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A technology of gold nanorods and gold species, which is applied in the field of synthesis of nanomaterials, can solve the problems of difficult to obtain high-yield gold nanorods, small-sized gold nanorods with high yield, large size of gold nanorods, etc., and achieve low production cost , good reproducibility and simple operation
Inactive Publication Date: 2013-07-17
GUANGZHOU CLUSTERBIOPHOTON TECH CO LTD
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However, the disadvantage of preparing gold nanorods by the seed crystal method is that the experimental procedure is relatively complicated and there are many control factors—for example, it is required to carefully control multiple process parameters of the growth liquid and the seed liquid, and more importantly, the obtained gold nanorods The size of gold nanorods is relatively large, usually 10-20nm in diameter, and it is difficult to obtain high-yield, smaller-diameter gold nanorods
Therefore, the existing non-seed growth method is difficult to achieve high yield to prepare small-sized gold nanorods
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[0043] A preparation method of gold nanorods, comprising the steps of:
[0044] 1) Add chloroauric acid solution and an optional gold species formation regulator to CTAB solution, then add silver nitrate solution, weak reducing agent and strong reducing agent, and react at a constant temperature of 25-40°C for 5-30 minutes to obtain reaction solution A;
[0045] 2) Adding at least one of the silver nitrate solution and the gold nanorod growth regulator solution to the reaction solution A to obtain the reaction solution B, and continue the reaction to obtain the gold nanorods.
[0046] Preferably, in the reaction solution A, the final concentration of CTAB is 0.06-0.12 M, and the final concentration of chloroauric acid is 0.04-0.08 mM.
[0047] Preferably, the reaction solution B is transferred to a constant temperature environment of 15-90° C., and the gold nanorods are grown for 0.1-24 hours.
[0048] The gold seed generation regulator is selected from sodium chloride, C 3～8 ...
Embodiment 1
[0056] Take 5mL 0.1M CTAB (containing 6.8mg NaCl) in a 25mL beaker, add 500μL chloroauric acid solution to the beaker, add 32.5μL silver nitrate solution, 50μL ascorbic acid solution, stir, then add 3μL sodium borohydride solution , transferred to a water bath at 30°C for 11 minutes, added 5 mL of deionized water, 32.5 μL of silver nitrate solution, and 5 μL of heterogeneous crystal nucleus ZnO during stirring, and transferred to a 22°C cooling cycle tank for growth for 24 hours.
Embodiment 2
[0058] Example 2 is similar to Example 1, except that after a 30°C water bath, the amount of silver nitrate solution is changed to 40 μL, the heterogeneous crystal nucleus is changed to 0.1M aluminum sulfate solution, and other conditions remain unchanged.
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Abstract
The invention discloses a method for preparing gold nano-rods. The method includes the steps: adding chloroauric acid solution and optional gold seed generating regulating agents into CTAB (cetyl trimethyl ammonium bromide) solution, adding silver nitrate solution, weak reducing agents and strong reducing agents into the CTAB solution and reacting at the constant temperature of 25-40 DEG C for 5-30min to obtain reaction liquid A; and adding silver nitrate solution, optional gold nano-rod growth regulating agent solution and water into the reaction liquid A to obtain reaction liquid B, and continuing reaction to obtain the gold nano-rods. The method is simple in process and operation and fine in reproducibility, the diameter of coverage of the prepared gold nano-rods is as small as 5nm to tens of nanometers, LSPR (localized surface plasmon resonance) peak value coverage in the length direction ranges from 630nm to 1010nm, counts in a TEM (transmission electron microscopy) graph indicate that more than 90% of rod products among obtained gold nano-particle products are high in rod yield, and the ratio of an LSPR peak value to a TSPR (transverse surface plasmon resonance) peak value is not lower than 2 in a UV-Vis (ultraviolet visible) absorption spectrogram. Raw materials used in the method are widely and easily obtained, and production cost is low.
Description
technical field [0001] The invention relates to a method for synthesizing nanomaterials, in particular to a method for preparing small-sized gold nanorods. Background technique [0002] Gold nanoparticles have outstanding surface plasmon resonance properties. This special property comes from the interaction between the incident light and the free electrons of the gold nanoparticles: when the wavelength of the incident light resonantly couples with the vibration frequency of the free electrons, surface plasmon resonance (SPR) occurs, It shows strong absorption peaks in the UV-Vis spectrum. The position of the SPR peak mainly depends on the following factors: the size, shape, surface charge, and environmental medium conditions of nanoparticles. [0003] Compared with spherical gold nanoparticles, rod-shaped gold nanoparticles have more special SPR properties. Spherical gold nanoparticles exhibit a single SPR peak, while rod-shaped gold nanoparticles have two SPR peaks, late...
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