期刊
BIOSENSORS & BIOELECTRONICS
卷 91, 期 -, 页码 456-464出版社
ELSEVIER ADVANCED TECHNOLOGY
DOI: 10.1016/j.bios.2016.12.059
关键词
TiO2 NPs/N-GQDs/g-C3N4 QDs; pcDNA3-HBV; Photoelectrochemistry
类别
资金
- China Postdoctoral Science Foundation [2016M592125]
- National Natural Science Foundation of China [21405059, 81600469, 21575050, 21505051]
- Key Research and Development Program of Shandong Province, China [2015GGH301001]
- Technology Research Project of Shandong Provincial Education Department [J15LC07]
- Graduate Innovation Foundation of University of Jinan [YCXB15004]
- Taishan Scholar Professorship of Shandong Province and UJN [ts20130937]
Herein, TiO2 nanopillars (NPs)/N-doped graphene quantum dots (N-GQDs)/g-C3N4 QDs heterojunction efficiently suppressed the photogenerated charges recombination and improved photo-to-current conversion efficiency. The introduced N-GQDs and g-C3N4 QDs could result in more effective separation of the photogenerated charges, and thus produce a further increase of the photocurrent. TiO2 NPs/N-GQDs/g-C3N4 QDs were firstly applied as the photoactive materials for the fabrication of the biosensors, and the primers of pcDNA3-HBV were then adsorbed on the TiO2 NPs/N-GQDs/g-C3N4 QDs modified electrode under the activation of EDC/NHS. With increase of the pcDNA3-HBV concentration, the photocurrent reduced once the double helix between the primers and pcDNA3-HBV formed. The developed photoelectrochemical (PEC) biosensor showed a sensitive response to pcDNA3-HBV in a linear range of 0.01 fmol/L to 20 nmol/L with a detection limit of 0.005 fmol/L under the optimal conditions. The biosensor exhibited high sensitivity, good selectivity, good stability and reproducibility.
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