A5114804289- Gas Sensing Nanomaterials and Sensors
- ZnO doping and properties
- Transition Metal Oxide Nanomaterials
- Ferroelectric and Piezoelectric Materials
- Microwave Dielectric Ceramics Synthesis
- Acoustic Wave Resonator Technologies
- Analytical Chemistry and Sensors
- Electrical and Thermal Properties of Materials
- Multiferroics and related materials
- Photonic and Optical Devices
- Dielectric properties of ceramics
- Advanced ceramic materials synthesis
- Photorefractive and Nonlinear Optics
- Luminescence Properties of Advanced Materials
- Advanced materials and composites
- Advanced Chemical Sensor Technologies
- Water Quality Monitoring and Analysis
- Advancements in Battery Materials
- Electronic and Structural Properties of Oxides
- Semiconductor materials and devices
- Conducting polymers and applications
- Copper-based nanomaterials and applications
- Pigment Synthesis and Properties
- Catalytic Processes in Materials Science
- Advanced Battery Materials and Technologies
Universidade Estadual Paulista (Unesp)
2009-2023
Centro Universitário de Araraquara
2002-2017
Universidade Federal de São Carlos
2003-2014
Instituto de Botânica
2007
Instituto de Tecnología Química
1997-2005
Universidade de São Paulo
2005
American Ceramic Society
1983-2002
University of Washington
1983
Abstract The development of gas sensors with innovative designs and advanced functional materials has attracted considerable scientific interest given their potential for addressing important technological challenges. This work presents new insight towards the high‐performance p‐type semiconductor sensors. Gas sensor test devices, based on copper (II) oxide (CuO) unique (urchin‐like, fiber‐like, nanorods), are prepared by a microwave‐assisted synthesis method. crystalline composition,...
Silver molybdate (Ag 2 MoO 4 ) and silver tungstate WO nanomaterials were prepared using two complementary methods, microwave assisted hydrothermal synthesis (MAH) (pH 7, 140 °C) co-precipitation 4, 70 °C), then used to prepare core/shell composites, namely α-Ag / β-Ag (MAH, pH (co-precipitation, °C). The shape size of the microcrystals observed by field emission scanning electron microscopy (FE-SEM), different morphologies such as balls nanorods. These powders characterized X-ray powder...
In this work, electric transport properties of CaCu3Ti4O12 (CCTO) thin films were investigated for resistive switching, rectifying and gas sensor applications. Single phase CCTO produced by polymeric precursor method (PPM) on different substrates their electrical studied. Films LNO/Si have symmetrical non-ohmic current-voltage characteristics, while deposited Pt/Si a highly asymmetrical behavior which is related to metal-semiconductor junction formed at the CCTO/Pt interface. addition,...
A description is given of the nonohmic behavior obtained in (Sn x Ti 1− )O 2 ‐based systems. matrix founded on systems doped with Nb O 5 leads to a low‐voltage varistor system nonlinear coefficient values ∼9. The presence back‐to‐back Schottky‐type barrier observed based voltage dependence capacitance. When CoO, presents higher (>30) than does SnO system.
Results on the characterization of photoluminescent CaCu 3 Ti 4 O 12 ‐based films, prepared from a sol–gel precursor and heat treated at 700°C, are reported for first time. The samples showed two emission bands 554 800 nm when excited with 488 Ar‐ion laser. measured room temperature in thin films was attributed to complex vacancy clusters. consisted traces TiO 2 , CuO, CaTiO porous structures an average particle size 50 under atomic force microscopy resolution.
X-ray absorption near edge structure (XANES) and electrical measurements were used to elucidate the local electronic changes of copper(II) oxide (CuO) nanostructures under working conditions. For this purpose, a sample holder layout was developed enabling simultaneous analysis spectroscopic properties sensor material identical operating The influence different carrier gases (e.g., air N2) on CuO behavior reducing conditions (H2 gas) studied analyze how particular gas atmosphere can modify...
MgO compacts were sintered from 900° to 1395°C in dry argon and with 2.3 kPa of water vapor. The surface area pore size distributions measured by mercury porosimetry showed large changes during the first minute sintering, indicating that rearrangement instead coalescence small particles is controlling process early stage. Rearrangement was found be temperature‐dependent extend through initial stage sintering.