Rapid determination of copper ions using heat-treated bare gold nanoparticles as chromogenic probes
A rapid determination and nano-gold technology, which is applied in the field of analytical chemistry and nanometers, can solve the problems of complex detection steps and low sensitivity, and achieve the effects of high detection sensitivity, fast detection speed, and simple and fast heat treatment process
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Embodiment 1
[0035] Preparation of heat-treated bare gold nanoparticles: First, 500 μL of 0.1 g / L chloroauric acid aqueous solution was diluted with 39.5 ml of water, and 0.8 ml of 0.1 g / L sodium borohydride aqueous solution was added under vigorous stirring (the addition time was controlled Within 5 minutes), the color of the reaction solution changed from light yellow to wine red, and continued rapid stirring for 1 hour in the dark to obtain bare gold nanoparticles. The obtained bare gold nanometer solution was heated in a constant temperature water bath at 70° C. for 5 minutes to obtain heat-treated bare gold nanometer. The heat-treated bare gold nanometer solution is wine red, with a maximum absorption wavelength of 515 nm (see figure 1 ). All glassware used in the above process was soaked in aqua regia, washed thoroughly with double distilled water, and dried.
Embodiment 2
[0037] Copper ions interact with heat-treated bare gold nanoparticles: 0.2 milliliters of phosphate buffer solution containing 6 μmol / L copper ions was added to 0.2 milliliters of the heat-treated bare gold nanoparticles prepared in Example 1 (the concentration of the phosphate buffer solution is 0.01 mol / L , pH=8), react at 70°C for 5 minutes. The color of bare gold nanoparticles changes from wine red to blue, and the maximum absorption wavelength is red-shifted (see figure 2 ).
Embodiment 3
[0039] Copper ions interact with heat-treated bare gold nanoparticles: 0.2 milliliters of phosphate buffer solution containing 2.5 μmol / L copper ions was added to 0.2 milliliters of the heat-treated bare nano-gold prepared in Example 1 (the concentration of the phosphate buffer solution is 0.01 mol / L , pH=6-12), react at 70°C for 5 minutes, and measure the absorbance ratio A 650 / A 515 . like image 3 As shown, the absorbance ratio A 650 / A 515 It reaches a maximum at pH=8.
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