Electronic, structural, and substrate effect properties of single-layer covalent organic frameworks

2015 ◽  
Vol 142 (18) ◽  
pp. 184708 ◽  
Author(s):  
Liangbo Liang ◽  
Pan Zhu ◽  
Vincent Meunier
Keyword(s):  
Single Layer ◽  
Substrate Effect ◽  
Covalent Organic Frameworks

scholarly journals Electron delocalization in single-layer phthalocyanine-based covalent organic frameworks: a first principle study

RSC Advances ◽  
2019 ◽  
Vol 9 (50) ◽  
pp. 29440-29447 ◽  
Author(s):  
Hung Q. Pham ◽  
Dong Q. Le ◽  
Nguyen-Nguyen Pham-Tran ◽  
Yoshiyuki Kawazoe ◽  
Duc Nguyen-Manh
Keyword(s):  
Electronic States ◽  
Single Layer ◽  
Electron Delocalization ◽  
First Principle ◽  
Covalent Organic Frameworks ◽  
Optoelectronic Applications

A series of single-layer phthalocyanine-based covalent-organic frameworks (COFs) are shown to possess tunable delocalized electronic states which are attractive for optoelectronic applications.

Surface-confined single-layer covalent organic frameworks: design, synthesis and application

2020 ◽  
Vol 49 (7) ◽  
pp. 2020-2038 ◽  
Author(s):  
Daling Cui ◽  
Dmitrii F. Perepichka ◽  
Jennifer M. MacLeod ◽  
Federico Rosei
Keyword(s):  
State Of The Art ◽  
Single Layer ◽  
The State ◽  
Covalent Organic Frameworks ◽  
Design Synthesis ◽  
Guest Chemistry

This review describes the state of the art of surface-confined single-layer covalent organic frameworks, focusing on reticular design, synthesis approaches, and exploring applications in host/guest chemistry.

On-surface synthesis of one-type pore single-crystal porous covalent organic frameworks

2019 ◽  
Vol 55 (72) ◽  
pp. 10800-10803
Author(s):  
Zhenliang Hao ◽  
Lingling Song ◽  
Cuixia Yan ◽  
Hui Zhang ◽  
Zilin Ruan ◽  
...  
Keyword(s):  
Single Crystal ◽  
Large Scale ◽  
Single Layer ◽  
Covalent Organic Frameworks

A 1,3,5-tris(4-bromophenyl)benzene precursor was employed to fabricate large-scale, one-type pore and single-layer pCOFs on the Ag(111) surface in a controllable manner.

Electron Delocalization in Single-Layer Phthalocyanine-Based Covalent Organic Frameworks: A First Principle Study

2019 ◽  
Author(s):  
Hung Pham ◽  
Dong Q. Le ◽  
Nguyen-Nguyen Pham-Tran ◽  
Yoshiyuki Kawazoe ◽  
Duc Nguyen-Manh
Keyword(s):  
Charge Carrier ◽  
Single Layer ◽  
Electron Delocalization ◽  
First Principle ◽  
Covalent Organic Frameworks ◽  
Optoelectronic Applications

<p>The electron delocalization in the single-layer phthalocyanine-based covalent-organic frameworks (COFs) makes them attractive materials for semiconducting and optoelectronic applications. Moreover, their electronic and charge carrier transporting performance can be engineered via rationally designing the building units.</p>

scholarly journals The impact of grafted surface defects on the on-surface Schiff-base chemistry at the solid–liquid interface

2018 ◽  
Vol 54 (71) ◽  
pp. 9905-9908 ◽  
Author(s):  
Nerea Bilbao ◽  
Yanxia Yu ◽  
Lander Verstraete ◽  
Jianbin Lin ◽  
Shengbin Lei ◽  
...  
Keyword(s):  
Schiff Base ◽  
Surface Defects ◽  
Single Layer ◽  
Liquid Interface ◽  
Covalent Organic Frameworks ◽  
Solid Liquid Interface ◽  
Solid Liquid ◽  
The Impact

We investigate the effect of covalently modified graphitic surfaces on the formation of single-layer covalent organic frameworks (sCOFs) at the solid–liquid interface.

Effects of Nanoscale Confinement and Interfaces on the Glass Transition Temperatures of a Series of Poly(n-methacrylate) Films

2007 ◽  
Vol 60 (10) ◽  
pp. 765 ◽  
Author(s):  
Rodney D. Priestley ◽  
Manish K. Mundra ◽  
Nina J. Barnett ◽  
Linda J. Broadbelt ◽  
John M. Torkelson
Keyword(s):  
Glass Transition ◽  
Free Surface ◽  
Surface Effect ◽  
Single Layer ◽  
Butyl Methacrylate ◽  
Hydroxyl Groups ◽  
Substrate Effect ◽  
Transition Temperatures ◽  
Glass Transition Temperatures ◽  
Bilayer Films

We use fluorescence from dye-labelled polymer to measure the glass transition temperatures (Tgs) across single-layer films and near surfaces and silica interfaces in bilayer films for a series of poly(n-methacrylate)s. With nanoscale confinement, the average Tg across a film supported on silica increases for poly(methyl methacrylate) (PMMA), decreases for poly(ethyl methacrylate) (PEMA) and poly(propyl methacrylate), and is nearly invariant for poly(iso-butyl methacrylate) (PIBMA). These trends are consistent with the relative strengths of local perturbations to Tg caused by surfaces and substrates as measured in bilayer films. The substrate effect, which increases Tg via hydrogen-bonding interactions between the polymer and hydroxyl groups on the silica surface, is stronger than the free-surface effect in PMMA. The free-surface effect, which reduces Tg via a reduction in the required cooperativity of the glass transition dynamics, is stronger than the substrate effect in PEMA. The substrate and free-surface effects have similar strengths in perturbing the local Tg in PIBMA, resulting in a net cancellation of effects when measurements are made across single-layer films.

Substrate Orientation Effect in the On-Surface Synthesis of Tetrathiafulvalene-Integrated Single-Layer Covalent Organic Frameworks

Langmuir ◽  
2015 ◽  
Vol 31 (43) ◽  
pp. 11755-11759 ◽  
Author(s):  
Wei-long Dong ◽  
Lin Wang ◽  
Hui-min Ding ◽  
Lu Zhao ◽  
Dong Wang ◽  
...  
Keyword(s):  
Single Layer ◽  
Orientation Effect ◽  
Covalent Organic Frameworks ◽  
Substrate Orientation

Electron Delocalization in Single-Layer Phthalocyanine-Based Covalent Organic Frameworks: A First Principle Study

2019 ◽  
Author(s):  
Hung Pham ◽  
Dong Q. Le ◽  
Nguyen-Nguyen Pham-Tran ◽  
Yoshiyuki Kawazoe ◽  
Duc Nguyen-Manh
Keyword(s):  
Charge Carrier ◽  
Single Layer ◽  
Electron Delocalization ◽  
First Principle ◽  
Covalent Organic Frameworks ◽  
Optoelectronic Applications

<p>The electron delocalization in the single-layer phthalocyanine-based covalent-organic frameworks (COFs) makes them attractive materials for semiconducting and optoelectronic applications. Moreover, their electronic and charge carrier transporting performance can be engineered via rationally designing the building units.</p>

THE GRAPHENE-SiC SUBSTRATE INTERACTION ENHANCED NEAR-INFRARED ABSORPTION

2011 ◽  
Vol 25 (16) ◽  
pp. 1393-1399
Author(s):  
X. G. XU ◽  
R. YIN ◽  
G. J. XU ◽  
J. C. CAO
Keyword(s):  
Optical Absorption ◽  
Optical Transmission ◽  
Near Infrared ◽  
Visible Region ◽  
Single Layer ◽  
Finite Energy ◽  
Infrared Region ◽  
Single Layer Graphene ◽  
Substrate Effect ◽  
Theoretical Results

When epitaxially grown on silicon carbide, a single layer graphene will exhibit a finite energy bandgap like a conventional semiconductor, and its energy dispersion is no longer linear in momentum space in the low energy regime. In this paper, we present a quantitative analysis on the effect of the SiC substrate in the optical absorption of π-electrons in graphene. We calculated the absorption matrix element and the optical absorption in the near infrared even to the visible region by taking into account the SiC substrate effect. It has been found that the substrate effect can significantly enhance the optical absorption in graphene in the near-infrared region, even by up to 90%. It may be helpful to eliminate the previous discrepancy of optical transmission between the theoretical results and the experimental results in the near-infrared to the visible region.

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