A5010328804- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Conducting polymers and applications
- Chemical Synthesis and Characterization
- Electrochemical Analysis and Applications
- Electrochemical sensors and biosensors
- Quantum Dots Synthesis And Properties
- Analytical Chemistry and Sensors
- Photochromic and Fluorescence Chemistry
- Fuel Cells and Related Materials
- Chalcogenide Semiconductor Thin Films
- Advanced Fluorescence Microscopy Techniques
- Electrocatalysts for Energy Conversion
- Perovskite Materials and Applications
- Synthesis and characterization of novel inorganic/organometallic compounds
- Copper-based nanomaterials and applications
- Molecular Junctions and Nanostructures
- Organometallic Complex Synthesis and Catalysis
- Electronic and Structural Properties of Oxides
- N-Heterocyclic Carbenes in Organic and Inorganic Chemistry
- Biotin and Related Studies
- Synthesis and properties of polymers
- Luminescence and Fluorescent Materials
- TiO2 Photocatalysis and Solar Cells
- Photochemistry and Electron Transfer Studies
University of Puerto Rico at Río Piedras
2006-2023
Centre Hospitalier Universitaire Pointe-à-Pitre
2021-2023
University of Science and Technology
2023
Nueva Ecija University of Science and Technology
2023
Ana G. Mendez University System
2019-2022
Taipei City Government
2021
Science Oxford
2019
Universidad Metropolitana
2012-2016
Cornell University
2009-2011
University of Puerto Rico at Cayey
2010
We report the design, fabrication, and characterization of colloidal PbSe nanocrystal (NC)-based photovoltaic test structures that exhibit an excitonic solar cell mechanism. Charge extraction from NC active layer is driven by a photoinduced chemical potential energy gradient at nanostructured heterojunction. By minimizing perturbation to levels thereby gaining insight into "intrinsic" properties charge transfer mechanism NC, we show direct correlation between interfacial level offsets device...
Quenching of fluorophores by the same proteins that they covalently label is a phenomenon neither well-known nor well-characterized. It often assumed are unperturbed their target proteins. However, it has been observed attached can be quenched contact with amino acids within protein, and this property exploited to report on changing conformational states or intramolecular dynamics We show in communication fluorescence Alexa dyes is, fact, interactions Trp, Tyr, Met, His residues through...
We have investigated the conductance of individual optically switchable dithienylethene molecules in both their conducting closed configuration and nonconducting open configuration, using technique repeatedly formed break-junctions. employed pyridine groups to link gold electrodes order achieve relatively well-defined molecular contacts stable conductance. For form each molecule, we observed a peak histogram constructed without any data selection, allowing us determine fully stretched...
The direct intercalation reaction of ferrocene (bis(η5-cyclopentadienyl)iron(II), Fc) with a highly hydrated layered zirconium phosphate (ZrP) resulted in the formation ferrocenium ion (Fc+) within ZrP material. Fc+-intercalated material has an interlayer distance 10.7 Å. intercalated was used as electron acceptor for oxidation both ferro-cytochrome c and excited state tris(2,2'-bipyridine)ruthenium(II) ([Ru(bpy)3]2+). Upon contact 1.5 × 10-5 M solution c, UV−vis absorption spectrum shows...
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication the EditorNEXTSemiperfluoroalkyl Polyfluorenes for Orthogonal Processing in Fluorous SolventsJin-Kyun Lee†, Hon Hang Fong†, Alexander A. Zakhidov†, Georgia E. McCluskey‡, Priscilla G. Taylor†, Mitk'el Santiago-Berrios§, Héctor D. Abruña§, Andrew B. Holmes‡, George Malliaras†, and Christopher K. Ober*†View Author Information† Department of Materials Science Engineering, Cornell University, Ithaca, New York 14853‡ School...
We present a carbon paste electrode (CPE) modified using the electron mediator bis(1,10-phenanthroline-5,6-dione) (2,2'-bipyridine)ruthenium(II) ([Ru(phend)(2)bpy](2+)) exchanged into inorganic layered material zirconium phosphate (ZrP). X-Ray powder diffraction showed that interlayer distance of ZrP increases upon [Ru(phend)(2)bpy](2+) intercalation from 10.3 Å to 14.2 Å. The UV-vis and IR spectroscopies results characteristic peaks expected for [Ru(phend)(2)bpy](2+). spectrophotometric...
A series of Werner complexes featuring the tridentate ligand smif, that is, 1,3-di-(2-pyridyl)-2-azaallyl, have been prepared. Syntheses (smif)2M (1-M; M = Cr, Fe) were accomplished via treatment M(NSiMe3)2(THF)n (M n 2; Fe, 1) with 2 equiv (smif)H (1,3-di-(2-pyridyl)-2-azapropene); ortho-methylated (oMesmif)2Fe (2-Fe) and (oMe2smif)2Fe (3-Fe) similarly Metatheses MX2 variants Li(smif) or Na(smif) generated 1-M Mn, Co, Ni, Zn, Ru). Metathesis VCl3(THF)3 a reducing Na/Hg present afforded 1-V,...
Abstract Two different self‐contained ethanol amperometric biosensors incorporating layered [Ru(phend) 2 bpy] 2+ ‐intercalated zirconium phosphate (ZrP) as the mediator well yeast ‐alcohol dehydrogenase ( y‐ ADH) and its cofactor nicotinamide adenine dinucleotide (NAD + ) were constructed to improve upon a design previously reported where only this was immobilized in surface of modified electrode. In first biosensor, ZrP carbon paste electrode (CPE) improved by immobilizing both ADH NAD...
Highly dispersed iron-based quantum dots (QDs) onto powdered Vulcan XC-72R substrate were successfully electrodeposited by the rotating disk slurry electrodeposition (RoDSE) technique. Our findings through chemical physics characterization revealed that continuous electron pathway interaction between interface metal–carbon is controlled. The ring-disk electrode (RRDE) and prototype generation unit (PGU) of in-situ H2O2 in fuel cell experiments a high activity for oxygen reduction reaction...
Semiconductor materials offer several potential benefits as active elements in the development of harvesting-energy conversion technologies. In particular, lead selenide (PbSe) semiconductors have been used and proposed to design solar energy harvesting devices, IR sensors, FET etc. Lead salts drawn particular attention from applied fundamental research communities due their exceptionally strong quantum confinement effects. Several syntheses PbSe using long chain surfactants allow formation...
The direct intercalation reaction of [Co(tpy)(2)](2+) with the highly hydrated θ phase layered zirconium phosphate (θ-ZrP) resulted in formation oxidized [Co(tpy)(2)](3+) ion within ZrP material. X-ray powder diffraction patterns showed that interlayer distance increases from 10.3 Å θ-ZrP to 14.9 dry [Co(tpy)(2)](3+)-intercalated {[Co(tpy)(2)](3+):ZrP} phase. complex remains electroactive layers ZrP. formal potential a carbon paste electrode (CPE) modified [Co(tpy)(2)](3+):ZrP (E°' = 40.8 mV...
Metal oxide semiconductors have attracted much attention due to their versatility in different applications, ranging from biosensing green energy-harvesting technologies. Among these metal oxides, oxide-based diluted magnetic also been proposed for fuel cell especially the oxygen reduction reaction (ORR) and evolution reaction. However, catalytic mechanism has follow a two-electron pathway, forming hydrogen peroxide, instead of four-electron pathway. Herein, we report cobalt-doped zinc...
The study determines the research publication performance of State Universities and Colleges based on Scopus Database.In particular, Nueva Ecija University Science Technology were chosen to be model university this study.The Elsevier database was used retrieve total papers, citations, h-index each university.These data then analyzed during course previous years as well for historical scientific accomplishment.Results shows that a 72 documents are affiliated with 63 authors found in...
Alkaline membrane fuel cells (AMFC) have emerged as an alternative to current technology oxygen reduction reaction (ORR) kinetics improved and alkaline conditions enabled the use of non-precious metal. First row transition metal ferrites, MFe2O4 (M = Co, Mn, Zn) ORR electrocatalysts were prepared by co-precipitation. electrocatalysis was studied for pre- post-calcined samples. polarization curves performed using a rotary disk electrode at 1600 rpm in O2-saturated 1.0 M KOH. The highest onset...
Proton exchange membrane fuel cells (PEMFC) are a promising power technology for vehicles. However, their commercialization has been hindered due to the cathodic process of oxygen reduction reaction (ORR). The ORR usually uses high-cost platinum-based electrocatalysts, which is also major drawback towards commercialization. High overpotential, slow kinetics and irreversibility make most challenging hurdle PEMFC’s. Alkaline (AMFC) have emerge as an alternative PEMFC’s greatly improved in...