研究了金纳米粒子对染料罗丹明6G(R6G)和荧光素(FL)光学性质的影响.表面有柠檬酸根保护层的金纳米粒子吸附带正电荷的罗丹明6G后,其表面等离子体共振红移;但吸附带负电荷的荧光素后,其表面等离子体共振几乎不受影响,这可能与粒子之间的静电作用有关.罗丹明6G的表面增强拉曼光谱表明其平躺吸附在金纳米粒子表面,非辐射能量转移的发生和不利的吸附取向导致罗丹明6G荧光信号强度减弱,相反,荧光素由于与金纳米粒子表层柠檬酸根之间有静电排斥作用,产生了一段距离,使得荧光信号增强.
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