An Aptamer-Au/MnO2 Nanoprobe for Trace Hg2+ Using Resonance Scattering Method

Jin Qiao Long; Hui Min Qin; Ai Hui Liang

doi:10.4028/www.scientific.net/AMR.668.375

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HomeAdvanced Materials ResearchAdvanced Materials Research Vol. 668An Aptamer-Au/MnO2 Nanoprobe for Trace Hg2+ Using...

An Aptamer-Au/MnO₂ Nanoprobe for Trace Hg²⁺ Using Resonance Scattering Method

Abstract:

The Au/MnO2 nanoalloy in diameter of 10 nm were prepared, using sodium citrate as the stabilizing agent and NaHB4 as the reductant. An aptamer Au/MnO2 nanoprobe (Apt-Au/MnO2) for Hg2+ was prepared using the aptamer modified. In the pH 7.0 Na2HPO4-NaH2PO4 and NaCl, The nanoprobe reacted with Hg2+ to form double-stranded T-Hg2+-T mismatches, and the released Au/MnO2 nanoparticles aggregated to big particles, which induced an increase in the resonance scattering (RS) signal at 570 nm. The RS signal was linear to the concentration of Hg2+ in the range of 0.1-7.5 nmol/L, with detection limit of 0.06 nmol/L Hg2+. This aptamer modified nanoalloy RS method was applied to detect Hg2+ in water samples, with satisfactory results.

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Periodical:

Advanced Materials Research (Volume 668)

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375-378

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.668.375

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Online since:

March 2013

Authors:

Jin Qiao Long, Hui Min Qin, Ai Hui Liang

Keywords:

Aptamer, Au/MnO₂ Nanoalloy, Hg²⁺, Resonance Scattering Spectral Method

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