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• W1975127506 abstract "Point defects in fumed $ensuremath{sim}7text{ensuremath{-}}mathrm{nm}$-sized silica nanoparticles have been studied by $K$- and $Q$-band electron spin resonance (ESR) following $10text{ensuremath{-}}mathrm{eV}$ irradiation used to photodissociate H from passivated defects. Various types of ESR-active point defects are revealed, including the familiar ${E}^{ensuremath{'}}$ center (generic entity $mathbf{∙}mathrm{Si}{mathrm{O}}_{3}$), EX, the peroxy radical (POR), the methyl radical, and an unknown closely axially symmetric center (${g}_{ensuremath{Vert}}=2.0041$, ${g}_{ensuremath{perp}}=2.0027$). The possible atomic nature of the latter is addressed. The ${E}^{ensuremath{'}}$ defects, occurring in a maximum density of $ensuremath{sim}1ifmmodetimeselsetexttimesfi{}{10}^{ensuremath{-}3}$ per nanoparticle, are monitored as a function of thermal treatment in vacuum in the range $850--1115phantom{rule{0.2em}{0ex}}ifmmode^circelsetextdegreefi{}mathrm{C}$ in order to assess specific physicochemical structural aspects of the particles. Experimental evidence is presented for the presence of two different systems of ${E}^{ensuremath{'}}$ centers. The specific ESR parameters of the ${E}^{ensuremath{'}}$ centers of one bath are found to be very similar to those of the $E^{ensuremath{'}}{}_{ensuremath{gamma}}$ center in bulk fused silica, while the second bath exhibits a different zero crossing $g$ value and line shape, attributed to variations in local structure. It is inferred that the latter ${E}^{ensuremath{'}}$ system pertains to the outer $mathrm{Si}{mathrm{O}}_{2}$ layers, exposing a structural nature different from bulk glassy $mathrm{Si}{mathrm{O}}_{2}$. Besides PORs, large numbers of other oxygen-hole type defects appear to be present also. The exhaustive number of all oxygen-hole centers, including the PORs, is determined at $ensuremath{sim}0.07$ defects/nanoparticle, making this kind of defect highly unlikely as playing a substantial role in narrowing of the optical bandgap, in contrast with previous suggestion." @default.
• W1975127506 created "2016-06-24" @default.
• W1975127506 creator A5039212753 @default.
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• W1975127506 date "2005-10-31" @default.
• W1975127506 modified "2023-10-16" @default.
• W1975127506 title "Electron spin resonance probing of fundamental point defects in nanometer-sized silica particles" @default.
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• W1975127506 doi "https://doi.org/10.1103/physrevb.72.155335" @default.
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