TiO2 oxide film

Figure 7 HREELS spectra at room temperature (a) titanium oxide film with 30MLE thickness on Mo(llO) (b) TiO2(110) single crystal. Ep = 4.7 eV. (From Ref. 48.)... 

Li, M.C., and Shen, J.N. 2006. Photoelectrochemical oxidation behaviour of organic substances on TiO2 thin-film electrodes. Journal of Solid State Electrochemistry 10, 980-986. 

An aluminum electrode modified by a chemically deposited palladium pen-tacyanonitrosylferrate film was reported in [33]. Vitreous carbon electrode modified with cobalt phthalocyanine was used in [34]. Electrocatalytic activity of nanos-tructured polymeric tetraruthenated porphyrin film was studied in [35[. Codeposition of Pt nanoparticles and Fe(III) species on glassy-carbon electrode resulted in significant catalytic activity in nitrite oxidation [36[. It was shown that the photocatalytic oxidation at a TiO2/Ti film electrode can be electrochemically promoted [37]. 

A number of works are devoted to the electrochemical preparation of ZnO, which may have application in photocatalysis, ceramics, piezoelectric transducers, chemical sensors, photo vol tales, and others. ZnO has the same band-gap energy as TiO2, and the oxygenation capacities for both compounds should be similar. Yamaguchi etal. [155] prepared photoactive zinc oxide films by anodizing a zinc plate. Such films could decompose gaseous acetaldehyde with the aid of black lights. 

The tltanla-based thin film catalyst models were constructed by first oxidizing the titanium surface In 5 x 10 torr of O2 for approximately 30 minutes at 775 K. This produced an AES llneshape consistent with fully oxidized TIO2. The metal was then vapor deposited onto the oxide support with the latter held at 130 K. The thickness of the metal overlayer and Its cleanliness were verified by AES. After various annealing and adsorption procedures, these thin films were further characterized using SSIMS, AES and TDS. For comparison, some work was done with Pt on Al20s. In this case a Mo foil covered with AI2O3 replaced the Tl(OOOl) substrate. 

The TiO2(110) surface can be modified to alter the surface chemistry of adsorbed methoxides. Recently Vohs et al. [73] have reported temperature programmed desorption studies of methanol on TiO2(110)-supported V2O5. Deposited monolayer films of vanadia converted some of the adsorbed methanol to formaldehyde and water, while multilayer films of vanadia on the TiO2(110) surface were found to be inactive for methanol oxidation. Furthermore, adsorption studies of formaldehyde indicated that formaldehyde production from... 

Photocatalytic oxidation of organic pollutants on TiO2-based materials has been extensively investigated. The catalyst is used in the form of a suspension of fine particles or thin film on robust substrates. Figure 12.2 shows the variation of open-circuit potential with time for TiO2 film electrodes, prepared by anodization of Ti... 

Guo Q and Goodman D W Vanadium oxide thin-films grown on rutile TiO2(110)-(1 x 1) and (1 x 2) surfaces Surf. Sci. 437 38... 

KD Schierbaum, X Wei-Xmg, and W Gopel, "Schottky Earners and Ohimc Contacts with Pt/TiO2(110) Implications to Control Gas Sensor and Catalytic Properties", WEH Symposium "Oxides", Bad Honnef (FRG) 2/1993, and H -J Freund, E Umbach (Eds), "Adsorption on Ordered Surfaces of Ionic Solids and Thin Films", p 268, Spnnger, Berlin 1993, ISBN 3-540-57416-6, and references given there... 

Figure 15.24 Scanning probe microscopic images of point defects on oxide surfaces (a) MgO(OOl) thin films (5 x 5 nm ) (from Sterrer, 2006 [107]), (b) TiO2(110) (10 x lOnm ) (from Fukui, 1997 [109]), and (c) CeOj] ) (4x3.5nm ) (from Esch, 2005 [115].

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