Cu/TiO2 thin films prepared by reactive RF magnetron sputtering

Abstract

Cu/TiO 2 thin films were deposited on glass substrates by reactive RF magnetron sputtering technique. Crystalline structure, surface morphology and electronic structure were studied using X-ray diffraction (XRD), field emission scanning electron microscopy, atomic force microscopy and X-ray photoelectron spectroscopy (XPS). Transmittance and absorptance of these films were characterized by UV-Vis spectroscopy. XRD patterns demonstrate that TiO 2 films deposited on glass substrate at 300°C are observed to be in pure anatase phase, whereas Cu/TiO 2 films are amorphous in nature at 300°C substrate temperature. The crystallinity of Cu/TiO 2 thin films decreases with increasing the dopant concentrations of Cu in TiO 2 films. XPS studies show that Cu is in ?2 oxidation state in all films. The optical band gap of Cu/TiO 2 films decreases from *3.3 to *2.0 eV with the increase in the copper concentration. Further, antimicrobial studies of Cu/TiO 2 films with *3.9 at.% Cu exhibit high transmittance and best antimicrobial activity against E. coli and S. aureus compared to other doped films.

Synthesis and magnetic properties of nano-dimensional Fe1−xCuxAl2O4 (0.3 ≤ x ≤ 0.8)

“…Accordingly, Cu2p 3/2,1/2 core level peaks around 933.5 and 953.4 eV with corresponding satellite peaks and spin-orbit separation of 19.9 eV are assigned to Cu 2+ in these type of materials. 18,25,26 Satellite peaks are characteristics of oxidized transition metals especially, Fe, Co, Ni and Cu. 27 It has been well documented that an additional excitation of a second electron occurs during emission of a photoelectron of a core level creating a hole in it.…”

N/Fe/Zn co-doped TiO2 loaded on basalt fiber with enhanced photocatalytic activity for organic pollutant degradation

“…5(e), it could be seen that the binding energy values were 464.22 eV and 458.48 eV, belonging to Ti 2p 1/2 and Ti 2p 3/2 , respectively, indicating the appearance of Ti 4+ . 40,41 As shown in Fig. 5(f), the co-doping of N, Fe and Zn did not change the valence state of Ti, which was still in the valence state of Ti 4+ .…”

Dye degradation studies of Mo‐doped TiO2 thin films developed by reactive sputtering

“… In Mo/TiO 2 films, the titanium is present in +4 oxidation state as in pure TiO 2 , and the addition of Mo does not influence the nature of the Ti 4+ species significantly. The O1s core level spectra of all films, shown in Figure D, contain a main peak at ~530.0 eV, which is attributed to oxide materials only . The relative surface concentrations of Mo and Ti in the thin films are calculated from the integrated peak areas and atomic sensitivity factors of Mo3d and Ti2p.…”

“…From Figure , it is observed that as‐deposited Mo/TiO 2 films with higher concentration of Mo tend to be amorphous in nature. This can be attributed to the inhibition of TiO 2 crystal growth by addition of molybdenum . Increasing the concentration of Mo also leads to a reduction in the nucleation of the crystalline phase of anatase TiO 2.…”

“…In the Ti2p core level spectra shown in Figure C, the 2p 3/2,1/2 peaks at 458.5 and 464.33 eV correspond to Ti 4+ in TiO 2. In Mo/TiO 2 films, the titanium is present in +4 oxidation state as in pure TiO 2 , and the addition of Mo does not influence the nature of the Ti 4+ species significantly. The O1s core level spectra of all films, shown in Figure D, contain a main peak at ~530.0 eV, which is attributed to oxide materials only .…”