In2O3 Nanorod Bundles Derived from a Novel Precursor and In2O3 Nanoaggregates: Controllable Synthesis, Characterization, and Property Studies

Abstract

An indium−ethylene glycol−ethylenediamine (In−EG−EDA) complex precursor with a nanorod bundle structure was controllably synthesized in EG solvent via an EDA-assisted solvothermal process at 180 °C. The morphologies and phase structures of the samples were found to depend strongly on the pH values and alkaline reagents. This complex precursor was subsequently calcined at 640 °C in air, resulting in the formation of cubic phase In2O3 nanorod bundles without changing its one-dimensional morphology. In addition, In2O3 nanoaggregates with a diameter of 20 nm can be directly obtained using ammonia as alkaline reagent. A possible mechanism was proposed to explain the formation of In−EG−EDA nanorod bundles and In2O3 nanoaggregates. Both the In2O3 nanorod bundles and the nanoaggregates showed wide emission peaks from the ultraviolet to visible region in photoluminescence spectra.