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X-ray nanospectroscopic characterization of a molecularly thin ferromagnetic nanosheet
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View: Figures


Image of FIG. 1.
FIG. 1.

(a) Structure of a two-dimensional nanosheet. Ti(Co) atoms are coordinated with six oxygen atoms and the resulting octahedra are joined via edge sharing to produce the two-dimensional lattice. Its thickness is , being consisted of two edge-shared octahedra. (b) AFM image of nanosheets. The monolayer and overlapped nanosheets are observed.

Image of FIG. 2.
FIG. 2.

(a) PEEM image of a single molecular nanosheet on Au substrate taken at the photon energy of 773 eV. Five different areas (1–5) with size of about are shown in the figure. (b) nano-XAS spectra for five different areas in the nanosheet. The numbers and colors of each spectrum correspond to the area shown in Fig. 1(a).

Image of FIG. 3.
FIG. 3.

(a) PEEM image of nanosheet on substrate with the FOV (field of view) of . The dark and bright regions in the PEEM image indicate] the nanosheets and the substrate, respectively. The dashed red line in the figure shows the ROI for XPS measurement. (b) XPS spectrum taken at the photon energy of 900 eV of the area shown in Fig. 2(a). Two peaks at the binding energies of 797 and 780 eV correspond to and core levels, respectively. Two satellite peaks were also observed at 804 and 787 eV, which are about 7 eV binding energy higher than those of both and main peaks.

Image of FIG. 4.
FIG. 4.

(a) PEEM image of nanosheets taken at the photon energy of 773 eV with the FOV of . (b) XAS spectra in each region shown in Fig. 3(a). (c) Schematic of the nanosheet distributions in the lateral direction. (d) Cross sectional schematic of the nanosheet with different stacking structures.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: X-ray nanospectroscopic characterization of a molecularly thin ferromagnetic Ti1−xCoxO2 nanosheet