Visualizing Gaseous Nitrogen Dioxide by Ratiometric Fluorescence of Carbon Nanodots鈥換uantum Dots Hybrid

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• 作者：Yehan Yan ; Jian Sun ; Kui Zhang ; Houjuan Zhu ; Huan Yu ; Mingtai Sun ; Dejian Huang ; Suhua Wang
• 刊名：Analytical Chemistry
• 出版年：2015
• 出版时间：February 17, 2015
• 年：2015
• 卷：87
• 期：4
• 页码：2087-2093
• 全文大小：471K
• ISSN：1520-6882

文摘

A novel nanohybrid ratiometric fluorescence probe for on-site and visual determination of nitrogen dioxide (NO₂) has been designed. The hybrid probe comprises blue-colored fluorescence carbon nanodots (CDs) and red-colored emission CdTe quantum dots (QDs). Such hybridized probe exhibits dual emission bands centered at 460 and 665 nm, respectively. The blue fluorescence of CDs is insensitive to the analyte, whereas the red emission of QDs is specifically quenched by the analyte, resulting in a distinguishable color change from orange-red to blue upon exposure to NO₂. The limit of detection for nitrogen dioxide is estimated to be 19 nM in aqueous solution. More importantly, the nanohybrid probe has been successfully applied in visual detection of gaseous NO₂ with a detection limit of 1 ppm, suggesting its potential application for NO₂ sensing.