铜掺杂对金纳米棒生长及光学性质的影响

doi:10.7503/cjcu20170829

摘要/Abstract

摘要：

采用金-铜共混法制备了金纳米棒, 研究了铜离子存在下金纳米棒的等离子体共振吸收及形貌的变化. 通过调节反应中铜离子的加入量及晶体生长过程中各反应参数, 使金纳米棒复合纳米材料的形貌、长径比和光学性质得到有效控制. 比较了纯金纳米棒与掺入铜的金纳米棒的光热转换性能和拉曼光谱的增强性能. 结果表明, 铜离子的掺杂可以有效控制金纳米棒的生长以及金纳米棒的形貌. 加入铜离子的金纳米棒的光热转换效率明显低于单纯的金纳米棒, 但是铜掺杂的金纳米棒在被用作拉曼基底时, 表面增强拉曼性质却优于纯金纳米棒.

关键词: 金纳米棒, 铜离子, 光学性质, 表面等离子体共振

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

中图分类号:

O611

TrendMD:

李凯丰, 吴丹, 陈艳伟. 铜掺杂对金纳米棒生长及光学性质的影响. 高等学校化学学报, 2018, 39(5): 855.

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

图/表 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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