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. 2017 Aug 15;6(5):637-641.
doi: 10.1002/open.201700118. eCollection 2017 Oct.

Fabrication of Poly(styrene-co-maleic anhydride)@Ag Spheres with High Surface Charge Intensity and their Self-Assembly into Photonic Crystal Films

Jiajie Bi  1 , Genrui Fan  1 , Suli Wu  1 , Xin Su  1 , Hongbo Xia  1 , Shu-Fen Zhang  1
Affiliations

Fabrication of Poly(styrene-co-maleic anhydride)@Ag Spheres with High Surface Charge Intensity and their Self-Assembly into Photonic Crystal Films

Jiajie Bi et al. ChemistryOpen. .

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 tetraacetic acid tetrasodium salt (Na4EDTA) 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.

Keywords: Raman spectroscopy; photonic crystals; self-assembly; surface plasmon resonance.

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Figures

Scheme 1
Scheme 1
Schematic illustration of the preparation of PSMA@Ag core–shell microspheres and their self‐assembly; PEI=polyethyleneimine.
Figure 1
Figure 1
SEM images of PSMA@Ag core–shell microspheres with diameters of a) 190, b) 225, and c) 250 nm. d) TEM, e) HR‐TEM, and f) XRD patterns of the PSMA@Ag core–shell microspheres.
Figure 2
Figure 2
SEM images of a–c) the surface and d–f) cross‐sections of the PSMA@Ag PCs films prepared from self‐assembled PSMA@Ag microspheres with different diameters: a, d) 190, b, e) 225, and c, f) 250 nm. g–i) Reflection spectra of the PSMA@Ag PCs films prepared from self‐assembled PSMA@Ag microspheres with different diameters. Insets: Digital photographs of the films in (a)–(c).
Figure 3
Figure 3
a) SERS spectra obtained for PC substrates prepared with PSMA@Ag spheres with different PBGs; b) SERS spectra obtained for PC substrates prepared with PSMA@Ag spheres with different Ag contents.
Figure 4
Figure 4
SERS spectra for the PC substrates a) with different concentrations of 4‐ATP and b) at five random spots.
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