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In this paper, we propose a fluorescent and colorimetric sensor for Cu2+ ion based on formaldehyde modified hyperbranched polyethylenimine capped gold nanoparticles (F-hPEI Au NPs). The fluorescent sensor is prepared by one-pot synthesis, of which the fluorescence intensity could be quenched by Cu2+ ion. The response behavior of the sensor is dependent on the pH value of the solution. At pH 4.0, the...
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