Structural and optical properties of ZnS/ZnO core/shell nanowires grown on ITO glass

Brayek, A.; Ghoul, Mohamed; Souissi, A.; Assaker, I. Ben; Lecoq, Hélène; Nowak, Sophie; Chaguetmi, Samiha; Ammar, Souad; Oueslati, M.; Chtourou, R.

doi:10.1016/j.matlet.2014.04.192

Cited by 28 publications

(23 citation statements)

References 33 publications

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“…The highest intensity corresponds to the (002) peak, suggesting the preferential growth orientation along the c-axis to the ITO surface with well-done crystalline quality. This result is in a complete agreement with those published in the literature [17,40]. To confirm all the previous DRX and SEM results, we proceed to UV-visible and spectroscopy Raman analyzes.…”

Section: Morphologysupporting

confidence: 90%

“…A two-step electrodeposition metod was used to fabricate the ZnO/Cu 2 O core-shell nanowires array onto ITO coated glass substrate. The substrate was cleaned sequentially, before deposition, under continuous bubbling of oxygen, using a classical three-electrode electrochemical cell [40,41]. Electrodeposition was carried out potentiostatically at -1.0 V versus Ag/AgCl using an Autolab PGSTAT30 potentiostat/galvanostat; the deposition time was 9000s and the reaction temperature was kept at 80°C [40].…”

Section: Samples Synthesismentioning

confidence: 99%

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Synthesis and characterization of ZnO/Cu2O core–shell nanowires grown by two-step electrodeposition method

Messaoudi

Makhlouf

Souissi

et al. 2015

Applied Surface Science

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Section: Morphologysupporting

confidence: 90%

Section: Samples Synthesismentioning

confidence: 99%

Synthesis and characterization of ZnO/Cu2O core–shell nanowires grown by two-step electrodeposition method

Messaoudi

Makhlouf

Souissi

et al. 2015

Applied Surface Science

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“…[10][11][12][13][14] In practice, ZnO rods are immersed in a concentrated aqueous solution of Na 2 S (typically 0.1-1.0 M) at room or moderate temperature (commonly #70 C) and stirred to allow ZnS shell growth for various contact times (usually 8-12 h). [10][11][12][13][14] The general ZnO to ZnS transformation scheme is assumed to be a progressive replacement of O 2À lattice anions by solvated S 2À ones, through a double ion-diffusion pathway: O 2À from the solid to the solution and reversely S 2À from the solution to the solid, where the general morphology of the starting ZnO particles is maintained. As a consequence, the longer the contact time (t c ) is, the thicker the formed ZnS shell becomes.…”

Section: -10mentioning

confidence: 99%

The structural and the photoelectrochemical properties of ZnO–ZnS/ITO 1D hetero-junctions prepared by tandem electrodeposition and surface sulfidation: on the material processing limits

et al. 2018

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ZnO-ZnS 1D hetero-nanostructures were prepared by an easy and scalable processing route. It consists of ZnO nanorod electrodeposition on ITO substrate and surface sulfidation by ion exchange in an aqueous Na 2 S solution. Increasing the treatment contact time (t c ) from 8 to 48 h involves different ZnS growth mechanisms leading to different structural and microstructural rod characteristics, even if the overall size does not change significantly. Grazing X-ray diffraction, high-resolution microscopy, energy-dispersive spectrometry and X-ray photoelectron spectroscopy describe the outer surface layer as a poly-and nanocrystalline ZnS blende shell whose thickness and roughness increase with t c . The ZnO wurtzite-ZnS blende interface goes from continuous and dense, at short t c , to discontinuous and porous at long t c , indicating that ZnS formation proceeds in a more complex way than a simple S 2À /O 2À ion exchange over the treatment time. This feature has significant consequences for the photoelectrochemical performance of these materials when they are used as photoanodes in a typical light-assisted water splitting experiment. A photocurrent (J p ) fluctuation of 45% for less than 5 min of operation is observed for the sample prepared with a long sulfidation time while it does not exceed 15% for that obtained with a short one, underlining the importance of the material processing conditions on the preparation of valuable photoanodes.

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“…[61][62][63] To highlight the capability of our methodology in evaluating the optical and transport properties of nanoscale systems, we have chosen as a prototypical example a coaxial core-shell (CCS) nanowire of ZnO and ZnS (see Fig. 4(b), left inner panel) that has been recently synthesized [64][65][66][67][68] .…”

Section: B Core-shell Nanowirementioning

confidence: 99%

Accurateab initiotight-binding Hamiltonians: Effective tools for electronic transport and optical spectroscopy from first principles

et al. 2016

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The calculations of electronic transport coefficients and optical properties require a very dense interpolation of the electronic band structure in reciprocal space that is computationally expensive and may have issues with band crossing and degeneracies. Capitalizing on a recently developed pseudo-atomic orbital projection technique, we exploit the exact tight-binding representation of the first principles electronic structure for the purposes of (1) providing an efficient strategy to explore the full band structure En(k), (2) computing the momentum operator differentiating directly the Hamiltonian, and (3) calculating the imaginary part of the dielectric function. This enables us to determine the Boltzmann transport coefficients and the optical properties within the independent particle approximation. In addition, the local nature of the tight-binding representation facilitates the calculation of the ballistic transport within the Landauer theory for systems with hundreds of atoms. In order to validate our approach we study the multi-valley band structure of CoSb3 and a large core-shell nanowire using the ACBN0 functional. In CoSb3 we point the many band minima contributing to the electronic transport that enhance the thermoelectric properties; for the core-shell nanowire we identify possible mechanisms for photo-current generation and justify the presence of protected transport channels in the wire.

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Structural and optical properties of ZnS/ZnO core/shell nanowires grown on ITO glass

Cited by 28 publications

References 33 publications

Synthesis and characterization of ZnO/Cu2O core–shell nanowires grown by two-step electrodeposition method

Synthesis and characterization of ZnO/Cu2O core–shell nanowires grown by two-step electrodeposition method

The structural and the photoelectrochemical properties of ZnO–ZnS/ITO 1D hetero-junctions prepared by tandem electrodeposition and surface sulfidation: on the material processing limits

Accurateab initiotight-binding Hamiltonians: Effective tools for electronic transport and optical spectroscopy from first principles

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