Dual-Mode High-Sensitive Detection of Fe(III) Ions via Fluorescent Photonic Crystal Films Based on Co-Assembly of Silica Colloids and Carbon Dots

作者：Dai, Guangchao; Wang, Jianying^*; Zhao, Yangying; Zhu, Yuhua; Ma, Xiaofei; Mei, Tao; Li, Jinhua^*; Ma, Pengchang; Wang, Xianbao^*

来源：Science of Advanced Materials, 2017, 9(6): 873-880.

DOI：10.1166/sam.2017.3069

• Photonic Crystal
• SiO2 Colloids
• Carbon Dots
• Fluorescence
• Metal Ion Detection

Fluorescent photonic crystal (FPC) films are generated through co-assembly of monodispersed silica colloids and carbon dots (CDs). Monodisperse silica colloids are first synthesized by the Stober method, then are mixed with CDs solution, which are further assembled into FPC films with opal structure via a vertical deposition method. The surface groups and microstructures of CDs, silica colloids, and FPC films have been analysed by using XPS, TEM and SEM. The optical and fluorescent properties of FPC films have been measured by using a fiber optic spectrometer and fluorescence spectrometer. The FPC films exhibit brilliant structural colors and good fluorescence property, e.g., solid-state photoluminescence on glass substrate, simultaneously, realizing multi-functions (e.g., photonic bandgap, structural color and fluorescence) in one material. Moreover, the FPC film can be used as a metal ion sensor for highly sensitive detection of Fe(III) ions via dual detection mode, namely, reflection and fluorescence mode. Based on this dual-mode detection, broadly varying concentrations (from 0.1 nM to 100 mu M) of Fe(III) ions could be precisely confirmed. The FPC films not only appear low detection of limit (DOL), but show good selectivity for Fe(III) ions.

• 出版日期2017-6
• 单位湖北大学