Indium Oxide and Europium/Dysprosium Doped Indium Oxide Nanoparticles:  Sonochemical Synthesis, Characterization, and Photoluminescence Studies

Abstract

Indium oxide and europium/dysprosium doped indium oxide nanoparticles were prepared using a sonochemical technique where indium ethoxide was used as a precursor. The obtained indium oxide nanoparticles were characterized using powder X-ray diffraction (XRD), transmission electron microscopy (TEM), and selected area electron diffraction (SAED) techniques. The band gaps of the particles were estimated using diffuse reflectance spectroscopy. With change in size of particles from 8 to 14 nm, the band gap varied between 4.11 and 3.79 eV. The photoluminescence (PL) spectra of In 2 O 3 nanoparticles showed peaks in visible region characteristic of shallow traps present within the nanoparticles. Weak luminescence was observed in europiumdoped indium oxide nanoparticles,

Monodispersed In2O3 mesoporous nanospheres: One-step facile synthesis and the improved gas-sensing performance

“…Extrapolation of the linear portion to ˛ = 0 gives an optical band gap value of 3.1 eV, suggesting that the as-obtained In 2 O 3 mesoporous nanospheres are semiconducting with a direct transition. Compared to the reported band gap values such as 3.7 eV for bulk In 2 O 3 [49], and 3.2-3.8 eV for In 2 O 3 films [50,51], the relatively small band gap of our In 2 O 3 product would originate from the unique mesoporous structure.…”

Applications of Ultrasound to the Synthesis of Nanostructured Materials

“…Examples of successful sonochemical syntheses include TiO 2 , [56] ZnO, [57][58][59] CeO 2 , [60] MoO 3 , [61] V 2 O 5 , [62] In 2 O 3 , [63] ZnFe 2 O 4 , [64] PbWO 4 , [65,66] BiPO 4 , [67] and ZnAl 2 O 4 . [68] Yu and coworkers revealed that sonochemically prepared titania nanoparticles are more photocatalytically active than commercial titania nanoparticles (e.g., Degussa P25).…”

Combined SANS and SAXS study of the action of ultrasound on the structure of amorphous zirconia gels

“…The advantages of the ultrasound-assisted sol-gel technique over conventional routes of nanomaterials synthesis include shortening the synthesis duration due to faster hydrolysis, leading to more uniform particle size distribution, higher surface area, better thermal stability, and improved phase purity [4]. Examples of successful ultrasound-assisted sol-gel synthesis of metal oxide nanostructures include TiO 2 [8][9][10], ZnO [11][12][13], MoO 3 [14], In 2 O 3 [15], ZrO 2 [16], SiO 2 [17][18][19], etc. It was shown that in a number of cases, sonochemically prepared materials demonstrate better characteristics than those synthesized by conventional methods.…”