Journal ArticleDOI
Controlled growth of gold nanoparticles on silica nanowires
Aaron D. LaLonde,M. Grant Norton,Daqing Zhang,Devananda Gangadean,Abdullah Alkhateeb,Radhakrishnan Padmanabhan,David N. McIlroy +6 more
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TLDR
In this article, the activation energy for surface diffusion of gold nanoparticles on SiO2 nanowires was determined to be 10.4 kJ/mol using transmission electron microscopy.Abstract:
Production of gold nanoparticles with the specific goal of particle size control has been investigated by systematic variation of chamber pressure and substrate temperature. Gold nanoparticles have been synthesized on SiO2 nanowires by plasma-enhanced chemical vapor deposition. Determination of particle size and particle size distribution was done using transmission electron microscopy. Average nanoparticle diameters were between 4 and 12 nm, with particle size increasing as substrate temperature increased from 573 to 873 K. A bimodal size distribution was observed at temperatures ≥723 K indicating Ostwald ripening dominated by surface diffusion. The activation energy for surface diffusion of gold on SiO2 was determined to be 10.4 kJ/mol. Particle sizes were found to go through a maximum with increases in chamber pressure. Competition between diffusion within the vapor and dissociation of the precursor caused the pressure effect.read more
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Nucleation Control of Size and Dispersity in Aggregative Nanoparticle Growth. A Study of the Coarsening Kinetics of Thiolate-Capped Gold Nanocrystals
TL;DR: In this paper, the thermal coarsening of decanethiolate-capped Au nanocrystals at various tetraoctylammonium bromide concentrations was studied.
Journal ArticleDOI
Principles and mechanisms of gas sensing by GaN nanowires functionalized with gold nanoparticles
Vladimir Dobrokhotov,David N. McIlroy,M. Grant Norton,A. Abuzir,W. J. Yeh,Ian H. Stevenson,R. Pouy,J. Bochenek,M. Cartwright,Lidong Wang,J. Dawson,Miles F. Beaux,Chris Berven +12 more
TL;DR: In this paper, the electrical properties of a chemical sensor constructed from mats of GaN nanowires decorated with gold nanoparticles as a function of exposure to Ar, N2, and methane are presented.
Journal ArticleDOI
Green synthesis of robust, biocompatible silver nanoparticles using garlic extract
Gregory Von White,Petra Kerscher,Ryan M. Brown,Jacob D. Morella,William McAllister,Delphine Dean,Christopher L. Kitchens +6 more
TL;DR: Cytotoxicity assays indicated no decrease in cellular proliferation for vascular smooth muscle cells and 3T3 fibroblasts at a concentration of 25 μg/ml, confirming that garlic extract prepared silver nanoparticles are ideal candidates for future experimentation and implementation into biomedical applications.
Journal ArticleDOI
Synthesis of silver nanoparticles using flavonoids: hesperidin, naringin and diosmin, and their antibacterial effects and cytotoxicity
Nidhi Sahu,Deepika Soni,B. Chandrashekhar,Dewanand Satpute,Sivanesan Saravanadevi,Bijaya Ketan Sarangi,R.A. Pandey +6 more
TL;DR: In this paper, three different flavonoids -hesperidin, naringin and diosmin -were used for the synthesis of silver nanoparticles (AgNPs).
Journal ArticleDOI
Plasmonic Gold Nanoparticles (AuNPs): Properties, Synthesis and their Advanced Energy, Environmental and Biomedical Applications.
Nafeesa Sarfraz,Ibrahim Khan +1 more
TL;DR: A comprehensive and tutorial overview of various synthetic methods to design highly plasmonic gold nanoparticles, along with a brief essay to understand the experimental procedure for each technique is provided in this article.
References
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Journal ArticleDOI
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Journal ArticleDOI
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TL;DR: In this article, the melting points of small gold particles have been measured using a scanning electron-diffraction technique and the experimental results are quantitatively in good agreement with two phenomenological models.
Journal ArticleDOI
Alkanethiolate Gold Cluster Molecules with Core Diameters from 1.5 to 5.2 nm: Core and Monolayer Properties as a Function of Core Size
Michael J. Hostetler,Julia E. Wingate,Chuan-Jian Zhong,Jay E. Harris,Richard W. Vachet,Michael R. Clark,J. David Londono,Stephen J. Green,Jennifer J. Stokes,George D. Wignall,Gary L. Glish,Marc D. Porter,Neal D. Evans,Royce W. Murray +13 more
TL;DR: The mean size of the gold core in the synthesis of dodecanethiolate-stabilized Au cluster compounds can be finely adjusted by choice of the Au:dodecanETHiolate ratio and the temperature and rate at which the reduction is conducted as mentioned in this paper.