Synthesis of Au-Ni Bimetallic Nanoparticles with Tunable Aspect Ratio†

doi:10.7503/cjcu20170145

Abstract

Abstract:

In this paper, the Au-Ni bimetallic nanoparticles with tunable aspect ratio of Au to Ni were synthesized by noble-metal-induced-reduction strategy. Octadecylamine is reducible at high temperatures thus it was used as a reducing agent. As the temperature increased gradually, Au³⁺ was reduced by octadecylamine to form Au⁰. After that, Ni²⁺ was reduced to Ni⁰ by obtaining electrons from Au⁰ at 220 ℃. Octadecylamine provided electrons to Au³⁺ continuously during the reaction. The size of Ni side could be tunable by changing the reaction time at 220 ℃. Au side and Ni side could be selectively etched with aqueous I₂/KI and 0.5%(mass fraction) aqueous HCl, respectively. The size of Au-Ni bimetallic nanoparticles could be tuned continuously by etching for varied time. Au side or Ni side could be completely etched separately, remaining Ni nanoparticles or Au nanoparticles. The fresh surface obtained after etching Au side or Ni side provided a site of chemical reaction for further compositing functional substances. This method is attractive owing to the easiness to continuously tuning aspect ratio of the bimetallic nanoparticles. On the other hand, composition of the bimetallic nanoparticles is also flexibly tunable using different reactants.

Key words: Bimetallic nanoparticles, Reaction time, Selectively etching, Morphology control

CLC Number:

O614

TrendMD:

HAN Tianhao, LIANG Fuxin, YANG Zhenzhong. Synthesis of Au-Ni Bimetallic Nanoparticles with Tunable Aspect Ratio^†[J]. Chem. J. Chinese Universities, 2017, 38(11): 1921.

Figures/Tables 8

Scheme 1 Continuously tuning aspect ratio of Au-Ni bimetallic nanoparticles by wet etching

Fig.1 HRTEM image(A), line-scanning EDS analysis(B), XRD pattern(C) and dispersibility and magnetic response in THF(D) of the Au-Ni bimetallic nanoparticles after reaction for 10 min

Fig.2 TEM images of the Au-Ni nanoparticles after reaction for 5(A), 10(B) and 15 min(C)

Fig.3 UV-Vis spectra(A) and DLS result(B) of the Au-Ni nanoparticles after reaction for 5 min(a), 10 min(b) and 15 min(c)

Fig.4 TEM images of Au-Ni bimetallic nanoparticles after being etched with aqueous I2/KI for 5 min(A), 10 min(B) and 15 min(C)The insets illustrate the corresponding Janus particles.

Fig.5 UV-Vis spectra(A)and DLS result(B) of the Au-Ni bimetallic nanoparticles after being etched for 5 min(a), 10 min(b) and 15 min(c)

Fig.6 TEM images of Au-Ni bimetallic nanoparticles after being etched with 0.5% aqueous HCl for 10 min(A), 30 min(B) and 50 min(C) The insets illustrate the corresponding Janus particles.

Fig.7 UV-Vis spectra(D) and DLS result(E) of the Au-Ni bimetallic nanoparticles after being etched for 10 min(a), 30 min(b) and 50 min(c)

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