Dendrimers - an Enabling Synthetic Science to Controlled Organic Nanostructures

2007 ◽  
pp. 815-862
Keyword(s):  
Organic Nanostructures

On-Surface Radical Oligomerisation: A New Approach to STM Tip-Induced Reactions

2018 ◽  
Author(s):  
Gaolei Zhan ◽  
Younes Makoudi ◽  
Judicael Jeannoutot ◽  
Simon Lamare ◽  
Michel Féron ◽  
...  
Keyword(s):  
Sample Surface ◽  
Scanning Tunnelling Microscope ◽  
Transfer Event ◽  
New Approach ◽  
The Past ◽  
Organic Nanostructures ◽  
Scanning Tunnelling ◽  
New Strategy ◽  
Surface Fabrication ◽  
And Control

Over the past decade, on-surface fabrication of organic nanostructures has been widely investigated for the development of molecular electronic devices, nanomachines, and new materials. Here, we introduce a new strategy to obtain alkyl oligomers in a controlled manner using on-surface radical oligomerisations that are triggered by the electrons/holes between the sample surface and the tip of a scanning tunnelling microscope. The resulting radical-mediated mechanism is substantiated by a detailed theoretical study. This electron transfer event only occurs when <i>V</i><sub>s</sub> < -3 V or <i>V</i><sub>s</sub> > + 3 V and allows access to reactive radical species under exceptionally mild conditions. This transfer can effectively ‘switch on’ a sequence leading to formation of oligomers of defined size distribution due to the on-surface confinement of reactive species. Our approach enables new ways to initiate and control radical oligomerisations with tunnelling electrons, leading to molecularly precise nanofabrication.

scholarly journals Ubiquitous organic molecule-based free-standing nanowires with ultra-high aspect ratios

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Koshi Kamiya ◽  
Kazuto Kayama ◽  
Masaki Nobuoka ◽  
Shugo Sakaguchi ◽  
Tsuneaki Sakurai ◽  
...  
Keyword(s):  
Critical Dimension ◽  
High Energy ◽  
Free Standing ◽  
Dry Process ◽  
3D Space ◽  
Aspect Ratios ◽  
Structural Functions ◽  
Planar Structures ◽  
Organic Nanostructures ◽  
Straight Trajectory

AbstractThe critical dimension of semiconductor devices is approaching the single-nm regime, and a variety of practical devices of this scale are targeted for production. Planar structures of nano-devices are still the center of fabrication techniques, which limit further integration of devices into a chip. Extension into 3D space is a promising strategy for future; however, the surface interaction in 3D nanospace make it hard to integrate nanostructures with ultrahigh aspect ratios. Here we report a unique technique using high-energy charged particles to produce free-standing 1D organic nanostructures with high aspect ratios over 100 and controlled number density. Along the straight trajectory of particles penetrating the films of various sublimable organic molecules, 1D nanowires were formed with approximately 10~15 nm thickness and controlled length. An all-dry process was developed to isolate the nanowires, and planar or coaxial heterojunction structures were built into the nanowires. Electrical and structural functions of the developed standing nanowire arrays were investigated, demonstrating the potential of the present ultrathin organic nanowire systems.

scholarly journals A Direct Route to Cyclic Organic Nanostructures via Ring-Expansion Metathesis Polymerization of a Dendronized Macromonomer

2009 ◽  
Vol 131 (15) ◽  
pp. 5388-5389 ◽  
Author(s):  
Andrew J. Boydston ◽  
Thomas W. Holcombe ◽  
David A. Unruh ◽  
Jean M. J. Fréchet ◽  
Robert H. Grubbs
Keyword(s):  
Ring Expansion ◽  
Metathesis Polymerization ◽  
Direct Route ◽  
Organic Nanostructures

Organic nanostructures of thermally activated delayed fluorescent emitters with enhanced intersystem crossing as novel metal-free photosensitizers

2016 ◽  
Vol 52 (79) ◽  
pp. 11744-11747 ◽  
Author(s):  
Jinfeng Zhang ◽  
Wencheng Chen ◽  
Rui Chen ◽  
Xiao-Ke Liu ◽  
Yuan Xiong ◽  
...  
Keyword(s):  
Singlet Oxygen ◽  
Intersystem Crossing ◽  
Oxygen Generation ◽  
Metal Free ◽  
Thermally Activated ◽  
Singlet Oxygen Generation ◽  
Organic Nanostructures

We applied organic nanostructures based on TADF emitters for singlet oxygen generation.

Mechanism of the metal-type conduction in organic nanostructures

2009 ◽  
Vol 52 (11) ◽  
pp. 1144-1152
Author(s):  
V. P. Nikitenko ◽  
A. R. Tameev ◽  
A. V. Vannikov
Keyword(s):  
Organic Nanostructures ◽  
Metal Type ◽  
Type Conduction

Surface-assisted Ullmann coupling

2017 ◽  
Vol 53 (56) ◽  
pp. 7872-7885 ◽  
Author(s):  
M. Lackinger
Keyword(s):  
Surface Chemistry ◽  
Organic Nanostructures ◽  
Low Dimensional ◽  
Ullmann Coupling

Surface-assisted Ullmann coupling is both drosophila and workhorse of on-surface synthesis. The fabrication of novel covalent low-dimensional organic nanostructures is accompanied by fundamental studies of surface chemistry.

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