Combinatorial synthesis and high throughput evaluation of doped TiO2 thin films for the development of photocatalysts

Yuji Matsumoto, Makoto Murakami, Zhengwu Jin, Akira Nakayama, Tetsuo Yamaguchi, Takashi Ohmori, Eiji Suzuki, Satoshi Nomura, Masashi Kawasaki, Hideomi Koinuma

Research output: Contribution to journalConference articlepeer-review

19 Citations (Scopus)


TiO2 thin films doped with various transition metals were systematically fabricated by combinatorial laser MBE technique. Alternating KrF excimer laser (λ = 248 nm) ablation of TiO2 and Ti1-x MxO2 (M = transition metal) was employed to deposit combinatorial library of 18 samples for each dopant with different concentrations. Anatase films with c-axis orientation were grown epitaxially on SrTiO3(001) substrate while the rutile phase films with a-axis orientation were on Al2O3(0001) substrate. Solid solubility of transition metals in both the phases was determined by X-ray diffraction. The anatase phase was found to dissolve the transition metals in higher concentrations than rutile phase. The parallel evaluation of the photocatalytic activity of the doped TiO2 in combinatorial libraries was performed with respect to photodecomposition of water in presence of a small amount of oxidizing or reducing agent which induced pH changes on the pixels. The high throughput evaluation of combinatorially deposited photocatalytic thin films was realized by adopting a potentiometric pH field effect transistor for sensing such pH changes.

Original languageEnglish
Pages (from-to)19-27
Number of pages9
JournalProceedings of SPIE - The International Society for Optical Engineering
Publication statusPublished - 2000
EventCombinatorial and Composition Spread Techniques in Materials and Devices Development - San Jose, CA, USA
Duration: 2000 Jan 262000 Jan 26


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