Effect of Copper Doping on the Growth and Optical Properties of Au Nanorods†

doi:10.7503/cjcu20170829

Abstract

Abstract:

In this paper, copper doped gold nanorods(Cu-Au NRs) were prepared by gold-copper blending method. The plasmon resonance absorption and morphological changes of Cu-Au NRs were investigated. The morphology, aspect ratio and optical properties of Cu-Au NRs were effectively controlled by adjusting the amount of Cu ions during crystal growth process. Finally, the photothermal conversion and Raman enhancement properties of Au NRs and Cu-Au NRs were investigated. The results show that copper ion doping could effectively control the morphology and the growth of Au NRs. The photothermal conversion efficiency of Cu-Au NRs is obviously lower than that of the Au NRs, but the surface enhanced Raman properties of Cu-Au NRs are better than that of Au NRs.

Key words: Gold nanorod, Copper ion, Optical property, Surface plasmon resonance

CLC Number:

O611

TrendMD:

LI Kaifeng,WU Dan,CHEN Yanwei. Effect of Copper Doping on the Growth and Optical Properties of Au Nanorods^†[J]. Chem. J. Chinese Universities, 2018, 39(5): 855.

Figures/Tables 8

Fig.1 UV-Vis absorption spectra of Au NRs(A) and Cu-Au NRs(B) at different reaction time

Fig.2 TEM images of Au NRs(A) and Cu-Au NRs(B)

Fig.3 UV-Vis-NIR absorption spectra of Au NRs interacted with different volumes of copper ions added(a—i: 5, 6, 7, 8, 9, 10, 15, 20 and 30 μL) in the growth process(A) and the linear correlation between longitudinal plasma resonance absorption peak of Au NRs and copper ion volume(B)

Fig.4 TEM images of Cu-Au NRs with different volumes of copper ions (A) 5 μL; (B) 7 μL; (C) 10 μL; (D) 15 μL; (E) 20 μL; (F) 30 μL.

Fig.5 XRD patterns of Au NRs(a) and Cu-Au NRs(b)

Fig.6 Photothermal curves of Au NRs(a) and Cu-Au NRs with different volumes of copper ions added[5—30 μL(b—f)] and with water(g)(A), and the corresponding photothermal conversion efficiency(B) and linear fitting curves(C) (C) a. Au NRs, R2=0.9946; b. V(Cu2+)=5 μL, R2=0.9987; c. V(Cu2+)=7 μL, R2=0.9976; d. V(Cu2+)=10 μL, R2=0.9984; e. V(Cu2+)=20 μL, R2=0.9996; f. V(Cu2+)=30 μL, R2=0.9970.

Fig.7 Infrared thermal images of Au NRs(A) and 5 μL Cu-doped Au NRs(B) under laser irradiation for different time Excitation wavelength is 808 nm.

Fig.8 Raman spectra of Cu-Au NRs@4-ATP(a) and Au NRs@4-ATP(b) with 785 nm excitation wavelength(A) and 633 nm excitation wavelength(B) and Raman spectra of 4-ATP(a) and R6G(b) adsorbed on the surface of Cu-Au NRs(C)

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