A Highly Sensitive and Selective Colorimetric Hg2+ Ion Probe Using Gold Nanoparticles Functionalized with Polyethyleneimine

<div>Mass peaks for (a) (CH2)2NHg2+ (m/z: 242), (b) CH2CH2(CH2)2NHg2+ (m/z: 270), and (c) (CH2)2NHg2+N(CH2)CH2CH2 (m/z: 298) fragments in TOF-SIMS spectra of PEI-AuNPs (black) and PEI-AuNPs-Hg2+ (red). These molecular fragments are expected based on PEI-AuNPs-Hg2+ structural elements in the zoomed circle in Scheme .</div>

Journal of Analytical Methods in Chemistry

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Figure 4: A Highly Sensitive and Selective Colorimetric Hg2+ Ion Probe Using Gold Nanoparticles Functionalized with Polyethyleneimine