(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.
(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.
FT-IR spectrum of nanocomposites.
(a) XPS survey spectra of nanocomposites (black line) and NWs (red dotted line). [(b)–(e)] The high-resolution XPS spectra of , , , and for nanocomposites.
UV-vis absorption spectra of (a) NWs, (b) ZnO QDs, and (c) nanocomposites.
Room temperature PL spectra of NWs (blue line), ZnO QDs (green line), and nanocomposites (red line).
(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.
(Color online) Schematic diagram of bandgap and band offsets (in electron volt) for interfaces among NWs, ZnO QDs, and .
(a) Temperature-dependent PL spectra of nanocomposites. (b) The enlarged image of the UV emission in Fig. 8(a).
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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