Abstract
In this work we report the bandgap tuning of pseudoboehmite achieved by high energy ball milling. The milling process of pseudoboehmite was performed using a SPEX 8000 mill for of up to 10 h. Pseudooehmite powders were characterized before and after milling by X-ray diffraction, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy (XPS) and electron energy loss spectroscopy (EELS). XRD results confirmed that the pseudoboehmite structure is preserved for 10 h of milling. The crystallite size of pseudoboehmite was estimated by Scherer equation, observing a constant increase with milling time from 2.72 nm to 3.18 nm. The pseudobohemite has a reduction in d-spacing with milling in the “c-axis”, but an enlargement in the “a-b directions”. The “c-axis” modification is due to water release, while the “a-b-plane” enlargement is attributed to cold welding during milling. The XPS and EELS analyses demonstrated a bandgap tuning effect from 7.11 eV to 6.20 eV in the raw and milled pseudoboehmite for 10 h. The results were demonstrated analytically.
Translated title of the contribution | Sintonización de banda prohibida de nanopartículas de pseudoboehmita inducidas por confinamiento cuántico |
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Original language | English |
Pages (from-to) | 21934-21938 |
Number of pages | 5 |
Journal | Ceramics International |
Volume | 48 |
Issue number | 15 |
DOIs | |
State | Published - 1 Aug 2022 |
Keywords
- Bandgap
- Grain size
- Mechanical milling
- Pseudoboehmite