Confinement Effect in Layered Double Hydroxide Nanoreactor: Improved Optical Sensing Selectivity

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• 作者：Liqing Song ; Wenying Shi ; Chao Lu
• 刊名：Analytical Chemistry
• 出版年：2016
• 出版时间：August 16, 2016
• 年：2016
• 卷：88
• 期：16
• 页码：8188-8193
• 全文大小：385K
• 年卷期：0
• ISSN：1520-6882

文摘

Confinement effect in the layered double hydroxide (LDH) nanoreactors can control the reaction rate and disperse the fluorescence guest, which are promising to be introduced in optical sensing systems. In this work, an optical sensor has been fabricated by combining the confinement effect from the LDH nanoreactors with advantageous sensing performances of graphene quantum dots (GQDs). The mechanism indicated the LDHs with two dimensional (2D) confined space provided a stable microenvironment and acted as the disperse matrix to control the distribution of intercalated GQDs. Such a confinement effect may decrease the diffusion rate of hydroxyl radicals (^•OH), and thus ^•OH with the short lifetime (10^–9 s) is annihilated during the diffusing process into the LDH interlayer galleries. As a result, the inherently existing interference from ^•OH for detection of NO₂ was eliminated. Furthermore, a rapid and portable fluorescent paper sensor coated with the as-prepared GQD-LDHs for visual detection of NO₂ gas was successfully developed. Our work provides a feasible method to remarkably improve the selectivity by virtue of confinement effect.