In this study, gold nanoparticles were fabricated using two different functional groups such as crown ether and carboxylic acid and evaluated as a sensor to detect copper ions in an aqueous solution. The Au-crown/carboxylic is characterized with TEM, FTIR spectroscopy. To compare the response of the sensor to copper ions, the UV-vis spectrum was characterized before and after the increase of Cu2+ ions. The mechanism to be considered for measuring copper ions in aqueous solutions is that Cu2+ ions can successfully complexation with Au-crown/carboxylic which comes with color changes from red to blue. In the range of 75 nM to 1250 nM, the link between the decrease in adsorption intensity and the concentration of Cu2+ ions at A630/A545 is linear with 0.9814 and 150 nM correlation coefficient and the limit of detection, respectively. In other words, among several other cations, the sensor assay especially measures copper ions and also has very simple and able to measure and detect copper ions in an aqueous solution.


Nano probe, sensor, crown ethers, carboxylic acid, copper (II)



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