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Fabrication and photoluminescence of nanowires/ZnO quantum dots/ heterostructure
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View: Figures


Image of FIG. 1.
FIG. 1.

(a) and (b) XRD pattern and TEM image of NWs. (c) and (d) XRD pattern and TEM image of ZnO QDs. The inset of (b) and (d) show the HRTEM images of NWs and ZnO QDs, respectively.

Image of FIG. 2.
FIG. 2.

(a) and (b) TEM and HRTEM images of nanocomposites. [(c)–(e)] The enlarged images of the oval region 1, 2, and 3 in Fig. 2(b). (f) EDS image of nanocomposites.

Image of FIG. 3.
FIG. 3.

FT-IR spectrum of nanocomposites.

Image of FIG. 4.
FIG. 4.

(a) XPS survey spectra of nanocomposites (black line) and NWs (red dotted line). [(b)–(e)] The high-resolution XPS spectra of , , , and for nanocomposites.

Image of FIG. 5.
FIG. 5.

UV-vis absorption spectra of (a) NWs, (b) ZnO QDs, and (c) nanocomposites.

Image of FIG. 6.
FIG. 6.

Room temperature PL spectra of NWs (blue line), ZnO QDs (green line), and nanocomposites (red line).

Image of FIG. 7.
FIG. 7.

(a) Room temperature PL spectra of nanocomposites with the growth time of 0.5, 1.5, 3, 6, 9, and 12 h. (b) The enlarged image of the UV emission in Fig. 7(a). (c) The intensity of the yellow-orange emission at different growth times. (d) The intensity and peak position of the UV emission at different growth times.

Image of Scheme 1.
Scheme 1.

(Color online) Schematic diagram of bandgap and band offsets (in electron volt) for interfaces among NWs, ZnO QDs, and .

Image of FIG. 8.
FIG. 8.

(a) Temperature-dependent PL spectra of nanocomposites. (b) The enlarged image of the UV emission in Fig. 8(a).

Image of FIG. 9.
FIG. 9.

Temperature dependence of (a) the FWHM, (b) the peak energy, (c) the PL-integral intensity of the yellow-orange (green square) and UV (red triangle) emission. The integrated intensity of the yellow-orange and UV emission is normalized to the PL spectrum collected at 77 K.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Fabrication and photoluminescence of ZnS:Mn2+ nanowires/ZnO quantum dots/SiO2 heterostructure