A molecular approach to Cu doped ZnO nanorods with tunable dopant content

Pashchanka, Mikhail; Hoffmann, Rudolf C.; Gurlo, Aleksander; Swarbrick, Janine C.; Khanderi, Jayaprakash; Engstler, Jörg; Issanin, Alexander; Schneider, Jörg J.

doi:10.1039/c0dt01567a

Cited by 39 publications

(19 citation statements)

References 43 publications

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“…These new phases in the XRD spectrum correspond to CuO (matched with JCPDS No. 01–1117), owing to the fact that the solubility of Cu ions in ZnO is quite low [12]. Moreover, it is noted that with the increase of Cu content, these CuO diffraction peaks become more obvious and stronger.…”

Section: Resultsmentioning

confidence: 99%

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Catalyst-free direct vapor-phase growth of Zn1−xCu x O micro-cross structures and their optical properties

Fan

Shen

2013

Nanoscale Res Lett

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We report a simple catalyst-free vapor-phase method to fabricate Zn1−xCuxO micro-cross structures. Through a series of controlled experiments by changing the location of the substrate and reaction time, we have realized the continuous evolution of product morphology from nanorods into brush-like structures and micro-cross structures at different positions, together with the epitaxial growth of branched nanorods from the central stem with the time extended. The growth mechanism of the Zn1−xCuxO micro-cross structures has been proposed to involve the synthesis of Cu/Zn square-like core, surface oxidation, and the secondary growth of nanorod arrays. By the detailed structural analysis of the yielded Zn1−xCuxO samples at different locations, we have shown that the CuO phases were gradually formed in Zn1−xCuxO, which is significant to induce the usual ZnO hexagonal structures changing into four-folded symmetrical hierarchical micro-cross structures. Furthermore, the visible luminescence can be greatly enhanced by the introduction of Cu, and the observed inhomogeneous cathode luminescence in an individual micro-cross structure is caused by the different distributions of Cu.

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Section: Resultsmentioning

confidence: 99%

“…Copper, considered as a valuable dopant for the achievement of long-searched-for p-type ZnO [12], can serve not only as a luminescence activator but also as a compensator of ZnO [13]. In addition, Cu doping, leading to form donor-acceptor complexes, can induce a polaron-type ferromagnetic order in ZnO [14,15].…”

Section: Introductionmentioning

confidence: 99%

Catalyst-free direct vapor-phase growth of Zn1−xCu x O micro-cross structures and their optical properties

Fan

Shen

2013

Nanoscale Res Lett

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“…Relatively broad peaks centered at 350 and 550 cm −1 in the fingerprint region of ZnO were found in the ATR FTIR spectra of both undoped and Cu-doped ZnO NRs in Figure 3 B. These peaks are associated with Zn–O stretching [ 38 , 39 , 40 ]. No additional absorption peaks were identified from the Cu-doped ZnO NRs.…”

Section: Resultsmentioning

confidence: 99%

Spatially Correlated, Single Nanomaterial-Level Structural and Optical Profiling of Cu-Doped ZnO Nanorods Synthesized via Multifunctional Silicides

et al. 2018

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We demonstrate a straightforward and effective method to synthesize vertically oriented, Cu-doped ZnO nanorods (NRs) using a novel multipurpose platform of copper silicide nanoblocks (Cu3Si NBs) preformed laterally in well-defined directions on Si. The use of the surface-organized Cu3Si NBs for ZnO NR growth successfully results in densely assembled Cu-doped ZnO NRs on each NB platform, whose overall structures resemble thick bristles on a brush head. We show that Cu3Si NBs can uniquely serve as a catalyst for ZnO NRs, a local dopant source of Cu, and a prepatterned guide to aid the local assembly of the NRs on the growth substrate. We also ascertain the crystalline structures, optical properties, and spectroscopic signatures of the Cu-doped ZnO NRs produced on the NBs, both at each module of NRs/NB and at their ensemble level. Subsequently, we determine their augmented properties relative to the pristine form of undoped ZnO NRs and the source material of Cu3Si NBs. We provide spatially correlated structural and optical data for individual modules of Cu-doped ZnO NRs assembled on a Cu3Si NB by resolving them along the different positions on the NB. Ensemble-averaged versus individual behaviors of Cu-doped ZnO NRs on Cu3Si NBs are then compared. We further discuss the potential impact of such ZnO-derived NRs on their relatively unexplored biological and biomedical applications. Our efforts will be particularly useful when exploiting each integrated module of self-aligned, Cu-doped ZnO NRs on a NB as a discretely addressable, active element in solid-state sensors and miniaturized luminescent bioprobes.

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“…8d. The peak centered at 933.14 eV is attributed to Cu 2p 3/2 , whereas the peak at 953.74 eV is ascribed to Cu 2p 1/2 , indicating the existence of copper with the +2 oxidation state [47,48]. Figure 9 shows a comparison of the UV-Vis diffuse reflection spectrum of ZnO and 1 wt% Cu/ZnO.…”

Section: Xps Analysismentioning

confidence: 99%

Enhanced photocatalytic reduction of toxic Cr(VI) with Cu modified ZnO nanoparticles in presence of EDTA under UV illumination

et al. 2019

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In this study, the photocatalytic reduction of Cr(VI) to Cr(III) in aqueous solution using 1 wt% Cu/ZnO photocatalyst in presence of ethylenediaminetetraacetic acid (EDTA) under UV irradiation was investigated. The photocatalytic Cr(VI) reduction with ZnO under UV irradiation was significantly low. A fast Cr(VI) reduction with ZnO was recorded in presence of EDTA. Results demonstrated that the rate constant raised from 1.6 × 10 −2 to 7.5 × 10 −2 min −1 with 20 ppm EDTA addition. The optimum reduction (90%) was observed within 30 min at pH 3. The reduction efficiency of Cr(VI) was evidently increased from 6% to 99%, with increasing ZnO dosages up to 40 mg. The role of co-catalysts such as Au, Ag, Cu and NiO was also studied. The addition of Cu ion remarkably accelerated the reduction of Cr(VI), compared with ZnO/ EDTA system alone. The Cu motivated ZnO/EDTA system completed the 99% reduction within only 30 min. The Cu ions were reduced to metallic copper and Cu 2 O by conduction band electrons of ZnO. The electron-hole recombination was gently declined by the shallow electron trapping of Cu. On the other hand, EDTA could be performed in two ways by forming Cr(III)-complex and separating Cr(III) from ZnO surface and by consuming valence band holes. The Cu modified ZnO photocatalyst was characterized by N 2 adsorption-desorption isotherm, TEM, EDX, XPS, DRS and PL spectra. We evaluated the influence of pH, photocatalyst dosage, initial concentration of EDTA and initial concentration of Cu 2+ ion (Cu doping amount) on photocatalytic reduction of Cr(VI). The pseudo first order kinetic reaction was confirmed for this reduction process. Herein, a probable mechanism of this photocatalytic reduction process was also presented.

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A molecular approach to Cu doped ZnO nanorods with tunable dopant content

Cited by 39 publications

References 43 publications

Catalyst-free direct vapor-phase growth of Zn1−xCu x O micro-cross structures and their optical properties

Catalyst-free direct vapor-phase growth of Zn1−xCu x O micro-cross structures and their optical properties

Spatially Correlated, Single Nanomaterial-Level Structural and Optical Profiling of Cu-Doped ZnO Nanorods Synthesized via Multifunctional Silicides

Enhanced photocatalytic reduction of toxic Cr(VI) with Cu modified ZnO nanoparticles in presence of EDTA under UV illumination

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