Department of Chemistry, Beijing Key Laboratory for Microanalytical Methods and Instrumentation, The Key Laboratory of Bioorganic Phosphorus Chemistry & Chemical Biology, Tsinghua University, Beijing 100084, China.
Spectrochim Acta A Mol Biomol Spectrosc. 2013 Dec;116:355-60. doi: 10.1016/j.saa.2013.07.057. Epub 2013 Aug 6.
A core-shell structure of plasmonic luminescent nanocomposite, Ni@SiO2@FITC@SiO2 (NSFS) combining the stable luminescence of fluorophore with the excellent plasmonic property of metal nanomaterials, has been synthesized through layer-by-layer assembly. The effect of NSFS on the ultraweak chemiluminescence (CL) reaction of hydrogen peroxide (H2O2) and sodium bisulfite (NaHSO3) was explored for the first time. It was found that the CL intensity from the decomposition of peroxomonosulfite was significantly enhanced by NSFS. The mechanism of the nanocomposite-enhanced CL was revealed as the coupling of chemically induced excited states of fluorescein isothiocyanate (FITC) with surface plasmons of Ni nanoparticles based on studies of CL emission spectra, electron spin resonance spectra, extinction spectra and fluorescence spectra. The work sheds new light on the characteristics of the versatile materials and gives us new insight into the optical properties of fluorophores.
一种等离子体发光纳米复合材料的核壳结构，Ni@SiO2@FITC@SiO2（NSFS），将荧光团的稳定发光与金属纳米材料的优异等离子体性质结合在一起，通过逐层组装合成。首次研究了 NSFS 对过氧化氢（H2O2）和亚硫酸氢钠（NaHSO3）的超微弱化学发光（CL）反应的影响。结果发现，过氧单硫酸盐的分解产生的 CL 强度显著增强。通过对 CL 发射光谱、电子顺磁共振光谱、消光谱和荧光光谱的研究，揭示了纳米复合材料增强 CL 的机制是荧光素异硫氰酸酯（FITC）的化学诱导激发态与 Ni 纳米粒子表面等离子体的耦合。这项工作为多功能材料的特性提供了新的认识，并为荧光团的光学性质提供了新的见解。
