期刊
ANALYST
卷 140, 期 12, 页码 4143-4147出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5an00008d
关键词
-
资金
- Natural Science Foundation of Jiangsu Province [BK20130349]
- National Natural Science Foundation of China [21275156, 31301495]
A novel photoelectrochemical (PEC) biosensor was fabricated based on N-doped TiO2 for the detection of Hg2+ through the quenching of photogenerated electrons. The N-doped TiO2 was synthesized by a sol-gel method with urea and tetrabutyl titanate as the N and Ti sources. Compared with the undoped TiO2, the N-doped TiO2 showed an enhanced photocurrent response under visible light (lambda > 420 nm). The sensing surface was functionalized with 5'-amino-modified T-rich oligonucleotides. The photoelectrochemical biosensor bound Hg2+ on the surface by a highly specific T-Hg2+-T recognition. Hg2+ on the surface of the N-doped TiO2 film withdrew the photogenerated electrons and decreased the recorded current signal. The dynamic linear range for Hg2+ has been determined to be as low as 2-6 mu M.
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