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journal article·2026-01Open access

Mechanistic Transformation of CuI Nanoparticles Into Oxidation‐Resistant 2D Copper Nanoplates

Hyeuk Jin Han, Moon Young Yang, Changsoo Lee, Gangtae Jin, James L Hart, Rabecca Mutheu, Hyung il Lee, Seo Hyun Kim, Hanhwi Jang, Minjoon Kim, Yeon Sik Jung, William A. Goddard, Judy J. Cha, Chungseok Choi

Small· Volume 22· Issue 1
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Abstract

Abstract Unconventional phase transformations reveal new crystallization mechanisms, yet direct observation of such pathways during nanoscale solution‐phase synthesis remains challenging. This study uncovers an atypical growth process in which thermodynamically stable CuI nanoparticles (NPs) transform into high‐energy 2D Cu plates. Using a combination of in situ transmission electron microscopy, ex situ structural analysis, and density functional theory calculations shows that the formation of structural defects induced by hexadecylamine and chloride ions facilitates the transformation by promoting surface iodine vacancies. The resulting Cu{111} nanoplates, with ultrathin thicknesses (≈4 nm) and exceptionally high aspect ratios (≈450), display enhanced oxidation resistance and long‐term stability under ambient conditions. This resistance is attributed to the close‐packed {111} facets, which suppress chemical oxidation even after extended exposure to air over 100 days. These findings provide new insights into non‐classical crystallization pathways in metal nanomaterials and suggest a versatile approach for preparing oxidation‐resistant, structurally defined Cu nanostructures.
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Research context

Nanomaterials

OpenAlex topics: Copper-based nanomaterials and applications · Nanomaterials and Printing Technologies · Gold and Silver Nanoparticles Synthesis and Applications

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Department of Materials Science and Engineering Cornell University Ithaca NY 14853 USA

Department of Materials Science and Engineering Sungshin Women's University Seoul 01133 Republic of Korea

Materials and Process Simulation Center (MSC) California Institute of Technology Pasadena CA 91125 USA

Department of Chemical Engineering Education Chungnam National University 99 Daehak‐ro Daejeon 34134 Republic of Korea

Department of Electronic Engineering Gachon University Seongnam 13120 Republic of Korea

SKKU Advanced Institute of Nanotechnology and Department of Nanoengineering Sungkyunkwan University Suwon 16419 Republic of Korea

Department of Materials Science and Engineering Korea Advanced Institute of Science and Technology 291 Daehak‐Ro, Yuseong‐Gu Daejeon 34141 Republic of Korea

Funding

National Research Foundation of Korea · National Science Foundation · Gordon and Betty Moore Foundation

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