Beilstein J. Nanotechnol.2022,13, 975–985, doi:10.3762/bjnano.13.85
initial system for the calculations consists of a tetragonal supercell of ZrO2 containing 96 atoms (64 O atoms and 32 Zr atoms), which eventually relaxes to an approximately cubic supercell as an effect of doping (see [4][40][41] for Fe-doped ZrO2 and [42] for Ge-doped HfO2, a similar oxide, where a
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Figure 1:
(a) Zirconia containing two Ni atoms substituting Zr atoms without O vacancies, that is, structure S...
Beilstein J. Nanotechnol.2019,10, 211–221, doi:10.3762/bjnano.10.19
, F-91297 Arpajon, France 10.3762/bjnano.10.19 Abstract We report an experimental study demonstrating the feasibility to produce both pure and Ge-doped silica nanoparticles (size ranging from tens up to hundreds of nanometers) using nanosecond pulsed KrF laser ablation of bulk glass. In particular
, pure silica nanoparticles were produced using a laser pulse energy of 400 mJ on pure silica, whereas Ge-doped nanoparticles were obtained using 33 and 165 mJ per pulse on germanosilicate glass. The difference in the required energy is attributed to the Ge doping, which modifies the optical properties
of the silica by facilitating energy absorption processes such as multiphoton absorption or by introducing absorbing point defects. Defect generation in bulk pure silica before nanoparticle production starts is also suggested by our results. Regarding the Ge-doped samples, scanning electron
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Figure 1:
Sample A (SiO2+Ge, 33 mJ/pulse); a) SEM image of an agglomerate/aggregate of nanoparticles, inset z...