Crystal seed growth method for preparing gold nano-particles
A seed growth method, a technology of gold nanoparticles, applied in nanotechnology and other directions, can solve the problems of uneven morphology, toxicity, poor monodispersity of gold nanoparticles, etc.
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[0015] Specific embodiment 1: This embodiment is a seed growth method for preparing gold nanoparticles, which is specifically carried out in the following steps:
[0016] 1. The preparation of gold seed: the HAuCl with a mass fraction of 1% 4 The aqueous solution was added to deionized water, and the temperature was raised from room temperature to 99°C at a speed of 250rpm, and then a 1% sodium citrate aqueous solution was added at a speed of 600rpm~1200rpm and a temperature of 99°C. After reacting at 600rpm~1200rpm and temperature of 99℃ for 15min~20min, stop stirring and heating, and cool to room temperature naturally to obtain a small particle size spherical gold nanoparticle solution; the mass fraction of 1% HAuCl 4 The volume ratio of aqueous solution to deionized water is 1: (90-100); the mass fraction is 1% HAuCl 4 The volume ratio of the aqueous solution to the 1% sodium citrate aqueous solution is 1:(3~5);
[0017] 2. Preparation of gold nanoparticles by seed growth method:...
Example Embodiment
[0022] Specific embodiment two: this embodiment is different from specific embodiment one in that: in step one, HAuCl with a mass fraction of 1% 4 The aqueous solution was added to deionized water, heated from room temperature to 99°C at a speed of 250rpm, and then a 1% sodium citrate aqueous solution was added under the conditions of a speed of 1000rpm and a temperature of 99°C, at a speed of 1000rpm and After reacting at a temperature of 99° C. for 15 minutes, the stirring and heating are stopped, and the solution is naturally cooled to room temperature to obtain a spherical gold nanoparticle solution with a small particle diameter. Others are the same as the first embodiment.
Example Embodiment
[0023] Specific embodiment three: this embodiment is different from one of specific embodiments one to two in that the mass fraction of HAuCl described in step one is 1% 4 The volume ratio of aqueous solution to deionized water is 1:100. Others are the same as one of specific embodiments one to two.
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