Formation of one-dimensional ZnO nanowires from screw-dislocation-driven two-dimensional hexagonal stacking on diamond substrate using nanoparticle-assisted pulsed laser deposition
TL;DR: In this article, the growth of 1D ZnO nanowires on a p-type diamond substrate using nanoparticle-assisted pulsed laser deposition technique was reported, and the growth velocities at different regions of the hexagons were analyzed.
Abstract: We report on the growth of ZnO nanowires on a p-type diamond substrate using nanoparticle-assisted pulsed laser deposition technique. Microstructural analysis on different growth stages reveals that the self-assembled 1D ZnO nanowires emerge on well-formed 2D hexagonal base with spiral-like structures. We explain the formation of screw-dislocation-driven spiral-like-hexagons invoking crystal growth velocities at different regions of the hexagons. High-resolution transmission electron microscopy and selective area electron diffraction studies show that the nanowires are single crystalline in nature and grow along 〈0 0 0 1〉 direction of the wurtzite hexagonal structure. Room temperature photoluminescence spectrum of the ZnO nanowire shows a strong near band edge emission at 3.2 eV with a linewidth of 136 meV.
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TL;DR: In this paper, the hexagonal frustum end of ZnO nano-arrays/rods changed into a pyramid and the diameter of the nano-drone decreased gradually with the increasing etching time.
Abstract: The well-aligned ZnO nano-arrays/rods synthesized by a chemical bath deposition method on a highly conductive Si substrate were chemically etched in an ammonia chloride aqueous solution. An obvious end shape modification of ZnO nano-arrays/rods was realized in this report. The hexagonal frustum end of ZnO nano-arrays/rods changed into a pyramid and the diameter of ZnO nano-arrays/rods decreased gradually with the increasing etching time. The evolution mechanism of the wet etching process was discussed based on a proposed evolution model. Photoluminescence measurements indicated that the near band edge emissions of ZnO nano-arrays/rods increased greatly after wet etching. The controllable end shape modification of ZnO nano-arrays/rods on a highly conductive Si substrate by this simple wet etching technique will further explore the application of ZnO in field emission devices and 1D based nano-devices with various end shapes.
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TL;DR: In this article, the structural and optical properties of nanoparticle-assisted pulsed laser-deposited ZnO microrods and Au-coated ZnOs grown on Si substrate were investigated.
Abstract: We investigated the structural and optical properties of nanoparticle-assisted pulsed laser-deposited ZnO microrods and Au-coated ZnO microrods grown on Si substrate. Our present study indicates that Au-coated ZnO microrods exhibit whispering gallery modes (WGM) in the near band edge region with significant splitting into two branches. Moreover, the WGMs exhibited blue shift with decrease in rod size. We found that the modes are well split in Au coated ZnO rods when compared with as-grown rods, resulted from the plasmon enhancement of WGM modes. We also found that the Au-coated ZnO was stable in the ambient when compared with uncoated ZnO. WGM resonance from the exciton related emission, the enhancement in WGMs, and stability in the ambient condition of the Au-coated ZnO microrods suggest great potential for small-volume devices and microlasers.
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TL;DR: In this paper, a survey of recent developments in the rational synthesis of single-crystalline zinc oxide nanowires and their unique optical properties is presented, based on the fundamental understanding of the vapor-liquid-solid (VLS) nanowire growth mechanism, different levels of growth controls have been achieved.
Abstract: This article surveys recent developments in the rational synthesis of single-crystalline zinc oxide nanowires and their unique optical properties. The growth of ZnO nanowires was carried out in a simple chemical vapor transport and condensation (CVTC) system. Based on our fundamental understanding of the vapor–liquid–solid (VLS) nanowire growth mechanism, different levels of growth controls (including positional, orientational, diameter, and density control) have been achieved. Power-dependent emission has been examined and lasing action was observed in these ZnO nanowires when the excitation intensity exceeds a threshold (∼40 kW cm–2). These short-wavelength nanolasers operate at room temperature and the areal density of these nanolasers on substrate readily reaches 1 × 1010 cm–2. The observation of lasing action in these nanowire arrays without any fabricated mirrors indicates these single-crystalline, well-facetted nanowires can function as self-contained optical resonance cavities. This argument is further supported by our recent near-field scanning optical microscopy (NSOM) studies on single nanowires.
1,769 citations
TL;DR: The visible Raman spectra of poor quality chemical-vapor-deposited diamond is often used as the signature of nanocrystalline diamond as mentioned in this paper, which is not the case for sp-bonded diamond.
Abstract: The peak near 1150 cm 21 in the visible Raman spectra of poor quality chemical-vapor-deposited diamond is often used as the signature of nanocrystalline diamond. We argue that this peak should not be assigned to nanocrystalline diamond or other sp-bonded phases. Its wave number disperses with excitation energy, its intensity decreases with increasing excitation energy, and it is always accompanied by another peak near 1450 cm, which acts similarly. This behavior is that expected for sp-bonded configurations, with their smaller band gap. The peaks are assigned to transpolyacetylene segments at grain boundaries and surfaces.
1,115 citations
TL;DR: This paper presents direct growth of Aligned Zinc Oxide Nanorods on Paper Substrates for Low-Cost Flexible Electronics, which make excellent alternative substrates with exceptional technological attributes and commercial perspectives for the many substrates available.
Abstract: www.MaterialsViews.com C O M M U Direct Growth of Aligned Zinc Oxide Nanorods on Paper Substrates for Low-Cost Flexible Electronics N IC A By Afsal Manekkathodi , Ming-Yen Lu , Chun Wen Wang , and Lih-Juann Chen * IO N Contemporary science and technology are hoping to revolutionize modern society with soft portable electronic devices, such as rollup displays, wearable devices, electronic paper, chip smart cards, and basic components in various devices. Research is actively focused on using paper or paper-like substrates for basic electronics components, which make excellent alternative substrates with exceptional technological attributes and commercial perspectives for the many substrates available. [ 1–10 ] The innovative techniques and strategies that are required for these fl exible paper-like platforms are just beginning to emerge from research laboratories in the form of realistic prototypes and have yet to be commercialized. Various electronic devices have already been realized, such as electronic paper displays (EPDs), [ 2 ] printed circuit boards, [ 3 ] thin fi lm transistors (TFTs), [ 4 – 6 ] active-matrix organic light-emitting diodes (AMOLEDs), [ 7 ] paper batteries, [ 8 ]
354 citations
TL;DR: This paper reviews the recent progress in the preparation of oxide-based and heteroatom-doped particles, which are functionalized with organic molecules or doped with heteroatoms, the physicochemical properties of the particles and the possibilities for their photofunctional applications as complex systems.
317 citations