Patterned Growth of Horizontal ZnO Nanowire Arrays

Xu, Sheng; Ding, Y.; Wei, Yaguang; Fang, Hao; Shen, Yue; Sood, Ashok K.; Polla, Dennis L.; Wang, Zhong Lin

doi:10.1021/ja902119h

Cited by 95 publications

(71 citation statements)

References 26 publications

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“…But in the wet chemical method, size expansion is always observed in both vertical and lateral directions when the nanowires are grown on pre-patterned substrates [48,280]. The width of the as-grown nanowires was found to be almost three times the size of the patterned openings.…”

Section: Electron Beam Lithographymentioning

confidence: 98%

“…An unprecedented strategy for patterned horizontal ZnO nanowire arrays was demonstrated by combing electron beam lithography and a solution growth method [280]. The basic principle is illustrated in Fig.…”

Section: Electron Beam Lithographymentioning

confidence: 99%

“…On a two-fold symmetry substrate, it will grow horizontally on the substrate. (b) A 60° tilt view of thick (top row) and thin (bottom row) ZnO nanowire arrays growing out of 2 μm by 400 nm and 2 μm by 200 nm openings, respectively [280]. (c) A 30° tilted view of the horizontal nanowire-array-based five-segment monolithic superstructures [56].…”

Section: Electron Beam Lithographymentioning

confidence: 99%

“…Due to the lateral expansion of the ZnO nanowires from the patterned areas [48,280], the actual contact area between the nanowire and the substrate is usually a fraction of the overall size of the nanowire, which enables easy cleavage at the interface without breaking the nanowires apart. In a typical pattern transfer process, a thin conformal layer of polymer was coated on the nanowires.…”

Section: Pattern Transfermentioning

confidence: 99%

“…ZnO nanowires have been used as active components in gas sensors [167,168,433], visible light sensors [434], visible-blind UV sensors [95,280,435], biosensors [94,436], and strain sensors [437]. These depend on the resistance or piezoresistance change of the nanowires [438], or the barrier height change at the contact [15-17, 437, 439], or are based on the heterostructured p-n diodes [434].…”

Section: Sensorsmentioning

confidence: 99%

See 4 more Smart Citations

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: Electron Beam Lithographymentioning

confidence: 98%

Section: Electron Beam Lithographymentioning

confidence: 99%

Section: Electron Beam Lithographymentioning

confidence: 99%

Section: Pattern Transfermentioning

confidence: 99%

Section: Sensorsmentioning

confidence: 99%

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One-dimensional ZnO nanostructures: Solution growth and functional properties

2011

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Growth and Transfer of Monolithic Horizontal ZnO Nanowire Superstructures onto Flexible Substrates

Shen

Ding

et al. 2010

Adv Funct Materials

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A method of fabricating horizontally aligned ZnO nanowire (NW) arrays with full control over the width and length is demonstrated. A cross‐sectional view of the NWs by transmission electron microscopy shows a “mushroom‐like” structure. Novel monolithic multisegment superstructures are fabricated by making use of the lateral overgrowth. Ultralong horizontal ZnO NWs of an aspect ratio on the order of ten thousand are also demonstrated. These horizontal NWs are lifted off and transferred onto a flexible polymer substrate, which may have many great applications in horizontal ZnO NW‐based nanosensor arrays, light‐emitting diodes, optical gratings, integrated circuit interconnects, and high‐output‐power alternating‐current nanogenerators.

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High‐Performance Integrated ZnO Nanowire UV Sensors on Rigid and Flexible Substrates

Bai

Qin

et al. 2011

Adv Funct Materials

312

203

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Due to the large surface area‐to‐volume ratio and high quality crystal structure, single nanowire (NW)‐based UV sensors exhibit very high on/off ratios between photoresponse current and dark current. Practical applications require a large‐scale and low‐cost integration, compatibility to flexible electronics, as well as reasonably high photoresponse current that can be detected without high‐precision measurement systems. In this paper, NW‐based UV sensors were fabricated in large‐scale by integrating multiple NWs connected in parallel via the contact printing method. Linear scaling of the photoresponse current with the number of NWs is demonstrated. Integrated ZnO NW UV sensors were fabricated on rigid glass and flexible polyester (PET) substrates at the macroscopic scale. The flexible and rigid sensors performed comparably, exhibiting on/off current ratios approximately three orders of magnitude higher than sensors made from polycrystalline ZnO thin films. Under UV irradiance of 4.5 mW cm−2 and 3 V bias, photoresponse currents and on/off current ratios for the rigid and flexible UV sensors reached 12.22 mA and 82 000, and 14.1 mA and 120 000, respectively. This result suggests that lateral integration of semiconductor NWs is an effective approach to large‐scale fabrication of flexible NW sensors that inherit the merits of single‐NW‐based systems with unaffected performance compared to using rigid substrate.

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Patterned Growth of Horizontal ZnO Nanowire Arrays

Cited by 95 publications

References 26 publications

One-dimensional ZnO nanostructures: Solution growth and functional properties

One-dimensional ZnO nanostructures: Solution growth and functional properties

Growth and Transfer of Monolithic Horizontal ZnO Nanowire Superstructures onto Flexible Substrates

High‐Performance Integrated ZnO Nanowire UV Sensors on Rigid and Flexible Substrates

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