Method for preparing Ag@Au core-shell nano material and method for detecting mercury ions by Ag@Au core-shell nano material
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A technology of core-shell nanomaterials and mercury ions, which is applied in the direction of material electrochemical variables, can solve the problems of special instruments and special reagents that are expensive and cannot be widely used, and achieve good sensitivity, good specificity, and high accuracy. Effect
Inactive Publication Date: 2016-09-28
TAIYUAN UNIV OF TECH
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[0002] The detection method to mercury ion mainly contains atomic spectrometry (OresteE., JesusA., OliveiraR., SilvaM., VieiraM., RibeiroA., 2013.Microchem.J.109,5-9. and ElandJ., FeifelR., 2004 .J.Phys.Chem.A.108, 9721-9725.), Inductively Coupled Plasma-Mass Spectrometry (HongY., RifkinE., BouwerE., 2011.Environ.Sci.Technol., 45(15), 6429-6436 and JacksonB., TaylorV., BakerR., Miller, E., 2009.Environ.Sci.Technol., 43(7), 2463-2469.) and fluorescence method (ZhuY., MaT., RenT., YuanZ., 2014.AC
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[0021] A preparation method of Ag@Au core-shell nanoparticles, according to the following steps
[0022] Step 1. Dissolve 1-1.8 milliliters of chloroauric acid (aqueous solution mass percent concentration of 1%) in 100-180 milliliters of secondary water, heat to boiling, then add 2.5-4.5 milliliters of trisodium citrate (aqueous solution mass percent concentration of 1%), continue to heat, the color of the solution changes from grayish yellow to deep red, continue to heat for 15 minutes, then cool to room temperature, and prepare nano gold; figure 1 It can be seen that the diameter of gold nanoparticles is about 16 nm, from figure 1 It is known that gold nanoparticles have a smooth surface and a nanosphere structure with a homogeneous structure.
[0023]Step 2: Take 8-14.4 milliliters of nano-gold solution, add 0.65-1.17 milliliters of polyvinylpyrrolidone (the concentration of the aqueous solution is 1%), stir for 5 minutes, and then add 85-153 microliters of ascorbic acid a...
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Abstract
The invention relates to the field of detection of mercury ions in environments and particularly relates to preparation of an Ag@Au core-shell structure modified by desoxyribonuclease. The Ag@Au core-shell structure is applied to construction of an electrochemical DNA (Deoxyribonucleic Acid) sensor for detecting the mercury ions. According to a method for preparing a Ag@Au core-shell nano material and a method for detecting the mercury ions by the Ag@Au core-shell nano material, the Ag@Au core-shell structure is prepared and nano particles are modified by the desoxyribonuclease; the Ag@Au core-shell structure is used as a label for constructing the electrochemical DNA sensor for detecting heavy metal ions Hg<2+>. The preparation method of the nano material is simple and rapid and is low in cost; the DNA sensor taking the nano material as the label has relatively good selectivity, stability and repeatability.
Description
technical field [0001] The invention relates to the field of detection of mercury ions in the environment, in particular to preparing a deoxyribozyme-modified Ag@Au core-shell structure and using it to construct an electrochemical DNA sensor for detecting mercury ions. Background technique [0002] The detection method to mercury ion mainly contains atomic spectrometry (OresteE., JesusA., OliveiraR., SilvaM., VieiraM., RibeiroA., 2013.Microchem.J.109,5-9. and ElandJ., FeifelR., 2004 .J.Phys.Chem.A.108, 9721-9725.), Inductively Coupled Plasma-Mass Spectrometry (HongY., RifkinE., BouwerE., 2011.Environ.Sci.Technol., 45(15), 6429-6436 and JacksonB., TaylorV., BakerR., Miller, E., 2009.Environ.Sci.Technol., 43(7), 2463-2469.) and fluorescence method (ZhuY., MaT., RenT., YuanZ., 2014.ACSAppl.Mater.Interfaces.6, 16344-16351. and LiuX., ShuX., ZhouX., ZhangX., ZhuJ., 2010.J.Phys.Chem.A.114, 13370-13375), etc., although these The method has the characteristics of sensitivity and a...
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