How active sites facilitate charge-transfer interactions of silver and gold clusters with TCNQ?

2017 ◽  
Vol 19 (32) ◽  
pp. 21777-21782 ◽  
Author(s):  
Jing Chen ◽  
Zhixun Luo ◽  
Jiannian Yao
Keyword(s):  
Charge Transfer ◽  
Noble Metal ◽  
Electron Acceptor ◽  
Active Sites ◽  
Organic Molecules ◽  
Metal Clusters ◽  
Gold Clusters ◽  
Acceptor Molecule ◽  
Strong Electron

Utilizing a strong electron acceptor molecule tetracyanoquinodimethane (TCNQ) as probe, we demonstrate how the electronic features and geometric sites determine charge-transfer interactions of noble metal clusters with organic molecules.

Scanning-Probe-Induced Assembling of Gold Striations on Mono- and Bi-Layered MoS2 on SiO2

MRS Advances ◽  
2020 ◽  
Vol 5 (43) ◽  
pp. 2201-2207
Author(s):  
Felix Trillitzsch ◽  
Arkadiusz Janas ◽  
Alper Özogul ◽  
Christof Neumann ◽  
Antony George ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Single Crystal ◽  
Metal Clusters ◽  
Gold Clusters ◽  
Scanning Probe ◽  
Electrostatic Repulsion ◽  
Thermally Stable ◽  
Thin Wires ◽  
Scan Path ◽  
Layered Mos2

ABSTRACTSingle crystal gold clusters (10 nm in size) have been collectively manipulated on mono- and bi-layered MoS2 islands (up to 20 µm) grown on SiO2 using AFM. On the monolayer the clusters tend to move in a direction corresponding to the zigzag alignment of the Mo and S atoms, and assemble into long striation patterns parallel to the scan direction. The distance between consecutive stripes is inversely proportional to the cluster concentration and size. A more detailed observation based on SEM shows that within each stripe the clusters remain separated by gaps of few nm in width possibly caused by electrostatic repulsion and/or the roughness of the SiO2 substrate (~2 nm). The stripes also proved to be thermally stable, preserving their superstructures up to 823 K. On the bilayer gold clusters are much less prone to move and assemble into stripes. These results suggest that the formation of nanostructures resulting from collective manipulation of metal clusters can be oriented by a properly chosen scan path in a rather straightforward way (as compared to one-by-one displacement of single clusters). The goal of forming µm-long but nm-thin wires with a geometrically defined shape could be easily reached with the use of smoother substrates or TMD materials with lesser charge transfer to metals adsorbed on them.

The Inspiration and Challenge for Through-Space Charge Transfer Architecture: From Thermally Activated Delayed Fluorescence to Nonlinear Optical Properties

2021 ◽  
Author(s):  
Jin-Ting Ye ◽  
Yongqing Qiu
Keyword(s):  
Optical Properties ◽  
Charge Transfer ◽  
Space Charge ◽  
Electron Acceptor ◽  
Nonlinear Optical ◽  
Organic Molecules ◽  
Building Blocks ◽  
Delayed Fluorescence ◽  
Thermally Activated Delayed Fluorescence ◽  
Thermally Activated

Organic molecules consisting of electron donor (D) and electron acceptor (A) subunits linked by π-conjugated bridge are promising building blocks for the thermally activated delayed fluorescence (TADF) and nonlinear optical...

scholarly journals Novel heterostructure Cu2S/Ni3S2 coral-like nanoarrays on Ni foam to enhance hydrogen evolution reaction in alkaline media

RSC Advances ◽  
2021 ◽  
Vol 11 (62) ◽  
pp. 39493-39502
Author(s):  
Yizhi Peng ◽  
Hanwei He
Keyword(s):  
Charge Transfer ◽  
Hydrogen Evolution ◽  
Water Splitting ◽  
Noble Metal ◽  
Hydrogen Evolution Reaction ◽  
Active Sites ◽  
Alkaline Media ◽  
Ni Foam ◽  
Nanosheet Array ◽  
Alkaline Conditions

We fabricated a heterostructure Cu2S/Ni3S2 nanosheet array, which can accelerate charge transfer and provide more active sites. This work provides a promising non-noble metal electrocatalyst for water splitting under alkaline conditions.

New Electron Acceptor for the Control of Crystal Structures and the Generation of High Optical Nonlinearities

1999 ◽  
Vol 598 ◽  
Author(s):  
L. S. Pu ◽  
Y. Nishikata
Keyword(s):  
Electron Acceptor ◽  
Molecular Orientation ◽  
Nonlinear Optical ◽  
Organic Molecules ◽  
Second Order ◽  
Bulk Crystals ◽  
Molecular Absorption ◽  
Strong Electron ◽  
Molecular Hyperpolarizability ◽  
D Values

ABSTRACTCyclobutenedione (CD) as a new electron acceptor for second order nonlinear optical materials is reported. After syntheses and evaluation of new materials containing CD, it is observed that CD is not only a strong electron acceptor to enhance second order molecular hyperpolarizability (β), but also the first substituent to control the molecular orientation in crystals. Compared with nitro (NO2) subsutitent, CD is shown to be advantageous in higher molecular absorption coefficient (ε), shorter λcut-off and easy introduction of chirality with hydrogen bonds into organic molecules. These advantages are useful to produce higher β values and second order nonlinear optical coefficients (dIJK) than nitro analogue, by controlling the molecular orientation in bulk crystals. In particular, CD substituted with chiral 1-amino-2-propanol is shown by x-ray crystallographic analyses to have a function to control molecular orientation one dimensionally in a mono-molecular plate of crystals with space group P1. By oriented gas model, very large d-values including off-diagonals were obtained. From the analysis of the Maker fringe pattern, the coefficient d11 of DAD ((-)-1-(4-dimethyl aminophenyl)-2-(2-hydroxypropylamino)cyclobutene-3,4-dione) was measured to be 200±40 pm/V.

scholarly journals Hydrogen production from water electrolysis: role of catalysts

2021 ◽  
Vol 8 (1) ◽  
Author(s):  
Shan Wang ◽  
Aolin Lu ◽  
Chuan-Jian Zhong
Keyword(s):  
Hydrogen Production ◽  
Water Splitting ◽  
Noble Metal ◽  
Active Sites ◽  
Current Knowledge ◽  
Low Cost ◽  
Critical Role ◽  
Water Electrolysis ◽  
Efficient Production ◽  
Production Of Hydrogen

AbstractAs a promising substitute for fossil fuels, hydrogen has emerged as a clean and renewable energy. A key challenge is the efficient production of hydrogen to meet the commercial-scale demand of hydrogen. Water splitting electrolysis is a promising pathway to achieve the efficient hydrogen production in terms of energy conversion and storage in which catalysis or electrocatalysis plays a critical role. The development of active, stable, and low-cost catalysts or electrocatalysts is an essential prerequisite for achieving the desired electrocatalytic hydrogen production from water splitting for practical use, which constitutes the central focus of this review. It will start with an introduction of the water splitting performance evaluation of various electrocatalysts in terms of activity, stability, and efficiency. This will be followed by outlining current knowledge on the two half-cell reactions, hydrogen evolution reaction (HER) and oxygen evolution reaction (OER), in terms of reaction mechanisms in alkaline and acidic media. Recent advances in the design and preparation of nanostructured noble-metal and non-noble metal-based electrocatalysts will be discussed. New strategies and insights in exploring the synergistic structure, morphology, composition, and active sites of the nanostructured electrocatalysts for increasing the electrocatalytic activity and stability in HER and OER will be highlighted. Finally, future challenges and perspectives in the design of active and robust electrocatalysts for HER and OER towards efficient production of hydrogen from water splitting electrolysis will also be outlined.

scholarly journals Molecular Engineering for High-Performance Fullerene Broadband Photodetector

2021 ◽  
Author(s):  
Mingming Su ◽  
Yajing Hu ◽  
Ao Yu ◽  
Zhiyao Peng ◽  
Wangtao Long ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Low Temperature ◽  
Electron Acceptor ◽  
Photoinduced Electron Transfer ◽  
High Performance ◽  
Organic Molecules ◽  
Low Cost ◽  
Molecular Engineering ◽  
Temperature Requirement ◽  
High Flexibility

Broadband photodetectors fabricated with organic molecules have the advantages of low cost, high flexibility, easy processing and low-temperature requirement. Fullerene molecules, due to the electron acceptor and photoinduced electron transfer...

Sign in / Sign up

Export Citation Format

Share Document