The Effect of Eu Doping on Microstructure, Morphology and Methanal-Sensing Performance of Highly Ordered SnO2 Nanorods Array

Abstract

Layered Eu-doped SnO2 ordered nanoarrays constructed by nanorods with 10 nm diameters and several hundred nanometers length were synthesized by a substrate-free hydrothermal route using alcohol and water mixed solvent of sodium stannate and sodium hydroxide at 200 °C. The Eu dopant acted as a crystal growth inhibitor to prevent the SnO2 nanorods growth up, resulting in tenuous SnO2 nanorods ordered arrays. The X-ray diffraction (XRD) revealed the tetragonal rutile-type structure with a systematic average size reduction and unit cell volume tumescence, while enhancing the residual strain as the Eu-doped content increases. The surface defects that were caused by the incorporation of Eu ions within the surface oxide matrix were observed by high-resolution transmission electron microscope (HRTEM). The results of the response properties of sensors based on the different levels of Eu-doped SnO2 layered nanoarrays demonstrated that the 0.5 at % Eu-doped SnO2 layered nanorods arrays exhibited an excellent sensing response to methanal at 278 °C. The reasons of the enhanced sensing performance were discussed from the complicated defect surface structure, the large specific surface area, and the excellent catalytic properties of Eu dopant.

Highly Enhanced Efficiency of Planar Perovskite Solar Cells by an Electron Transport Layer Using Phytic Acid–Complexed SnO2 Colloids

“…This image displays sets of rutile SnO 2 crystal (110) lattice fringes and the measured interplanar spacing is 0.339 nm, which is consistent with the standard spectra. [ 33 ] Meanwhile, the selected‐area electron diffraction (SAED) pattern suggests that the PA‐SnO 2 NCs have well‐defined diffraction ring for rutile. Therefore, the crystal structure of SnO 2 is not destroyed by PA complexation, thus proving that phytic acid is not doped in the lattice of SnO 2 .…”

Design of Nanoscaled Surface Morphology of TiO2–Ag2O Composite Nanorods through Sputtering Decoration Process and Their Low-Concentration NO2 Gas-Sensing Behaviors

“…Therefore, the development of highly responsive sensing oxide devices toward specific harmful gases has attracted interest in industry. For the gas sensor applications, one-dimensional (1D) metal oxides usually show better performance in comparison with their thin-film or bulk counterparts because of their high surface-to-volume ratio [3,4,5,6]. In particular, gas sensors based on 1D titanium dioxide (TiO 2 ) nanostructures have received considerable attention because they can be fabricated with diverse chemical and physical methods; moreover, TiO 2 has been shown to be favorable for the detection of diverse harmful gases and volatile organic vapors at elevated temperatures [5,7,8].…”

Enhancement of Acetone Gas-Sensing Responses of Tapered WO3 Nanorods through Sputtering Coating with a Thin SnO2 Coverage Layer

“…Among the various coupling oxides integrated into WO 3 , SnO 2 is also an n-type wide bandgap semiconductor, widely used as a gas-sensing material. It has been used to detect methanol, ethanol, and ethylene glycol gases with desirable sensing performance [14,15,16]. Although improvement in the gas-sensing performance of SnO 2 nanoparticle-decorated monoclinic WO 3 nanosheets and tetragonal SnO 2 -monoclinic WO 3 composite films has been reported [4,6], gas-sensing properties of hexagonally structured WO 3 nanorods coupled with thin coverage layers of SnO 2 have not yet been proposed.…”