Evolution of a Steady State Island Size Distribution during Self-Assembled Monolayer Dissolution

2000 ◽  
Vol 104 (38) ◽  
pp. 9044-9047 ◽  
Author(s):  
Ivo Doudevski ◽  
Daniel K. Schwartz
Keyword(s):  
Steady State ◽  
Size Distribution ◽  
Self Assembled Monolayer ◽  
Island Size ◽  
Self Assembled

Influence of H2 Preconditioning on the Nucleation and Growth of Self-Assembled Germanium Islands on Silicon (001)

2004 ◽  
Vol 820 ◽  
Author(s):  
Gabriela D.M. Dilliway ◽  
Nicholas E.B. Cowern ◽  
Lu Xu ◽  
Patrick J. McNally ◽  
Chris Jeynes ◽  
...  
Keyword(s):  
Size Distribution ◽  
Self Assembly ◽  
Surface Coverage ◽  
Rutherford Backscattering Spectrometry ◽  
Chemical Vapour ◽  
Growth Conditions ◽  
Island Size ◽  
Practical Applications ◽  
Compositional Evolution ◽  
Self Assembled

AbstractUnderstanding the effects of growth conditions on the process of self-organisation of Ge nanostructures on Si is a key requirement for their practical applications. In this study we investigate the effect of preconditioning with a high-temperature hydrogenation step on the nucleation and subsequent temporal evolution of Ge self-assembled islands on Si (001). Two sets of structures, with and without H2 preconditioning, were grown by low pressure chemical vapour deposition (LPCVD) at 650°C. Their structural and compositional evolution was characterised by Rutherford backscattering spectrometry (RBS), atomic force microscopy (AFM) and micro-Raman (νRaman) spectroscopy. In the absence of preconditioning, we observe the known evolution of self-assembled Ge nanostructures on Si (001), from small islands with a narrow size distribution, to a bimodal size distribution, through to large islands. Surface coverage and island size increase steadily as a function of deposition time. On the H2 preconditioned surface, however, both nucleation rates and surface coverage are greatly increased during the early stages of self-assembly. After the first five seconds, the density of the islands is twice that on the unconditioned surface, and the mean island size is also larger, but the subsequent evolution is much slower than in the case of the unconditioned surface. This retardation correlates with a relatively high measured stress within the islands. Our results demonstrate that standard processes used during growth, like H2 preconditioning, can yield dramatic changes in the uniformity and distribution of Ge nanostructures self-assembled on Si.

Germanium Island Size Distribution by Atomistic Simulation

2003 ◽  
Vol 794 ◽  
Author(s):  
Richard J. Wagner ◽  
Erdogan Gulari
Keyword(s):  
Quantum Dots ◽  
Epitaxial Growth ◽  
Size Distribution ◽  
Atomistic Simulation ◽  
Chemical Potential ◽  
Gibbs Distribution ◽  
Nanometer Scale ◽  
Size Distributions ◽  
Island Size ◽  
Self Assembled

ABSTRACTStrained epitaxial growth of Ge on Si(001) produces self-assembled, nanometer scale islands, or quantum dots. We study this growth by atomistic simulation, computing the energy of island structures to determine when and how islanding occurs. The distribution of island sizes on a surface is determined by the relation of island energy to size. Applying the calculated chemical potential to the Boltzmann-Gibbs distribution, we predict size distributions as functions of coverage and temperature. The peak populations around 80 000 atoms (35 nm wide) compare favorably with experiment.

Self-Assembled Fluid Phase Floating Membranes with Tuneable Water Interlayers

2019 ◽  
Author(s):  
Luke Clifton ◽  
Nicoló Paracini ◽  
Arwel V. Hughes ◽  
Jeremy H. Lakey ◽  
Nina-Juliane Seinke ◽  
...  
Keyword(s):  
Fluid Phase ◽  
Interlayer Thickness ◽  
Supported Bilayers ◽  
Self Assembled Monolayer ◽  
High Coverage ◽  
Nano Technology ◽  
Surface Distance ◽  
Potential Applications ◽  
Self Assembled ◽  
Coated Surfaces

<p>We present a reliable method for the fabrication of fluid phase unsaturated bilayers which are readily self-assembled on charged self-assembled monolayer (SAM) surfaces producing high coverage floating supported bilayers where the membrane to surface distance could be controlled with nanometer precision. Vesicle fusion was used to deposit the bilayers onto anionic SAM coated surfaces. Upon assembly the bilayer to SAM solution interlayer thickness was 7-10 Å with evidence suggesting that this layer was present due to SAM hydration repulsion of the bilayer from the surface. This distance could be increased using low concentrations of salts which caused the interlayer thickness to enlarge to ~33 Å. Reducing the salt concentration resulted in a return to a shorter bilayer to surface distance. These accessible and controllable membrane models are well suited to a range of potential applications in biophysical studies, bio-sensors and Nano-technology.</p><br>

Heterometallic Co-Dy SMMs grafted on iron oxide nanoparticles

2021 ◽  
Author(s):  
Lidia Rosado Piquer ◽  
Jan Dreiser ◽  
E. Carolina Sañudo
Keyword(s):  
Iron Oxide ◽  
Iron Oxide Nanoparticles ◽  
Oxide Nanoparticles ◽  
Self Assembled Monolayer ◽  
Self Assembled ◽  
System 1

The heterometallic 3d-4f SMM [Co4Dy(OH)2(SALOH)5(chp)4(MeCN)(H2O)2] (1) has been deposited onto iron oxide nanoparticles (NP) with an oleate self-assembled monolayer (SAM) as surfactant. The hybrid molecular-inorganic system 1-NP has been thoroughly...

scholarly journals Chirality in porous self-assembled monolayer networks at liquid/solid interfaces: induction, reversion, recognition and transfer

2021 ◽  
Author(s):  
Yoshito Tobe ◽  
Kazukuni Tahara ◽  
Steven De Feyter
Keyword(s):  
Two Dimensions ◽  
Self Assembled Monolayer ◽  
Supramolecular Chirality ◽  
Potential Applications ◽  
Self Assembled ◽  
Chirality Control

Chirality in two-dimensions (2D) has attracted increasing attention with regard to interesting fundamental aspects as well as potential applications. This article reports several aspects of supramolecular chirality control as exemplified...

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