A wireless magnetoelastic sensor (WMS) for uranyl detection has been developed using DNAzyme-graphene oxide (GO) and gold nanoparticles (AuNPs)-based amplification. The WMS is fabricated by immobilizing a layer of GO film on a magnetoelastic ribbon-like sensor. When the substrate strand of DNAzyme was cleaved in the presence of UO22+, the single-stranded DNA (ssDNA) was adsorbed onto the GO film of the WMS, resulting in a decrease of resonance frequency of the WMS. HAuCl4 can be reduced by ascorbic acid (AA) to atom Au coated on AuNPs in cetyltrimethyl ammonium bromide (CTMAB) solution, leadin...
