Porosity-controllable magnetoplasmonic nanoparticles and their assembled arrays. Issue 15 (2nd April 2020)

• Record Type: Journal Article
• Authors: Tran, Van Tan; Lee, Dong Kyu; Kim, Jeonghyo; Lee, Jaewook; Tufa, Lemma Teshome; Pham-Cong, De; Kim, Chang-Seok; Lee, Jaebeom
• Is Part Of: Nanoscale. Volume 12:Issue 15(2020)
• Page Start: 8453
• Page End: 8465
• Publication Date: 2020-04-02
• Subjects: Nanoscience -- Periodicals; Nanotechnology -- Periodicals; 620.505
• DOI: 10.1039/d0nr01178a
• Languages: English
• ISSNs: 2040-3364

Abstract

Abstract : The porosity of the Fe3 O4 shells coating on Ag NPs is well controlled using an anisotropic etching method, providing an effective approach to modulate the chemical and optical properties of the colloids as well as their 1D and 2D assembled arrays. Abstract : Control of the chemical and physical properties of nanoscale colloids and their nanoassemblies remains a challenging issue for enhancing the performance and functionalities of nanodevices. In this study, we report a post-synthesis etching method to tailor the porosity of the Fe3 O4 shells coating on Ag NPs, establishing a facile but effective approach to regulate the chemical and optical properties of the colloids and their assembled structures. As the shell porosity increases, the NPs are transformed, producing enhanced catalytic activity and the surface-enhanced Raman spectroscopy (SERS) effect, which results from enhanced chemical diffusion into the Ag core. Magnetoplasmonic (MagPlas) one- (1D) and two- (2D) dimensional arrays fabricated using these porosity-controllable NPs exhibit intriguing plasmon properties that are strongly affected by the porosity of the particle shell. Furthermore, the bright coloration of the 2D arrays is tuned by changing the shell porosity or introducing an additional metallic layer. Such 1D and 2D porous MagPlas metastructures possessing Fe3 O4 shells with tunable porosities are a fulcrum for developing recyclable catalysts and tunable optical filters with optimized activity, selectivity, and sensitivity, as well as color displays and sensing platforms.