pH Independent Nano-Optode Sensors Based on Exhaustive Ion-Selective Nanospheres

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• 作者：Xiaojiang Xie ; Jingying Zhai ; Eric Bakker
• 刊名：Analytical Chemistry
• 出版年：2014
• 出版时间：March 18, 2014
• 年：2014
• 卷：86
• 期：6
• 页码：2853-2856
• 全文大小：260K
• 年卷期：v.86,no.6(March 18, 2014)
• ISSN：1520-6882

文摘

Bulk optode-based ion selective optical sensors work on the basis of extraction equilibria, and their response toward the analyte ion is known to dependent on the sample pH. This pH dependence has been one of the major disadvantages that have hampered the broad acceptance of bulk optodes in chemical sensing. We present here for the first time the use of exhaustive Ca²⁺-selective nanosensors that may overcome this pH dependent response. The nanosensors were characterized at different pH and the same linear calibration was obtained in the Ca²⁺ concentration range from 10^鈥? M to 10^鈥? M.