NDLI: Optoelectronic and photocatalytic properties of in situ platinum-doped TiO$_{2}$ films deposited by means of pulsed laser ablation technique

Content Provider	Springer Nature Link
Author	Trabelsi, K. Hajjaji, A. Ka, I. Gaidi, M. Bessais, B. El Khakani, M. A.
Copyright Year	2016
Abstract	We report on the effect of Pt incorporation on the microstructural, optoelectronic and catalytic properties of TiO$_{2}$ thin films deposited by means of the pulsed-laser deposition (PLD) method. The structural, morphological, optoelectronic and catalytic properties of the deposited TiO$_{2}$:Pt films were systematically investigated, as a function of their Pt content, by means of various techniques including X-ray diffraction, X-ray photoelectron spectroscopy (XPS), atomic force microscopy, Fourier-transform infra-red spectroscopy and ellipsometry. The in situ doping of the PLD-TiO$_{2}$ films, at different Pt contents, was achieved by the concomitant laser ablation of a TiO$_{2}$ target uniformly covered with Pt wires. We show that by increasing the number of Pt wires positioned on the TiO$_{2}$ target from 1 to 4, the Pt concentration of the TiO$_{2}$:Pt films increases from 0.05 to 0.35 at.%. While the bandgap of room-temperature (RT) deposited films was found to be insensitive to their Pt content (remaining around the 3.2 eV anatase value), the TiO$_{2}$:Pt films deposited at high temperature (T$_{d}$ = 500 °C) were found to exhibit a significant narrowing of their bandgap (from 3.3 to 2.45 eV), when their Pt content is increased (from 3.3 to 2.45 eV). From a structural point of view, while the RT-deposited TiO$_{2}$:Pt films deposited are mainly amorphous with the presence of some TiO$_{2}$ nanocrystallites whose density increases as Pt content increases, while those deposited at 500 °C were found to crystallize in the anatase phase with their crystallinity improving with increasing Pt contents. XPS analyses have revealed that the incorporated Pt mainly exists in a metallic state, likely as nano-inclusions in an otherwise TiO$_{2}$ matrix. By being able to monitor the optoelectronic properties of the annealed TiO$_{2}$:Pt films through their Pt content, their photocatalytic activity was significantly improved with respect to that of their undoped TiO$_{2}$ counterpart. The enhancement of the photocatalytic activity is believed to be due to an enhanced photoabsorption of photons because of bandgap narrowing along with a better harvesting of the separated photogenerated charges.
Starting Page	3317
Ending Page	3324
Page Count	8
File Format	PDF
ISSN	09574522
Journal	Journal of Materials Science: Materials in Electronics
Volume Number	28
Issue Number	4
e-ISSN	1573482X
Language	English
Publisher	Springer US
Publisher Date	2016-10-26
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Optical and Electronic Materials Characterization and Evaluation of Materials
Content Type	Text
Resource Type	Article
Subject	Atomic and Molecular Physics, and Optics Biomaterials Biophysics Condensed Matter Physics Electronic, Optical and Magnetic Materials Bioengineering Electrical and Electronic Engineering Biomedical Engineering

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