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Electronic structure and magnetic properties of sub-3 nm diameter Mn-doped SnO2 nanocrystals and nanowires
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Image of FIG. 1.
FIG. 1.

(a) TEM image of 2% Mn:SnO NCs. Inset: Lattice-resolved TEM image of a single NC (scale bar, 5 nm). The lattice spacing indicated in the image corresponds to {110} plane of rutile SnO. (b) TEM image of 5% Mn:SnO NWs. Insets: Lattice-resolved TEM image of a single NW parallel (lower; scale bar, 5 nm) and perpendicular (upper; scale bar, 2 nm) to the growth direction (〈110〉). (c), (d) Size distribution histograms of Mn:SnO NCs (c) and NWs (d) corresponding to (a) and (b), respectively. (e) Typical EDX spectrum of Mn:SnO NCs. (f) XRD patterns of 2% Mn:SnO NCs (red) and the corresponding nanocrystalline films (blue). Vertical black lines are the pattern of bulk rutile SnO.

Image of FIG. 2.
FIG. 2.

(a) Mn K-edge XANES spectra of Mn:SnO NC samples having different doping concentrations, and reference compounds, as indicated in the graph. (b) Half-height energy of the normalized spectra as a function of the oxidation state, derived from part (a). (c) Typical UV-visible absorption spectrum of colloidal Mn:SnO NCs. The spectrum of a concentrated sample reveals the ligand-field transitions of Mn. (d) Photograph of the sample in (c).

Image of FIG. 3.
FIG. 3.

(a) Mn K-edge EXAFS spectra (k-weighted) of Mn:SnO NCs with different doping concentrations, as shown in the graph. (b) Pseudoradial distribution functions obtained by Fourier transformation of the spectra in (a). (c) Fourier-filtered EXAFS oscillations for the first shell (Mn–O) weighted by . The functions were fitted assuming Mn, Mn, and a combination of Mn and Mn oxidation states (dashed lines). (d) The dependence of Mn fraction (left ordinate) and Mn-O distance (right ordinate) on the doping concentration.

Image of FIG. 4.
FIG. 4.

(a) Simulation of the saturation magnetization of Mn and Mn dopants in SnO using Brillouin function. (b) 2 K saturation magnetization of free-standing 20% Mn:SnO NCs (open circles). The data were matched to the Brillouin function assuming equal contribution of Mn and Mn (purple line). (c) Magnetization hysteresis loop of 2% Mn:SnO nanocrystalline film, collected at 5 and 300 K. Inset: magnified hysteresis loop around  = 0 T. (d) Temperature dependence of the saturation magnetization of the same nanocrystalline film.


Generic image for table
Table I.

Parameters obtained from EXAFS analysis.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Electronic structure and magnetic properties of sub-3 nm diameter Mn-doped SnO2 nanocrystals and nanowires