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|Type:||Artigo de periódico|
|Title:||Structural Evolution In Crystalline Moo 3 Nanoparticles With Tunable Size|
|Abstract:||In this study MoO 3 nanoparticles were prepared in porous Vycor glass by impregnation-decomposition cycles (IDC) with molybdenum(VI) 2-ethylhexanoate. X-ray diffraction data show that the nanoparticles are crystalline and are in the orthorhombic α-MoO 3 phase. Raman spectroscopy data also indicate the formation of this phase. The profiles in the Raman spectra changed with the number of IDC, indicating a structural evolution of the MoO 3 nanoparticles. The IDC methodology promoted a linear mass increase and allowed tuning the nanoparticle size. Analysis of HRTEM images revealed that for 3, 5 and 7 IDC, the MoO 3 nanoparticle average diameters are 3.2, 3.6 and 4.2 nm. Diffuse reflectance spectroscopy indicates a consistent red shift in the band gap from 3.35 to 3.29 eV as the size increases from 3.2 to 4.2 nm. This observed red shift in the band gap of the MoO 3 nanoparticles is presumably due to quantum confinement effects. © 2012 Elsevier Inc.|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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