Large-Scale Hexagonal-Patterned Growth of Aligned ZnO Nanorods for Nano-optoelectronics and Nanosensor Arrays

Wang, Xudong; Summers, Christopher J.; Wang, Zhong Lin

doi:10.1021/nl035102c

Cited by 1,520 publications

(983 citation statements)

References 15 publications

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“…102 Furthermore, NSL has been used to create templates for the directed growth or attachment of other materials. For example, periodic arrays of quantum dots, 103 aligned carbon nanotubes, 104 and aligned zinc oxide nanorods 105 have all been produced using templates fabricated by NSL. Thus, numerous nanomaterials may be precisely fabricated by NSL for controlled studies of their unique properties.…”

Section: Nanosphere Lithographymentioning

confidence: 99%

Controlled Evaluation of Silver Nanoparticle Dissolution Using Atomic Force Microscopy

Kent

Vikesland

2012

Environ. Sci. Technol.

127

129

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Incorporation of silver nanoparticles (AgNPs) into an increasing number of consumer products has led to concern over the potential ecological impacts of their unintended release to the environment. Dissolution is an important environmental transformation that affects the form and concentration of AgNPs in natural waters; however, studies on AgNP dissolution kinetics are complicated by nanoparticle aggregation. Herein, nanosphere lithography (NSL) was used to fabricate uniform arrays of AgNPs immobilized on glass substrates. Nanoparticle immobilization enabled controlled evaluation of AgNP dissolution in an air-saturated phosphate buffer (pH 7, 25 °C) under variable NaCl concentrations in the absence of aggregation. Atomic force microscopy (AFM) was used to monitor changes in particle morphology and dissolution. Over the first day of exposure to ≥10 mM NaCl, the in-plane AgNP shape changed from triangular to circular, the sidewalls steepened, and the height increased by 6-12 nm. Subsequently, particle height and inplane radius decreased at a constant rate over a 2-week period. Dissolution rates varied linearly from 0.4 to 2.2 nm/d over the 10-550 mM NaCl concentration range tested. NaCl-catalyzed dissolution of AgNPs may play an important role in AgNP fate in saline waters and biological media. This study demonstrates the utility of NSL and AFM for the direct investigation of unaggregated AgNP dissolution.iii Acknowledgements I thank my advisor, Dr. Peter Vikesland, for his insight, guidance, and innovative ideas throughout my time at Virginia Tech, and for giving me the opportunity to work on this research project. He was ready and available to help whenever I needed his input. I also thank the other members of my committee,

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Section: Nanosphere Lithographymentioning

confidence: 99%

Controlled Evaluation of Silver Nanoparticle Dissolution Using Atomic Force Microscopy

Kent

Vikesland

2012

Environ. Sci. Technol.

127

129

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“…In general, most of the reported ZnO nanostructures with different diameters and lengths are synthesized by various methods like solid-liquidvapor processes, metal-organic chemical vapor deposition, pulsed laser deposition, wet chemical methods and templateassisted methods. [18][19][20][21][22] Recently, the AAO-template route has been the most impressive way because of its low growth temperature and good potential for large scale synthesis of ordered nanostructures. [23][24][25][26][27][28] The photoluminescent properties of ZnO have received much attention because of the ability to tune the optical properties of ZnO by tailoring its band gap (direct band gap of 3.37 eV) with higher exciton binding energy (60 meV) as compared to other semiconductor materials such as ZnSe (22 meV), ZnS (40 meV) and GaN (25 meV) which make it suitable for short-wavelength optoelectronic devices and gas sensor applications.…”

Section: Introductionmentioning

confidence: 99%

Probing the highly efficient room temperature ammonia gas sensing properties of a luminescent ZnO nanowire array prepared via an AAO-assisted template route

et al. 2014

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Here, we report the facile synthesis of a highly ordered luminescent ZnO nanowire array using a low temperature anodic aluminium oxide (AAO) template route which can be economically produced in large scale quantity. The as-synthesized nanowires have diameters ranging from 60 to 70 nm and length ∼11 µm. The photoluminescence spectrum reveals that the AAO/ZnO assembly has a strong green emission peak at 490 nm upon excitation at a wavelength of 406 nm. Furthermore, the ZnO nanowire array-based gas sensor has been fabricated by a simple micromechanical technique and its NH 3 gas sensing properties have been explored thoroughly. The fabricated gas sensor exhibits excellent sensitivity and fast response to NH 3 gas at room temperature. Moreover, for 50 ppm NH 3 concentration, the observed value of sensitivity is around 68%, while the response and recovery times are 28 and 29 seconds, respectively. The present synthesis technique to produce a highly ordered ZnO nanowire array and a fabricated gas sensor has great potential to push the low cost gas sensing nanotechnology.

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“…Array density has been shown to have a large impact on the efficiency and uniformity of FE devices [4]. This control over array morphology can be achieved using nanosphere lithography (NSL) and there are many examples in the literature of well ordered, periodical arrays of ZnO nanowires grown via the use of NSL [5][6][7][8][9] to create an initial ordered template of metal islands on a substrate. NSL relies on producing a lithographic mask comprised of a close packed monolayer of polystyrene beads which can be produced with differing aperture sizes and separation.…”

Section: Introductionmentioning

confidence: 99%

Control of ZnO nanowire arrays by nanosphere lithography (NSL) on laser-produced ZnO substrates

Garry

McCarthy

Mosnier

et al. 2011

Applied Surface Science

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Nanosphere lithography (NSL) is a successful technique for fabricating highlyordered arrays of ZnO nanowires typically on sapphire and GaN substrates. In this work, we investigate the use of thin ZnO films deposited on Si by pulsed laser deposition (PLD) as the substrate. This has a number of advantages over the alternatives above, including cost and potential scalability of production and it removes any issue of inadvertent n-type doping of nanowires by diffusion from the substrate. We demonstrate ordered arrays of ZnO nanowires, on ZnO-coated substrates by PLD, using a conventional NSL technique with gold as the catalyst. The nanowires were produced by Vapor Phase Transport (VPT) growth in a tube furnace system and grew only on the areas pre-patterned by Au. We have also investigated the growth of ZnO nanowires using ZnO catalyst points deposited by PLD through an NSL mask on a bare silicon substrate.

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Large-Scale Hexagonal-Patterned Growth of Aligned ZnO Nanorods for Nano-optoelectronics and Nanosensor Arrays

Cited by 1,520 publications

References 15 publications

Controlled Evaluation of Silver Nanoparticle Dissolution Using Atomic Force Microscopy

Controlled Evaluation of Silver Nanoparticle Dissolution Using Atomic Force Microscopy

Probing the highly efficient room temperature ammonia gas sensing properties of a luminescent ZnO nanowire array prepared via an AAO-assisted template route

Control of ZnO nanowire arrays by nanosphere lithography (NSL) on laser-produced ZnO substrates

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