Ultrasensitive electrochemical biosensing platform based on spherical silicon dioxide/MOLYBDENUM SELENIDE (cas 12058-18-3) nanohybrids and triggered Hybridization Chain Reaction

Add time:08/01/2019    Source:sciencedirect.com

An ultrasensitive sandwich-type electrochemical biosensor for DNA detection is developed based on spherical silicon dioxide/molybdenum selenide (SiO2@MoSe2) and graphene oxide–gold nanoparticles (GO–AuNPs) hybrids as carrier triggered Hybridization Chain Reaction (HCR) coupling with multi-signal amplification. The proposed sensoring assay utilizes a spherical SiO2@MoSe2/AuNPs as sensing platform and GO–AuNPs hybrids as carriers to supply vast binding sites. H2O2+HQ system is used for DNA detection and HCR as the signal and selectivity enhancer. The sensor is designed in sandwich type to increase the specificity. As a result, the present biosensor exhibits a good dynamic range from 0.1 fM to 100 pM with a low detection limit of 0.068 fM (S/N=3). This work shows a considerable potential for quantitative detection of DNA in early clinical diagnostics.

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