity towards hydrogen against CH4, CO, and ethanol.

show abstract

“…This is considered by the relation of their high surface to volume ratio, highly active center, along with other factors [12]. The application of ZnO nanostructures with respect to the detection of various gases such as NO 2 [5][6][7]12], CO [13], H 2 [14], and ethanol [15,16] has been widely investigated. Conversely, to effect a reduction of the operating temperature to room temperature, the application of metal oxide gas sensors with the assistance of UV light has been a mostly feasible approach [17,18].…”

Section: Introductionmentioning

confidence: 99%

Correlation between optical characteristics and NO2 gas sensing performance of ZnO nanorods under UV assistance

Thu¹,

Pham²,

Giang³

et al. 2018

VJSTE

View full text Add to dashboard Cite

In this research, we present the ZnO nanorods synthesized through the simple route of the hydrothermal method. The ZnO nanorods were developed through the application of only zinc acetate Zn(CH3COO)2 and ammonia solution, NH4OH, in the hydrothermal process at 150oC for 10 hours. The size of the ZnO nanorods was defined as approximately 300 nm in diameter and 1-2 μm in length. The fabrication of sensors was achieved through drop-coating of synthesized ZnO nanorods on Al2O3 substrates integrated with Au electrodes. Subsequent to the process of sintering done at 500oC for different durations, ZnO nanorod-based sensors were investigated when exposed to NO2 gas (1.5, 2.5, and 5 ppm) at room temperature under continuous UV-LED (385 nm) illumination. The correlation between NO2 gas sensing performance and the optical property of the ZnO nanorods is discussed in detail. Herein, the defect concentration, particularly in the surface region of the ZnO nanorods could be modified through sintering, and this indicates its importance in the reduction of response-recovery times and enhancement of high sensitivity to NO2 gas.

show abstract

Hydrogen sensing properties of ZnO nanorods: Effects of annealing, temperature and electrode structure

Cited by 51 publications

References 64 publications

Hydrogen-gas sensors based on graphene functionalized palladium nanoparticles: impedance response as a valuable sensor

Hydrogen-gas sensors based on graphene functionalized palladium nanoparticles: impedance response as a valuable sensor

Remarkably Enhanced Room-Temperature Hydrogen Sensing of SnO2 Nanoflowers via Vacuum Annealing Treatment

Correlation between optical characteristics and NO2 gas sensing performance of ZnO nanorods under UV assistance

Contact Info

Product

Resources

About