Chem. J. Chinese Universities ›› 2021, Vol. 42 ›› Issue (3): 700.doi: 10.7503/cjcu20200561

• Inorganic Chemistry • Previous Articles     Next Articles

Seedless Synthesis of Gold Nanorods with Narrow Absorption Using Binary Surfactant Mixture

LU Feng, GONG Yi, ZHAO Ting, ZHAO Ning, JU Wenwen, FAN Quli(), HUANG Wei   

  1. Key Laboratory for Organic Electronics and Information Displays & Jiangsu Key Laboratory for Biosensors,Jiangsu National Synergetic Innovation Center for Advanced Materials,Nanjing University of Posts & Telecommunications,Nanjing 210023,China
  • Received:2020-08-14 Online:2021-03-10 Published:2021-03-08
  • Contact: FAN Quli E-mail:iamqlfan@njupt.edu.cn
  • Supported by:
    ? Supported by the National Natural Science Foundation of China(21975131)

Abstract:

A seedless synthetic method was developed for the preparation of high-quality gold nanorods(AuNRs) using binary surfactant mixture containing hexadecyltrimethylammonium bromide(CTAB) and sodium oleate(NaOL). The morphologies, optical properties and photothermal performances were charac- terized by means of transmission electron microscopy(TEM), UV-Vis-NIR spectroscopy and infrared thermal imaging system. The results indicate that uniform AuNRs can be obtained with a NaOL concentration between 8.21—11.5 mmol/L, and their longitudinal surface plasmon resonance(LSPR) wavelength can be tuned from 650 nm to 1150 nm. The AuNRs prepared with this method exhibited narrow LSPR peak, especially in the second near infrared-Ⅱ region(NIR-Ⅱ, λ>1000 nm). Under the irradiation of 1064 nm laser, the temperature of AuNRs solution can increase to 67 ℃, with a photothermal conversion efficiency of 31.5%. The AuNRs also exhibited excellent photothermal stability under laser irradiation, which can be useful for photoacoustic imaging and photothermal therapy in the second near-infrared region.

Key words: Gold nanorods, Seedless synthesis, Sodium oleate, Photothermal therapy, Near infrared-Ⅱ (NIR-Ⅱ) region

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