Anomalous refinement and uniformization of grains in metallic thin films
|Corresponding Author||Wang，Zhongchang; Zhang，Ziyang; Liu，Qian|
When a laser beam writes on a metallic film, it usually coarsens and deuniformizes grains because of Ostwald ripening, similar to the case of annealing. Here 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 shock-cooling. This 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 ∝ h. The linear relationship is significantly different from the classical spinodal dewetting theory obeying a nonlinear relationship (D ∝ h ) in common laser heating. We 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 M. This anomalous refinement effect is general and can be extended to many other metallic films.[Figure not available: see fulltext.].
National Natural Science Foundation of China["51971070","T2225017","10974037"] ; National Key Research and Development Program of China[2016YFA0200403] ; Natural Science Foundation of Shandong Province[ZR2021QF003] ; CAS Strategy Pilot Program[XDA 09020300] ; Eu-FP7 Project
|WOS Research Area|
Chemistry ; Science & Technology - Other Topics ; Materials Science ; Physics
Chemistry, Physical ; Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary ; Physics, Applied
|WOS Accession No|
Cited Times [WOS]:0
|Document Type||Journal Article|
|Department||Department of Materials Science and Engineering|
1.Chinese Academy of Sciences (CAS) Key Laboratory of Nanosystem and Hierarchical Fabrication,CAS Center for Excellence in Nanoscience,National Center for Nanoscience and Technology & University of Chinese Academy of Sciences,Beijing,100190,China
2.College of Mathematics and Physics,Qingdao University of Science and Technology,Qingdao,266061,China
3.Department of Materials Science and Engineering,Southern University of Science and Technology,Shenzhen,518055,China
4.School of Materials,Sun Yat-Sen University,Guangzhou,510275,China
5.Department of Quantum and Energy Materials,International Iberian Nanotechnology Laboratory (INL),Braga,4715-330,Portugal
6.School of Electronic and Information Engineering,Qingdao University,Qingdao,266071,China
7.The MOE Key Laboratory of Weak-Light Nonlinear Photonics and TEDA Applied Physics Institute and School of Physics,Nankai University,Tianjin,300457,China
Wang，Lei,Wang，Shu,Wang，Xiaofeng,et al. Anomalous refinement and uniformization of grains in metallic thin films[J]. Nano Research,2023.
Wang，Lei.,Wang，Shu.,Wang，Xiaofeng.,Zhang，Jianming.,Dong，Jianjie.,...&Liu，Qian.(2023).Anomalous refinement and uniformization of grains in metallic thin films.Nano Research.
Wang，Lei,et al."Anomalous refinement and uniformization of grains in metallic thin films".Nano Research (2023).
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