Surface Modification of Au Nanorods and Their Interaction with H2O2†

doi:10.7503/cjcu20160930

Abstract

Abstract:

The interaction conditions for H₂O₂ with Au nanorods(Au NRs) were investigated by changing the concentrations of H⁺ and Br^- in the reaction solution. Au NRs with positively surface were modified by poly(sodium-styrenesulfonate)(PSS) via electrostatic interaction to detect the effect of different ligands on the interaction between H₂O₂ and Au NRs. Different PSS concentration led to the corresponding change in localized surface plasmon resonance(LSPR) absorption peak of Au NRs. The results demonstrated that the increase of H⁺ concentration led to the increase of etching reaction ratio of Au NRs. The role of Br^- was depicted as stabilizing gold ions during the etching process of Au NRs. PSS molecules on Au NRs inhibited the etching process. In addition, the stability of PSS-modified Au NRs had great relation with the concentration of PSS molecules. When the amounts of PSS and hexadceyl trimethyl ammonium bromide(CTAB) were the same, the zeta potential was zero. Thus, Au NRs were unstable. With increasing the amount of PSS, the surface zeta potential became negatively and the stability of Au NRs increased.

Key words: Au nanorods(Au NRs), Surface plasmon resonance, Poly(sodium-styrenesulfonate)(PSS), H2O2(Ed.: F K M)

CLC Number:

O611

TrendMD:

SHI Wen, SHAN Guiye, CHEN Yanwei. Surface Modification of Au Nanorods and Their Interaction with H₂ $O 2 †$ [J]. Chem. J. Chinese Universities, 2017, 38(4): 517.

Figures/Tables 6

Fig.1 UV-Vis-NIR spectra of Au NRs at different pH values

Fig.2 UV-Vis-NIR spectra of as-synthesized Au NRs(a, c) and centrifuged Au NRs(b, d), before(a, b) and after(c, d) incubating with 0.5 mL H2O2 for 12 h

Fig.3 Zeta surface potential(A) and UV-Vis-NIR spectra(B) of the Au NRs after adding

Fig.4 TEM images of centrifuged Au NRs after adding different concentrations of PSSc(PSS)/(mg·L-1): (A) 0.16; (B) 13; (C) 50; (D) 200.

Fig.5 LSPR change of Au NRs(A) and PSS-modified Au NRs(B) with 1 mL H2O2 at

Fig.6 UV-Vis-NIR spectra of Au NRs solutions after adding EDTA-Fe2+ and different concentrations of H2O2c(H2O2)/(mol·L-1): a—h. 6.2×10-5, 3.7×10-4, 1.8×10-3, 7.5×10-3, 0.03, 0.09, 0.27, 0.81. i. Au NRs.

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Surface Modification of Au Nanorods and Their Interaction with H₂ $O 2 †$

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