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(a) Lateral view and (b) top view FESEM images of TNAs coated on the top of the nanotubes by Cu2O NPs. Inset: Size distribution of Cu2O NPs with an average diameter of 120.5 nm and a standard deviation of 50.3 nm on top of TNAs. Raman spectra of (c) TNAs and (d) Cu2O/TNA heterojunctions. (e) X-ray diffraction patterns of TNAs and Cu2O/TNA heterojunctions marked as I and II, respectively. (f) Survey spectra, (g) Cu 2p XPS spectra, and (h) Ti 2p XPS spectra of Cu2O NP film/TNA heterojunctions.
(a) Schematic diagram of DWCNT film/Cu2O NP film/TNA heterojunctions for I-V measurements. (b) Absorbance spectrum of DWCNT film/TNA heterojunctions and DWCNT film/Cu2O NP film/TNA heterojunctions.
(a) I-V characteristic of DWCNT film/TNA heterojunctions and DWCNT film/Cu2O NP film/TNA heterojunctions. Photoresponse of DWCNT film/Cu2O NP film/TNA heterojunctions under illumination at (b) 405 nm and (c) 532 nm. (d) Photoresponse of DWCNT film/TNA heterojunctions under illumination at 532 nm.
Energy level diagram of DWCNT film/Cu2O NP film/TNA heterojunctions. Energy level values are shown with respect to the vacuum level.
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