Preparation of Free-Standing Nanowire Arrays on Conductive Substrates

Liang, Yongqi; Zhen, Changgua; Zou, Dechun; Xu, Dongsheng

doi:10.1021/ja044545v

Cited by 136 publications

(102 citation statements)

References 31 publications

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“…By X-ray diffraction rocking curve measurements, θ-2θ scanning showed a full width at half maximum value of only 0.15° [48]. It should be noted, that because the as-grown nanowires have a small diameter, a large aspect ratio, and possibly a weak connection to the substrate, the sample had to be dried in supercritical fluid to preserve the ordered alignment [278]. Otherwise, the residue solution droplets on the nanowires gradually evaporated away and shrank in size, and the surface tension of the droplet bundled the nanowires together or swept them all down onto the substrate [279].…”

Section: Electron Beam Lithographymentioning

confidence: 99%

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: 99%

One-dimensional ZnO nanostructures: Solution growth and functional properties

2011

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“…The template-assisted methods for depositing one-dimensional nanostructured materials have been extensively studied and resulted in numerous publications and several reviews [140][141][142][143]. Various approaches, including electrochemical [144] and electroless deposition [145], sol-gel [146], chemical vapour deposition [143], and supercritical fluid deposition [147] have been exploited to deposit a range of 1 D nanostructures with single crystalline [148][149], polycrystalline [146] or amorphous [143] structure within these templates. Notably these methods are characterised by specific growth mechanisms and inclusion pathways, governed by the type of template support and deposition procedure.…”

Section: Additive Growth Schemesmentioning

confidence: 99%

Self-assembled templates for the generation of arrays of 1-dimensional nanostructures: From molecules to devices

Farrell

Petkov²,

Morris

et al. 2010

Journal of Colloid and Interface Science

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Self-assembled nanoscale porous architectures, such as mesoporous silica films (MPS), block copolymer films (BCP) and porous anodic aluminas (PAAs), are ideal hosts for templating one dimension (1 D) nano-entities for a wide range of electronic, photonic, magnetic and environmental applications. All three templates offer dimensional scalability and tunability over a wide range, with critical pore sizes for each system well below the 20 nm threshold [1][2][3]. Recently, research has progressed towards controlling the pore direction, orientation and long range order of these nanostructures through so called directed self-assembly (DSA). Significantly, the introduction of a wide range of top-down chemically and physically pre-patterning substrates has facilitated the DSA of nanostructures into functional device arrays. The following review begins with an overview of the fundamental aspects of self-assembly and ordering processes during the formation of PAAs, BCPs and MPS films. Special attention is given to the different ways of directing self-assembly, concentrating on properties such as uni-directional alignment, precision placement and registry of the self-assembled structures to hierarchal or top down architectures. Finally, to distinguish this review from other articles we focus on research where nanostructures have been utilised in part to fabricate arrays of functioning devices below the sub 50 nm threshold, by subtractive transfer and additive methods. Where possible, we attempt to compare and contrast the different templating approaches and highlight the strengths and/or limitations that will be important for their potential integration into downstream processes. ACCEPTED MANUSCRIPT 3 SECTION 1.0: SELF ASSEMBLY AND NANO-ARCHITETCURESThe diversity of self-assembled nanostructures and more importantly, their precise orientation within a thin film (fixed to a substrate) ultimately determines their function and overall application. A large population of research reports to date have focused on identifying these orientations and related periodicities, using x-ray and microscopy tools, as well the development of methods for readily manipulating nanostructures, such as pre-patterning of silicon substrates for the alignment of block copolymers (BCPs) [4] and mesoporous thin films (MTFs) [5] and altering the growth direction of porous anodic alumina (PAA) templates [6]. In this section, a brief synopsis of the mechanisms behind the self-assembly/organisation of each system and highlight nanoscale architectures (and orientations), which are important from a device perspective. Templated mesoporous thin filmsOrdered mesoporous powders were first discovered by researchers at the Mobil Petrochemical Corporation in 1992 and shortly after, sol-gel derived mesoporous silica films were fabricated [1,7].The first series of ordered mesoporous films were reported by Yang et al. in 1996 [8], prepared using initial surfactant concentrations above their critical micelle concentration (CMC). However the films prepared fil...

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“…Because the as-grown NWs have a small diameter and a large aspect ratio, the sample needs a supercritical drying when the hydrothermal growth is complete. 23 Or else, when † School of Material Science and Engineering. ‡ School of Physics.…”

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confidence: 99%