Synergism of oxygen vacancy and carbonaceous species on enhanced photocatalytic activity of electrospun ZnO-carbon nanofibers: Charge carrier scavengers mechanism

Samadi, Morasae; Shivaee, Hossein Asghari; Pourjavadi, Ali; Moshfegh, A.Z.

doi:10.1016/j.apcata.2013.06.024

Cited by 94 publications

(41 citation statements)

References 45 publications

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“…However, for sample MS, the reflectance gives a sharp jump at the wavelengths between 360 and 400 nm and is 2 to 3 times larger than that of sample ALD in visible region. The optical bandgap estimated from the jump with Tauc model [32] is about 388 nm, which agrees well with the result of PL spectra in Fig. 5, as both are due to the electron transition from the valence band to the conduction band of ZnO.…”

Section: Resultssupporting

confidence: 87%

“…The first peak at 388 nm corresponds to the band edge luminescence of ZnO crystal [31], which is red-shifted from the bandgap of bulk ZnO (368 nm, 3.37 eV). The reason may be multifold, including the Si component in the hybrid nanostructure, the growing method with especial reagents, and the existence of oxygen vacancy in ZnO nanowires [32] and carbon species as established in EDS spectra. The bandgap reduction suggests that the arrays can absorb much light in a far wider wavelength, which is favorable for photocatalytic and photoelectric performances.…”

Section: Resultsmentioning

confidence: 99%

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Synthesis of ZnO/Si Hierarchical Nanowire Arrays for Photocatalyst Application

Yan

Lin

et al. 2017

Nanoscale Res Lett

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ZnO/Si nanowire arrays with hierarchical architecture were synthesized by solution method with ZnO seed layer grown by atomic layer deposition and magnetron sputtering, respectively. The photocatalytic activity of the as-grown tree-like arrays was evaluated by the degradation of methylene blue under ultraviolet light at ambient temperature. The comparison of morphology, crystal structure, optical properties, and photocatalysis efficiency of the two samples in different seeding processes was conducted. It was found that the ZnO/Si nanowire arrays presented a larger surface area with better crystalline and more uniform ZnO branches on the whole sidewall of Si backbones for the seed layer by atomic layer deposition, which gained a strong light absorption as high as 98% in the ultraviolet and visible range. The samples were proven to have a potential use in photocatalyst, but suffered from photodissolution and memory effect. The mechanism of the photocatalysis was analyzed, and the stability and recycling ability were also evaluated and enhanced.Electronic supplementary materialThe online version of this article (doi:10.1186/s11671-016-1803-0) contains supplementary material, which is available to authorized users.

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Section: Resultssupporting

confidence: 87%

Section: Resultsmentioning

confidence: 99%

Synthesis of ZnO/Si Hierarchical Nanowire Arrays for Photocatalyst Application

Yan

Lin

et al. 2017

Nanoscale Res Lett

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“…The shift is in line with the transfer of electrons to the neighboring oxygen vacancies. In our case, NaBH 4 treatment is an effective method to introduce surface defect (oxygen vacancy) into ZnO NARs[34,35].…”

mentioning

confidence: 98%

Effect of oxygen vacancy on enhanced photocatalytic activity of reduced ZnO nanorod arrays

Wang

et al. 2015

Applied Surface Science

140

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“…Carbon prefers to bind to oxygen ions, and C-O-Zn bonds are energetically more favorable, in this way carbon species are stabilized by excess electrons brought by a lattice oxygen vacancy, (see Fig. 5c) [18]. To build the wires-like ZnO structures, atomic or clustering interactions are necessary as well as the thermodynamic driving force to organize those atoms or clusters to form nanosized patterns [19].…”

Section: Scanning Electronic Microscopymentioning

confidence: 98%