Optic and catalytic properties of gold nanoparticles tuned by homopolymers

Gold nanoparticles (GNs) are prepared through in situ reduction using NaBH4 in the presence of homopolymer PDMAEMA. The sizes of the GNs can be adjusted by alternating the molar ratio of gold to DMAEMA. Pure PDMAEMA aqueous solution shows a phase-transition at 50℃ at pH 10 and 25℃ at pH 14, while PD...

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Bibliographic Details
Published in:Science China. Chemistry 2009-09, Vol.52 (9), p.1372-1381
Main Authors: Chen, Xi, Zhao, DongYun, Zhao, LiZhi, An, YingLi, Ma, RuJiang, Shi, LinQi, He, QiJun, Chen, Li
Format: Article
Language:English
Subjects:
Absorbance
Aqueous solutions
catalyst
Catalytic activity
Chemistry
Chemistry and Materials Science
Chemistry/Food Science
Gold
High temperature
homopolymer
Nanoparticles
Nitrophenol
Reduction
Temperature
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Summary:Gold nanoparticles (GNs) are prepared through in situ reduction using NaBH4 in the presence of homopolymer PDMAEMA. The sizes of the GNs can be adjusted by alternating the molar ratio of gold to DMAEMA. Pure PDMAEMA aqueous solution shows a phase-transition at 50℃ at pH 10 and 25℃ at pH 14, while PDMAEMA-supported GNs aqueous solution shows a phase-transition at 47℃ at pH 10 because of the increasing hydrophobic property resulting from GNs. Due to the pH and tempera-ture-responsible characteristics of PDMAEMA, the resulting PDMAEMA-supported GNs exhibit pH adjustable temperature-responsive characteristics in optic and catalytic aspects. Under an acidic condi-tion (pH 2), the GNs show unchanged surface Plasmon absorbance with a peak of 518 nm in a tem-perature range from 20 to 65℃. Under a basic condition (pH 10), the GNs first show the same absorb-ance with a peak at 518 nm in a temperature range from 20 to 40℃, and then the absorbance red shifts from 518 to 545 nm as temperature increases from 40 to 65℃. When the GNs are used as catalysts to catalyze the reduction of p-nitrophenol, the catalytic activity can be adjusted by changing the permeation of reactants in the PDMAEMA layer at low and high temperatures, respectively.
ISSN:1674-7291
1006-9291
1869-1870
1862-2771
DOI:10.1007/s11426-009-0154-4