Epitaxially Driven Formation of Intricate Supported Gold Nanostructures on a Lattice-Matched Oxide Substrate

Devenyi, Gabriel A.; Li, Jianfeng; Hughes, Robert A.; Shi, An‐Chang; Mascher, P.; Preston, J. S.

doi:10.1021/nl902491g

Cited by 20 publications

(10 citation statements)

References 52 publications

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“…The nanostructures formed are usually well bonded to the substrate, having a contact angle determined by surface energy considerations, obeying Young's equation subjected to retention forces [15] for large particle sizes, but where this relationship is altered somewhat on the nanoscale [16]. The structures formed are also influenced by the crystallographic orientation of the substrate [17] and film [18], the lattice mismatch between the substrate and metal [17], substrate surface reconstructions [19], nanostructure faceting [20] and interface chemistry [21].…”

Section: Introductionmentioning

confidence: 99%

Altering the dewetting characteristics of ultrathin gold and silver films using a sacrificial antimony layer

et al. 2012

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Solid state dewetting of ultrathin films is the most straightforward means of fabricating substrate-supported noble metal nanostructures. This assembly process is, however, quite inflexible, yielding either densely packed smaller structures or widely spaced larger structures. Here, we demonstrate the utility of introducing a sacrificial antimony layer between the substrate and noble metal overlayer. We observe an agglomeration process which is radically altered by the concurrent sublimation of antimony. In stark contrast with conventional dewetting, where the thickness of the deposited metal film determines the characteristic length scales of the assembly process, it is the thickness of the sacrificial antimony layer which dictates both the nanoparticle size and interparticle spacing. The result is a far more flexible self-assembly process where the nanoparticle size and areal density can be varied widely. Demonstrations show nanoparticle areal densities which are varied over four orders of magnitude assembled from the identical gold layer thickness, where the accompanying changes to nanostructure size see a systematic shift in the wavelength of the localized surface plasmon resonance. As a pliable self-assembly process, it offers the opportunity to tailor the properties of an ensemble of nanostructures to meet the needs of specific applications.

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Section: Introductionmentioning

confidence: 99%

Altering the dewetting characteristics of ultrathin gold and silver films using a sacrificial antimony layer

et al. 2012

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“…4,18,44 On the other hand, the Au{111} facet shows the lowest surface energy value of the crystal and is clearly the most CdSe{0001}/Au{111} and CdSe[101 ¯0]/Au [112] stable one, as reflected in the tendency of thin-film growth to propagate in the [111] direction. [45][46][47] The high mobility of Au atoms 24,25 facilitates its reconstruction on the CdSe surface during the annealing process. Therefore, a larger and well-defined {111} surface is developed.…”

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confidence: 99%

Epitaxial CdSe-Au Nanocrystal Heterostructures by Thermal Annealing

et al. 2010

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The thermal evolution of a collection of heterogeneous CdSe-Au nanosystems (Au-decorated CdSe nanorods, networks, vertical assemblies) prepared by wet-chemical approaches was monitored in situ in the transmission electron microscope. In contrast to interfaces that are formed during kinetically controlled wet chemical synthesis, heating under vacuum conditions results in distinct and well-defined CdSe/Au interfaces, located at the CdSe polar surfaces. The high quality of these interfaces should make the heterostructures more suitable for use in nanoscale electronic devices.

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“…The variance of observation C j is given by propagation of uncertainties equation for independent random errors (Devenyi et al, 2009):…”

Section: Resultsmentioning

confidence: 99%

A “Thickness Series”: Weak Signal Extraction of ELNES in EELS Spectra From Surfaces

Zhu

Botton

2013

Microsc Microanal

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We report a new simple but effective method to extract the weak surface signals from a "thickness series" of recorded electron energy-loss spectra. Using precise thickness measurements and energy-loss near-edge structures measured at increasing thicknesses, we are able to extract the surface and bulk components in the series. The electronic structure and bonding information from SrTiO3 (001) reconstructed surfaces have been successfully obtained by applying this approach. This approach can be applied to study many other cases including absorbed monolayers and beam-sensitive interfaces.

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Epitaxially Driven Formation of Intricate Supported Gold Nanostructures on a Lattice-Matched Oxide Substrate

Cited by 20 publications

References 52 publications

Altering the dewetting characteristics of ultrathin gold and silver films using a sacrificial antimony layer

Altering the dewetting characteristics of ultrathin gold and silver films using a sacrificial antimony layer

Epitaxial CdSe-Au Nanocrystal Heterostructures by Thermal Annealing

A “Thickness Series”: Weak Signal Extraction of ELNES in EELS Spectra From Surfaces

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