Tuning the Composition and Nanostructure of Pt/Ir Films via Anodized Aluminum Oxide Templated Atomic Layer Deposition
NORTHWESTERN UNIV EVANSTON IL
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Nanostructured metal films have been widely studied for their roles in sensing, catalysis, and energy storage. In this work, we demonstrate the synthesis of compositionally controlled and nanostructured PtIr films by atomic layer deposition ALD into porous anodized aluminum oxide templates. Templated ALD provides advantages over alternative synthesis techniques, including improved film uniformity and conformality as well as atomic-scale control over morphology and composition. Nanostructured Pt ALD films are demonstrated with morphological control provided by the Pt precursor exposure time and the number of ALD cycles. With these approaches, Pt films with enhanced surface areas, as characterized by roughness factors as large as 310, have been reproducibility synthesized. Additionally, nanostructured PtIr alloy films of controlled composition and morphology have been demonstrated by templated ALD, with compositions varying systematically from pure Pt to pure Ir. Lastly, the application of nanostructured Pt films to electrochemical sensing applications is demonstrated by the non-enzymatic sensing of glucose.
- Metallurgy and Metallography