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Engineering of Heterojunction-Mediated Biointerface for Photoelectrochemical Aptasensing: Case of Direct Z-Scheme CdTe-Bi2S3 Heterojunction with Improved Visible-Light-Driven Photoelectrical Conversion Efficiency
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2017-05-12 00:00:00 , DOI: 10.1021/acsami.7b04310
Qian Liu 1 , Juan Huan 2 , Nan Hao 2 , Jing Qian 2 , Hanping Mao 1 , Kun Wang 2
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2017-05-12 00:00:00 , DOI: 10.1021/acsami.7b04310
Qian Liu 1 , Juan Huan 2 , Nan Hao 2 , Jing Qian 2 , Hanping Mao 1 , Kun Wang 2
Affiliation
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This work presents a heterojunction-mediated photoelectrochemical (PEC) biointerface for selective detection of microcystin-LR (MC-LR) by introducing a direct Z-scheme heterojunction as efficient visible-light-driven photoactive species. Specifically, the Z-scheme type CdTe-Bi2S3 heterojunction was designed and synthesized as an ideal photoactive material, which exhibited higher PEC activity as compared with either CdTe quantum dots or Bi2S3 nanorods due to the improved photogenerated charges separation efficiency of heterojunction. Then the MC-LR aptamer was employed for selective recognition of MC-LR target, which was immobilized on the CdTe-Bi2S3 film by the formation of phosphor-amidate bonds between the phosphate group of aptamer and amino group of the chitosan film on the electrode. The proposed aptasensor showed a photocurrent signal due to the photoactive CdTe-Bi2S3 heterojunction, while the presence of MC-LR resulted in a dose-responsive decrease in PEC response, which allowed the quantification analysis of MC-LR by measuring the photocurrent signal of the fabricated aptasensor. Under optimal conditions, the resulted PEC aptasensor showed wide linear range (0.01–100 pM) and low detection limit (0.005 pM) for MC-LR determination with high selectivity and acceptable reproducibility. Finally, the proposed aptasensing method was successfully applied in MC-LR detection in real water samples.
中文翻译：
光化学吸收的异质结介导的生物界面工程：具有改进的可见光驱动光电转换效率的直接Z方案CdTe-Bi 2 S 3异质结的案例
这项工作通过引入直接的Z方案异质结作为有效的可见光驱动的光敏物质，提出了一种异质结介导的光电化学（PEC）生物界面，用于选择性检测微囊藻毒素-LR（MC-LR）。具体地说，设计并合成了Z型CdTe-Bi 2 S 3异质结作为理想的光敏材料，由于提高了光生电荷的分离效率，与CdTe量子点或Bi 2 S 3纳米棒相比，PEC活性更高。异质结。然后将MC-LR适体用于选择性识别固定在CdTe-Bi 2 S 3上的MC-LR靶标通过在适体的磷酸根和电极上的脱乙酰壳多糖膜的氨基之间形成磷-氨基甲酸酯键来形成膜。拟议的适体传感器由于光敏的CdTe-Bi 2 S 3异质结而显示出光电流信号，而MC-LR的存在导致PEC反应的剂量响应性降低，从而可以通过测量光电流对MC-LR进行定量分析制成的适体传感器的信号。在最佳条件下，所得的PEC适体传感器显示出宽的线性范围（0.01–100 pM）和低的检测限（0.005 pM），用于MC-LR测定，具有高选择性和可接受的重现性。最后，所提出的适体检测方法已成功地应用于实际水样的MC-LR检测中。
更新日期：2017-05-18
中文翻译：
光化学吸收的异质结介导的生物界面工程：具有改进的可见光驱动光电转换效率的直接Z方案CdTe-Bi 2 S 3异质结的案例
这项工作通过引入直接的Z方案异质结作为有效的可见光驱动的光敏物质，提出了一种异质结介导的光电化学（PEC）生物界面，用于选择性检测微囊藻毒素-LR（MC-LR）。具体地说，设计并合成了Z型CdTe-Bi 2 S 3异质结作为理想的光敏材料，由于提高了光生电荷的分离效率，与CdTe量子点或Bi 2 S 3纳米棒相比，PEC活性更高。异质结。然后将MC-LR适体用于选择性识别固定在CdTe-Bi 2 S 3上的MC-LR靶标通过在适体的磷酸根和电极上的脱乙酰壳多糖膜的氨基之间形成磷-氨基甲酸酯键来形成膜。拟议的适体传感器由于光敏的CdTe-Bi 2 S 3异质结而显示出光电流信号，而MC-LR的存在导致PEC反应的剂量响应性降低，从而可以通过测量光电流对MC-LR进行定量分析制成的适体传感器的信号。在最佳条件下，所得的PEC适体传感器显示出宽的线性范围（0.01–100 pM）和低的检测限（0.005 pM），用于MC-LR测定，具有高选择性和可接受的重现性。最后，所提出的适体检测方法已成功地应用于实际水样的MC-LR检测中。
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