Controllable Synthesis of In₂O₃ Nanocubes, Truncated Nanocubes, and Symmetric Multipods

Abstract

A series of novel In2O3 nano/microstructures, namely, nanocubes, truncated nanocubes, and multipods, were controllably synthesized by the thermal evaporation of metallic In grains at 850 °C. The crystalline structure and morphologies of the In2O3 products were characterized using X-ray diffraction, field-emission scanning electron microscopy, and transmission electron microscopy. The distance between the substrate and the source and the gas flow rate are found to be two important factors in the formation of various structures. The growth mechanism and structural evolution of the obtained In2O3 structures are discussed in detail. The room-temperature photoluminescence reveals that the ratio of the UV emission to visible emission of In2O3 nanoparticles can be enhanced greatly by H2 plasma treatment.

Controllable synthesis of novel In2O3 nanostructures and their field emission properties

“…It is observed that the ultraviolet peak centered at about 378 nm [8,25] does not exist in these spectra, while the wide-band emission covering the green and orange regions with three peaks around 576, 592, and 624 nm is very strong. The visible emission can be ascribed to the deep level or trap state emission due to the presence of oxygen vacancies [26], and the emission would be enhanced by low crystallinity and structure defects.…”

“…In 2 O 3 , an important transparent semiconductor with a wide direct band gap of 3.6 eV at room temperature, can be one of the most attractive conductive oxides for field emission because of its relatively low electron affinity, convenience of n-type doping, high chemical inertness, and sputter resistance [7]. Recently, nanostructures of In 2 O 3 have been paid considerable attention due to their aesthetic morphologies, novel characteristics, and important potential applications in various nanodevices [8][9][10][11]. Up to now, many methods have been applied to synthesize various In 2 O 3 nanostructures, such as nanowires, nanorods, nanobelts, nanotubes, nanoparticles, nanochains [12][13][14][15][16][17][18][19], etc.…”

Controllable synthesis and field emission properties of In2O3 nanostructures

“…The growth mechanisms of as-prepared In 2 O 3 nanostructures are discussed. Since no catalyst was used, the growth process of the obtained products A, C and D can be interpreted by the vapor solid (VS) mechanism [16]. With the temperature increasing at the horizontal tube furnace, the amount of In vapors became sufficient.…”

Synthesis of indium oxide hexagonal microcavity and identification of its whispering gallery modes

“…The origin of the visible emission is from the defects of oxygen or indium vacancies [12,13]. In Fig.…”