ZnO nanorods: synthesis, characterization and applications

Yi, Gyu‐Chul; Wang, Chunrui; Park, Won Il

doi:10.1088/0268-1242/20/4/003

Cited by 798 publications

(439 citation statements)

References 152 publications

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“…Multihierarchical electrode characterization SEM images of ZnONR ( Figure 1a) and ZnONR+gly films ( Figure S1) show that the rods have a hexagonal shape and their surface is very smooth which is consistent with described in the literature 9,[19][20][21][22][23] . The average diameters of the rods are 490 nm and 400 nm for the ZnONR and ZnONR+gly films, respectively.…”

Section: Resultssupporting

confidence: 86%

“…For this reason TiNTs have been used mostly as photocatalysts for water splitting in the powder form, as is shown in the upper part of Table 1. However, vertically aligned ZnO nanorod films can be easily obtained through several methods, such as hydrothermal synthesis, which is an inexpensive technique that requires low temperature, and the films can growth on several different surfaces without requiring metal catalysts 9,[19][20][21][22][23] . Thus, we propose the design of an electrode based on the TiNT and ZnONR materials on the nanascale, by developing a multiscale hierarchical electrode for efficient oxygen evolution via photoelectrochemical water splitting, which follows the [40][41][42] .…”

Section: Introductionmentioning

confidence: 99%

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Multihierarchical electrodes based on titanate nanotubes and zinc oxide nanorods for photoelectrochemical water splitting

et al. 2016

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a Studies involving water splitting to form hydrogen and oxygen have attracted attention because H2is considered the fuel of the future. Photoelectrocatalysts have been widely used for this application, and several metal oxides can be applied as catalysts. Among them, we highlight zinc oxide nanorods (ZnONRs) and titanate nanotubes (TiNTs); however, their individual nanostructures exhibit disadvantages. For example, ZnONR shows rapid recombination of the photogenerated charges, and TiNT gives rise to randomly orientated films; these disadvantages limit their application as photoanodes. In this study, for the first time, we present a new class of multihierarchical electrodes based on TiNT-decorated ZnONR films that exhibited superior results to the individual species. The TiNTs are homogenously dispersed over the surface of the rods without forming agglomerates, giving rise to a heterojunction that exhibits lower recombination rates. It was found that the results are better when the contents of TiNT in the electrode are higher; thus, glycine was successfully used as a bridge to link both of the structures, increasing the amount of TiNT decorating the rods. As a result, the photocurrent generated with these multihierarchical electrodes is higher than that obtained for pure ZnONR electrodes (0.9 mA and 0.45 mA, respectively), and the electrode potentials for O2 evolution is lower than that observed for pure TiNT electrodes (0 V and 0.8 V vs. ERHE, respectively). The IPCE values are also higher for the multihierarchical electrodes.

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Section: Resultssupporting

confidence: 86%

Section: Introductionmentioning

confidence: 99%

Multihierarchical electrodes based on titanate nanotubes and zinc oxide nanorods for photoelectrochemical water splitting

et al. 2016

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“…Nanostructures of ZnO such as ZnO nanorods and nanowires have received increased attention due to their excellent electrical and optical properties [3]. Due to the high surface-to-volume ratio provided by the one-dimensional (1D) nanostructure, ZnO nanorod arrays are considered suitable to the application for hybrid photovoltaic devices [4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Growth of ZnO Nanorod Arrays on Flexible Substrates: Effect of Precursor Solution Concentration

et al. 2012

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We report a low-temperature aqueous solution growth of uniformly aligned ZnO nanorod arrays on flexible substrates. The substrate is Indium Tin Oxide (ITO) film coated on polyethylene terephthalate (PET). Solutions with five different concentrations of the precursors with equimolar Zinc Nitrate and Hexamethylenetetramine (HMT) in distilled water were prepared to systematically study the effect of precursor solution concentration on the structural and optical properties of ZnO nanorods. It was concluded that the precursor concentration have great influence on the morphology, crystal quality, and optical property of ZnO nanorods. The diameter, density, and orientation of the nanorods are dependent on the precursor solution concentration. X-ray diffraction and micro-Raman spectroscopy showed that the ZnO nanorods with the highest concentration of 50 mM were highly aligned and have the highest level of surface coverage. It was also found that the diameter and length of the nanorods increases upon increasing precursor solution concentration. This is the first systematic investigation of studying the effect of precursor solution concentration on the quality of ZnO nanorods grown on ITO/PET substrates by low-temperature solution method. We believe that our work will contribute to the realization of flexible organic-inorganic hybrid solar cell based on ZnO nanorods and conjugated polymer.

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“…Thus, ZnO microand nanostructures have great potential applications in fields of electronic, photonic, spintronic, and sensing devices. 1)-4) Until now, ZnO micro-and nanostructures with various morphologies such as wire, 5) rod, 6) belt, 7) tube, 8) comb, 9) and tetrapod 10) have been synthesized by many physical based and wet-chemical/ solution based methods.…”

Section: Introductionmentioning

confidence: 99%

Change in the morphology of ZnO crystals by thermal evaporation method using a mixture of ZnS and graphite

Lee

2017

J. Ceram. Soc. Japan

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One dimensional rod-shaped and two dimensional twin-crystal shaped ZnO crystals were fabricated by thermal evaporation of a mixture of ZnS and graphite powders in air at atmospheric pressure. Twin-crystal shaped ZnO crystals were formed at 1050°C, while rod-shaped ZnO crystals were synthesized at 1150°C. The morphology of ZnO crystals was drastically changed according to the growth temperature. It is particularly interesting that two hexagonal plates formed a twin crystal, in which hexagonal shaped ZnO plates were symmetrically grown on both sides of a mirror-like plane. The twin crystal looked like a yo-yo. X-ray diffraction analysis showed that the rod and twin-crystal shaped ZnO crystals exhibited a wurtzite crystallographic structure. A strong green emission peak at 500 nm was observed in the cathodoluminescence spectra of the ZnO crystals at room temperature.

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ZnO nanorods: synthesis, characterization and applications

Cited by 798 publications

References 152 publications

Multihierarchical electrodes based on titanate nanotubes and zinc oxide nanorods for photoelectrochemical water splitting

Multihierarchical electrodes based on titanate nanotubes and zinc oxide nanorods for photoelectrochemical water splitting

Growth of ZnO Nanorod Arrays on Flexible Substrates: Effect of Precursor Solution Concentration

Change in the morphology of ZnO crystals by thermal evaporation method using a mixture of ZnS and graphite

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