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Indexed by:期刊论文

Date of Publication:2017-10-01

Journal:CHEMISTRYOPEN

Included Journals:PubMed、Scopus、SCIE

Volume:6

Issue:5

Page Number:637-641

ISSN No.:2191-1363

Key Words:photonic crystals; Raman spectroscopy; self-assembly; surface plasmon resonance

Abstract:Herein, we developed a method to prepare monodisperse poly(styrene-co-maleic anhydride)@Ag (PSMA@Ag) core-shell microspheres with high surface charge intensity by using an in situ reduction method. In this method, ethylenediamine tetra acetic acid tetrasodium salt (Na(4)EDTA) was used as a reducing agent to promote the growth of Ag, and at the same time endowed the PSMA@Ag spheres with a surface charge. The monodispersity of PSMA and PSMA@Ag and the ordered array of the photonic crystal films were characterized by using SEM. The formation of Ag nanoparticles was confirmed by using TEM, HR-TEM, and XRD characterizations. Due to the existence of surface charges, the obtained PSMA@Ag microspheres easily self-assembled to form photonic crystal structures. In addition, the surface-enhanced Raman scattering (SERS) activity of the PSMA@Ag photonic crystal films was evaluated by detecting the signal from Raman probe molecules, 4-aminothiophenol (4-ATP). The PSMA@Ag photonic crystal films exhibited a high SERS effect, a low detection limit of up to 10 8 for 4-ATP, good uniformity, and reproducibility.