Synthesis of the Supported Au Polystyrene/poly(acrylic acid) Composite Microspheres and Their pH Regulated Performance†

doi:10.7503/cjcu20160084

Abstract

Abstract:

The core-shell polystyrene(PS)/poly(acrylic acid)(PAA) composite microgels with pH sensitivity were synthesized via two-step polymerization method. Au nanoparticles were supported onto pH sensitivity composite microgels via in situ reduction of chloroauric acid(HAuCl₄) using NaBH₄ as reduction agent and sodium citrate as stabilizer. The results demonstrated that the plasmonic coupling of gold nanoparticles could be regulated, and the diffusion of reactive substrates availably controlled, due to the shrinkage and swelling performance of the shell chains under the different acid and alkali conditions. The optical property and catalytic activity of Au NPs could be regulated by changing the micro-environment of composite microgels. Therefore, the performance of composite materials could be realized the pH-controllable.

Key words: Polymer microgel, pH sensitivity, Au nanoparticle, Localized surface plasmon resonance(LSPR), Supported catalyst

CLC Number:

O648

TrendMD:

TENG Xiaobo,ZHANG Chunxia,ZHANG Ying. Synthesis of the Supported Au Polystyrene/poly(acrylic acid) Composite Microspheres and Their pH Regulated Performance^†[J]. Chem. J. Chinese Universities, 2016, 37(8): 1509.

Figures/Tables 12

Fig.1 Schematic diagram for the synthesis of PS/PAA-Au composite materials

Fig.2 TEM images of PS microspheres(A) and PS/PAA core-shell composite materials(B)

Fig.3 HRTEM images of PS/PAA-Au composite materials

Fig.4 Dark field scanning STEM image(A) and Au elemental mapping image(B) of PS/PAA-Au composite materials

Fig.5 XPS spectra(A) and Au4f XPS fitting curve(B) of the composite materials (A) a. PS/PAA; b. PS/PAA-Au.

Fig.6 XRD patterns(A), UV-Vis spectra(B) and TGA curves(C) of PS/PAA(a) and PS/PAA-Au(b)

Fig.7 UV-Vis spectra(A) and digital photos of suspension solution of PS/PAA-Au composite materials with different pH values(B1—B3) pH: (B1) 3.5; (B2) 5.5; (B3) 10.

Fig.8 Dispersity of PS/PAA-Au composite materials in water/chloroform with different pH values pH: (A) 3.5; (B) 5.5; (C) 10.

Fig.9 UV-Vis absorption spectra during the catalytic reduction of 4-NP with different pH values in the presence of PS/PAA-Au pH: (A) 3.08; (B) 3.92; (C) 5.16; (D) 6.48; (E) 8.05; (F) 9.0.

Fig.10 Plots of ln(At/A0) vs. time for the reduction of 4-NP with different pH values before(A) and after(B) deleting the introduction period and plots of the kapp as a function of pH(C)

Fig.11 Possible catalytic mechanism of the supported catalyst in the catalytic reduction of 4-NP

Fig.12 Conversion of 4-NP in five successive cycles with PS/PAA-Au composite materials

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