A5039816495- Surface Chemistry and Catalysis
- Graphene research and applications
- Molecular Junctions and Nanostructures
- Advanced Chemical Physics Studies
- Electrochemical Analysis and Applications
- Advanced biosensing and bioanalysis techniques
- Surface and Thin Film Phenomena
- Covalent Organic Framework Applications
- Supramolecular Self-Assembly in Materials
- Semiconductor materials and devices
- Catalytic Processes in Materials Science
- DNA and Nucleic Acid Chemistry
- Nanocluster Synthesis and Applications
- Electrochemical sensors and biosensors
- Crystallography and molecular interactions
- Chemical Thermodynamics and Molecular Structure
- Catalysis and Oxidation Reactions
- Photochromic and Fluorescence Chemistry
- Ionic liquids properties and applications
- Gas Sensing Nanomaterials and Sensors
- Advanced Memory and Neural Computing
- nanoparticles nucleation surface interactions
- Nanopore and Nanochannel Transport Studies
- Solid-state spectroscopy and crystallography
- Quantum, superfluid, helium dynamics
Malayer University
2024
University of Mazandaran
2011-2023
Graduate University of Advanced Technology
2021-2023
University of Toronto
2009-2023
Lakehead University
2019-2022
Technical University of Munich
2018-2021
Institut National de la Recherche Scientifique
2015-2020
Centre National pour la Recherche Scientifique et Technique (CNRST)
2015-2019
Varian Medical Systems (Switzerland)
2015-2019
University of Electronic Science and Technology of China
2016-2017
Understanding how molecules interact to form large-scale hierarchical structures on surfaces holds promise for building designer nanoscale constructs with defined chemical and physical properties. Here, we describe early advances in this field highlight upcoming opportunities challenges. Both direct intermolecular interactions those that are mediated by coordinated metal centers or substrates discussed. These can be additive, but they also interfere each other, leading new assemblies which...
Surface-confined polymerization via Ullmann coupling is a promising route to create one- and two-dimensional covalent π-conjugated structures, including the bottom-up growth of graphene nanoribbons. Understanding mechanism reaction necessary provide platform for rationally controlling formation these materials. We use fast X-ray photoelectron spectroscopy (XPS) in kinetic measurements epitaxial surface 1,4-dibromobenzene on Cu(110) devise model based mean field rate equations, involving...
Ullmann coupling is the most common approach to form surface-confined one- and two-dimensional conjugated structures from haloaryl derivatives. The dimensions of formed nanostructures can be controlled by number location halogens within molecular precursors. Our study illustrates that type halogen plays an essential role in design, orientation, extent organometallic polymeric nanostructures. We performed a comparative analysis five 1,4-dihalobenzene molecules containing chlorine, bromine,...
We show that the surface-supported two-dimensional covalent organic framework (COF) known as COF-1 can act a host architecture for C60 fullerene molecules, predictably trapping molecules under range of conditions. The fullerenes occupy lattice at solution/solid interface, and in dried films COF-1/fullerene network be synthesized through either drop-deposition solution or by dipstick-type synthesis which is briefly dipped into solution.
The hydrogenation of ethylene on Pt(111) single-crystal surfaces was studied by combining measurements the kinetics reaction using mass spectrometry detection with simultaneous characterization species present surface reflection–absorption infrared spectroscopy. measured us matches past reports same system, zero- and first-order dependence partial pressures hydrogen, respectively, extensive H–D exchange if D2 is used instead H2. takes place in presence an alkylidyne layer, which forms...
Achieving precise control of molecular self-assembly to form designed three-dimensional (3D) structures is a major goal in nanoscale science and technology. Using scanning tunnelling microscopy density functional theory calculations, we show that 2D covalent organic framework (COF-1) can template solution-processed C60 guest molecules several solvent-dependent structural arrangements morphologies via 3D growth process. When 1,2,4-tricholorobenzene used as solvent, template-defined...
Temperature mapping of the different molecular phases tribromoterthienobenzene on (111) coinage metals.
Ullmann coupling or, more generally, dehalogenative aryl-aryl coupling, is one of the most widely exploited chemical reactions to obtain one- and two-dimensional polymers on metal surfaces. It generally described as a two-step reaction: (i) dehalogenation, resulting in formation stable intermediate organometallic phase subsequent (ii) C-C coupling. The topology polymer depends number positions halogen atoms haloaromatic precursor, although its orientation order are determined by structure...
Monolayer covalent organic frameworks selectively bind fullerenes and trichlorobenzene at different sites <italic>via</italic> types of interactions.
The growth of glycine film by thermal evaporation on Si(111)7×7 at room temperature has been studied X-ray photoemission. In contrast to common carboxylic acids, is found adsorb dissociatively through cleavage a N–H bond instead O–H bond. intricate evolution the observed N 1s features 399.1, 401.4, and 402.2 eV with increasing thickness demonstrates existence transitional adlayer between first zwitterionic multilayer. This estimated be 1–2 thick characterized presence intermolecular N⋯HO...
The ability of catecholamines to undergo oxidative self-polymerization provides an attractive route for preparation coatings biotechnology and biomedicine applications. However, efforts toward developing a complete understanding the mechanism that underpins polymerization have been hindered by multiple catechol crosslinking reaction pathways occur during reaction. Scanning tunneling microscopy allows investigation small molecules in reduced-complexity environment, providing important insight...
Abstract Development of electrochemical DNA hybridization biosensors based on carbon paste electrode (CPE) and gold nanoparticle modified (NGMCPE) as transducers ethyl green (EG) a new electroactive label is described. Electrochemical impedance spectroscopy cyclic voltammetry techniques were applied for the investigation comparison bare CPE NGMCPE surfaces. Our voltammetric spectroscopic studies showed nanoparticles are enable to facilitate electron transfer between accumulated probe surface...
The mechanism of the hydrogenation olefins catalyzed by metal surfaces was probed using isotope labeling in conjunction with a high-flux effusive molecular beam setup capable sustaining steady-state conversion under well-controlled ultrahigh vacuum (UHV). unique conditions afforded this instrument, namely, single collision regime and impinging frequencies equivalent to pressures mTorr range, led clear identification two competing pathways: multiple H–D exchange channel explained well-known...
DNN inference is time-consuming and resource hungry. Partitioning early exit are ways to run DNNs efficiently on the edge. balances computation load multiple servers, offers quit process sooner save time. Usually, these two considered separate steps with limited flexibility. This work combines partitioning proposes a performance model estimate both latency accuracy. We use this offer best partitioned/early based deployment information user preferences. Our experiments show that flexibility...
The kinetics of the hydrogenation ethylene on platinum surfaces was studied by using high-flux effusive molecular beams and reflection–absorption infrared spectroscopy (RAIRS). It determined that steady-state conversion with probabilities close to unity could be achieved fluxes equivalent pressures in mTorr range high (≥100) H2:C2H4 ratios. RAIRS data suggest reaction probability is possible because such conditions lead removal most ethylidyne layer known form during catalysis. observations...
The catalytic hydrogenation of olefins promoted by transition metals, represented here the conversion ethylene with platinum, was studied under a unique regime representing pressures in mTorr range and single-collision conditions. Isotope labeling used to follow concurrent H-D exchange steps that occur during this conversion. Multiple isotope substitutions were observed resulting ethane products, reflecting operability reversible stepwise mechanism proposed long time ago Horiuti Polanyi. In...