One-Step Synthesis of Nearly Monodisperse, Variable-Shaped In2O3 Nanocrystals in Long Chain Alcohol Solutions

Nearly monodisperse, variable-shaped In2O3 NCs have been synthesized from different indium-organic precursors in oleyl alcohol Solutions at 320 degrees C Under both nitrogen and air atmospheres. When indium(III) acetate (In(ac)(3)) was employed as the metal precursor, spheroidal In2O3 NCs with all average diameter of 9.2 urn were obtained in a nitrogen atmosphere, whereas nanoparticles with ail incompletely developed morphology were obtained under air. Cubic In2O3 NCs with sizes of about 7 and 20 urn were produced in an air atmosphere when indium(III)acetylacetonate (In(acac)(3)) and indium(III) isopropoxide (In((OPr)-Pr-i)(3)), respectively, were used its precursors. For the In2O3 NCs synthesized from In(ac)(3) and In((OPr)-Pr-i)(3), the influence of oxygen (air) on the growth kinetics as well its oil the morphology of the resulting nanoparticles was also investigated. On the basis of the FT-IR Studies of the postreaction Solutions, different reaction mechanisms, depending oil the nature of the metal precursor, Were proposed. The variable-shaped In2O3 NCs showed relatively strong PL emissions at room temperature in the UV region. The spheroidal In2O3 NCs Were used for the design of gas sensor devices that were able to detect concentrations of H2S as low as 30 ppb at room temperature.