A5072449022- Gas Sensing Nanomaterials and Sensors
- Carbon Nanotubes in Composites
- Transition Metal Oxide Nanomaterials
- Diamond and Carbon-based Materials Research
- Analytical Chemistry and Sensors
- ZnO doping and properties
- Advanced Chemical Sensor Technologies
- Force Microscopy Techniques and Applications
- Electrochemical Analysis and Applications
- Advanced Photocatalysis Techniques
- Electrochemical sensors and biosensors
- Mechanical and Optical Resonators
- Graphene research and applications
- Perovskite Materials and Applications
- Pigment Synthesis and Properties
- Laser-Ablation Synthesis of Nanoparticles
- Luminescence Properties of Advanced Materials
- Nanowire Synthesis and Applications
- Nonlinear Optical Materials Studies
- Nanotechnology research and applications
Universidade Federal do Ceará
2010-2020
Universidade Estadual de Campinas (UNICAMP)
2012-2015
This paper reports a study of vibrational, structural and morphological properties molybdenum oxide nanoribbons. Temperature‐dependent Raman spectroscopy measurements in MoO 3 nanoribbons revealed changes the 150–350 °C temperature range. No phase transitions were observed, thus showing that orthorhombic is stable from room (nanoribbons) up to 650 (bulk‐like phase) where large plates have been formed by coalescence The interpretation temperature‐dependent data (wavenumber linewidths)...
Fabrication and testing of micro-reactors for the characterization nanosensors is presented in this work. The reactors have a small volume (100 μl) are equipped with gas input/output channels. They were machined from single piece kovar order to avoid leaks system due additional welding. contact pins electrically insulated body reactor using borosilicate sealing glass was hermetically sealed lid an elastomeric o-ring. One advantages lies its simple assembly ease use any vacuum/gas system,...
We report the design and fabrication of microreactors sensors based on metal nanoparticle-decorated carbon nanotubes. Titanium adhesion layers gold films were sputtered onto Si/SiO 2 substrates for obtaining electrical contacts. The electrochemically thickened until 1 <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" id="M1"><mml:mrow><mml:mi>μ</mml:mi></mml:mrow></mml:math>m electrodes patterned using photolithography wet chemical etching. Before dielectrophoretic deposition...
In this work we used a new approach for electrical contact improvement between multi-wall carbon nanotubes and metallic electrodes by localized laser heating. The were suspended, using the dielectrophoresis technique, over gap of 1μm width 5μm depth connecting ends patterned electrodes. Subsequently, as deposited directly heated, in ambient atmosphere, having wavelength 473nm. Raman signal nanotubes, through its G band displacement, was to determine process temperature parameter controlled...
A new approach to improve the electrical and thermal contacts between multi-walled carbon nanotubes metallic electrodes was developed by using spatially localized laser heating coupled with a micro Raman equipment. After deposition dielectrophoresis, were heated in ambient atmosphere focused beam order of nanostructures different (W, Ti Au) also excite signal nanotubes. The changes vibrational frequencies bands provides real time feedback treatment conditions allowing estimate local...
In this work, we report the fabrication of micro-reactors for characterization nano-sensors based on suspended nanoparticle-decorated carbon nanotubes (CNTs/NPs). The capsules were fabricated from a single Kovar® piece, having small volume chamber (100µl). Gold thin films sputtered onto Si/SiO 2 substrates and electrodes patterned using electrochemical deposition, photolithography wet chemical corrosion. order to obtain devices nanotubes, prior CNTs 1µm wide 5µm deep gap was milled in...
In this work, we report design and fabrication of micro-sensors reactors based on nanoparticledecorated carbon nanotubes.The reactors, having a volume 100μl, were machined from one single Kovar ® piece in order to avoid leaks the system due additional welding.The connections for controlling pressure atmosphere working chamber are provided by 1/4" Swagelok tubes placed at diametrically opposite positions testing chamber.The contacts electrically insulated metallic body reactor using...