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Spontaneous Growth of 3D Silver Mesoflowers on Poly(4‐vinylpyridine) Brushes‐Grafted‐Graphene Oxide Films and Facile Creation of Nanoporosities over their Surface
Author(s) -
Feng Lihua,
Wang Wenqin,
Li Xiyong,
Chen Tao
Publication year - 2019
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201903959
Subject(s) - graphene , materials science , oxide , noble metal , nanoporous , grafting , chemical engineering , nanotechnology , reducing agent , raman spectroscopy , surface enhanced raman spectroscopy , metal , polymer , raman scattering , composite material , metallurgy , optics , physics , engineering
Fabricating three‐dimensional (3D) hierarchical noble‐metal particles by spontaneous redox reactions between graphene and noble‐metal salts still remains a great challenge. Herein, the fact that graphene oxide (GO) itself acts as both a platform for grafting polymer brushes and a reducing agent to reduce [Ag(NH 3 ) 2 ] + ions is taken advantages of. 3D flower‐like Ag mesoparticles (Ag mesoflowers, Ag MFs) with tunable size and shapes can spontaneous grow on poly(4‐vinylpyridine) brushes‐grafted‐graphene oxide (P4VP‐g‐GO) films in Ag(NH 3 ) 2 OH solution without the use of any additional reducing agent. The residual Ag(NH 3 ) 2 OH on 3D Ag MFs surface can be further reduced by NaBH 4 , causing abundant nanoporosities over the entire Ag MFs. The resulting Ag nanoporous MFs (Ag NMFs) with larger surface‐to‐volume ratio and higher nanoscale roughness exhibit ultrasensitivity in surface‐enhanced Raman spectroscopy (SERS) detection, and the detection limit for 4‐aminothiophenol is as low as 10 −13 m .