Preparation of 2D Periodic Nanopatterned Arrays through Vertical Vibration-Assisted Convective Deposition for Application in Metal-Enhanced Fluorescence

Processes

Pichet Limsuwan¹  Apiwat Phetsahai¹  Kittidhaj Dhanasiwawong²  Kheamrutai Thamaphat²  Mati Horprathum³  Annop Klamchuen⁴ 

[1] Green Synthesis and Application Laboratory, Applied Science and Engineering for Social Solution Research Unit, Department of Physics, Faculty of Science, King Mongkut’s University of Technology, Bangkok 10140, Thailand;Nanoscience and Nanotechnology Graduated Program, Faculty of Science, King Mongkut’s University of Technology Thonburi, Bangkok 10140, Thailand;National Electronics and Computer Technology Center (NECTEC), National Science and Technology Agency (NSTDA), Pathum Thani 12120, Thailand;National Nanotechnology Center (NANOTEC), National Science and Technology Development Agency (NSTDA), Pathum Thani 12120, Thailand;

关键词: colloidal lithography;    convective deposition;    localized surface plasmon resonance;    metal-enhanced fluorescence substrate;    vertical vibration;   

DOI  :  10.3390/pr10020202

来源: DOAJ

【 摘 要 】

The performance of a metal-enhanced fluorescence (MEF) substrate is fundamentally based on the orientation of the metal nanostructures on a solid substrate. In particular, two-dimensional (2D) periodic metallic nanostructures exhibit a strong confinement of the electric field between adjacent nanopatterns due to localized surface plasmon resonance (LSPR), leading to stronger fluorescence intensity enhancement. The use of vertical vibration-assisted convective deposition, a novel, simple, and highly cost-effective technique for preparing the 2D periodic nanostructure of colloidal particles with high uniformity, was therefore proposed in this work. The influences of vertical vibration amplitude and frequency on the structure of thin colloidal film, especially its uniformity, monolayer, and hexagonal close-packed (HCP) arrangement, were also investigated. It was found that the vibration amplitude affected film uniformity, whereas the vibration frequency promoted the colloidal particles to align themselves into defect-free HCP nanostructures. Furthermore, the results showed that the self-assembled 2D periodic arrays of monodisperse colloidal particles were employed as an excellent template for a Au thin-film coating in order to fabricate an efficient MEF substrate. The developed MEF substrate provided a strong plasmonic fluorescence enhancement, with a detection limit for rhodamine 6G as low as 10⁻⁹ M. This novel approach could be advantageous in further applications in the area of plasmonic sensing platforms.

【 授权许可】

Unknown