Ultrasmooth Epitaxial Pt Thin Films Grown by Pulsed Laser Deposition

Torres-Castanedo, Carlos G.; Buchholz, D. Bruce; Pham, Thang; Zheng, Liyang; Cheng, Matthew; Dravid, Vinayak P.; Hersam, Mark C.; Bedzyk, Michael J.

doi:10.1021/acsami.3c16065

Title: Ultrasmooth Epitaxial Pt Thin Films Grown by Pulsed Laser Deposition

Journal Article · 19 December 2023 · ACS Applied Materials and Interfaces

DOI: https://doi.org/10.1021/acsami.3c16065 · OSTI ID:2345146

^[1]; Buchholz, D. Bruce ^[2]; Pham, Thang ^[2]; Zheng, Liyang ^[2];

^[2];

^[2]

Northwestern Univ., Evanston, IL (United States); Northwestern University
Northwestern Univ., Evanston, IL (United States)

Platinum (Pt) thin films are useful in applications requiring high-conductivity electrodes with excellent thermal and chemical stability. Ultrasmooth and epitaxial Pt thin films with single-crystalline domains have the added benefit of providing ideal templates for the subsequent growth of heteroepitaxial structures. Here, we grow epitaxial Pt (111) electrodes (ca. 30 nm thick) on sapphire (α-Al₂O₃ (0001)) substrates with pulsed laser deposition. This versatile technique allows control of the growth process and fabrication of films with carefully tailored parameters. X-ray scattering, atomic-force microscopy, and electron microscopy provide structural characterization of the films. Various gaseous atmospheres and temperatures were explored to achieve epitaxial growth of films with low roughness. A two-step (500 °C/300 °C) growth process was developed, yielding films with improved epitaxy without compromising roughness. The resulting films possess ultrasmooth interfaces (<3 Å) and high electrical conductivity (6.9 × 10⁶ S/m). Finally, Pt films were used as current collectors and templates to grow lithium manganese oxide (LiMn₂O₄ (111)) epitaxial thin films, a cathode material used in Li-ion batteries. In conclusion, using a solid-state ionogel electrolyte, the films were highly stable when electrochemically cycled in the 3.5-4.3 V vs Li/Li⁺ range.

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Research Organization:: Northwestern University, Evanston, IL (United States). Energy Frontier Research Centers (EFRC) (United States). Center for Electrochemical Energy Science (CEES); Energy Frontier Research Centers (EFRC) (United States). Hydrogen in Energy and Information Sciences (HEISs)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF)

Grant/Contract Number:: SC0023450; AC02-06CH11357

OSTI ID:: 2345146

Journal Information:: ACS Applied Materials and Interfaces, Journal Name: ACS Applied Materials and Interfaces Journal Issue: 1 Vol. 16; ISSN 1944-8244

Publisher:: American Chemical Society (ACS)Copyright Statement

Country of Publication:: United States

Language:: English

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Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
4D-STEM
epitaxy
lithium manganese oxide
lithium-ion battery
platinum
pulsed laser deposition

Title: Ultrasmooth Epitaxial Pt Thin Films Grown by Pulsed Laser Deposition

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