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The AuRe nanoalloy particles in molar ratio of 9:1 were prepared by sodium borohydride procedure, and modified by single strand DNA (ssDNA) to prepare an aptamer AuRe nanoprobe (AuRessDNA) for Hg2+. In the pH 7.0 Na2HPO4‐NaH2PO4 buffer solution and in the presence of NaCl, Hg2+ interacted with AuRessDNA to form double‐stranded T‐Hg2+‐T mismatched and release AuRe nanoparticles that aggregate to large...
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