Raman scattering in Me-doped ZnO nanorods (Me = Mn, Co, Cu and Ni) prepared by thermal diffusion

Phan, T. L.; Vincent, R.; Cherns, D.; Nghia, Nguyen Xuan; Ursaki, V. V.

doi:10.1088/0957-4484/19/47/475702

Cited by 86 publications

(66 citation statements)

References 52 publications

(140 reference statements)

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“…The G band originates from in-plane vibration of sp 2 carbon atoms is a doubly degenerate (TO and LO) phonon mode (E 2g symmetry) at the Brillouin zone center (Phan et al, 2008). The 2D band originates from a two phonon double resonance Raman process (Djurisic and Leung, 2006).…”

Section: Structural and Optical Resultsmentioning

confidence: 99%

Growth of Single-sided ZnO nanocombs/ML graphene Heterostructures

Al-Ruqeishi

Mohiuddin

2019

Arabian Journal of Chemistry

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We report catalyst-free growth of high-density single-sided ZnO nanocombs for the first time on a multi-layer graphene (MLG). Structural analysis based on scanning electron microscope reveals the nanocomb ribbon average diameter and length are about 90-600 nm and 5-60 lm, respectively, while the diameter and length of the comb tooth are about 30-100 nm and 100-700 nm respectively. In general, the length of the teeth decreases gradually from one end of the nanocomb ribbon to another. ZnO crystal growth seems to involve two steps which are the formation of Zn buffer layer/graphene, which works as growth nucleation sites and long nanowires ends with nanocombs structure. Raman and PL optical transitions prove the well-faceted hexagonal structure of ZnO nanocombs as well as the existence of defects such as O vacancies and Zn interstitials. Graphene-based inorganic hybrid nanostructures provide several potential applications in optoelectronics and nanoscale electronics such as nanogenerators, photovoltaic devices, optical devices, and photodetectors. ª 2015 The Authors. Production and hosting by Elsevier B.V. on behalf of King Saud University. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).

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Section: Structural and Optical Resultsmentioning

confidence: 99%

Growth of Single-sided ZnO nanocombs/ML graphene Heterostructures

Al-Ruqeishi

Mohiuddin

2019

Arabian Journal of Chemistry

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“…In the undoped ZnO sample, the peaks at 331, 384, and 584 cm −1 correspond to the second-order acoustic (2-E 2 (M)) mode, A 1 transverse optical (A 1 (TO)) mode, and E 1 longitudinal optical (E 1 (LO)) mode, respectively [30]. The sharp and strong peak at around 437 cm −1 can be attributed to the high-frequency branch of the E 2 (E 2 (high)) mode of ZnO, which is the strongest, and typical Raman-active branch of the wurtzite crystal structure [31]. In the Zn 1− x Cu x O nanostructures, the presence of the E 2 (high) mode confirms that they all have a typical hexagonal wurtzite structure, which is consistent with the above HRTEM and XRD observations.…”

Section: Resultsmentioning

confidence: 99%

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

2013

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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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“…From Figure 4 one observes the effects of Cu-doping on the E 2 (high) mode of ZnO since its intensity decreases. The Raman spectrum indicates a shift in signal at ∼ 437 cm −1 for Cu-doped ZnO, which was observed in ZnO:Cu grown by other techniques [6,[14][15][16].…”

Section: Experimental Details On Hydrothermal Growth Of Doped Zno Nanmentioning

confidence: 56%

Synthesis and gas sensor applications of nanostructured ZnO grown at low temperatures

Lupan¹,

Pauporté²,

Chow³

2014

Turk J Phys

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ZnO nanoarchitecture-based nano-and microdevices came into the focus due to their multifunctional operation. In this work, we summarize cost-effective procedures to grow ZnO nano-and microstructures, namely hydrothermal growth and electrochemical deposition. These techniques allow the controllable growth of ZnO nano-and microarchitectures at relatively low temperatures, below 100• C, and do not require sophisticated equipment. We report on technological details for synthesis of ZnO and its characterization and applications in different novel devices such as gas sensors. Nanosensors and microsensors were fabricated using a focused ion beam and by metal welding an individual nano-and microstructure to form rigid contacts. Devices made from pure and doped ZnO nanostructures are presented and discussed. Developed nano-and microdevice structures show promising performances and are quite attractive for further investigations in sensor applications. Several factors determine the gas sensing mechanism of pure and dopedZnO micro-and nanowire/nanorods and discussions on this are summarized.

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Raman scattering in Me-doped ZnO nanorods (Me = Mn, Co, Cu and Ni) prepared by thermal diffusion

Cited by 86 publications

References 52 publications

Growth of Single-sided ZnO nanocombs/ML graphene Heterostructures

Growth of Single-sided ZnO nanocombs/ML graphene Heterostructures

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

Synthesis and gas sensor applications of nanostructured ZnO grown at low temperatures

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