Abstract
Pure cubic phase, In2O3 nanoparticles with porous structure were synthesized by solid state thermal oxidation of un-irradiated and γ-irradiated indium acetyl acetonate in presence and absence of sodium dodecyl sulphate as surfactant. The as- synthesized In2O3nanoparticles were characterized by X-ray diffraction (XRD), fourier transformation infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), transition electron microscopy (TEM) and thermogravimetry (TG). The shapes and morphologies of as- synthesized In2O3nanoparticles were highly affected by γ-irradiation of indium acetyl acetonate precursor and by addition of sodium dodecyl sulphate as surfactant. Calcination of un-irradiated indium acetyl acetonate precursor to 4 hours of 600 °C leads to the formation of spherical- shaped accumulative and merged In2O3 nanoparticles with porous structure, whereas irregular porous architectures composed of pure In2O3nanoparticles were obtained by using γ-irradiated indium acetylacetonate precursor. The as- prepared In2O3 nanoproducts exhibit photoluminescence emission (PL) property and display thermal stability in a wide range of temperature (25-800 °C) which suggest possible applications in nanoscale optoelectronic devices.
Highlights
In2O3 is an important n- type semi- conductor with a wide direct band gap of about (3.5-3.8 eV) of potential use in optoelectronic devices and gas sensing applications[1,2,3]
The results demonstrated different morphologies and particle sizes for the as- synthesized In2O3 nanoparticles as result of γ- irradiation[14]
If we compare the morphology of In2O3 nanoparticles synthesized by sol-gel method in our previous publication with that reported in the present investigation using solid state thermal decomposition process, different morphology obtained
Summary
In2O3 is an important n- type semi- conductor with a wide direct band gap of about (3.5-3.8 eV) of potential use in optoelectronic devices and gas sensing applications[1,2,3]. Besides the different Bravais lattice, (bcc) or (rh), these polymorphs posses different space groups: I 213 (space group 199), I a 3 (space group 206) and R 3 C (space group 167)[4]. Several routes such as chemical vapor deposition (CVD)[5], Sol gel[6], solution phase growth[7], and solid state decomposition[8,9] have been employed for preparation of In2O3 nanoparticles. We will continue our investigation into using un-irradiated and γ-irradiated indium acetylacetonate (InAcAc) as precursors for preparation of In2O3 nanoparticles in presence and absence of sodium dodecyl sulphate (SDS) surfactant by thermal decomposition process. The results will discuss in view of the role of γ- irradiation and addition of surfactant on the morphologies, sizes and shapes of as‐synthesized In2O3 nanoparticles
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