A preparation method of gold nanorods whose aspect ratio can be adjusted in a wide range

A gold nanorod, a large-scale technology, applied in the field of preparation of gold nanorods, to achieve high yield, solve the problems of biological toxicity and biological modification, and improve the effect of properties
CN102284705AInactive Publication Date: 2011-12-21SOUTHEAST UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SOUTHEAST UNIV
Publication Date
2011-12-21
Estimated Expiration
Not applicable · inactive patent

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Abstract

The present invention is a preparation method of gold nanorods whose length-to-diameter ratio can be adjusted in a large range. The strong reducing agent sodium borohydride reduces tetrachloroauric acid to obtain gold seed solution; the preparation of growth solution: prepare the mixed solution of hexadecyltrimethylammonium bromide, tetrachloroauric acid and silver nitrate, and the mol ratio of the three is 20:1:0.1~20:1:5, add crotonic acid solution to obtain a growth solution; growth of gold nanorods: inject gold seed solution into the growth solution, react for 6-12 hours, and obtain gold nanorods. The invention adopts crotonic acid as growth solution modifier, and solves the biological toxicity and biological modification problems caused by CTAB. The yield of the short-length-diameter ratio gold nanorods prepared can be as high as about 90%, the size distribution is narrow, and the length-diameter ratio is about 1.92. The aspect ratio of the prepared gold nanorods can be adjusted in a wide range from 1.9 to 7.5.
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Description

Technical field:

[0001] The invention relates to the technical field of nanomaterial preparation, in particular to a method for preparing gold nanorods with adjustable aspect ratios. Background technique:

[0002] The physicochemical and photoelectric properties of gold nanoparticles are closely related to their shape and size. The aspect ratio of common gold nanorods is 2-7. Due to the quasi-one-dimensional shape, the surface plasmon resonance absorption peak is split into two, near 520nm The transverse surface plasmon resonance absorption peak and a special longitudinal surface plasmon resonance absorption peak, where the position of the longitudinal surface plasmon resonance absorption peak can be adjusted by changing the aspect ratio of gold nanorods, spanning from the visible region to the near-infrared region. Gold nanorods have special nanometer characteristics, which make them have broad application prospects in the fields of biomedical chemical catalysis, optical ...

Claims

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