Chromotropic Acid 2R Stable Argentum Nanoclusters And Analytical Applications

In recent decades,with the rapid development of nanotechnology,argentum nanoclusters?Ag NCs?which are regarded as new fluorescent and light-emitting materials gradually become one of hot topics in the study of nanomaterials.Because Ag NCs have special optical,physical and chemical properties,they are widely applied to many fields such as biological detection,chemical analysis,electron,environmental monitoring and so on.Because Ag atoms are unstable and prone to reunite,in order to get the Ag NCs which can exist stably and have high fluorescence intensity,it is very necessary to add an appropriate material as the stabilizer in the process of producing argentum nanoclusters.Thus,in the experiments,the author takes chromotropic acid 2R as the stabilizer in the production of argentum nanoclusters.First of all,the author analyzes the research background and the research value of argentum nanoclusters.Secondly,the author explores the applications of Ag NCs which are stabilized by chromotropic acid 2R in Ag⁺detection.Then,the author explores the synthesis of Ag NCs which are regulated by pH and stabilized by chromotropic acid 2R,and their applications in the detection of acetic acid concentration.The main research contents are as follows:?1?Taking chromotropic acid 2R as the stabilizer and the probe,under the optimum experiment conditions,NaBH₄ can effectively restore the chromotropic acid 2R.With the increase of the concentration of Ag⁺,the fluorescence shows regular changes.Based on it,the author builds a method which can measure the argentum ions in solution.When the argentum ions'concentration range is between 5.0×10^-8 and 1.0×10^-6 mol·L^-1,there is a good linear relationship??I_F=7.78×10⁸c-33.41,correlation coefficient r=0.996 4?between the fluorescence enhancement values??I_F?and the Ag⁺concentration.Using this method,the lowest concentration of Ag⁺in the solution can be detected as 5.0×10^-8 mol·L^-1.?2?Taking chromotropic acid 2R as the stabilizer,sodium borohydride as the reductant,Berritan Robinson?BR?buffer solution as the first modifier for pH values in the reaction system,and sodium hydroxide solution as the second modifier for pH values,all of these construct a new method of synthesizing Ag NCs with strong fluorescent emission and stability.Under the optimum synthesis condition,using this method can produce argentum nanoclusters,and they have been characterized.In the experiment,it is found that the argentum nanoclusters'emission wavelength and fluorescence intensity will change with the change of the system pH value,and they have a good linear relationship.Based on the above properties of argentum nanoclusters,the author proposes that taking the argentum nanoclusters as the probes to construct pH fluorescent sensors used to detect the concentration of weak acid solution,and using the pH fluorescent sensors to detect the concentration of acetic acid solution under the optimal condition.The good experimental results have proved that it is feasible and practicable to use the pH fluorescent sensors to detect the concentration of weak acid solution.