期刊
ACS APPLIED MATERIALS & INTERFACES
卷 13, 期 2, 页码 3358-3368出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.0c18122
关键词
heterogeneous nanostructures; silver nanoparticles (Ag NPs); metal nanogaps; surface-enhanced Raman spectroscopy (SERS); anti-counterfeiting
资金
- Center for Advanced Meta-Materials (CAMM) - Ministry of Science, ICT, and Future Planning, Korea, through the Global Frontier Project (CAMM) [2014M3A6B3063707]
- Institute of Information & Communications Technology Planning & Evaluation (IITP) - Korea government (MSIT) [2020-0-00831]
- Basic Research Program of KIMM (Korea Institute of Machinery and Materials) [NK224C]
- National Research Foundation of Korea (NRF) - Korea government (MSIT) [2018R1A2B2004910]
- National Research Council of Science & Technology (NST), Republic of Korea [NK224C] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
A novel method for fabricating shape-controlled and well-arrayed heterogeneous nanostructures by altering the melting point of the metal thin film at the nanoscale is proposed. This method demonstrates the ability to fabricate uniform, stable, and unique structures with a fast, simple, and mass-producible process, suitable for various applications such as surface-enhanced Raman spectroscopy (SERS) substrates.
A novel method for fabricating shape-controlled and well-arrayed heterogeneous nanostructures by altering the melting point of the metal thin film at the nanoscale is proposed. Silver nanofilms (AgNFs) are transformed into silver nanoislands (AgNIs), silver nanoparticles (AgNPs), and silver nanogaps (AgNGs) that are well-ordered and repositioned inside the gold nanoholes (AuNHs) depending on the diameter of the AuNHs, the thickness of the AgNF, and the heating temperature (120-200 degrees C). This method demonstrates the ability to fabricate uniform, stable, and unique structures with a fast, simple, and mass-producible process. For demonstrating the diverse applicability of the developed structures, high-density AgNGs inside the AuNHs are utilized as surface-enhanced Raman spectroscopy (SERS) substrates. These AgNGs-based SERS substrates exhibit a performance enhancement, which is 1.06 x 10(6) times greater than that of a metal film, with a relative standard deviation of 19.8%. The developed AgNP/AgNI structures are also used as nonreproducible anti-counterfeiting signs, and the anti-counterfeiting/readout system is demonstrated via image processing. Therefore, our method could play a vital role in the nanofabrication of high-demand nanostructures.
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