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A sensitive photoelectrochemical (PEC) aptasensor has been successfully constructed for oxytetracycline (OTC) biosensing based on a signal “switch off-on” strategy. When the conjugates of hairpin DNA probe and CdTe QD (H-DNA@QD) was immobilized on the ITO/TiO2 electrode by AuS bonds to form an ITO/TiO2/H-DNA@QD system, CdTe QDs at 3′ end of hairpin DNA close to the electrode surface led to the relatively...
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