Self-assembly of metal atoms (Na, K, Ca) on graphene

Nanoscale ◽  
2015 ◽  
Vol 7 (6) ◽  
pp. 2352-2359 ◽  
Author(s):  
Jian Zhou ◽  
Shunhong Zhang ◽  
Qian Wang ◽  
Yoshiyuki Kawazoe ◽  
Puru Jena
Keyword(s):  
Self Assembly ◽  
Metal Atoms

scholarly journals One-, Two-, and Three-Dimensional Self-Assembly of Atomically Precise Metal Nanoclusters

Nanomaterials ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 1105 ◽  
Author(s):  
Ayano Ebina ◽  
Sakiat Hossain ◽  
Hikaru Horihata ◽  
Shuhei Ozaki ◽  
Shun Kato ◽  
...  
Keyword(s):  
Self Assembly ◽  
Fine Particle ◽  
Three Dimensional ◽  
Chemical Properties ◽  
Design Guidelines ◽  
Metal Nanoclusters ◽  
Functional Nanomaterials ◽  
Physical Chemical ◽  
Metal Atoms ◽  
Fine Particle Size

Metal nanoclusters (NCs), which consist of several, to about one hundred, metal atoms, have attracted much attention as functional nanomaterials for use in nanotechnology. Because of their fine particle size, metal NCs exhibit physical/chemical properties and functions different from those of the corresponding bulk metal. In recent years, many techniques to precisely synthesize metal NCs have been developed. However, to apply these metal NCs in devices and as next-generation materials, it is necessary to assemble metal NCs to a size that is easy to handle. Recently, multiple techniques have been developed to form one-, two-, and three-dimensional connected structures (CSs) of metal NCs through self-assembly. Further progress of these techniques will promote the development of nanomaterials that take advantage of the characteristics of metal NCs. This review summarizes previous research on the CSs of metal NCs. We hope that this review will allow readers to obtain a general understanding of the formation and functions of CSs and that the obtained knowledge will help to establish clear design guidelines for fabricating new CSs with desired functions in the future.

Energetics and kinetics of Cu atoms and clusters on the Si(111)-7 × 7 surface: first-principles calculations

2016 ◽  
Vol 18 (27) ◽  
pp. 18549-18554 ◽  
Author(s):  
Xiao-Yan Ren ◽  
Chun-Yao Niu ◽  
Wei-Guang Chen ◽  
Ming-Sheng Tang ◽  
Jun-Hyung Cho
Keyword(s):  
Thin Film ◽  
Crystal Growth ◽  
First Principles ◽  
Self Assembly ◽  
Catalytic Reactions ◽  
Semiconductor Surface ◽  
First Principles Calculations ◽  
Metal Atoms ◽  
Thin Film Epitaxy ◽  
Kinetics Of

Exploring the properties of noble metal atoms and nano- or subnano-clusters on the semiconductor surface is of great importance in many surface catalytic reactions, self-assembly processes, crystal growth, and thin film epitaxy.

Guided Self-Assembly of Metal Atoms on Silicon Using Organic-Molecule Templating

2012 ◽  
Vol 134 (37) ◽  
pp. 15312-15317 ◽  
Author(s):  
Daniel R. Belcher ◽  
Marian W. Radny ◽  
Steven R. Schofield ◽  
Phillip V. Smith ◽  
Oliver Warschkow
Keyword(s):  
Self Assembly ◽  
Organic Molecule ◽  
Metal Atoms

Recent advances in the self-assembly of polynuclear metal–selenium and –tellurium compounds from 14–16 reagents

2018 ◽  
Vol 4 (2) ◽  
Author(s):  
Alexander M. Polgar ◽  
John F. Corrigan
Keyword(s):  
Self Assembly ◽  
The Self ◽  
Controlled Synthesis ◽  
Metal Chalcogenides ◽  
Group 14 ◽  
Ancillary Ligands ◽  
Metal Atoms ◽  
Functionalized Surfaces ◽  
Group 14 Elements ◽  
Background Material

Abstract The use of reagents containing bonds between group 14 elements and Se or Te for the self-assembly of polynuclear metal–chalcogen compounds is covered. Background material is briefly reviewed and examples from the literature are highlighted from the period 2007–2017. Emphasis is placed on the different classes of 14–16 precursors and their application in the targeted synthesis of metal–chalcogen compounds. The unique properties arising from the combination of specific 14–16 precursors, metal atoms, and ancillary ligands are also described. Selected examples are chosen to underline the progress in (i) controlled synthesis of heterometallic (ternary) chalcogen clusters, (ii) chalcogen clusters with organic functionalized surfaces, and (iii) crystalline open-framework metal chalcogenides.

From single atoms to self-assembled quantum single-atomic nanowires: noble metal atoms on black phosphorene monolayers

2017 ◽  
Vol 19 (11) ◽  
pp. 7864-7870
Author(s):  
X. J. Zhao ◽  
Wen-Wen Shan ◽  
Hao He ◽  
Xinlian Xue ◽  
Z. X. Guo ◽  
...  
Keyword(s):  
Potential Energy ◽  
Potential Energy Surface ◽  
Noble Metal ◽  
Self Assembly ◽  
Energy Surface ◽  
Single Atoms ◽  
Atomic Wires ◽  
Metal Atoms ◽  
Black Phosphorene ◽  
Self Assembled

Self-assembly growth of Pd(Pt)n single atomic wires on black phosphorene due to the anisotropic potential energy surface of the substrate.

Article

1998 ◽  
Vol 76 (11) ◽  
pp. 1654-1659
Author(s):  
F Bensebaa ◽  
T H Ellis ◽  
E Kruus ◽  
R Voicu ◽  
Y Zhou
Keyword(s):  
Self Assembly ◽  
Metal Ion ◽  
Layered Materials ◽  
The Self ◽  
X Ray Diffraction ◽  
X Ray ◽  
Alkyl Chains ◽  
Metal Atoms ◽  
Hexagonal Arrangement ◽  
Key Features

Layered materials composed of metal-alkanethiolate units have been synthesized and characterized. The self-assembly occurs at the interface between a metal-ion-containing aqueous phase and an alkanethiol-containing organic phase. Key features of the structure have been determined from X-ray diffraction and infrared spectroscopy measurements. The highly ordered bilayers are characterized by tilted, all-trans alkyl chains. A new model for the in-plane structure has been presented, which is based on a hexagonal arrangement of metal atoms in the central plane.Key words: self-assembly, alkanethiolates, layered materials, vibrational spectroscopy.

scholarly journals O-coordinated W-Mo dual-atom catalyst for pH-universal electrocatalytic hydrogen evolution

2020 ◽  
Vol 6 (23) ◽  
pp. eaba6586 ◽  
Author(s):  
Yang Yang ◽  
Yumin Qian ◽  
Haijing Li ◽  
Zhenhua Zhang ◽  
Yuewen Mu ◽  
...  
Keyword(s):  
Hydrogen Evolution ◽  
Self Assembly ◽  
Rational Design ◽  
Single Atom ◽  
Electron Delocalization ◽  
Intrinsic Activity ◽  
Metal Atoms ◽  
Doped Graphene ◽  
Dual Atom ◽  
In Virtue Of

Single-atom catalysts (SACs) maximize the utility efficiency of metal atoms and offer great potential for hydrogen evolution reaction (HER). Bimetal atom catalysts are an appealing strategy in virtue of the synergistic interaction of neighboring metal atoms, which can further improve the intrinsic HER activity beyond SACs. However, the rational design of these systems remains conceptually challenging and requires in-depth research both experimentally and theoretically. Here, we develop a dual-atom catalyst (DAC) consisting of O-coordinated W-Mo heterodimer embedded in N-doped graphene (W1Mo1-NG), which is synthesized by controllable self-assembly and nitridation processes. In W1Mo1-NG, the O-bridged W-Mo atoms are anchored in NG vacancies through oxygen atoms with W─O─Mo─O─C configuration, resulting in stable and finely distribution. The W1Mo1-NG DAC enables Pt-like activity and ultrahigh stability for HER in pH-universal electrolyte. The electron delocalization of W─O─Mo─O─C configuration provides optimal adsorption strength of H and boosts the HER kinetics, thereby notably promoting the intrinsic activity.

In vitro and in vivo polysaccharides assembly: ultrastructural and cytochemical study of growing plant cell wall components.

1978 ◽  
Vol 36 (2) ◽  
pp. 434-435
Author(s):  
D. Reis ◽  
B. Vian ◽  
J. C. Roland
Keyword(s):  
Cell Wall ◽  
Self Assembly ◽  
Plant Cell Wall ◽  
Higher Plants ◽  
Three Dimensional ◽  
Cytochemical Study ◽  
Wall Components

Wall morphogenesis in higher plants is a problem still open to controversy. Until now the possibility of a transmembrane control and the involvement of microtubules were mostly envisaged. Self-assembly processes have been observed in the case of walls of Chlamydomonas and bacteria. Spontaneous gelling interactions between xanthan and galactomannan from Ceratonia have been analyzed very recently. The present work provides indications that some processes of spontaneous aggregation could occur in higher plants during the formation and expansion of cell wall.Observations were performed on hypocotyl of mung bean (Phaseolus aureus) for which growth characteristics and wall composition have been previously defined.In situ, the walls of actively growing cells (primary walls) show an ordered three-dimensional organization (fig. 1). The wall is typically polylamellate with multifibrillar layers alternately transverse and longitudinal. Between these layers intermediate strata exist in which the orientation of microfibrils progressively rotates. Thus a progressive change in the morphogenetic activity occurs.

The Nature of Rapidly Extracted Phycocyanin from the Blue-Green Alga Plectonema Boryanum

1971 ◽  
Vol 29 ◽  
pp. 366-367
Author(s):  
M. Kessel ◽  
R. MacColl
Keyword(s):  
Self Assembly ◽  
Analytical Ultracentrifugation ◽  
Uranyl Acetate ◽  
The Self ◽  
Major Protein ◽  
Subunit Structure ◽  
Blue Green Alga ◽  
Thin Sections ◽  
Blue Green Algae ◽  
Cacodylate Buffer

The major protein of the blue-green algae is the biliprotein, C-phycocyanin (Amax = 620 nm), which is presumed to exist in the cell in the form of distinct aggregates called phycobilisomes. The self-assembly of C-phycocyanin from monomer to hexamer has been extensively studied, but the proposed next step in the assembly of a phycobilisome, the formation of 19s subunits, is completely unknown. We have used electron microscopy and analytical ultracentrifugation in combination with a method for rapid and gentle extraction of phycocyanin to study its subunit structure and assembly.To establish the existence of phycobilisomes, cells of P. boryanum in the log phase of growth, growing at a light intensity of 200 foot candles, were fixed in 2% glutaraldehyde in 0.1M cacodylate buffer, pH 7.0, for 3 hours at 4°C. The cells were post-fixed in 1% OsO4 in the same buffer overnight. Material was stained for 1 hour in uranyl acetate (1%), dehydrated and embedded in araldite and examined in thin sections.

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