A microwave preparation method of a single -divided gold and silver alloy nanoparticles
A nanoparticle and gold-silver alloy technology, applied in nanotechnology, metal processing equipment, transportation and packaging, etc., can solve the problems of limiting the efficiency of nanoparticles and slow heating rate, and achieve improved preparation efficiency, rapid and uniform heating, and high dispersibility good effect
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[0026] The invention provides a microwave preparation method of gold-silver alloy nanoparticles, comprising the following steps:
[0027] 1) Under protective gas, silver nitrate and oleylamine are mixed and subjected to reduction reaction to obtain silver nanoparticle organosol;
[0028] 2) carrying out microwave digestion after mixing the silver nanoparticle organosol, chloroauric acid and oleylamine obtained in the step 1);
[0029] 3) The product obtained in step 2) is washed with ethanol and centrifuged to obtain monodisperse gold-silver alloy nanoparticles.
[0030] In the present invention, silver nitrate and oleylamine are mixed and then subjected to reduction reaction under protective gas to obtain silver nano particle organic sol.
[0031] In the present invention, the type of the shielding gas is not particularly limited, and the shielding gas well known to those skilled in the art can be selected, and nitrogen is preferred in the present invention.
[0032] In the...
Embodiment 1
[0052] Dissolve 1 mmol of silver nitrate in 20 mL of oleylamine at room temperature. The above solution was rapidly heated to 140°C at a rate of 10°C / min and maintained at this temperature for 1 hour. The whole reaction chamber was carried out under the protection of nitrogen atmosphere and under the condition of magnetic stirring (700rpm). The reaction system is naturally cooled to room temperature, and the obtained product is organosol of silver nanoparticles.
[0053] 0.04 g of HAuCl 4 ·3H 2 O was dissolved in 10 mL of oleylamine, and maintained for 30 min under ultrasonic conditions of 200 W to obtain an oleylamine solution of chloroauric acid. Mix the oleylamine solution of chloroauric acid and the above-mentioned 0.8mL silver nanoparticle organosol in a microwave digestion tank, and then place it in a microwave digestion apparatus. The pressure of the microwave digestion instrument was set at 5 MPa, the temperature was set at 90°C, the heating rate was 20°C / min, and ...
Embodiment 2
[0055] When preparing gold-silver alloy nanoparticles, the volume of the silver organosol was changed to 0.3 mL, and other conditions were the same as in Example 1.
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