Swathi R S, Sebastian K L
Department of Inorganic and Physical Chemistry, Indian Institute of Science, Bangalore 560012, India.
J Chem Phys. 2009 Feb 28;130(8):086101. doi: 10.1063/1.3077292.
In our previous report on resonance energy transfer from a dye molecule to graphene [J. Chem. Phys.129, 054703 (2008)], we had derived an expression for the rate of energy transfer from a dye to graphene. An integral in the expression for the rate was evaluated approximately. We found a Yuwaka-type dependence of the rate on the distance. We now present an exact evaluation of the integral involved, leading to very interesting results. For short distances (z<20 A), the present rate and the previous rate are in good agreement. For larger distances, the rate is found to have a z(-4) dependence on the distance, exactly. Thus we predict that for the case of pyrene on graphene, it is possible to observe fluorescence quenching up to a distance of 300 A. This is in sharp contrast to the traditional fluorescence resonance energy transfer where the quenching is observable only up to 100 A.
在我们之前关于从染料分子到石墨烯的共振能量转移的报告[《化学物理杂志》129, 054703 (2008)]中，我们推导出了从染料到石墨烯的能量转移速率的表达式。该速率表达式中的一个积分进行了近似求值。我们发现速率对距离呈现出Yuwaka型依赖关系。我们现在给出所涉及积分的精确求值，得到了非常有趣的结果。对于短距离（z < 20 Å），当前速率与之前的速率吻合良好。对于更大的距离，发现速率对距离呈现出z⁻⁴依赖关系，确切如此。因此我们预测，对于芘在石墨烯上的情况，有可能观察到高达300 Å距离的荧光猝灭。这与传统的荧光共振能量转移形成鲜明对比，在传统的荧光共振能量转移中，猝灭仅在高达100 Å的距离内可观察到。
