Controlled synthesis and photoluminescence properties of In₂O₃ rods with dodecahedron In₂O₃ microcrystals on top

Abstract

In 2 O 3 rods with dodecahedron In 2 O 3 microcrystals on top were synthesized in an electrical furnace via Au-catalyzed vapor transport process. A catalyst-assisted selective vapor-solid (VS) growth was proposed to explain the formation of the dodecahedron In 2 O 3 microcrystal, while the self-catalytic VS growth mechanism dominated the subsequent one-dimensional (1D) growth of the In 2 O 3 rod underneath the In 2 O 3 microcrystal. The structural evolution of these structures was carefully examined during the synthesis process by controlling the growth parameters. The morphologies, crystalline structures and surface chemistry were characterized by scanning electron microscopy (SEM), X-ray diffraction technique (XRD), and X-ray photoelectron spectroscopy (XPS), respectively. The photoluminescence (PL) spectrum at room temperature of the as-grown In 2 O 3 structures exhibited both UV and blue luminescence emission under one excitation at 260 nm, which may be related to the existence of oxygen vacancies. The synthesized multifaceted In 2 O 3 microcrystal has shown to contain a large number of vertices and may find many applications in developing threedimensional (3D) resonators. This work will not only enrich the synthesis science but also will open doors for applications of such structures in optical devices.

Bulk In2O3 crystals grown by chemical vapour transport: a combination of XPS and DFT studies

“…[25]) thus the transformations of the band intensity and shape as a function of the defects type and concentration are exclusively related to oxygen defects [26]. The difference between the literature [24] and the CVT data is plotted in Fig. 4.…”

“…3. The spectra exhibit characteristic spin-orbital separation of [24] used as the XPS reference. The difference between the CVT and reference data is plotted in order to highlight the CVT-process impact on the O 1s core-level in the CVT-In 2 O 3 crystal.…”

“…The XPS O 1s core-level spectra for the CVT-sample and literature data for the microroded In 2 O 3 [24] are shown in Fig. 4.…”

“…al. in their microroded In 2 O 3 [24]. It is likely that the oxygen sublattice defectiveness will affect the material properties, e.g.…”

Vaporization thermodynamics of In2O3 by Knudsen effusion mass spectrometry. The standard enthalpy of formation of In2O(g)

“…[6][7][8][9][10] Vacuum deposition methods and related techniques are often preferred in the synthesis of thin films and nanostructures due to the high purity of the resulting materials and coatings. [11][12][13][14] The essence of these methods is to transfer a target substance into the gas phase, followed by condensation on a substrate. Hence, vaporization thermodynamics of substances is of fundamental importance for choosing deposition conditions, as well as for producing multicomponent materials of a desired composition.…”