Supporting Information

Transcription

1 Supporting Information Electrochemiluminescent Pb 2+ -Driven Circular Etching Sensor Coupled to a DNA Micronet-Carrier Wen-Bin Liang,, Ying Zhuo, Ying-Ning Zheng, Cheng-Yi Xiong, Ya-Qin Chai, *, and Ruo Yuan *, Key Laboratory of Luminescent and Real-Time Analytical Chemistry (Southwest University), Ministry of Education, College of Chemistry and Chemical Engineering, Southwest University, Chongqing , PR China Department of Clinical Biochemistry, Laboratory Sciences, Southwest Hospital, Third Military Medical University, 30 Gaotanyan Street, Shapingba District, Chongqing , PR China * Corresponding Author yqchai@swu.edu.cn (Yaqin Chai), yuanruo@swu.edu.cn (Ruo Yuan). Tel.: ; Fax: S-1

2 Scheme S1 Schematic illustration for the mechanism of the ECL reactions on the proposed biosensor surface. Figure S1 The schematic diagram of the equivalent circuit with model impedance data. S-2

3 Figure S2 Polyacrylamide gel electrophoresis characterization of the generation of DNA micronet-carrier. Figure S3 The ECL performance (blue line) associated with electrochemical (red line) response of the proposed biosensor. S-3

4 Figure S4 The characterization of ECL biosensor with different layers. S-4

5 Figure S5 The investigation of the repeatability of the proposed ECL biosensor via intra- and inter-assay. A, the investigation of the repeatability via intra-assay by 15 different ECL biosensors without reaction of Pb 2+ ; B, the investigation of the repeatability via inter-assay by 15 different ECL biosensors without reaction of Pb 2+ ; C, the investigation of the repeatability via intra-assay by 15 different ECL biosensors with reaction of 400 nm Pb 2+ ; D, the investigation of the repeatability via inter-assay by 15 different ECL biosensors with reaction of 400 nm Pb 2+. S-5

6 Figure S6 The concentration range for the concentration of Pb 2+ in the applicability evaluation by the standard addition method (A) and comparison with the inductively coupled plasma mass spectrometry (B) in a box chart (box, 25% 75% value range;, mean value;, 1% to 99% percentile; ICP, inductively coupled plasma mass spectrometry). S-6

7 Table S1 Comparison of the developed ECL strategy with other methods from the literature. Methods Linear Range Detection Limit Ref. ECL nm 70 nm Ref. S1 ECL nm 0.35 pm Ref. S2 EC nm 300 nm Ref. S3 EC nm 34 pm Ref. S4 EC nm 21 nm Ref. S5 FL nm 5 nm Ref. S6 FL 1 pm-3 µm 0.3 pm Ref. S7 SERS 10 pm-1 µm 8.9 pm Ref. S8 ICPMS µg/l 3 ng/l Ref. S9 ECL 50 pm-500 µm 4.73 pm This work Abbreviations: EC, electrochemistry; ECL, electrochemiluminescence; FL, fluorescence; ICPMS, inductively coupled plasma mass spectrometry; SERS, surface enhanced Raman scattering. S-7

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