Hybrid Materials from Diaminopyriminide-functionalized Poly(hexylthiophene) and Thymine-capped CdSe Nanocrystals: Part II — Hydrogen Bond Assisted Layer-by-layer Molecular Level Processing

2008 ◽  
Vol 112 (24) ◽  
pp. 8797-8801 ◽  
Author(s):  
Julia De Girolamo ◽  
Peter Reiss ◽  
Adam Pron
Keyword(s):  
Hydrogen Bond ◽  
Hybrid Materials ◽  
Molecular Level ◽  
Cdse Nanocrystals ◽  
Layer By Layer

Layer-by-layer assembled enzyme multilayers with adjustable memory performance and low power consumption via molecular-level control

2012 ◽  
Vol 22 (11) ◽  
pp. 4645 ◽  
Author(s):  
Hyunhee Baek ◽  
Chanwoo Lee ◽  
Jeongju Park ◽  
Younghoon Kim ◽  
Bonkee Koo ◽  
...  
Keyword(s):  
Power Consumption ◽  
Low Power ◽  
Molecular Level ◽  
Memory Performance ◽  
Low Power Consumption ◽  
Layer By Layer ◽  
Level Control

scholarly journals Unraveling the Growth Mechanism of Magic-Sized Semiconductor Nanocrystals

2020 ◽  
Author(s):  
Aniket S. Mule ◽  
Sergio Mazzotti ◽  
Aurelio A. Rossinelli ◽  
Marianne Aellen ◽  
P. Tim Prins ◽  
...  
Keyword(s):  
Growth Mechanism ◽  
Surface Reaction ◽  
Size Range ◽  
Semiconductor Nanocrystals ◽  
Nucleation Theory ◽  
Classical Nucleation Theory ◽  
Cdse Nanocrystals ◽  
Layer By Layer ◽  
Zinc Blende ◽  
Kinetic Barriers

Magic-sized clusters (MSCs) of semiconductor are typically defined as specific molecular-scale arrangements of atoms that exhibit enhanced stability. They often grow in discrete jumps, creating a series of crystallites, without the appearance of intermediate sizes. However, despite their long history, the mechanism behind their special stability and growth remains poorly understood. This is particularly true considering experiments that have shown discrete evolution of MSCs to sizes well beyond the “cluster” regime and into the size range of colloidal quantum dots. Here, we study the growth of these larger magic-sized CdSe nanocrystals to unravel the underlying growth mechanism. We first introduce a synthetic protocol that yields a series of nine magic-sized nanocrystals of increasing size. By investigating these crystallites, we obtain important clues about the mechanism. We then develop a microscopic model that uses classical nucleation theory to determine kinetic barriers and simulate the growth. We show that magic-sized nanocrystals are consistent with a series of zinc-blende crystallites that grow layer by layer under surface-reaction-limited conditions. They have a tetrahedral shape, which is preserved when a monolayer is added to any of its four identical facets, leading to a series of discrete nanocrystals with special stability. Our analysis also identifies strong similarities with the growth of semiconductor nanoplatelets, which we then exploit to increase further the size range of our magic-sized nanocrystals. Although we focus here on CdSe, these results reveal a fundamental growth mechanism that can provide a different approach to nearly monodisperse nanocrystals.

Molecular-Level Manipulation of V2O5/Polyaniline Layer-by-Layer Films To Control Electrochromogenic and Electrochemical Properties

2004 ◽  
Vol 16 (11) ◽  
pp. 2293-2299 ◽  
Author(s):  
Fritz Huguenin ◽  
Marystela Ferreira ◽  
Valtencir Zucolotto ◽  
Franscisco C. Nart ◽  
Roberto M. Torresi ◽  
...  
Keyword(s):  
Electrochemical Properties ◽  
Molecular Level ◽  
Layer By Layer
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