A5074155129- Crystallization and Solubility Studies
- X-ray Diffraction in Crystallography
- Advanced Photocatalysis Techniques
- Copper-based nanomaterials and applications
- Electronic and Structural Properties of Oxides
- Inorganic Chemistry and Materials
- Polyoxometalates: Synthesis and Applications
- Metal-Organic Frameworks: Synthesis and Applications
- Perovskite Materials and Applications
- Crystal Structures and Properties
- Ferroelectric and Piezoelectric Materials
- Rare-earth and actinide compounds
- Iron-based superconductors research
- Advanced Condensed Matter Physics
- Microwave Dielectric Ceramics Synthesis
- Multiferroics and related materials
- Magnetism in coordination complexes
- Layered Double Hydroxides Synthesis and Applications
- Topological Materials and Phenomena
- ZnO doping and properties
- Organometallic Complex Synthesis and Catalysis
- Covalent Organic Framework Applications
- Magnetic and transport properties of perovskites and related materials
- Catalytic Processes in Materials Science
- MXene and MAX Phase Materials
North Carolina State University
2016-2025
Baylor University
2024-2025
Iowa State University
1996-2021
Norfolk State University
2006-2016
Pennsylvania State University
2014
Northwest University
2010
Northwestern University
2001-2009
Brockhouse Institute for Materials Research
2006
McMaster University
2006
Youngstown State University
2004
Recent research efforts have been growing into p-type copper(I) based oxides for development of their use in solar energy applications. The interest include the binary Cu2O and a number new ternary CuxMyOz oxides. Both Cu(I)-based many advantages when compared to other well-known such as NiO, III–V, II–VI semiconductors. benefits found within diverse group Cu(I)-containing bandgap sizes that can be tuned from ∼1.2 >3.0 eV, high charge carrier mobility, favorable band energies relative...
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTUnderstanding the Role of Helical Chains in Formation Noncentrosymmetric SolidsPaul A. Maggard, Charlotte L. Stern, and Kenneth R. PoeppelmeierView Author Information Department Chemistry Northwestern University Evanston, Illinois 60208-3113 Cite this: J. Am. Chem. Soc. 2001, 123, 31, 7742–7743Publication Date (Web):July 11, 2001Publication History Received20 April 2001Revised15 June 2001Published online11 July inissue 1 August...
Synthesis of SrTiO3-coated BiFeO3 (see Figure) and Fe2O3 metal-oxide particles has been performed using low-temperature hydrothermal techniques. The coated materials suggest a promising new general strategy for the sensitization UV-active metal oxide photocatalysts to visible light.
Three new silver-vanadate hybrid solids, [Ag(bpy)]4V4O12 x 2 H2O (I), [Ag(dpa)]4V4O12 4 (II), and Ag4(pzc)2V2O6 (III) (bpy = 4,4'-bipyridine, dpa 1,2-bis(4-pyridyl)-ethane, pzc pyrazinecarboxylate), were synthesized by hydrothermal methods characterized using single crystal X-ray diffraction (I, P2(1)/c, Z 4, a 11.375(2) A, b 14.281(4) c 13.598(3) beta 91.46(1) degrees; II, 8, 13.5748(3) 15.3372(4) 14.1854(3) 114.1410(9) III, P1, 2, 3.580(1) 11.839(4) 19.321(7) alpha 89.110(7) degrees,...
A new p-type CuNb3O8 polycrystalline photoelectrode was investigated and determined to have indirect direct bandgap sizes of 1.26 1.47 eV, respectively. The film could be prepared on fluorine-doped tin oxide glass yielded a cathodic photocurrent under visible-light irradiation (λ > 420 nm) with incident photon-to-current efficiencies up ∼6-7% concomitant hydrogen evolution. Mott-Schottky analysis flat band potential +0.35 V versus RHE (pH = 6.3) calculated dopant concentration ∼7.2 × 10(15)...
Flux crystal growth of mixed-metal oxide photocatalysts with (A) rod- and (B) platelet-shaped morphologies grown under varied flux conditions.
Toward our goal of scalable, antimicrobial materials based on photodynamic inactivation, paper sheets comprised photosensitizer-conjugated cellulose fibers were prepared using porphyrin and BODIPY photosensitizers, characterized by spectroscopic (infrared, UV–vis diffuse reflectance, inductively coupled plasma optical emission) physical (gel permeation chromatography, elemental, thermal gravimetric analyses) methods. Antibacterial efficacy was evaluated against Staphylococcus aureus...
The rising significance of producing useful chemical fuels from sunlight has motivated an upsurge photochemical research, as shown by the growing diversity chromophores, redox catalysts, and reactivity studies. However, their synergistic integration within artificial photosynthetic systems requires shareable platforms. Early transition-metal oxides have exhibited effective chromophoric/electronic properties across many systems, which enabled outstanding photocatalytic water splitting...
A new p-type CuNbO3 photoelectrode was prepared on fluorine-doped tin oxide (FTO) glass and characterized by X-ray diffraction (XRD), UV–vis spectroscopy, photoelectrochemical techniques. Solid-state syntheses yielded a red-colored phase (space group: C2/m (No. 12), Z = 8, 9.525(1) Å, b 8.459(2) c 6.793(1) β 90.9(2)°) with measured optical bandgap size of ∼2.0 eV. Phase-pure samples could be deposited annealed FTO slides at 400 °C under vacuum. Photoelectrochemical measurements showed the...
Formation of surface nanoparticles on p-type Cu<sub>3</sub>VO<sub>4</sub> (shown) and their critical role in enhancing its photocurrents for solar energy conversion.
The n-type Sn2TiO4 phase was synthesized using flux methods and found to have one of the smallest visible-light bandgap sizes known that also maintains suitable conduction valence band energies for driving photocatalytic water-splitting reactions. either a SnCl2 or SnCl2/SnF2 peritectic in 2:1 flux-to-precursor ratio heated at 600 400 °C 24 h, respectively. two types salt fluxes resulted large rod-shaped particles smaller tetragonal prism-shaped °C. Surface photovoltage spectroscopy...
Carbon nitride materials can be hosts for transition metal sites, but Mössbauer studies on iron complexes in carbon nitrides have always shown a mixture of environments and oxidation states. Here we describe the synthesis characterization crystalline with stoichiometric sites that all same environment. The material (formula C6N9H2Fe0.4Li1.2Cl, abbreviated PTI/FeCl2) is derived from reacting poly(triazine imide)·LiCl (PTI/LiCl) low-melting FeCl2/KCl flux, followed by anaerobic rinsing...
The visible-light photocatalyst PbTiO3 was prepared in molten NaCl and PbO fluxes using 0.5:1–20:1 flux-to-reactant molar ratios by heating to 1000°C for a duration of 1 h. Yellow-colored powders were obtained high purity, as confirmed powder X-ray diffraction exhibited bandgap size ∼2.75 eV determined UV–Vis diffuse reflectance measurements. Roughly spherical cubic shaped particles with homogeneous microstructures observed sizes ranging from ∼100 6 000 nm, surface areas 0.56 2.63 m2/g....
A new solid solution has been prepared in the system LiNb3O8–CuNb3O8, and impacts of chemical composition crystal structure have investigated for resulting band gap sizes photocatalytic activities water reduction to hydrogen under visible light. All members were synthesized by solid-state methods within evacuated fused-silica vessels, their phase purities confirmed via powder X-ray diffraction techniques (space group P21/a, a = 15.264(5)–15.367(1) Å, b 5.031(3)–5.070(1) c 7.456(1)–7.536(8) β...
ConspectusMany small bandgap semiconductors have been discovered or predicted to exist beyond the edges of stability, that is, accessible only as metastable solids are thermodynamically unstable. In many cases, these revealed technologically promising properties for solar energy conversion, such in photocatalysis photovoltaics. This Account presents a review research results selected from my group and others recent years on semiconductors. Notably, include chemical systems mixed-metal oxides...
We report the development of a hybrid catalyst consisting carbon nitride (CNx) and cobalt phthalocyanine tetracarboxylic acid (CoPc-COOH), which converts CO2 to CO with high reaction rate (1067 μmol/g·h) selectivity (over 98%), under simulated solar irradiation. The carboxylic substituents on ligands play critical role as they bind amine groups CNx enable nearly ideal monolayer coverage molecular cocatalyst semiconductor surface promote catalytic activity from complex. Specifically,...
Eu(II)-containing chalcogenides are an emerging class of materials that high interest due to their optical activity and intriguing magnetism. Here, we synthesized Eu2SiSe4 as red-colored single crystals characterized its structure with crystal X-ray diffraction, confirming the reported chiral monoclinic P21 symmetry at room temperature. The comprises distorted SiSe4 tetrahedral units charge-balancing Eu(II) cations. We find second harmonic generation (SHG) (~7x AGS) polycrystalline be among...
The strategy of incorporating earth-abundant catalytic centers into light-absorbing architectures is desirable from the viewpoint low cost, toxicity, and versatility at activating small molecules to produce solar-based fuels. Herein, we show that an Fe-bearing quaterpyridine molecular species can be anchored a light-absorbing, crystalline, carbon nitride, i.e., yielding molecular-catalyst/material hybrid capable facilitating selective CO2 reduction in aqueous solution. This material...