Highly Sensitive SERS Detection of Hg<sup>2+</sup> Ions in Aqueous Media Using Gold Nanoparticles/Graphene Heterojunctions
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Abstract
Gold nanoparticles (AuNPs)/reduced
graphene oxide (rGO) heterojunctions were synthesized directly on
SiO<sub>2</sub>/Si substrates via a seed-assisted growth process.
The in situ chemical fabrication strategy has been proven to be quite
simple and efficient for generating highly active surface-enhanced
Raman scattering (SERS) substrates due to synergistic enhanced protocol
from rGO and AuNPs. The SERS substrates with AuNPs/rGO heterojunctions
have been utilized for trace analysis of mercury(II) ions via thymine–Hg<sup>2+</sup>–thymine coordination. Thereby, very low limits of
detection, i.e., 0.1 nM or 20 ppt for Hg<sup>2+</sup>, can be achieved
in contrast with some other SERS subsrtates, which suggests that the
heterojunctions are appropriate as versatile surface-enhanced substrates
applied in chemical sensing or biosensing