Synthesis Of Fluorescent Copper Nanoparticles And Sensitive Detection Of Anions And Cations

Copper nanoparticles are composed of dozens to hundreds of metal atoms.Because of their excellent optical properties and biocompatibility,copper nanoparticles have shown promising application prospects in sensing,catalysis,drug delivery and imaging in biomedicine.This work focuses on the synthesis,characterization and sensing of copper nanoparticles for inorganic anions and cations.The main contents include the following parts:(1)Copper nanomaterials with strong fluorescence were synthesized by using ascorbic acid as protective agent and reducing agent.Then the synthesis temperature,time,p H and molar ratio of copper nanoparticles were optimized.Nitrite ion can quench the fluorescence of copper nanomaterials to realize the sensing detection of nitrite ion.According to the temperature sensitive properties of the synthesized copper nanomaterials,copper nanomaterials can also be used as temperature sensors.The fluorescence intensity of copper nanomaterials shows a linear relationship at different temperatures.The temperature sensing of copper nanomaterials has been completed.The synthesized copper nanomaterials have potential application value in ion sensing detection and medical drug delivery.(2)In this work,copper nanomaterials were synthesized by a simple one-step method.We know that PDDA monomer is a macromolecule compound composed of halogen coordination compounds.It acts as a protective agent and template for Cu NPs.The synthesized high fluorescence Cu NPs have found that iodine ions in halogen elements can be detected.When iodine ions are added into the system,the fluorescence of Cu NPs will be quenched.This is because the synthesized Cu NPs have positive charges and electrostatic interaction adsorbs iodine ions with negative charges.In order to improve the fluorescence properties of Cu NPs,the conditions of temperature,reaction time,stability of Cu NPs and concentration of Cu SO4 were optimized.Finally,the iodine ion in the water samples of the Yellow River was detected by the internal standard method with good results.In addition,an interesting phenomenon was found in the experimental process.Cu NPs can be used as a catalyst to accelerate the catalytic reaction of methylene blue,which proves the application of copper nanomaterials in the field of catalysis.(3)In this experiment,fluorescent copper nanoparticles were synthesized with glucose as reducing agent.Based on the fluorescence quenching mechanism,a visualized fluorescence analysis method for Ag+ detection was constructed by using the prepared Glc-Cu NPs as fluorescence probe and heavy metal Ag+ as quenching agent.This method presents a good linear relationship of fluorescence quenching and realizes the recovery and detection of environmental water samples.Glc-Cu NPs is cheap and easy to obtain,and the analysis method is fast and simple.It has potential application value in environmental detection.(4)Carbon quantum dots(CDs)were prepared by hydrothermal synthesis of pure milk.The raw material of this method is novel and single.The synthesis method is one-step hydrothermal method.It is simple and environmentally friendly.The synthesized CDs have high luminescence intensity,non-toxicity,high stability and good biocompatibility.Furthermore,the synthesized fluorescent carbon quantum dots were applied to the detection of metal ions.Highly selective detection of Fe3+.The method has been applied to the determination of iron ions in water samples.It has potential application value in metal ion detection.