Type

Journal Article

Authors

Justin D. Holmes
Michael A. Morris
Achintya Singha
Subhajit Biswas

Subjects

Physics

Topics
electron microscopy supercritical fluid solid solid sfss growth physical properties nanowire morphology growth characteristics environment formation twin germanium high aspect ratio agxau1 x alloy nanowires

Inherent control of growth, morphology, and defect formation in germanium nanowires. (2012)

Abstract The use of bimetallic alloy seeds for growing one-dimensional nanostructures has recently gained momentum among researchers. The compositional flexibility of alloys provides the opportunity to manipulate the chemical environment, reaction kinetics, and thermodynamic behavior of nanowire growth, in both the eutectic and the subeutectic regimes. This Letter describes for the first time the role of Au(x)Ag(1-x) alloy nanoparticles in defining the growth characteristics and crystal quality of solid-seeded Ge nanowires via a supercritical fluid growth process. The enhanced diffusivity of Ge in the alloy seeds, compared to pure Ag seeds, and slow interparticle diffusion of the alloy nanoparticles allows the realization of high-aspect ratio nanowires with diameters below 10 nm, via a seeded bottom-up approach. Also detailed is the influence the alloyed seeds have on the crystalline features of nanowires synthesized from them, that is, planar defects. The distinctive stacking fault energies, formation enthalpies, and diffusion chemistries of the nanocrystals result in different magnitudes of {111} stacking faults in the seed particles and the subsequent growth of <112>-oriented nanowires with radial twins through a defect transfer mechanism, with the highest number twinned Ge nanowires obtained using Ag(0.75)Au(0.25) growth seeds. Employing alloy nanocrystals for intrinsically dictating the growth behavior and crystallinity of nanowires could open up the possibility of engineering nanowires with tunable structural and physical properties.
Collections Ireland -> University College Cork -> PubMed
Ireland -> University College Cork -> College of Science, Engineering and Food Science
Ireland -> University College Cork -> Tyndall National Institute
Ireland -> University College Cork -> Tyndall National Institute - Journal Articles
Ireland -> University College Cork -> Chemistry
Ireland -> University College Cork -> Chemistry - Journal Articles
Ireland -> University College Cork -> Research Institutes and Centres

Full list of authors on original publication

Justin D. Holmes, Michael A. Morris, Achintya Singha, Subhajit Biswas

Experts in our system

1
Justin D. Holmes
University College Cork
Total Publications: 287
 
2
Michael A. Morris
University College Cork
Total Publications: 164
 
3
Achintya Singha
University College Cork
Total Publications: 8
 
4
Subhajit Biswas
University College Cork
Total Publications: 43