The application discloses a fluorescent double-emission ssDNA-
silver cluster probe for rapidly and visually detecting Hg 2+ and a preparation method thereof. The application discloses a fluorescent double-emission ssDNA-
silver cluster probe for rapidly and visually detecting Hg 2+ , which contains a template ssDNA capable of simultaneously emitting strong
red fluorescence and weak green
fluorescence. The sequence of the ssDNA is 5'-AACAAAGCCCCCCCCCCCCCTTTTTTTTTT-3'. The fluorescent double-emission ssDNA-
silver cluster probe can rapidly and visually detect Hg 2+ . The ssDNA-silver cluster probe has excellent selectivity for Hg 2+ , and has been used for
rapid detection of trace Hg 2+ in actual water samples, and the detection result is sensitive and accurate.