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anomalous refinement and uniformization of grains in metallic thin films

Nano Research 2023年第12期16卷 13358-13365页

作者： Lei Wang Shu Wang Xiaofeng Wang Jianming Zhang Jianjie Dong Bin Wei Haiguang Yang Zhongchang Wang Ziyang Zhang ChuanFei Guo Qian Liu Chinese Academy of Sciences(CAS)Key Laboratory of Nanosystem and Hierarchical Fabrication CAS Center for Excellence in NanoscienceNational Center for Nanoscience and Technology&University of Chinese Academy of SciencesBeijing 100190China College of Mathematics and Physics Qingdao University of Science and TechnologyQingdao 266061China Department of Materials Science and Engineering Southern University of Science and TechnologyShenzhen 518055China School of Materials Sun Yat-Sen UniversityGuangzhou 510275China International Iberian Nanotechnology Laboratory(INL) Department of Quantum and Energy MaterialsBraga 4715-330Portugal School of Electronic and Information Engineering Qingdao UniversityQingdao 266071China The MOE Key Laboratory of Weak-Light Nonlinear Photonics and TEDA Applied Physics Institute and School of Physics Nankai UniversityTianjin 300457China

When a laser beam writes on a metallic film,it usually coarsens and deuniformizes grains because of Ostwald ripening,similar to the case of *** we show an anomalous refinement effect of metal grains:A metallic silver film with large grains melts and breaks into uniform,close-packed,and ultrafine(~10 nm)grains by laser direct writing with a nanoscale laser spot size and nanosecond pulse that causes localized heating and adaptive *** method exhibits high controllability in both grain size and uniformity,which lies in a linear relationship between the film thickness(h)and grain size(D),D∝*** linear relationship is significantly different from the classical spinodal dewetting theory obeying a nonlinear relationship(D∝h5/3)in common laser *** also demonstrate the application of such a silver film with a grain size of~10.9 nm as a surface-enhanced Raman scattering chip,exhibiting superhigh spatial-uniformity and low detection limit down to 10-15 *** anomalous refinement effect is general and can be extended to many other metallic films.

关键词： laser direct writing anomalous refinement localized heating ripening linear relationship

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