A5029250882- Crystallization and Solubility Studies
- X-ray Diffraction in Crystallography
- Polyoxometalates: Synthesis and Applications
- Gold and Silver Nanoparticles Synthesis and Applications
- Metal-Organic Frameworks: Synthesis and Applications
- Lanthanide and Transition Metal Complexes
- Vanadium and Halogenation Chemistry
- Advanced Nanomaterials in Catalysis
- Crystallography and molecular interactions
- Protein Interaction Studies and Fluorescence Analysis
- Biosensors and Analytical Detection
- Magnetism in coordination complexes
- Metal complexes synthesis and properties
- Spectroscopy Techniques in Biomedical and Chemical Research
- Nonlinear Optical Materials Research
- Nanocluster Synthesis and Applications
- Chemical Synthesis and Reactions
- Radioactive element chemistry and processing
- Advanced biosensing and bioanalysis techniques
- Dendrimers and Hyperbranched Polymers
- Quantum Dots Synthesis And Properties
- Graphene and Nanomaterials Applications
- Microplastics and Plastic Pollution
- Crystal structures of chemical compounds
- Recycling and Waste Management Techniques
University of Aveiro
2015-2024
Deltares
2024
Beijing Institute of Technology
2018
Universidade Federal do ABC
2018
Japan External Trade Organization
2010
Universidad Autónoma de Madrid
2005
The University of Western Australia
2005
Virginia Commonwealth University
2005
University of Reading
2002
University of Toledo
2001
Graphene sheets, which possess unique nanostructure and a variety of fascinating properties, are considered as promising nanoscale building blocks new nanocomposites, namely support material for the dispersion metal nanoparticles. One methodologies used to prepare graphene sheets is chemical exfoliation graphite in aqueous medium, produces oxygen functionalized sheets. Here, we show that presence functionalities at surface provides reactive sites nucleation growth gold Gold nanoparticles...
This review focuses on recent developments in hybrid and nanostructured substrates for SERS (surface-enhanced Raman scattering) studies. Thus composed of at least two distinct types materials, which one is a active metal, are considered here aiming their use as platforms chemical detection variety contexts. Fundamental aspects related to the effect plasmonic behaviour nanometals briefly introduced. The materials described include polymer nanocomposites containing metal nanoparticles coupled...
New lanthanide complexes of 3-hydroxypicolinic acid (HpicOH) were prepared: [Ln(H2O)(picOH)2(μ-HpicO)]·3H2O (Ln = Eu, Tb, Er). The characterized using photoluminescence, infrared, Raman, and 1H NMR spectroscopy, elemental analysis. crystal structure [Eu(H2O)(picOH)2(μ-HpicO)]·3H2O 1 was determined by X-ray diffraction. Compound crystallizes in a monoclinic system with space group P21/c cell parameters 9.105(13) Å, b 18.796(25) c 13.531(17) β 104.86(1) deg. 3-hydroxypicolinate ligands...
Novel three-dimensional lanthanide−organic frameworks with 2,5-pyridinedicarboxylic (2,5-H2pdc) and 1,4-phenylenediacetic acids (1,4-H2pda) were synthesized by hydrothermal synthesis, characterized structurally using single-crystal powder X-ray diffraction, elemental thermogravimetric analyses, FT-IR photoluminescence spectroscopies, diffuse reflectance. The structural details of [Ln2(2,5-pdc)2(1,4-pda)(H2O)2] [where Ln3+ = Eu3+, Tb3+, (Eu0.2Tb0.8)3+ (Eu0.1Tb0.9)3+] the dehydrated...
Abstract Synthetic Ag‐bacterial cellulose nanocomposites are reported here and their performance as surface enhanced Raman scattering (SERS) substrates was investigated using thiosalicylic acid 2,2′‐dithiodipyridine analytes. These nanocomposite materials act natural sponges when immersed in aqueous or ethanolic solutions allowing capture SERS detection of certain dissolved molecules. The limits for the above organic analytes reached concentrations low 10 −4 mol·dm −3 considerably lower than...
The hydrothermal reaction between lanthanide nitrates and 2,3-pyrazinedicarboxylic acid led to a new series of two-dimensional (2D) lanthanide-organic frameworks: [Ln2(2,3-pzdc)2(ox)(H2O)2]n [where 2,3-pzdc2− = 2,3-pyrazinedicarboxylate, ox2− oxalate, Ln(III) Ce, Nd, Sm, Eu, Gd, Tb, or Er]. structural details these materials were determined by single-crystal X-ray diffraction (for Ce3+ Nd3+) that revealed the formation layered structure. Cationic monolayers {∞2[Ln(2,3-pzdc)(H2O)]+} are...
Triazoles are well-known organic corrosion inhibitors of copper. 1H-1,2,3-Triazole and 1,2,4-triazole, two very simple molecules with the only difference being positions nitrogen atoms in triazole ring, were studied this work as copper 50 mM NaCl solution using a set electrochemical analytical techniques. The results tests indicate that 1H-1,2,3-triazole exhibited superior inhibitor properties but could not suppress anodic dissolution at moderate potentials (>+300 mV SCE), while although it...
A range of bismuth(III) dithiocarbamato complexes were prepared and characterized. The X-ray crystal structures the compounds [Bi{S2CN(CH3)(C6H13)}3] (1) [Bi{S2CN(CH3)(C6H13)}3(C12H8N2)] (2) are reported. preparation Bi2S3 particulates using a wet chemical method involving thermalysis Bi(III) dialkyldithiocarbamato is described. influence several experimental parameters on optical morphological properties powders was investigated. Nanosized colloids obtained having long-term stability...
Hydrophobic substrates for surface-enhanced Raman scattering (SERS) of adsorbate species are great interest in chemical analysis because they can concentrate the analyte molecules a small area surface, thereby improving SERS sensitivity. Here, we propose general strategy to fabricate hydrophobic paper-based applications. The paper have been manufactured by inkjet printing aqueous emulsions containing Ag and polystyrene (PS) colloidal nanoparticles. In first stage, performance was optimized...
2-(Methoxycarbonylmethylsulfanyl)-3,5-dinitrobenzenecarboxylic acid was prepared by nucleophilic substitution. FT-IR and FT-Raman spectra of 2-(methoxycarbonylmethylsulfanyl)-3,5-dinitrobenzenecarboxylic were recorded analyzed. Surface enhanced Raman scattering (SERS) spectrum on a silver colloid. The vibrational wavenumbers computed density functional theoretical (DFT) computations at the B3LYP/6-31G* level they found to be in good agreement with experimental values. Significant...
Photoluminescent lanthanopolyoxotungstate core/shell nanoparticles are prepared by the encapsulation of lanthanide-containing polyoxometalates (POMs) with amorphous silica shells. The preparation morphological well-defined is achieved hydrolysis tetraethoxysilane in presence POMs using a reverse microemulsion method. used decatungstolanthanoates [Ln(W5O18)2]9− type (Ln(III) = Eu, Gd and Tb). Photoluminescence studies show that there efficient emission from POM located inside SiO2 shells,...
A series of nanocomposites based on polyamide (NL16, PA) filter membranes containing metal nanoparticles (NPs) have been prepared by filtration under reduced pressure the colloids. The ensuing materials were then investigated as substrates for surface-enhanced Raman scattering (SERS) imaging studies envisaging spectroscopic detection vestigial organic pollutants dissolved in contaminated water. dye crystal violet (CV) was used here a model pollutant because it is hazardous compound present...
Magnetite nanoparticles (MNPs) decorated with gold nanostars (AuNSs) have been prepared by using a seed growth method without the addition of surfactants or colloidal stabilizers. The hybrid nanomaterials were investigated as adsorbents for uptake tetracycline (TC) from aqueous solutions and subsequent detection surface-enhanced Raman scattering (SERS). Several parameters in order to optimize performance these platforms on SERS TC, including variable pH values effect contact time removal TC....
Fast detection of contaminants emerging concern (CECs) in water resources is great environmental interest. Ideally, sustainable materials should be used quality monitoring technologies implemented for such purposes. In this regard, the application bio-based aimed at fabrication analytical platforms has become importance. This research merges both endeavors by exploring chitosan-coated paper, decorated with silver nanoparticles (AgNPs), on surface-enhanced Raman scattering (SERS) spectroscopy...