Electro-Optics and Band Gap Energies of Nanosilver-Coated TiO2 Nanotubes on Titanium Metal

doi:10.1007/s40195-017-0664-6

Abstract

Abstract:

TiO₂ nanotubes on Ti metal surface were prepared by the electrochemical anodization method. Then, nanosilver was deposited onto the nanotubes by the electroless dip coating and the anodization. The obtained TiO₂ nanotubes were examined by using scanning electron microscopy, atomic force microscopy, Fourier transform infrared spectroscopy, X-ray diffraction, cyclic voltammetry, and UV-Vis. The electrochemical band gap (E _g ^CV ) of the nanosilver-coated TiO₂ nanotubes prepared by the anodization was found as 1.54 eV. Using the UV-Vis measurements, the optical band gap energy (E _g ^op. ) was calculated as 1.51 eV for the Ag/TiO₂ nanotubes obtained by electroless dip coating. The electrical conductivity of the TiO₂nanotubes also increased from 3.0 × 10^-4 to 34.7 S/cm after nano Ag deposition by the anodization method. These Ag/TiO₂ nanotubes with low band gap and high electrical conductivity are desirable for the applications in electronics, Li-ion batteries, and solar cells.

Key words: Electrochemical anodization, TiO₂ nanotubes, Nano Ag deposition, Band gap energy, Electrical conductivity

U?ursoy Olgun, Mustafa Gülfen, Fatih üstel, Hale Arslan. Electro-Optics and Band Gap Energies of Nanosilver-Coated TiO₂ Nanotubes on Titanium Metal[J]. Acta Metallurgica Sinica (English Letters), 2018, 31(2): 153-163.

Figures/Tables 12

Fig. 1 Nano Ag coating methods of TiO2 nanotube surfaces: a dip coating during the anodization of Ti, b electroless dip coating after the anodization of Ti

Fig. 2 SEM images of TiO2, Ag/TiO2 nanotubes

Fig. 3 EDS spectra of nano Ag/TiO2 nanotube surfaces

Fig. 4 Elemental mappings of Ag and Ti on nano Ag/TiO2 nanotube surfaces

Fig. 5 AFM surface images of TiO2, Ag/TiO2 nanotubes

Fig. 6 XRD patterns of TiO2 and Ag/TiO2 nanotubes

Fig. 7 FT-IR spectra of Ti, TiO2, Ag/TiO2 nanotubes

Fig. 8 CV voltammograms of Ti metal (a LiClO4, b KNO3), TiO2 nanotubes (c LiClO4, d KNO3), nano Ag/TiO2 nanotubes (e LiClO4, f KNO3)

Fig. 9 CV voltammograms of TiO2 nanotubes (a 100 mV/s, b 25 mV/s), nano Ag/TiO2 nanotubes (c electroless dip coating, 100 mV/s, d electroless dip coating, 25 mV/s, e dip coating during anodization, 100 mV/s, f dip coating during anodization, 25 mV/s) in 0.1 M KNO3 electrolyte

Table 1 Electrochemical band gap energies

Energy	TiO₂ nanotubes	Nano Ag/TiO₂ nanotubes (anodization dip coating)	Nano Ag/TiO₂ nanotubes (electroless dip coating)
E _HOMO (eV)	- 6.36	- 4.89	- 5.59
E _LUMO (eV)	- 3.34	- 3.34	- 3.22
E _g ^cv (eV)	3.02	1.54	2.37

Fig. 10 UV-Vis spectra of Ti metal, TiO2 nanotubes, nano Ag/TiO2 nanotubes

Fig. 11 Electrical conductivities of TiO2, Ag/TiO2 nanotubes

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Electro-Optics and Band Gap Energies of Nanosilver-Coated TiO₂ Nanotubes on Titanium Metal

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