A5039175015- Conducting polymers and applications
- Electrospun Nanofibers in Biomedical Applications
- Advanced Sensor and Energy Harvesting Materials
- Gas Sensing Nanomaterials and Sensors
- ZnO doping and properties
- GaN-based semiconductor devices and materials
- 2D Materials and Applications
- Carbon Nanotubes in Composites
- Supercapacitor Materials and Fabrication
- Semiconductor materials and interfaces
- Graphene research and applications
- Electrochemical sensors and biosensors
- Metal and Thin Film Mechanics
- Analytical Chemistry and Sensors
- Electrohydrodynamics and Fluid Dynamics
- Transition Metal Oxide Nanomaterials
- Molecular Junctions and Nanostructures
- Chalcogenide Semiconductor Thin Films
- MXene and MAX Phase Materials
- Quantum Dots Synthesis And Properties
- Photonic and Optical Devices
- Higher Education and Sustainability
- Advanced Thermoelectric Materials and Devices
- Digital literacy in education
- Solar-Powered Water Purification Methods
University of Puerto Rico at Humacao
2012-2024
Faculdade Única
2024
Universidade do Estado de Mato Grosso
2024
Universidade Federal de Catalão
2024
Universidade Federal do Cariri
2024
University of Pennsylvania
2009-2018
Centro Nacional de Microelectrónica
2009
University of Puerto Rico System
2004
We performed an extensive characterization of electrospinning process to evaluate how the parameters and precursor solution characteristics affect fibers morphology. The work was conducted using solutions with different concentrations polyacrylonitrile (PAN) diluted in a fixed amount N,N/dimethylformamide (DMF). Fibers obtained this can find important applications field nanosensors. electrospun were analyzed as function viscosity, applied voltage distance between needle tip (positive...
O impacto do sedentarismo em pacientes com doenças pulmonares crônicas, especialmente a Doença Pulmonar Obstrutiva Crônica (DPOC), é significativo e tem interferência direta seus respectivos prognósticos. Evidenciamos como inatividade física intensifica limitação funcional, exacerba sintomas compromete qualidade de vida desses pacientes. A reabilitação pulmonar apresentada uma intervenção essencial, destacando o papel exercício físico – aeróbico resistido na melhora da capacidade força...
A Síndrome Obstrutiva da Apneia do sono é uma alteração no fluxo respiratório, normalmente crônico, que afeta bilhões de pessoas mundo, tendo a sua maior incidência em com faixa etária entre 30 e 65 anos, prevalência sexo masculino. Os fatores são os mais diversos: obesidade, alterações anatômicas craniofaciais ou mudanças hormonais naturais, esses impactam diretamente na saúde paciente, principalmente têm hipertensão arterial sistêmica, agrava o caso clínico. De acordo evidências atuais,...
Carbon nanofibers were produced from polyacrylonitrile/N, N-Dimethyl Formamide (PAN/DMF) precursor solution using electrospinning and vacuum pyrolysis at temperatures 773-1273 K for 0.5, 2, 5 h, respectively. Their conductance was determined I-V curves. The length cross-section area of the evaluated optical microscope scanning probe microscopes, respectively, used their electrical conductivity calculation. It found that increases sharply with temperature, considerably time lower 873, 973,...
A green instrument-free approach to (bio)chemical analyses: cellulose acetate-based microwell plates as substitutes plastic plates.
This letter reports the fabrication of a gas sensor based on single tin oxide nanofiber made from dimethyldineodecanoate using electrospinning and metallorganics decomposition techniques. The fabricated has been used to detect moisture methanol gas. It showed high sensitivity both gases response times complete testing system are in range 108-150 s for moisture, 10-38 gas, respectively.
Tin oxide (SnO2) microfibres in the rutile structure were synthesized using electrospinning and metallorganic decomposition techniques. Fibres electrospun from a precursor solution containing 20 mg poly(ethylene oxide) (molecular weight 900 000), 2 ml chloroform 1 dimethyldineodecanoate tin, sintered air for h at 400, 600 800 °C, respectively. Scanning electron microscopy, x-ray diffraction Raman microspectrometry used to characterize fibres. The results showed that fibres are composed of SnO2.
Ultrafine tin oxide (SnO 2 ) fibers having a rutile structure, with diameter ranging from 100 nm to several micrometers, were synthesized using electrospinning and metallorganic decomposition techniques. In this work, we propose precursor solution that is mixture of pure SnO sol made SnCl 4 :H O:C 3 H 7 OH:2‐C OH at molar ratio 1:9:9:6, viscous poly(ethylene oxide) (PEO) (molecular weight 900 000) chloroform (CHCl 200 mg PEO/10 mL CHCl . This allows obtain an appropriate viscosity for the...
Abstract Fibers of the biopolymer poly(lactic acid) ( PLA ) and p‐type semiconducting polymer poly(3‐hexylthiophene) P3HT were fabricated using electrospinning technique at low concentration (5 wt%) in CHCl 3 . The fibers several millimeters long had diameters range 100 nm–4 µm. Nanofibers containing 63%/37% / electroactive, therefore used to construct p–n diodes whose ideality parameter was 2.4 rectification (on/off) ratio 400 ±1 V. These also able sense UV radiation remain operable with an...
CVD grown MoSe2 monolayers were electrically characterized at room temperature in a field effect transistor (FET) configuration using an ionic liquid (IL) as the gate dielectric. During growth, instead of MoO3 powder, ammonium heptamolybdate was used for better Mo control source and sodium cholate added lager growth areas. In addition, high specific capacitance (∼7 μF/cm2) IL dielectric to significantly reduce operating voltage. The device exhibited ambipolar charge transport low voltages...
Porous rutile-structured SnO2 fibres, with their length of several millimetres, diameter from 100 nm to 40 µm and potentials for sensor applications, were synthesized a precursor solution poly(ethylene oxide) (PEO), chloroform (CHCl3) dimethyldineodecanoate tin (C22H44O4Sn) using electrospinning metal–organic decomposition techniques. Fourier-transform infrared spectroscopy, thermogravimetric differential thermal analysis x-ray diffraction used characterize the fibres so as reveal series...
The electrical characterization and ammonia vapor (NH 3 ) response of a p‐Si/n‐poly[benzimidazobenzophenanthroline] (n‐BBL) thin‐film junction diode are reported. presence depletion layer at the n‐BBL/p‐Si interface is verified via capacitance–voltage measurements, built‐in potential ≈1.8 V. Using standard equation for data analysis, turn‐on voltage, rectification ratio, ideality parameter found to be 2 V, 16, 6, respectively. also tested in NH where it retained its asymmetric J – V behavior...
This work addresses the formation of nanofibers (with hundred nanometers) by using electrospinning (electrostatic deposition) aiming at applications as sensors. Different quantities a colloidal dispersion graphite particles were blended with polyacrylonitrile (PAN) and N,N dimethylformamide (DMF), resulting in series solutions carbon concentrations ranging from 0 to 25%. Precipitation was observed depending on concentration added precursor blend. As consequence, relative viscosity decreases,...
A set of uniform carbon microspheres (CSs) whose diameters have the order 0.125 μm to 10 was prepared from aqueous sucrose solution by means hydrothermal carbonization sugar molecules. pressed pellet composed mixing CSs with polyethylene oxide (PEO). Electrical characterization carried out showing Ohmic current-voltage characteristics and temperature-dependent conductivity in range 80 K<T<300 K. The reached a maximum value 0.24 S/cm at 258 dependence on temperature...
Poly(lactic acid)PLA is a biocompatible and biodegradable polyester with lactic acid being byproduct of decomposition. PLA can be produced via processing starch, it mechanically robust environmentally stable has therefore attracted interest in applications such as biomedical implants, controlled drug delivery other kitchen variety commodity products. Making electrically conductive blending conducting polymers will extend its range to include electronic devices sensors. Commercial hard grainy...
Polycrystalline GaN fibers have been produced by the polymer-derived-ceramic (PDC) technique. The wurtzite-polymorphic appear to emerge from complex nucleation and grain growth mechanisms, being mostly unconstrained during initial polymer ceramic conversion. importance of carrier architecture alignment is highlighted towards controlled microstructure.
The carbon nanofibers used in this work were derived from a polyacrylonitrile (PAN)/N, N-dimethyl formamide (DMF) precursor solution using electrospinning and vacuum pyrolysis techniques. Their conductivity, /spl sigma/, was measured at temperatures between 1.9 300 K transverse magnetic field -9 9 T. Zero conductivity sigma/(0,T) found to increase monotonically with the temperature convex versus T curve. Conductivity increases external field, revealing negative magnetoresistance 10 K,...