Robust phase transfer, 3D-assembly and SERS application of multi-shaped gold nanoparticles. Issue 6 (3rd May 2021)

• Record Type: Journal Article
• Authors: Wu, Junwen; Chen, Songhua; Jia, Wenfeng
• Is Part Of: Journal of dispersion science and technology. Volume 42:Issue 6(2021)
• Page Start: 824
• Page End: 834
• Publication Date: 2021-05-03
• Subjects: Nanorod -- multi-amine surfactant -- phase transfer -- assembly -- SERS; Emulsions -- Periodicals; Suspensions (Chemistry) -- Periodicals; Emulsions; Suspensions; 541.34
• DOI: 10.1080/01932691.2019.1710527
• Languages: English
• ISSNs: 0193-2691

Abstract

Abstract: A robust, fast and versatile phase transfer approach to the transfer of large hydrophilic multi-shaped gold nanoparticles from aqueous to organic phase was systematically investigated. The procedure uses the amphiphilic surfactant bis-(amidoethylcarbamoylethyl) octadecylamine (C18N3), which consists of a long alkane chain to provide hydrophobic properties and terminal amine groups for hydrophilic properties. Furthermore, the 3D-assembly behavior, plasmonic properties and surface-enhanced Raman scattering properties of the hydrophobic multi-shaped gold nanoparticles derived from the phase transfer method on the surface of mercapto-silica colloidal spheres were systematically investigate. The surfaces of mercapto-silica spheres immobilize gold nanoparticles through strong coordination interactions between gold cations and thiol groups and allow the direct assembly of large multi-shaped nanoparticles on supporting colloidal spheres. The size of the gold nanoparticles used in both 3D-assembly and phase transfer is much larger (as large as 55 nm) than any known reports to date. This assembly strategy will provide the research community with a highly versatile, configurable, and reproducible process for the preparation of various structures and great flexibility in incorporating multiple nanoparticle components. Graphical Abstract: An effective procedure for phase transfer of multi-shaped, large size gold nanoparticles with the aid of a multi-amine surfactant C18N3 and their 3D-assembly on the support of mercapto-silica spheres is proposed.