Controlled synthesis of oriented single-crystal ZnO nanotube arrays on transparent conductive substrates

She, Guangwei; Zhang, Shun; Shi, Wensheng; Fan, Xiaowu; Chang, Jie; Lee, Chun‐Sing; Lee, Shuit‐Tong; Liu, Changhong

doi:10.1063/1.2842386

Cited by 182 publications

(91 citation statements)

References 15 publications

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“…As discussed previously, the polar surfaces will be dissolved preferentially since this decreases the system energy during the subsequent aging process, and that gradually leads to the formation of ZnO nanotubes [183,185], as illustrated in Fig. 14 [186]. In a further step, ZnO rings could also be synthesized by the growth of plates and a subsequent etching process [187].…”

Section: Tubes/ringsmentioning

confidence: 96%

One-dimensional ZnO nanostructures: Solution growth and functional properties

2011

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One-dimensional (1D) ZnO nanostructures have been studied intensively and extensively over the last decade not only for their remarkable chemical and physical properties, but also for their current and future diverse technological applications. This article gives a comprehensive overview of the progress that has been made within the context of 1D ZnO nanostructures synthesized via wet chemical methods. We will cover the synthetic methodologies and corresponding growth mechanisms, different structures, doping and alloying, positioncontrolled growth on substrates, and finally, their functional properties as catalysts, hydrophobic surfaces, sensors, and in nanoelectronic, optical, optoelectronic, and energy harvesting devices.

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Section: Tubes/ringsmentioning

confidence: 96%

One-dimensional ZnO nanostructures: Solution growth and functional properties

2011

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“…23 It was found that the concentration of KOH has a strong effect on the dissolution rate and that a concentration of 0.25 mol.L −1 resulted in the degradation of the lateral walls but does not influence the mechanism. She et al 28 report that the process of formation of nanotubes is similar in acidic (0.001 M HCl) and alkaline (0.125 M KOH) media.…”

Section: Introductionmentioning

confidence: 99%

“…23 When selective dissolution has been observed, two suggested mechanisms have been reported. The etching can happen either from the side 22,23,29 or the center 21,[26][27][28] of the top surface leading to the formation of tubes with a conical or rectangular tip respectively. It is currently not well-understood what controls the dissolution mechanism; 27 one of the main reasons is that the dissolution mechanism has only been studied by ex-situ characterization methods that gave poor insight into the kinetics of the process.…”

Section: Introductionmentioning

confidence: 99%

“…23,27,28 Elias et al 27 have investigated the influence of Cl − concentration and temperature on ZnO nanotube formation by ex-situ SEM characterization. They found that the dissolution of the nanorod core occurs for concentrations of Cl − ≥ 1 M and the dissolution rate increases with the temperature but these two parameters do not change the mechanism.…”

Section: Introductionmentioning

confidence: 99%

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Understanding the Selective Etching of Electrodeposited ZnO Nanorods

et al. 2014

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ZnO nanotubes were prepared by selective dissolution of electrodeposited nanorods. The effect of solution pH, rod morphology and chloride ion concentration on the dissolution mechanism were studied. The selective etching was rationalized in terms of the surface energy of the different ZnO crystal faces and reactant diffusion. The nanorod diameter and chloride concentration are the most influential parameters on the dissolution mechanism because they control homogenous dissolution or selective etching of the (110) and (002) surfaces. Bulk solution pH only has an effect on the rate of dissolution. By accurate control of the dissolution process, the nanomorphology can be tailored and the formation of rods with a thin diameter (10-20 nm), cavity or ultra-thin-walled tubes (2-5 nm) can be achieved.

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“…By controlling the parameters during the synthesis process, ZnO can be synthesized in a broad variety of morphologies, such as nanotetrapods [33], nanotubes [34], or nanowires [35]. Among these nanostructures, the nanotetrapods have attracted significant attention due to their unique morphology consisting of four legs connected together in a tetrahedral symmetry.…”

Section: Synthesismentioning

confidence: 99%

Evaluation of zinc oxide nano-microtetrapods for biomolecule sensing applications

Zhao

Karlsson³

et al. 2015

SPIE Proceedings

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Zinc oxide (ZnO) is a well-known II-VI semiconductor material that has gained renewed interest in the past decade due to the developments of growth technologies and the availability of high-quality ZnO bulk single crystals. Owing to a wide direct band gap (3.37 eV), large exciton binding energy (60 meV), and high electron mobility (440 cm 2 V -1 s -1 ),ZnO has been used for applications including actuators, optoelectronics, and sensors. ZnO nanoparticles can be synthesized in a broad variety of morphologies, such as nanotetrapods, nanotubes, and nanowires. Among these nanostructures, the tetrapods have attracted significant attention due to their unique morphology consisting of four legs connected together in a tetrahedral symmetry. Recently, it has been reported that nano-microstructuredZnO tetrapods (ZnO-Ts) can be synthesized by flame transport synthesis (FTS) in a rapid and up-scalable approach. Compared to conventional ZnO nanoparticles, the nanomicrostructured ZnO-Ts can reduce cellular uptake, while still exhibiting specific nanomaterial properties due to the nanoscale tips. Moreover, the anisotropic ZnO-Ts have the advantages of multiple electron transfer paths, chemical stability, and biocompatibility, which make the ZnO-Ts promising candidates for biomolecule sensing applications.This work herein reports a systematical study on the structural, optical and electrochemical properties of the ZnO-Ts, which were synthesized by FTS using precursor Zn microparticles. The morphology of the ZnO-Ts was confirmed by scanning electron microscopy (SEM) as joint structures of four single crystalline legs, of which the diameter of each leg is 0.7-2.2 μm in average from the tip to the stem. The ZnO-Ts were dispersed in glucose solutions to study the photoluminescence as well as photocatalytic activity in a mimicked biological environment. The photoluminescence (PL) intensity in the ultraviolet (UV) region decreased with linear dependence on the glucose concentration up to 4 mM.The ZnO-Ts were also attached with glucose oxidase (GOx) and over coated with Nafion ® to form the active media for electrochemical glucose sensing. The active layers were confirmed by Fourier transform infrared spectroscopy (FT-IR). Furthermore, the current response of the active layers to glucose was studied by cyclic voltammetry (CV) in various glucose concentration conditions. Stable current response to glucose was detected with linear dependence on the glucose concentration up to 12 mM, which confirms the potential of ZnO-Ts for biomolecule sensing applications.

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Controlled synthesis of oriented single-crystal ZnO nanotube arrays on transparent conductive substrates

Cited by 182 publications

References 15 publications

One-dimensional ZnO nanostructures: Solution growth and functional properties

One-dimensional ZnO nanostructures: Solution growth and functional properties

Understanding the Selective Etching of Electrodeposited ZnO Nanorods

Evaluation of zinc oxide nano-microtetrapods for biomolecule sensing applications

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