Fabrication of diameter-modulated and ultrathin porous nanowires in anodic aluminum oxide templates

Sulka, Grzegorz D.; Brzózka, Agnieszka; Liu, Lifeng

doi:10.1016/j.electacta.2011.03.126

Cited by 106 publications

(73 citation statements)

References 45 publications

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“…Fabrication of cross-section modulated nanowires (MNWs) with layer thickness from several ML up to several nanometers is still a technological challenge. However, recent reports of fabrication of InP, InN/InGaN or metallic MNWs [40][41][42][43][44] suggest that nanostructures considered in this work are feasible.…”

mentioning

confidence: 99%

Thermal conductivity inhibition in phonon engineered core-shell cross-section modulated Si/Ge nanowires

Nika

Cocemasov

Crismari

et al. 2013

Applied Physics Letters

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We have shown theoretically that a combination of cross-section modulation and acoustic mismatch in the core-shell Si/Ge nanowires can lead to a drastic reduction of the thermal conductivity. Our calculations, which utilized two different models -five-parameter Bornvon Karman and six-parameter valence-force field -for the lattice vibrations, indicate that the room temperature thermal conductivity of Si/Ge cross-section modulated nanowires is almost three orders of magnitude lower than that of bulk Si. Thermal flux in the modulated nanowires is suppressed by an order of magnitude in comparison with generic Si nanowires.The effect is explained by modification of the phonon spectra in modulated nanowires leading to decrease of the phonon group velocities and localization of certain phonon modes in narrow or wide nanowire segments. The thermal conductivity inhibition is achieved in nanowires without additional surface roughness and, thus, potentially reducing degradation of the electron transport. Our results suggest that the acoustically mismatched cross-section modulated nanowires are promising candidates for thermoelectric applications.

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confidence: 99%

Thermal conductivity inhibition in phonon engineered core-shell cross-section modulated Si/Ge nanowires

Nika

Cocemasov

Crismari

et al. 2013

Applied Physics Letters

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“…These could possibly apply to other one-dimensional channel materials, or 'thicker' width-modulated materials which would be more stable and realizable. For example, semiconductor width-modulated nanowires were experimentally demonstrated and indicated no stability concerns [49,50].…”

Section: Methodsmentioning

confidence: 99%

Phonon transport effects in one-dimensional width-modulated graphene nanoribbons

Karamitaheri

Neophytou

2016

Journal of Applied Physics

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We investigate the thermal conductance of one-dimensional periodic widthmodulated graphene nanoribbons using lattice dynamics for the phonon spectrum and the Landauer formalism for phonon transport. We conduct a full investigation considering all relevant geometrical features, i.e. the various lengths and widths of the narrow and wide regions that form the channel. In all cases that we examine, we find that widthmodulation suppresses the thermal conductance at values even up to ~70 % below those of the corresponding uniform narrow nanoribbon. We show that this can be explained by the fact that the phonon spectrum of the width-modulated channels acquires less dispersive bands with lower group velocities and several narrow bandgaps, which reduce the phonon transmission function significantly. The largest degradation in thermal conductance is determined by the geometry of the narrow regions. The geometry of the wider regions also influences thermal conductance, although modestly. Our results add to the ongoing efforts in understanding the details of phonon transport at the nanoscale, and our conclusions are generic and could also apply to other one-dimensional channel materials.

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“…For example, anodic aluminum oxide (AAO) are often used as template to synthesize 1D nanowire arrays. [46,47] Additionally, 1D nanostructures can be also synthesized without templates. View from the existing literature, hydrothermal method, chemical [40] Copyright 2017, Elsevier.…”

Section: D Carbon Nanostructuresmentioning

confidence: 99%

Progress of Nanostructured Electrode Materials for Supercapacitors

Jiang

Yadi

Nie

et al. 2017

Advanced Sustainable Systems

111

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Supercapacitors, as a type of energy storage system, bridge the power/energy gap between conventional capacitors and batteries due to attractive properties such as high power density, long cycle lifespan, and large temperature range. However, the low energy density of supercapacitors compared to lithium‐ion batteries has hindered their general application. In general, the electrochemical performance of supercapacitors is closely related to the structure of their electrode materials, electrolytes, and device design. The main materials used in electrochemical double‐layer capacitors (EDLCs) are carbon materials with various architectures. This is due to their high surface area, good electric conductivity, and intrinsic stability. In this review, recently reported carbon‐based nanostructured electrode materials with 0D, 1D, 2D, and 3D structures are systematically reviewed. The effect of nanostructuring on the properties of supercapacitors including specific capacitance, rate capability, and cycle stability is explored, the details of which may serve as a guide to electrode design for the next generation of EDLCs.

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Fabrication of diameter-modulated and ultrathin porous nanowires in anodic aluminum oxide templates

Cited by 106 publications

References 45 publications

Thermal conductivity inhibition in phonon engineered core-shell cross-section modulated Si/Ge nanowires

Thermal conductivity inhibition in phonon engineered core-shell cross-section modulated Si/Ge nanowires

Phonon transport effects in one-dimensional width-modulated graphene nanoribbons

Progress of Nanostructured Electrode Materials for Supercapacitors

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