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TEM images of (a) the H-AuNS probe prior to the reaction; and the H-AuNS probe (b) without and (c) with Hg(II) (1.0 μM) in the presence of HCl/Au(III)/H2O2 solution. (d) EDX spectrum of the H-AuNS probe with Hg(II) in the presence of HCl/Au(III)/H2O2 solution.
