Improvement in CO sensing characteristics by decorating ZnO nanorod arrays with Pd nanoparticles and the related mechanisms

Chang, Chia–Ming; Hon, Min–Hsiung; Leu, Ing‐Chi

doi:10.1039/c2ra01016j

Cited by 87 publications

(85 citation statements)

References 37 publications

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“…It was partitioned into three Gaussian curves, whose peaks at 530.0, 531.0, and 532.25 eV annotated as O1, O2, and O3, respectively. As reported in previous works [22], the lower binding energy peak (O1) centered at 530.0 eV is closely associated with O 2-ions of the ZnO lattice oxygen. The medium energy peak (O2) at 531.0 eV is attributed to O 2-ions in the presence of the surface hydroxyl groups (-OH), while the higher energy peak (O3) is usually due to the specific chemisorbed oxygen on the surface of ZnO, such as O -, O 2-, or O 2 -which is the most important factor for gas sensing processes.…”

Section: Resultsmentioning

confidence: 72%

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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Section: Resultsmentioning

confidence: 72%

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

Gao

Sang

et al. 2014

J Mater Sci

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“…A clear lattice fringe spacing of 0.23 nm for Pd NPs can be observed in Fig. 3(c), which is similar to the lattice spacing of Pd (1 1 1) [34]. Moreover, additional HRTEM images of ZnO NRs were taken without Pd catalyst to determine the clear lattice fringe of ZnO.…”

Section: Fig 1(a)-(d) Show Typical Sem Images Of Vertically Well-alimentioning

confidence: 69%

Effect of Ga-modified layer on flexible hydrogen sensor using ZnO nanorods decorated by Pd catalysts

Rashid

Phan

Chung

2014

Sensors and Actuators B: Chemical

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“…Fig. 39,40 ZnO is an n-type semiconductor and its resistance is mainly determined by the conduction band electrons. Fig.…”

Section: Resultsmentioning

confidence: 99%

Synthesis and highly enhanced acetylene sensing properties of Au nanoparticle-decorated hexagonal ZnO nanorings

Lin

et al. 2015

RSC Adv.

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Hexagonal ZnO nanorings were synthesized by a one-step hydrothermal method and Au nanoparticles were decorated on the surface of ZnO nanorings through a facile deposition process. The as-prepared ZnO nanorings showed the well-defined hexagonal shape with a width of 0.75 μm ~ 1.4 μm, a thickness of 0.17 μm ~ 0.33 μm and a hollow size of 0.2 μm ~ 1 μm. For the Au nanoparticle-decorated hexagonal ZnO nanorings (Au-ZnO nanorings), Au nanoparticles with a size of 3 nm ~ 10 nm distributed discretely on the surface of ZnO nanorings. The acetylene sensing performance of the ZnO nanorings and Au-ZnO nanorings were tested. The results indicated that the Au-ZnO nanorings showed a higher response (28 to 100 ppm acetylene), lower operating temperature (255 °C), faster response/recovery speed (less than 9 s and 5 s, respectively), and lower detectable acetylene minimum concentration (about 1 ppm). In addition, the machenism about the enhanced acetylene-sensing performance of the Au-ZnO nanorings were discussed.Please do not adjust margins Please do not adjust margins diffusion and provides more active sites for oxygen adsorption and the reaction between adsorbed oxygen species and acetylene, which also contributes to the high response and rapid response/recovery rate.

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Improvement in CO sensing characteristics by decorating ZnO nanorod arrays with Pd nanoparticles and the related mechanisms

Cited by 87 publications

References 37 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 Ga-modified layer on flexible hydrogen sensor using ZnO nanorods decorated by Pd catalysts

Synthesis and highly enhanced acetylene sensing properties of Au nanoparticle-decorated hexagonal ZnO nanorings

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