Construction of Au@Pt core--satellite nanoparticles based on <i>in-situ</i> reduction of polymeric ionic liquid protected gold nanoparticles

doi:10.1007/s11706-017-0365-0

Front. Mater. Sci.

2017, Vol. 11

Issue (1) : 42-50 https://doi.org/10.1007/s11706-017-0365-0

RESEARCH ARTICLE

Construction of Au@Pt core--satellite nanoparticles based on in-situ reduction of polymeric ionic liquid protected gold nanoparticles

Wenlan WU²,Junbo LI¹(

),Sheng ZOU¹,Jinwu GUO¹,Huiyun ZHOU¹

¹. College of Chemical Engineering & Pharmaceutics, Henan University of Science & Technology, Luoyang 471023, China
². Medical School, Henan University of Science & Technology, Luoyang 471003, China

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Abstract

A method of in-situ reduction to prepare Au@Pt core–satellite nanoparticles (NPs) is described by using Au NPs coating poly[1-methyl 3-(2-methacryloyloxy propylimidazolium bromine)] (PMMPImB-@-Au NPs) as the template. After electrostatic complex chloroplatinic acid with PMMPImB shell, the composite NP was directly reduced with N₂H₄ to produce Au@Pt core–satellite NPs. The characterization of composite and core–satellite NPs under different amounts of chloroplatinic acid were studied by DLS, UV-vis absorption spectrum and TEM. The satellite Pt NPs with a small size (~2 nm) dotted around Au core, and the resulting Au@Pt core–satellite NPs showed a red-shift surface plasmon resonance (SPR) and a good dispersion due to effectively electrostatic repulsion providing by the polymeric ionic liquid (PIL) shell. Finally, Au@Pt core–satellite NPs exhibit an enhanced catalytic activity and cycled catalytic capability for the reduction of p-nitrophenol with NaBH₄.

Keywords polymeric ionic liquid gold nanoparticles platinum nanoparticles core--satellite

Corresponding Author(s): Junbo LI

Online First Date: 13 January 2017 Issue Date: 22 January 2017

Cite this article:

Wenlan WU,Junbo LI,Sheng ZOU, et al. Construction of Au@Pt core--satellite nanoparticles based on in-situ reduction of polymeric ionic liquid protected gold nanoparticles[J]. Front. Mater. Sci., 2017, 11(1): 42-50.

URL:

https://academic.hep.com.cn/foms/EN/10.1007/s11706-017-0365-0
https://academic.hep.com.cn/foms/EN/Y2017/V11/I1/42

Fig.1 Scheme 1The schematic illustration of preparing Au@Pt core–satellite NPs and as the catalyst for the p-nitrophenol reduction.

Fig.2 (a) UV-vis spectrum and (b) TEM image of PMMPImB-@-Au NPs. (c) TGA analyses of PMMPImB (I) and PMMPImB-@-Au NPs (II). (d) DLS of PMMPImB-@-Au NPs.

Fig.3 (a) UV-vis spectra and (b) zeta-potentials of PMMPImB-@-Au NPs in presence of different volumes of PtCl₆²⁻.

Fig.4 (a) UV-vis spectra: PMMPImB-@-Au NPs (I); Au@Pt core–satellite NPs formed with PtCl₆²⁻ at 10 μL (II), 20 μL (III) and 30 μL (IV); Pt NPs formed by complex with PMMPImB and PtCl₆²⁻ at 30 μL (V). (b) DLS of Au@Pt core–satellite NPs.

Fig.5 TEM images: Au@Pt core–satellite NPs formed with PtCl₆²⁻ at (a) 10 μL, (b) 20 μL and (c) 30 μL; (d) Pt NPs formed by complex with PMMPImB and PtCl₆²⁻ at 30 μL.

Fig.6 UV-vis spectra of p-nitrophenol in the presence of (a) Au@Pt core–satellite NPs, (b) Pt NPs and (c) Au core template as catalysts. (d) The plot of ln(C_t/C₀) versus the reaction time of the three catalysts.

Fig.7 The conversion ratio of p-nitrophenol with Au@Pt core–satellite NPs as the catalyst in different cycles.

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