The dna electrochemical sensor was prepared by self - assembling the designed hepatitis b virus dna specific probe on the surface of au electrode together with hoechst 33258 as electro - active indicator 利用自组装单分子膜法,将人工合成的乙肝病毒单链dna片断作为特异性探针固定在金电极表面,结合电活性指示剂hoechst33258构成dna电化学传感器。