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. 2016 Feb 26;6:22234. doi: 10.1038/srep22234

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(A) Cyclic voltammograms (a) and ECL–potential curve (b) of Ru-SiO₂@PEI/GCE in 0.1 M PBS (pH 7.5). (B) ECL response of (a) Ru-SiO₂/GCE, (b) Ru-SiO₂@PEI/GCE in 0.1 M PBS (pH 7.5) and (c) Ru-SiO₂/GCE in 0.1 M PBS (pH 7.5) containing of 20 mg mL⁻¹ PEI. Scan rate: 100 mV s⁻¹. Scan potential: 0~1.35 V.