Synthesis and optical properties of SnO 2 –CuO ..
High-quality single-crystalline SnO2 nanorods were synthesized using a microwave-assisted solution method. The nanorods were characterized using X-ray diffraction (XRD), field-emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), ultraviolet-visible and Raman spectroscopy, Brunauer–Emmett–Teller (BET), and electrical resistance measurements. The XRD pattern indicated the formation of single-phase SnO2 nanorods with rutile structure. FE-SEM and TEM images revealed tetragonal nanorods of about 450–500 nm in length and 60–80 nm in diameter. The nanorods showed a higher BET surface area of 288 m2/g, much higher than that of previously reported work. The Raman scattering spectra indicated a typical rutile phase of the SnO2. The absorption spectrum showed an absorption peak centered at 340 nm, and the band-gap value was found to be 3.64 eV. The gas-sensing properties of the SnO2 nanorods for oxygen gas with different concentrations were measured at room temperature. It was found that the value of resistance increased with the increase in oxygen gas concentration in the test chamber. The SnO2 nanorods exhibited high sensitivity and rapid response-recovery characteristics to oxygen gas, and could detect oxygen concentration as low as 1, 3, 5, and 10 ppm.
Synthesis and Optical Properties of SnO2Structures …
This chapter summarizes the recent new research in our group concerning the microstructures and properties of SnO2 materials, including thin films, nanowires and nanorods.
I have completed my PhD in University of Reims in 2014. My PhD project focused on the evaluation of the efficiency of biocompatible nanoparticles for photodynamic therapy (PDT) and magnetic resonance imaging (MRI) applications. The nanoparticles were loaded with ruthenium complexes for PDT and gadolinium complexes for IRM separately and then together. I join the group of F. Delpech in LPCNO in Toulouse in 2015 as teacher and researcher and I am actually still working with this team as post-doctorant. The team developpes the synthesis of NCs in order to obtain novel optical properties for different applications.
on structural and optical properties of SnO2 ..
A novel template- and surfactant-free low temperature solution-phase method has been successfully developed for the controlled synthesis of ultrathin SnO2 single-crystalline nanorods for the first time. The ultrathin SnO2 single-crystalline nanorods are 2.0 ± 0.5 nm in diameter, which is smaller than its exciton Bohr radius. The ultrathin SnO2 nanorods show a high specific area (191.5 m2 g−1). Such a thin SnO2 single-crystalline nanorod is new in the family of SnO2 nanostrucures and presents a strong quantum confinement effect. Its formation depends on the reaction temperature as well as on the concentration of the urea solution. A nonclassical crystallization process, Ostwald ripening process followed by an oriented attachment mechanism, is proposed based on the detailed observations from a time-dependent crystal evolution process. Importantly, such structured SnO2 has shown a strong structure-induced enhancement of gas-sensing properties and has exhibited greatly enhanced gas-sensing property for the detection of ethanol than that of other structured SnO2, such as the powders of nanobelts and microrods. Moreover, these ultrathin SnO2 nanorods exhibit excellent ability to remove organic pollutant in wastewater by enormous surface adsorption. These properties are mainly attributed to its higher surface-to-volume ratio and ultrathin diameter. This work provides a novel low temperature, green, and inexpensive pathway to the synthesis of ultrathin nanorods, offering a new material form for sensors, solar cells, catalysts, water treatments, and other applications.
Optical properties of the products ..
The present work mainly focuses on the
synthesis, characterization and applications of SnO2 thin films and nanowires by using pulsed laser deposition techniques as well as the SnO2 nanorods by using micro-emulsion method.