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Method for preparing nanohybrid used for ratiometric fluorescence and ratiometric electrochemical sensing simultaneously
Method for preparing nanohybrid used for ratiometric fluorescence and ratiometric electrochemical sensing simultaneously
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机译:用于制备用于同时测量荧光和比例电化学感测的纳米冬次的方法
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摘要
A method for preparing a nanohybrid used for ratiometric fluorescence and ratiometric electrochemical sensing simultaneously is provided. Surface-aminated (—NH2) SiO2 nanospheres encapsulating an electroactive material A or B are prepared and conjugated with surface-carboxylated (—COOH) carbon dots (CDs) or gold nanoclusters (AuNCs) to prepare a conjugate, and the conjugate is conjugated with a DNA aptamer terminated with —NH2. Ions or biomolecules are added to two types of DNA-conjugate dispersions, and ratiometric florescence sensing is realized by fitting the linear relationship between ratiometric fluorescent peak intensity ICDs/IAuNCs and a specific ion concentration or a specific biomolecule concentration. A-SiO2@CDs-DNA is attached to the surface of a gold electrode based on a DNA terminal —SH and Au—S bonding; B—SiO2@AuNCs-DNA and ions or biomolecules are added, and ratiometric electrochemical sensing is realized by fitting the linear relationship between the specific ion concentration or the specific biomolecule concentration and the ratiometric current peak intensity IB/IA.
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机译:提供了一种用于同时使用用于比例荧光和比例电化学感测的纳米冬次的方法。用表面胺化(-NH 2 sub>)SiO 2 sub>纳米球,其与表面 - 羧化(-COOH)碳点(CD)或缀合用于制备缀合物的金纳细胞(auncs),缀合物与终止于-NH 2 / sub>终止的DNA适体缀合。将离子或生物分子添加到两种类型的DNA - 缀合物分散体中,并且通过拟合比率荧光峰强度I Cds sub> / i auncts sub>的线性关系来实现大率荧光感测。特定的离子浓度或特定的生物分子浓度。基于DNA端子-SH和AU-S粘合,A-SiO 2 sub> @ Cds-DNA连接到金电极的表面;添加B-SiO 2 sub> @ auncs-dna和离子或生物分子,并且通过拟合特定离子浓度或特定生物分子浓度与比率电流峰强度I之间的线性关系来实现具体测量电化学感测。 b sub> / i a sub>。
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