A Highly Sensitive and Selective Colorimetric Hg<sup>2+</sup> Ion Probe Using Gold Nanoparticles Functionalized with Polyethyleneimine

<div><sup>13</sup>C NMR spectrums for (a) PEI and (b) PEI-AuNPs in <sup>2</sup>H<sub>2</sub>O at room temperature.</div>

Journal of Analytical Methods in Chemistry

Figure 3: A Highly Sensitive and Selective Colorimetric Hg<sup>2+</sup> Ion Probe Using Gold Nanoparticles Functionalized with Polyethyleneimine 