A5075442699- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Graphene research and applications
- Metal-Organic Frameworks: Synthesis and Applications
- Advanced Electron Microscopy Techniques and Applications
- Electron and X-Ray Spectroscopy Techniques
- 2D Materials and Applications
- Molecular Junctions and Nanostructures
- Electrostatics and Colloid Interactions
- Carbon Nanotubes in Composites
- Advanced Chemical Physics Studies
- Surface Chemistry and Catalysis
- MXene and MAX Phase Materials
- Catalytic Processes in Materials Science
- Covalent Organic Framework Applications
- Ion-surface interactions and analysis
- Diamond and Carbon-based Materials Research
- Electrocatalysts for Energy Conversion
- Carbon dioxide utilization in catalysis
- Hydrocarbon exploration and reservoir analysis
- Pickering emulsions and particle stabilization
- nanoparticles nucleation surface interactions
- Crystallography and molecular interactions
- Ionic liquids properties and applications
- Electronic and Structural Properties of Oxides
University of Nottingham
2016-2025
Park University
2016-2019
Harbin Institute of Technology
2017
Incorporating heteroatoms into the graphene lattice may be used to tailor its electronic, mechanical and chemical properties, although directly observed substitutions have thus far been limited incidental Si impurities P, N B dopants introduced using low-energy ion implantation. We present here heaviest impurity date, namely 74Ge+ ions implanted monolayer graphene. Although sample contamination remains an issue, atomic resolution scanning transmission electron microscopy imaging quantitative...
ConspectusThe main objective of this Account is to assess the challenges transmission electron microscopy (TEM) molecules, based on over 15 years our work in field, and outline opportunities studying chemical reactions under beam (e-beam). During TEM imaging an individual molecule adsorbed atomically thin substrate, such as graphene or a carbon nanotube, e-beam transfers kinetic energy atoms molecule, displacing them from equilibrium positions. Impact triggers bond dissociation various which...
Abstract Strain- and defect-engineering are two powerful approaches to tailor the opto-electronic properties of two-dimensional (2D) materials, but relationship between applied mechanical strain behavior defects in these systems remains elusive. Using first-principles calculations, we study response external h -BN, graphene, MoSe 2 , phosphorene, four archetypal 2D which contain substitutional impurities. We find that formation energy defect structures can either increase or decrease with...
Significance A family of stable porous materials incorporating organic linkers and Cu(II) cations is reported. Their pores can be altered systematically by elongation the ligands allowing a strategy selective pore extension along one dimension. These show remarkable gas adsorption properties with high working capacities for CH 4 (0.24 g −1 , 163 cm 3 −3 at 298 K, 5–65 bar) most system. The mechanism rotation groups in solid state has been analyzed NMR spectroscopy rotational rates transition...
The complex [Zn2(tdc)2dabco] (H2tdc = thiophene-2,5-dicarboxylic acid; dabco 1,4-diazabicyclooctane) shows a remarkable increase in carbon dioxide (CO2) uptake and CO2/dinitrogen (N2) selectivity compared to the nonthiophene analogue [Zn2(bdc)2dabco] (H2bdc benzene-1,4-dicarboxylic terephthalic acid). CO2 adsorption at 1 bar for is 67.4 cm3·g–1 (13.2 wt %) 298 K 153 (30.0 273 K. For [Zn2(bdc)2dabco], equivalent values are 46 (9.0 122 (23.9 %), respectively. isosteric heat of zero coverage...
The desolvated (3,24)-connected metal–organic framework (MOF) material, MFM-160a, [Cu3(L)(H2O)3] [H6L = 1,3,5-triazine-2,4,6-tris(aminophenyl-4-isophthalic acid)], exhibits excellent high-pressure uptake of CO2 (110 wt% at 20 bar, 298 K) and highly selective separation C2 hydrocarbons from CH4 1 bar pressure. Henry's law selectivities 79:1 for C2H2:CH4 70:1 C2H4:CH4 K are observed, consistent with ideal adsorption solution theory (IAST) predictions. Significantly, MFM-160a shows a...
Knowledge of the atomic structure layer-stacked two-dimensional conjugated metal-organic frameworks (2D c-MOFs) is an essential prerequisite for establishing their structure-property correlation. For this, resolution imaging often method choice. In this paper, we gain a better understanding main properties contributing to electron beam resilience and achievable in high-resolution TEM images 2D c-MOFs, which include chemical composition, density, conductivity c-MOF structures. As result,...
The key requirement for a portable store of natural gas is to maximize the amount within smallest possible space. packing methane (CH4) in given storage medium at highest density is, therefore, highly desirable but challenging target. We report microporous hydroxyl-decorated material, MFM-300(In) (MFM = Manchester Framework Material, replacing NOTT designation), which displays high volumetric uptake 202 v/v 298 K and 35 bar CH4 488 77 20 H2. Direct observation quantification location,...
In this perspective we examine recent theoretical developments in methods for calculating the electrostatic properties of charged particles dielectric materials.
An amide-functionalized metal organic framework (MOF) material, MFM-136, shows a high CO2 uptake of 12.6 mmol g–1 at 20 bar and 298 K. MFM-136 is the first example an acylamide pyrimidyl isophthalate MOF without open sites and, thus, provides unique platform to study guest binding, particularly role free amides. Neutron diffraction reveals that, surprisingly, there no direct binding between adsorbed CO2/CH4 molecules pendant amide group in pore. This observation has been confirmed...
We report an approach, named chemTEM, to follow chemical transformations at the single-molecule level with electron beam of a transmission microscope (TEM) applied as both tunable source energy and sub-angstrom imaging probe. Deposited on graphene, disk-shaped perchlorocoronene molecules are precluded from intermolecular interactions. This allows monomolecular be studied in real time reveals chlorine elimination reactive aryne formation key initial stage multistep reactions initiated by 80...
Single dirhenium molecules with changeable metal–metal bond order are formed and imaged in situ using state-of-the-art TEM tech.
Atomic-scale changes can significantly impact heterogeneous catalysis, yet their atomic mechanisms are challenging to establish using conventional analysis methods.
The efforts to increase the active surface area of catalysts led reduction metal particle size, down single atoms.
Developing sustainable, efficient catalysts for the electrocatalytic reduction of CO2 to valuable products remains a crucial challenge. Our research demonstrates that combining tin with nanostructured carbon support leads dynamic interface promoting transformation microparticles nanoparticles directly during reaction, significantly increasing formate production up 5.0 mol h–1 g–1, while maintaining nearly 100% selectivity. Correlative electrochemistry–electron microscopy analysis revealed...
Catalysis of chemical reactions by nanosized clusters transition metals holds the key to provision sustainable energy and materials. However, atomistic behaviour nanocatalysts still remains largely unknown due uncertainties associated with highly labile metal nanoclusters changing their structure during reaction. In this study, we reveal explore nm-sized 14 technologically important in carbon nano test tubes using time-series imaging atomically-resolved transmission electron microscopy...
Theory is developed to address a significant problem of how two charged dielectric particles interact in the presence polarizable medium that dilute solution strong electrolyte. The electrostatic force defined by characteristic parameters for interacting (charge, radius, and constant) (permittivity Debye length), expressed form converging infinite series. limiting case weak screening large inter-particle separation considered, which corresponds small (macro)ions carry constant charge. theory...
The electrostatic deposition of particles has become a very effective route to the assembly many nanoscale materials. However, fundamental limitations process are presented by choice solvent, which can either suppress or promote self-assembly depending on specific combinations nanoparticle/surface/solvent properties. A new development in theory interactions between polarizable objects provides insight into effect solvent have self-assembly. Critical is requirement for minimum charge surface...
Electron beam induced covalent attachment of the radicals polyaromatic molecules to graphene is studied computationally and using transmission electron microscopy.
A strategy for positioning, and loosely connecting, molecules in close proximity using mechanically interlocked handcuffs is described. The demonstrated rylene diimides, creating dimeric structures which two components are linked through pillar[5]arene/imidazolium rotaxanes. Investigation of the resulting demonstrates intriguing new properties that arise from placing these redox active dye together, allowing interactions, whilst to separate as required. In particular we observe excimer...