Low-temperature growth and blue luminescence of SnO2 nanoblades

Abstract

Large-scale SnO2 nanoblades have been synthesized on a glass substrate covered with a 100-nm-thick SnO2 buffer layer in a controlled aqueous solution at temperatures below 100 degrees C. Typical widths of the nanoblades were about 100-300 nm and the lengths were up to 10 mu m, depending on the growth temperature. The thicknesses were about a few tens of nanometers. Transmission electron microscopy data, x-ray diffraction patterns, and x-ray photoelectron spectroscopy spectral analyses confirmed that the as-grown nanoblades had the phase structure of the rutile form of SnO2 growing along the [110] direction. No other impurities, such as elemental Sn and tin oxides, were detected. An intense blue luminescence centered at a wavelength of 445 nm with a full width at half maximum of 75 nm was observed in the as-grown SnO2 nanoblades, which is different from the yellow-red light emission observed in SnO2 nanostructures prepared by other methods. It is believed that the strong blue luminescence from the as-grown SnO2 nanoblades is attributed to oxygen-related defects that have been introduced during the growth process. (c) 2006 American Institute of Physics

Synthesis and purple-blue emission of antimony trioxide single-crystalline nanobelts with elliptical cross section

“…It is worth noting that room temperature ultraviolet (UV) bandedge photoluminescence with a peak at 374 nm has previously been observed for Sb 2 O 3 nanowires [24]. The purple-blue photoluminescence at 425 nm (~2.92 eV) is probably due to a triplet to ground transition of a neutral oxygen vacancy defect, as suggested by ab initio molecular orbital calculations for many other well-studied metal oxides such as ZnO and SnO 2 [42,43]. Considering that the energy gap of bulk Sb 2 O 3 is 3.3 eV, the purple-blue luminescence from Sb 2 O 3 nanobelts can be attributed to oxygen-related defects that have been introduced during growth.…”

Brush-like SnO2/ZnO hierarchical nanostructure: Synthesis, characterization and application in UV photoresponse

“…The lower energy at 530.1 eV corresponds to O 2− in the structure of regular rutile SnO 2 , the binding energy at 531.9 eV can be ascribed to the oxygen vacancies on the SnO 2 nanowire surface. [35][36][37][38][39] The above XPS result indicates the existence of oxygen vacancy defects which will play crucial role in the PL of SnO 2 nanowires. The SEM images of eventually formed SnO 2 /ZnO hierarchical nanostructure are shown in Figure 3(a) and 3(b), the nanostructures have brush-like morphology with a high surface-volume ratio.…”

Microstructural Control of the TiO<SUB>2</SUB>-SnO<SUB>2</SUB> Binary System and Synthesis of SnO<SUB>2</SUB> Nanowhiskers by Microwave Irradiation

“…18) In addition, these 1D nanostructures exhibit light emission in the range of 400-600 nm. [19][20][21][22][23] In this study, we report a method for controlling the various textures (porous, single columnar crystals and nanowhiskers) of the TiO 2 -SnO 2 system using a non-equilibrium reaction field of microwave radiation.…”