Chemical Research in Chinese Universities ›› 2024, Vol. 40 ›› Issue (2): 311-319.doi: 10.1007/s40242-024-3289-0

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Seedless Synthesis of Gold Nanorods with 5—10 nm in Diameters: a Comprehensive Study

LI Yalan, XIA Yunsheng   

  1. Anhui Province Key Laboratory of Biomedical Materials and Chemical Measurement, Key Laboratory of Functional Molecular Solids, Ministry of Education, College of Chemistry and Materials Science, Anhui Normal University, Wuhu 241000, P. R. China
  • Received:2023-12-03 Revised:2024-02-27 Online:2024-04-01 Published:2024-03-27
  • Contact: XIA Yunsheng xiayuns@mail.ahnu.edu.cn
  • Supported by:
    This work was supported by the National Natural Science Foundation of China (No. 22274001).

Abstract: Small gold nanorods (AuNRs), namely AuNRs with less than 10 nm in diameter, possess a high absorption-to-scattering ratio, a large surface area-to-volume ratio, as well as high cellular uptake behaviors. In this study, we systematically investigate seedless synthesis of AuNRs with diameters ranging from 5 nm to 10 nm. It has been found that several experimental conditions, including the chain length of the used cationic surfactants, and the concentrations of ascorbic acid, NaBH4, and AgNO3 can profoundly affect the obtained products. Under optimal conditions, the production yields of the obtained several AuNRs with different diameters can exceed 90% and even reach almost 100%. The conversion of gold precursors to AuNRs was estimated to be 70%—77% as measured by absorption spectroscopy and inductively coupled plasma mass spectrometry.

Key words: Small gold nanorod, Diameter, Production yield, Conversion rate