A5027502919- Advanced Photocatalysis Techniques
- Copper-based nanomaterials and applications
- TiO2 Photocatalysis and Solar Cells
- Perovskite Materials and Applications
- CO2 Reduction Techniques and Catalysts
- 2D Materials and Applications
- Plasmonic and Surface Plasmon Research
- Gold and Silver Nanoparticles Synthesis and Applications
- Optical Coatings and Gratings
- Quantum Dots Synthesis And Properties
- Advanced biosensing and bioanalysis techniques
- nanoparticles nucleation surface interactions
- Photonic and Optical Devices
- Water Quality Monitoring and Analysis
- Photonic Crystals and Applications
- Carbon and Quantum Dots Applications
- Gas Sensing Nanomaterials and Sensors
- Advanced Cellulose Research Studies
- Advanced Nanomaterials in Catalysis
- ZnO doping and properties
- Spectroscopy and Quantum Chemical Studies
- melanin and skin pigmentation
- Analytical Chemistry and Sensors
- Biochemical Analysis and Sensing Techniques
- Nonlinear Optical Materials Studies
University of Alberta
2018-2024
University of Tehran
2018
Modification of carbon nitride based polymeric 2D materials for tailoring their optical, electronic and chemical properties various applications has gained significant interest. The present report demonstrates the synthesis a novel modified framework with remarkable 3:5 C:N stoichiometry (C3N5) an bandgap 1.76 eV, by thermal deammoniation melem hydrazine precursor. Characterization revealed that in C3N5 polymer, two s-heptazine units are bridged together azo linkage, which constitutes...
Cu/TiO2 is a well-known photocatalyst for the photocatalytic transformation of CO2 into methane. The formation C2+ products such as ethane and ethanol rather than methane more interesting due to their higher energy density economic value, but C–C bonds currently major challenge in photoreduction. In this context, we report dominant C2 product, namely, ethane, from gas-phase photoreduction using TiO2 nanotube arrays (TNTAs) decorated with large-sized (80–200 nm) Ag Cu nanoparticles without...
The harvesting of hot carriers produced by plasmon decay to generate electricity or drive a chemical reaction enables the reduction thermalization losses associated with supra-band gap photons in semiconductor photoelectrochemical (PEC) cells. Through broadband light, hot-carrier PEC devices also produce sensitizing effect heterojunctions wide-band metal oxide semiconductors possessing good photostability and catalytic activity but poor absorption visible wavelength photons. There are...
A fluorine-doped, chlorine-intercalated carbon nitride (CNF-Cl) photocatalyst has been synthesized for simultaneous improvements in light harvesting capability along with suppression of charge recombination bulk g-C
The substitution of time- and labor-intensive empirical research as well slow finite difference time domain (FDTD) simulations with revolutionary techniques such artificial neural network (ANN)-based predictive modeling is the next trend in field nanophotonics. In this work, we demonstrated that networks proper architectures can rapidly predict far-field optical response core-shell plasmonic metastructures. results obtained are comparable FDTD accuracy but speed obtaining them between...
Solar energy harvesting using semiconductor photocatalysis offers an enticing solution to two of the biggest societal challenges, scarcity and environmental pollution. After decades effort, no photocatalyst exists which can simultaneously meet demand for excellent absorption, high quantum efficiency photochemical resilience/durability. While CdS is hydrogen evolution, pollutant degradation organic synthesis, photocorrosion leads deactivation catalyst. Surface passivation with 2D graphitic...
The lack of active, stable, earth-abundant, and visible-light absorbing materials to replace plasmonic noble metals is a critical obstacle for researchers in developing highly efficient cost-effective photocatalytic systems. Herein, core–shell nanotube catalyst was fabricated consisting atomic layer deposited HfN shell anodic TiO2 support with full-visible regime photoactivity photoelectrochemical water splitting. active has two unique characteristics: (1) A large bandgap between optical...
The photocatalytic potential of large area CVD grown nitrogen doped graphene (NGr) has been explored though the chemical transformation 4-nitrobenzene thiol into p,p'-dimercaptoazobenzene. Decoration NGr with Ag nanocubes rounded edges to form NGr/Ag nanohybrids resulted in a slight increase work-function and decrease n-type character due ground state transfer negative charge from Ag. exhibited localized surface plasmon resonance (LSPR) at ~425 nm. When were illuminated visible light...
Octacarboxylated cobalt phthalocyanine (CoPc) was covalently conjugated to cellulose nanocrystals (CNCs) by employing an esterification protocol. Solid-state NMR, X-ray photoelectron spectroscopy (XPS), Raman, and infrared spectra were used verify study the nature of covalent attachment responsible for immobilization CoPc on CNC surface. The investigated from a theoretical simulation perspective using dispersion-corrected density functional theory (DFT) calculations, which verified stable...
Abstract Coinage metal nanoparticles (NPs) enable plasmonic catalysis by generating hot carriers that drive chemical reactions. Making NPs porous enhances the adsorption of reactant molecules. We present a dewetting and dealloying strategy to fabricate gold (Au-Sponge) compare their CO 2 photoreduction activity with respect conventional nanoisland (Au-Island) morphology. Porous exhibit an unusually broad red-shifted plasmon resonance which is in agreement results finite difference time...
Cu2O is a promising earth-abundant semiconductor photocathode for sunlight-driven water splitting. Characterization results are presented to show how the photocurrent density (Jph), onset potential (Eonset), band edges, carrier (NA), and interfacial charge transfer resistance (Rct) affected by morphology method used deposit on copper foil. Mesoscopic planar morphologies exhibit large differences in values of NA Rct. However, these not observed translate other photocatalytic properties Cu2O....
The application domain of deep learning (DL) has been extended into the realm nanomaterials, photochemistry, and optoelectronics research. Here, we used combination a computer vision technique, namely convolutional neural network (CNN), with multilayer perceptron (MLP) to obtain far-field optical response at normal incidence (along cylinder axis) concentric cylindrical plasmonic metastructures such as nanorods nanotubes. Nanotubes Si, Ge, TiO2 coated on either their inner wall or both outer...
Gold nanoparticles (Au NPs) coated with TiO2 shells exhibit strong localized surface plasmon resonance (LSPR) peaks at ~550-600 nm. The Au plasmons decay in femtoseconds through both interband and intraband damping processes to produce hot electron-hole pairs. These carriers have excess energy room temperature which can be utilized generate electricity or drive a chemical reaction. However, the experience ultrafast recombination thermal relaxation hundreds of few picoseconds due...