X-ray studies on optical and structural properties of ZnO nanostructured thin films

Larcheri, S.; Armellini, C.; Rocca, F.; Kuzmin, Alexei; Kalendarev, R.; Dalba, G.; Graziola, R.; Purans, J.; Pailharey, D.; Jandard, F.

doi:10.1016/j.spmi.2005.08.048

Cited by 38 publications

(22 citation statements)

References 12 publications

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“…4). Such changes can arise from variations in the zinc coordination sphere [18,20,21]. The minor edge shift to lower energy and the decreased intensity of the main feature may indeed indicate that a partial reduction, e.g., some loss of oxygen, has really happened [22].…”

Section: Resultsmentioning

confidence: 99%

Dynamical Changes in the Cu–ZnO x Interaction Observed in a Model Methanol Synthesis Catalyst

et al. 2008

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A systematic series of model methanol synthesis catalysts was prepared by sequential impregnation of a mesoporous silica material (5 nm average pore size) with an organometallic ZnO precursor which is liquid at room temperature, followed by the infiltration with an aqueous Cu nitrate solution. These catalysts, which contained 14-20 wt.% Cu and 1-5 wt.% Zn, were characterized by N 2 O reactive chemisorption, by EXAFS and by measuring their methanol synthesis activities. It was observed that the formation of confined, nanocrystalline ZnO prior to copper infiltration is of major importance for the development of catalyst activity. Severe reduction of properly prepared catalysts (10% CO/H 2 , 673 K, 15 min) leads to the emergence of a new feature in the ZnK EXAFS spectrum which was assigned to a Cu neighbour by combined evidence from the ZnK EXAFS and XANES regions. The zinc oxide component was partially reduced as well, but Zn(0) was not formed to any significant extent. Catalysts which developed this Cu-Zn 2? interaction under severe reduction were superior in terms of methanol synthesis rate per m 2 Cu surface area to a sample which did not exhibit this feature.

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Section: Resultsmentioning

confidence: 99%

Dynamical Changes in the Cu–ZnO x Interaction Observed in a Model Methanol Synthesis Catalyst

et al. 2008

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“…The intensity of the main edge in the bulk ZnO XANES (i.e., around 9668 eV, as indicated by the vertical straight line) is greater than all nano samples; while all nano ZnO samples have almost same main peak intensity. The main peak in the XANES spectra is due to the electron transition from 1s to 4p, that is the lowest unoccupied energy level [8][9][10]. A lesser main peak intensity is corresponding to the decreasing cation coordination number [11] and it may result from a reduction in ZnO particle size [10].…”

Section: Methodsmentioning

confidence: 99%

“…The main peak in the XANES spectra is due to the electron transition from 1s to 4p, that is the lowest unoccupied energy level [8][9][10]. A lesser main peak intensity is corresponding to the decreasing cation coordination number [11] and it may result from a reduction in ZnO particle size [10]. The photon energy of the main peak from the ZnO-CN-50 1C XANES shifts to greater energy (i.e., approximately by +3.6 eV) as compared to all other XANES.…”

Section: Methodsmentioning

confidence: 99%

Characteristics of nano zinc oxide synthesized under ultrasonic condition

Wei

Chang

2008

Journal of Physics and Chemistry of Solids

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“…S-ZnO20 C-ZnO20 ZnO70 S-ZnO70 C-ZnO70 previously [23,24]. Although the overall XANES pattern of ZnO20 in the plasma condition (open circle in Fig.…”

Section: Zno20mentioning

confidence: 96%

Physico-chemical changes of ZnO nanoparticles with different size and surface chemistry under physiological pH conditions

Gwak

Lee

Paek

et al. 2015

Colloids and Surfaces B: Biointerfaces

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X-ray studies on optical and structural properties of ZnO nanostructured thin films

Cited by 38 publications

References 12 publications

Dynamical Changes in the Cu–ZnO x Interaction Observed in a Model Methanol Synthesis Catalyst

Dynamical Changes in the Cu–ZnO x Interaction Observed in a Model Methanol Synthesis Catalyst

Characteristics of nano zinc oxide synthesized under ultrasonic condition

Physico-chemical changes of ZnO nanoparticles with different size and surface chemistry under physiological pH conditions

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