Single-Crystalline ZnO Nanotube Arrays on Conductive Glass Substrates by Selective Disolution of Electrodeposited ZnO Nanorods

Xu, Longya; Liao, Qing; Zhang, Jianping; Ai, Xi-Cheng; Xu, Dongsheng

doi:10.1021/jp068485m

Cited by 110 publications

(92 citation statements)

References 37 publications

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“…1 It is obvious that 1D nanostructures of ZnO with a wide band gap ͑E g = 3.37 eV͒ and a large exciton binding energy ͑60 meV͒ have become important nanomaterials owing to their special properties and potential applications in nanoscale electric and optoelectronic devices. [1][2][3][4][5][6][7] During the past decade, different 1D ZnO nanostructures such as nanotubes, [8][9][10][11][12][13][14][15] nanowires, 1 nanorods, 16 nanobelts, 17,18 tetrapods, 19 and nanoribbons 20 have been successfully fabricated by different methods. Among these 1D structures, the tubular structures of ZnO become particularly important since numerous applications, such as dye-sensitized photovoltaic cells 21 and bio/ gas sensors, 22,23 are required their high porosity and large surface area to fulfill the demand for high efficiency and activity.…”

Section: Introductionmentioning

confidence: 99%

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Indirect optical transition due to surface band bending in ZnO nanotubes

Yang

Zhao

Israr

et al. 2010

Journal of Applied Physics

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ZnO nanotubes ͑ZNTs͒ have been successfully evolved from ZnO nanorods ͑ZNRs͒ by a simple chemical etching process. Two peaks located at 382 and 384 nm in the UV emission region has been observed in the room temperature photoluminescence ͑PL͒ spectrum of ZNTs since the surface band bending in ZNTs induces the coexistence of indirect and direct transitions in their emission process. In addition, a strong enhancement of total luminescence intensity at room temperature in ZNTs has also be observed in comparison with that of ZNRs. Both temperature-dependent PL and time-resolved PL results not only further testify the coexistence of indirect and direct transitions due to the surface band bending but also reveal that less nonradiative contribution to the emission process in ZNTs finally causes their stronger luminescence intensity.

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Section: Introductionmentioning

confidence: 99%

“…To date, ZnO nantubes has been synthesized by electrochemical method, [10][11][12] low temperature solution method, 8,9,13,14 vapor phase growth 15 and so on. As a common knowledge, the reproducibility and control of growth in synthesis of ZnO nanostructures are a major issue.…”

Section: Introductionmentioning

confidence: 99%

Indirect optical transition due to surface band bending in ZnO nanotubes

Yang

Zhao

Israr

et al. 2010

Journal of Applied Physics

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“…1c and inset to Fig. 1c 13,19 Core-shell structure and chemical composition of the nanorod arrays is confirmed through the energy filtered TEM images, as shown in Figs. 1e-1g.…”

Section: Resultsmentioning

confidence: 66%

A Cost-Effective and High-Performance Core-Shell-Nanorod-Based ZnO/α-Fe₂O₃//ZnO/C Asymmetric Supercapacitor

Sarkar

Das

Sharada

et al. 2017

J. Electrochem. Soc.

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A novel core-shell design for nano-structured electrode materials is introduced for realizing cost-effective and high-performance supercapacitors. In the proposed core-shell design, thin shell-layers of highly pseudo-capacitive materials provide the platform for surface or near-surface-based faradaic and non-faradaic reactions together with shortened ion-diffusion path facilitating fast-ion intercalation and deintercalation processes. The highly-conducting core serves as highway for fast electron transfer toward current collectors, improving both energy and power performance characteristics of the core-shell structure in relation to pristine component materials. Furthermore, use of carbon (C)-based materials as a shell layer in either electrode not only enhances capacitive performance through double-layer formation but also provides enough mechanical strength to sustain volume changes in the core material during long-cycling of the supercapacitor improving its cycle life. In order to enhance electrochemical performance in terms of specific capacitance and rate capability via core-shell architecture and nano-structuring, an asymmetric supercapacitor (ASC) is assembled using ZnO/α-Fe 2 O 3 and ZnO/C core-shell nanorods as respective negative and positive electrodes. The ASC exhibits a specific capacitance of ∼115 F/g at a scan rate of 10 mV/s in a potential window as large as 1.8 V with a response time as short as ∼39 ms and retains more than 80% of its initial capacitance after 4000 cycles. Interestingly, the ASC can deliver an energy density of ∼41 Wh/kg and a power density of ∼7 kW/kg that are significantly higher than those reported hitherto for iron-oxide-based ASCs. Global concern over ever increasing greenhouse gas emissions owing to exorbitant anthropogenic usage of fossil fuels is forcing governments across the globe to swing toward renewable energy sources. Since renewable sources of energy, like sun and wind, are intermittent in nature, it becomes mandatory to store the energy from these sources that could be retrieved on demand. Accordingly, the missing link in successful exploitation of renewable energy is its storage. 1Electrochemical storage of energy in storage-batteries is attractive but supercapacitors are gaining attention due to their compelling power densities as well as fast charge and discharge traits. 2,3 It is noteworthy that a battery is an energy device while a supercapacitor is a power device. If we require high power from a battery, we will generally extract less total energy than if we require low power. Supercapacitors can complement battery-power by allowing rapid charge and discharge cycles. Accordingly, supercapacitors complement batteries perfectly in the emerging energy-storage landscape and therefore the usage of a battery-supercapacitor hybrid structure is not only becoming increasingly common, but also inevitable.In the light of the foregoing, we have attempted to develop a high-performance asymmetric supercapacitor (ASC) using onedimensional (1-D) core-shell nanorods (NRs) e...

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“…[111] Single-crystalline ZnO nanotube arrays with an hexagonal wurtzite structure have been generated on glass substrates by a two-step solution approach. [112] The method involves the electrodeposition of oriented ZnO nanorods and subsequent coordination-assisted selective dissolution along the c-axis to form tubular structures caused by the preferential adsorption of ethylenediamine (EDA) and OH À on different crystal faces. After dissolution in aqueous EDA solution for 10-15 h, the inner/outer wall surfaces of the ZnO nanotubes become smooth with a wall thickness of $10-30 nm.…”

Section: Review Wwwadvmatdementioning

confidence: 99%

Synthesis of Inorganic Nanotubes

2009

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Nanotubes constitute an exciting class of one‐dimensional nanomaterials of which carbon nanotubes are recognized widely as materials of importance. The possibility of having inorganic nanotubes was recognized early in the 1990s, accompanied by the report of nanotubes of MoS2 and WS2. Since then, nanotubes of several inorganic materials have been prepared and characterized. While nanotubes of metal chalcogenides and oxides form a high proportion of the inorganic nanotubes investigated hither to, nanotubes of many other materials have also been prepared and characterized. Several synthetic strategies including both physical and chemical methods have been employed, of which the use of templates, precursors, and hydro‐ or solvothermal methods are prominent. In this article, we shall present a brief account of the present status of the synthesis of nanotubes of elemental materials as well as binary and complex metal oxides, chalcogenides, pnictides and carbides.

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Single-Crystalline ZnO Nanotube Arrays on Conductive Glass Substrates by Selective Disolution of Electrodeposited ZnO Nanorods

Cited by 110 publications

References 37 publications

Indirect optical transition due to surface band bending in ZnO nanotubes

Indirect optical transition due to surface band bending in ZnO nanotubes

A Cost-Effective and High-Performance Core-Shell-Nanorod-Based ZnO/α-Fe₂O₃//ZnO/C Asymmetric Supercapacitor

Synthesis of Inorganic Nanotubes

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Single-Crystalline ZnO Nanotube Arrays on Conductive Glass Substrates by Selective Disolution of Electrodeposited ZnO Nanorods

Cited by 110 publications

References 37 publications

Indirect optical transition due to surface band bending in ZnO nanotubes

Indirect optical transition due to surface band bending in ZnO nanotubes

A Cost-Effective and High-Performance Core-Shell-Nanorod-Based ZnO/α-Fe2O3//ZnO/C Asymmetric Supercapacitor

Synthesis of Inorganic Nanotubes

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A Cost-Effective and High-Performance Core-Shell-Nanorod-Based ZnO/α-Fe₂O₃//ZnO/C Asymmetric Supercapacitor