纳米粘土锂皂石和pH对荧光染料间能量传递的影响
Effect of nanoclay laponite and pH on the energy transfer between fluorescent dyes
摘要：
研究了两种染料吖啶黄（Acf）和罗丹明B（RhB）在溶液和层状自组装膜（LbL）中的荧光共振能量转移（FRET）现象。紫外-可见吸收和荧光光谱研究表明，这两种染料主要存在于溶液和薄膜中的单体。在溶液和LbL膜中，Acf与RhB之间发生了能量转移。粘土锂皂石的存在提高了能量传递效率，在粘土分散体和LbL膜中的最大效率分别为78.17%和32.54%。锂皂石颗粒的存在下，LBL膜证实了原子力显微镜调查的表面覆盖率超过75%。能量转移效率是pH敏感的，并且在混合染料溶液中，对于pH从3.0到12.0的变化，能量转移效率从4.5%变化到44.45%。通过适当的校准，有可能使用所研究的本系统来感测从3.0到12.0的宽pH范围内的pH。
英文摘要：
Fluorescence resonance energy transfer (FRET) between two dyes acriflavine (Acf) and rhodamine B (RhB) were investigated in solution and Layer-by-Layer (LbL) self assembled films in presence and absence of clay mineral laponite. UV-Vis absorption and fluorescence spectroscopy studies suggest both the dyes present mainly as monomer in solution and films. Energy transfer occurred from Acf to RhB in solution and LbL films. The energy transfer efficiency increases in presence of clay laponite and the maximum efficiency were 78.17% and 32.54% in clay dispersion and in LbL films respectively. Presence of laponite particles onto LbL film was confirmed by atomic force microscopy investigations with a surface coverage of more than 75%. Energy transfer efficiency was pH sensitive and the energy transfer efficiency varies from 4.5% to 44.45% in mixed dye solution for a change in pH from 3.0 to 12.0. With proper calibration it is possible to use the present system under investigation to sense pH over a wide range of pH from 3.0 to 12.0.
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