Electronic structure, charge transfer, and intrinsic luminescence of gadolinium oxide nanoparticles: Experiment and theory
- Title
- Electronic structure, charge transfer, and intrinsic luminescence of gadolinium oxide nanoparticles: Experiment and theory
- Author
- Bukhvalov Danil
- Keywords
- Gadolinium; Oxides; Nanoparticles; Luminescence; XPS; DFT; Defects
- Issue Date
- 2018-04
- Publisher
- ELSEVIER SCIENCE BV
- Citation
- APPLIED SURFACE SCIENCE, v. 436, page. 697-707
- Abstract
- The cubic (c) and monoclinic (m) polymorphs of Gd2O3 were studied using the combined analysis of several materials science techniques - X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), and photoluminescence (PL) spectroscopy. Density functional theory (DFT) based calculations for the samples under study were performed as well. The cubic phase of gadolinium oxide (c-Gd2O3) synthesized using a precipitation method exhibits spheroidal-like nanoclusters with well-defined edges assembled from primary nanoparticles with an average size of 50 nm, whereas the monoclinic phase of gadolinium oxide (m-Gd2O3) deposited using explosive pyrolysis has a denser structure compared with natural gadolinia. This phase also has a structure composed of threedimensional complex agglomerates without clear-edged boundaries that are similar to 21 nm in size plus a cubic phase admixture of only 2 at.% composed of primary edge-boundary nanoparticles similar to 15 nm in size. These atomic features appear in the electronic structure as different defects ([Gd ... O-OH] and [Gd ... O-O]) and have dissimilar contributions to the charge-transfer processes among the appropriate electronic states with ambiguous contributions in the Gd 5p - O2s core-like levels in the valence band structures. The origin of [Gd ... O-OH] defects found by XPS was well-supported by PL analysis. The electronic and atomic structures of the synthesized gadolinias calculated using DFT were compared and discussed on the basis of the well-known joint OKT-van der Laan model, and good agreement was established.
- URI
- https://www.sciencedirect.com/science/article/pii/S0169433217336747?via%3Dihubhttps://repository.hanyang.ac.kr/handle/20.500.11754/118340
- ISSN
- 0169-4332; 1873-5584
- DOI
- 10.1016/j.apsusc.2017.12.086
- Appears in Collections:
- COLLEGE OF NATURAL SCIENCES[S](자연과학대학) > CHEMISTRY(화학과) > Articles
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