Structural characteristics and UV-light enhanced gas sensitivity of La-doped ZnO nanoparticles

Chen, Ge; Xie, Changsheng; Hu, Mulin; Gui, Yanghai; Bai, Zikui; Zeng, Dawen

doi:10.1016/j.mseb.2007.05.008

Cited by 84 publications

(24 citation statements)

References 22 publications

(24 reference statements)

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“…5b. However, a higher percentage of Pd content would suppress the gas sensing properties, which is attributed to the decrease of the effective surface adsorption area [30].…”

Section: Sensing Performance and Mechanismmentioning

confidence: 99%

Optimization of Pd content in ZnO microstructures for high-performance gas detection

Gao

Sang

et al. 2014

J Mater Sci

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Pure ZnO and Pd/ZnO microstructures were prepared by hydrothermal method. The crystalline structures, morphology, and composition of synthesized hexagon hammer Pd/ZnO microstructures were analyzed by X-ray diffraction (XRD), scanning electron microscope (SEM), and energy dispersive X-ray spectroscopy (EDS). They were then studied for gas detection in order to achieve the optimal concentration of Pd in ZnO. Our results show that overall the Pd/ZnO microstructures have a better performance for ethanol detection comparing to the one without Pd, including a better sensitivity, a decreased operating temperature, and a shortened response/recovery time. At the optimal Pd concentration of 0.25 wt%, we observed a sensitivity enhancement of 3.5 times larger than that of ZnO without doping and a response and recovery time of 10 and 7 s, respectively. Moreover, the Pd/ZnO sensors could show a high selectivity and an excellent chemical stability, thereby providing a way to improve the gas sensing performances.

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“…5b. However, a higher percentage of Pd content would suppress the gas sensing properties, which is attributed to the decrease of the effective surface adsorption area [30].…”

Section: Sensing Performance and Mechanismmentioning

confidence: 99%

Optimization of Pd content in ZnO microstructures for high-performance gas detection

Gao

Sang

et al. 2014

J Mater Sci

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“…In recent years, several reports on the use of photoactivation to increase gas sensitivity of a metal oxide semiconductor (MOS) appeared. The vast majority of publications are devoted to study of MOS sensor properties under UV illumination [11][12][13][14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Effect of light irradiation on the gas sensor characteristics of the SnO2 and ZnO modified by tetrathiafulvalene derivative

Lukovskaya¹,

Федорова²,

Glazova³

et al. 2015

Organic Photonics and Photovoltaics

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“…While at higher temperatures, desorption of oxygen species from the sensor surfaces leads to decrease the concentration of oxygen species. So, the high sensitivity values of gases at temperature of 300˚C can be to the high concentration of adsorbed oxygen species and high oxidation activity of gases [21][22][23]. The results in Table 2 show that the sensitivity is increased when the concentration of Ce increase.…”

Section: Resultsmentioning

confidence: 99%

Synthesis of Fibrous-Like Stripes ZnO: Ce Nano Structures for NO2 and NH3 Sensing

Sabry¹

2015

IJIRSET

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ABSTRACT:Zinc oxide and Ce doped nanostructures thin films with different ZnO:Ce ratios (3, 5 and 10) wt% have been prepared by Sol-gel spin coating method at optimum annealing temperature of 550 ˚C. The synthesized samples were characterized by X-ray diffraction (XRD), the spectra of the pure and ZnO: Ce nanostructures correspond to the various planes of a hexagonal ZnO phase, also the crystalline size decreased from about 37nm to 27nm by increasing Ce concentration, atomic force microscopy (AFM) analysis shows that the surface roughness of the samples increased from 1.14 for pure ZnO to 2.15 nm for 10% doping. FESEM measurements show that the ZnO is spherical shape particles which transfers into fibrous-like stripes embedded within a wrinkled shape with different size depending upon the Ce concentration. This change in the surface shape can improve the NO 2 and NH 3 sensing in the two cases of gas sensing measurements, namely static and dynamic case. It was found that the sensitivity was increased by using the same operating temperature. The dynamic results show that the response and recovery times are improved when the Ce concentration is increased. The optical measurements are shown that the transmittance was decreased with increasing of Ce concentration in zinc oxide.

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Structural characteristics and UV-light enhanced gas sensitivity of La-doped ZnO nanoparticles

Cited by 84 publications

References 22 publications

Optimization of Pd content in ZnO microstructures for high-performance gas detection

Optimization of Pd content in ZnO microstructures for high-performance gas detection

Effect of light irradiation on the gas sensor characteristics of the SnO2 and ZnO modified by tetrathiafulvalene derivative

Synthesis of Fibrous-Like Stripes ZnO: Ce Nano Structures for NO2 and NH3 Sensing

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