箭头形金纳米锥的湿法制备及性能研究

doi:10.7503/cjcu20180301

摘要/Abstract

摘要：

采用湿化学合成法制备了箭头形金纳米锥材料, 并研究了合成过程中生长溶液的组成对金纳米材料生长的影响. 利用透射电子显微镜、吸收光谱等手段对产物的晶体结构和光学性质进行研究, 讨论了材料的生长机理. 由于各向异性的箭头形金纳米锥具有良好的表面等离子体共振光学特性和更高的等离子体共振强度, 在表面局域电场增强及光热转化等应用方面比其它形貌的金属材料具有更强的优势. 与金纳米棒相比, 箭头形金纳米锥具有较好的SERS增强性质和光热转换效率. 文中还对材料的尖端形貌对纳米粒子边缘局域电场及光热性能的影响进行了讨论.

关键词: 金纳米锥, 表面等离子体共振, 光学性质, 光热转换效率

Abstract:

Au nanoshuttles(Au NSs) with arrow-head were synthesized via wet chemical method by adjusting the concentration of chemical precursors in the solution. The crystal structure and optical properties of Au nanoshuttles were researched by different characterization methods including transmission electron microscopy, UV-Vis-NIR absorption spectra and SERS spectra, etc. At the same time, the growth mechanism of Au nanoshuttles was discussed. Au nanoshuttles have good photothermal properties compared with Au nanorods. The anisotropic Au nanoshuttles with arrow ends feature the local surface plasmon resonance optical properties and possess more advantages than the metal materials with other morphology when they are used in the applications about enhanced local electric field and photothermal conversion. In addition, their photothermal conversion efficiency was calculated. The effect of arrow morphology on the photothermal properties of Au nanoshuttles was disscussed.

Key words: Au nanoshuttle, Surface plasmon resonance, Optical property, Photothermal conversion efficiency

中图分类号:

O611

TrendMD:

吴丹, 李曼, 钟瑶, 安奎生, 陈艳伟. 箭头形金纳米锥的湿法制备及性能研究. 高等学校化学学报, 2018, 39(8): 1617.

WU Dan, LI Man, ZHONG Yao, AN Kuisheng, CHEN Yanwei. Property of Au Nanoshuttles with Arrow-head Prepared via Wet Chemical Synthetic Method^†. Chem. J. Chinese Universities, 2018, 39(8): 1617.

图/表 9

Fig.1 TEM image(A) and the corresponding HRTEM image(B) of Au NSs

Fig.2 UV-Vis-NIR absorption spectra of Au NRs(a) and Au NSs(b)

Fig.3 UV-Vis-NIR absorption spectra of Au NSs prepared with different volume of AgNO3 solutionVolume of AgNO3 solution/mL: a. 18; b. 16;c. 14; d. 12.

Fig.4 UV-Vis-NIR absorption spectra of Au NSs prepared with different concentrations of HAuCl4 solutionc(HAuCl4)/(mol·L-1): a. 0.05; b. 0.04;c. 0.03; d. 0.02; e. 0.01.

Fig.5 UV-Vis-NIR absorption spectra of Au NSs prepared with different concentrations of AA solution

Fig.6 SERS spectra of 4-ATP molecules adsorbed on the Au NSs and Au NRs(A) and the 4-ATP absorbed on Au NSs with different concentrations(B)λex=785 nm.

Fig.7 Infrared images of Au NRs(A) and Au NSs(B) under 808 nm laser irradiation

Fig.9 Temperature variation at different time with laser irradiation(A) and time--lnθ plots of the cooling step(B) of Au NSs(a) and Au NRs(b) 808 nm laser irradiation(0.9 W/cm2) was used. Irradiation lasted for 21 min.

Fig.8 Temperature variation of Au NSs(a), Au NRs(b) and water(c) at different time with laser irradiation(A) and comparison photothermal stability of the Au NSs(a) and Au NRs(b)(B)λex=785 nm.

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