A5010419750- Molecular Junctions and Nanostructures
- Surface Chemistry and Catalysis
- Surface and Thin Film Phenomena
- Multiferroics and related materials
- Spectroscopy and Quantum Chemical Studies
- ZnO doping and properties
- Force Microscopy Techniques and Applications
- Advanced biosensing and bioanalysis techniques
- Electrochemical Analysis and Applications
- Ga2O3 and related materials
- Electrochemical sensors and biosensors
- Radiation Detection and Scintillator Technologies
- Gas Sensing Nanomaterials and Sensors
- Conducting polymers and applications
- Gold and Silver Nanoparticles Synthesis and Applications
- Graphene research and applications
- Magnetic Properties and Synthesis of Ferrites
- Advanced Condensed Matter Physics
- Organic Light-Emitting Diodes Research
- CCD and CMOS Imaging Sensors
- Copper-based nanomaterials and applications
- Magneto-Optical Properties and Applications
- TiO2 Photocatalysis and Solar Cells
- Perovskite Materials and Applications
- Chemical and Physical Properties of Materials
Universidade Federal de Sergipe
2007-2022
Centro Universitário FEI
2015
Universidade de São Paulo
2001-2010
Florida International University
1995-1998
Monolayer $2\ensuremath{-}{2}^{\ensuremath{'}}$ bipyridine on Au(111) has been studied by scanning tunneling microscopy as a function of surface charge density. At positive charges, the planar molecules stand vertically and form polymeric chains in which they stack with repeat distance $\ensuremath{\sim}3.3$ \AA{}. The are randomly oriented at low but begin to align parallel density reaches $\ensuremath{\sim}13\ensuremath{\mu}\mathrm{C}/{\mathrm{cm}}^{2}$. transition is fully reversible...
The formation and structure of 2,2'-bipyridine (22BPY) 4,4'-bipyridine (44BPY) monolayers on Au(111) substrate have been studied as a function the potential. At high potentials, both molecules adsorb onto stand vertically with their nitrogen atoms facing Au(111). standing stack, like rolls coins, into polymer-like chains which pack closely in parallel to form ordered monolayers. Decreasing potential critical value, 22BPY become randomly oriented via reversible order−disorder phase...
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIn Situ STM and AFM Study of Protoporphyrin Iron(III) Zinc(II) Protoporphyrins Adsorbed on Graphite in Aqueous SolutionsN. J. Tao, G. Cardenas, F. Cunha, Z. ShiCite this: Langmuir 1995, 11, 4445–4448Publication Date (Print):November 1, 1995Publication History Published online1 May 2002Published inissue 1 November 1995https://doi.org/10.1021/la00011a043Request reuse permissionsArticle Views587Altmetric-Citations83LEARN ABOUT THESE METRICSArticle...
Bromination of commercially available 5,6-dimethyl-1,10-phenanthroline with N-bromosuccinimide led to the formation 5,6-bis(bromomethyl)-1,10-phenanthroline, a new compound, in 33% isolated yield. Conversion brominated compound its corresponding o-quinodimethane intermediate was accomplished by reaction tetrahexylammonium iodide. Reaction this C60 refluxing toluene resulted final product, phenanthrolyl[60]fullerene, 1, 43% Spontaneous self-assembly 1,10-phenanthroline on Au(111) surface...
In this work, silver atoms were deposited by ion sputtering on the surface of diglycidyl ether bisphenol A (DGEBA) epoxy resin cured at 150 °C for 6 hours in air. The films DGEBA and its precursors characterized Raman spectroscopy to identify main functional groups their relationship with atoms. Silver thin 5, 10, 15 20 nm room temperature. Both initial film subsequent analyzed Atomic Force Microscopy (AFM) non-contact mode. also using X-ray diffraction (XRD) AFM results showed formation...
Thin films of pure and Nd doped Y2O3 were prepared following a new sol–gel route on glass substrate. Sets thin in different oxidation densification conditions the effect such morphology, crystallization, surface aspect thermoluminescence (TL) radioluminescence response are analysed. The results indicates that suitable for scintillating devices rather than solid state TL dosimeters.
In this communication we present a new sol–gel route to obtain high quality BaFe12O19 thin films. X-ray analysis confirmed the crystal structure with size of 32 nm. Atomic force microscopy images determined film thickness be around 250 nm and roughness factor less than 40 where grain averaged 150 SQUID magnetometer data shows magnetic behavior similar films grown by other techniques, namely, coercive field (Hc=4kOe), normalized remanence close 0.6 saturation 15 kOe Ms=80emu/cm3.
Recently, p-channel metal-oxide-semiconductor (pMOS) transistors were suggested as fit for the task of detecting and quantifying ionizing radiation dose. Linearity, small detection volume, fast readout, portability, low power consumption attenuation are some pMOS advantages over PIN diode thermoluminiscent dosimeters. A hand-held measurement system using a commercial off-the-shelf pMOSas sensor would have clear advantage due to lower cost incurred by standard technological process. In this...
Fotoeletrodos foram usados para tratar efluentes têxteis sintéticos contaminados com corante azul indantreno.Dois meios de tratamento (NaCl e Na 2 SO 4 ) variações temperatura, pH, densidade corrente, concentrações cloreto.Um método Pechini modificado foi aplicado obter os eletros Ti/Ru (Ti, Ru, Ti 0.5 Ru , 0.75 0.25 contendo nanoparticulas TiO anatase a análise degradação cor realizada.Caracterizações física (microscopia força atômica difratometria raios X) eletroquímica (voltametria...
The biological effects of chemical substitution DNA bases triggered several investigations their physicochemical properties. This paper studies the adsorption behavior a halogenated uracil, 5-fluorouracil (5FU), at electrochemical interface Au(111) and sulfuric acid solution. Upon modulation electric field across interface, four distinct phases could be inferred by means cyclic voltammetry (CV). At negative potentials relative to SCE electrode, limited threshold hydrogen evolution, no...