Dual-Channel Logic Gates Operating on the Chemopalette ssDNA-Ag NCs/GO Nanocomposites

In this work, we demonstrate that the emission wavelength and intensity of silver nanoclusters (Ag NCs) can be facilely tuned by the configuration transformation from the adsorption of Ag NCs to the graphene oxide (GO) surface to the desorption of Ag NCs from GO. Bicolor Ag NCs tethering the complementary sequence of influenza A virus genes are prepared, named green-emitting G-Ag NCs-CH5N1 (530 nm) and red-emitting R-Ag NCs-CH1N1 (589 nm). As for the high affinity of the complementary fragment of genes to GO, the adsorption of Ag NCs to GO leads to the formation of G-Ag NCs-CH5N1/GO and R-Ag NCs-CH1N1/GO nanocomposites, leading to fluorescent quenching due to energy transfer. By conjugating complementary sequences as capturing probes for targets, the formation of genes/Ag NC duplex-stranded structures results in the desorption of Ag NCs from GO, activating the fluorescence signal. More interestingly, compared with sole single-stranded DNA-templated fluorescent Ag NCs (ssDNA-Ag NCs), the activatable emission wavelength of the G-Ag NCs-CH5N1/H5N1 complex exhibits a notable red shift (555 nm) with a 49% recovery rate, while that of the R-Ag NCs-CH1N1/H1N1 complex shows a distinct blue shift (569 nm) with a 200% recovery rate. Via target-responsive configuration transformation of Ag NCs/GO hybrid materials, the emission wavelength and intensity of Ag NCs are effectively regulated. Based on the output changes according to different input combinations, novel dual-channel logic gates for multiplex simultaneous detection are developed by using the tunable color and intensity of ssDNA-Ag NCs. Our observation may open a new path for multiplex analysis in a facile and rapid way combining the logic gate strategy.