Thermal stability of size-selected arrays of gold nanoparticles on () sapphire – A thermal desorption spectroscopy study

Weigl, F.; Koslowski, B.; Ziemann, P.

doi:10.1016/j.susc.2008.10.015

Cited by 3 publications

(1 citation statement)

References 25 publications

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“…Likewise, the temperature at which plasma-treated arrays, with 4 nm spacing, are stable is higher than that found earlier for arrays with 2 nm spacing. Similar thermal annealing studies were carried out earlier on bare gold nanoparticle arrays, having sizes less than 4 nm and with interparticle spacings greater than 25 nm [42]. It was reported that the gold nanoparticles were found to vaporize rather than coalesce even after cycling to temperatures greater than their melting points, which was attributed to strong adhesion of the smaller nanoparticles with the substrate.…”

Section: Thermal Durability Studiessupporting

confidence: 71%

Realization of thermally durable close-packed 2D gold nanoparticle arrays using self-assembly and plasma etching

Sivaraman

Santhanam

2012

Nanotechnology

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Realization of thermally and chemically durable, ordered gold nanostructures using bottom-up self-assembly techniques are essential for applications in a wide range of areas including catalysis, energy generation, and sensing. Herein, we describe a modular process for realizing uniform arrays of gold nanoparticles, with interparticle spacings of 2 nm and above, by using RF plasma etching to remove ligands from self-assembled arrays of ligand-coated gold nanoparticles. Both nanoscale imaging and macroscale spectroscopic characterization techniques were used to determine the optimal conditions for plasma etching, namely RF power, operating pressure, duration of treatment, and type of gas. We then studied the effect of nanoparticle size, interparticle spacing, and type of substrate on the thermal durability of plasma-treated and untreated nanoparticle arrays. Plasma-treated arrays showed enhanced chemical and thermal durability, on account of the removal of ligands. To illustrate the application potential of the developed process, robust SERS (surface-enhanced Raman scattering) substrates were formed using plasma-treated arrays of silver-coated gold nanoparticles that had a silicon wafer or photopaper as the underlying support. The measured value of the average SERS enhancement factor (2 × 10(5)) was quantitatively reproducible on both silicon and paper substrates. The silicon substrates gave quantitatively reproducible results even after thermal annealing. The paper-based SERS substrate was also used to swab and detect probe molecules deposited on a solid surface.

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Section: Thermal Durability Studiessupporting

confidence: 71%

Realization of thermally durable close-packed 2D gold nanoparticle arrays using self-assembly and plasma etching

Sivaraman

Santhanam

2012

Nanotechnology

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Controlled synthesis of ultrathin ZnO nanowires using micellar gold nanoparticles as catalyst templates

et al. 2013

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We demonstrate a simple and effective approach to control the diameter of ultrathin ZnO nanowires with high aspect ratios and high densities over large areas. Diblock copolymer-based nanoparticle arrays exhibiting a high degree of hexagonal order and offering easy control of particle size (typically 1-10 nm) and interparticle spacing (25-150 nm) are utilized as nanocatalysts for the subsequent growth of semiconductor nanowires. The as-grown ZnO nanowires exhibit a single crystal hexagonal wurtzite structure and grow along the [0002] direction. Facetted catalyst particles were observed at the tip of the nanowires after synthesis, thus suggesting a catalyst-assisted vapor-solid-solid (VSS) rather than a vapor-liquid-solid (VLS) growth mechanism, the latter being frequently used in semiconductor nanowire production. Such a growth process allows us to easily prepare ultrathin ZnO nanowires with tunable diameters well below 10 nm by taking advantage of the inherent size control of the micellar method during deposition of the catalyst nanoparticles. Raman spectroscopy reveals a phonon confinement effect as the diameter of nanowires decreases. Photoluminescence spectra of these ultrathin nanowires indicate a blue shift of the free excitons and their phonon replicas by 37 meV induced by quantum confinement.

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Size-dependent effect of ion bombardment on Au nanoparticles on top of various substrates: Thermodynamically dominated capillary forces versus sputtering

et al. 2009

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Thermal stability of size-selected arrays of gold nanoparticles on () sapphire – A thermal desorption spectroscopy study

Cited by 3 publications

References 25 publications

Realization of thermally durable close-packed 2D gold nanoparticle arrays using self-assembly and plasma etching

Realization of thermally durable close-packed 2D gold nanoparticle arrays using self-assembly and plasma etching

Controlled synthesis of ultrathin ZnO nanowires using micellar gold nanoparticles as catalyst templates

Size-dependent effect of ion bombardment on Au nanoparticles on top of various substrates: Thermodynamically dominated capillary forces versus sputtering

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