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arXiv 1104.2708cond-mat.mes-hall
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染料分子向掺杂石墨烯的激发能转移

Excitation energy transfer from dye molecules to doped graphene

R S Swathi, K L Sebastian

摘要:

最近,我们已经报道了关于从电子激发的分子到石墨烯的能量转移速率的理论研究(J. Chem. Phys. 129,054703,2008和J. Chem. Phys. 130,086101,2009)。发现石墨烯是电子激发态的非常有效的猝灭剂,并且$\propto $ $(distance)^{-4}$的速率。发现该过程在高达$30\;nm$时是有效的,这远远超出了传统的FRET极限。在这份报告中,我们研究了从染料分子到掺杂石墨烯的能量转移$\hbar Ω$。我们发现一个交叉的距离依赖性的速率从$(distance)^{-4}$指数的费米能级越来越多地转移到导带,与交叉发生在一个量$\hbar Ω/2$的费米能级的移位。

英文摘要:

Recently, we have reported theoretical studies (J. Chem. Phys. 129, 054703, 2008 and J. Chem. Phys. 130, 086101, 2009) on the rate of energy transfer from an electronically excited molecule to graphene. It was found that graphene is a very efficient quencher of the electronically excited states and that the rate $\propto $ $(distance)^{-4}$. The process was found to be effective up to $30\;nm$ which is well beyond the traditional FRET limit. In this report, we study the transfer of an amount of energy $\hbar Ω$ from a dye molecule to doped graphene. We find a crossover of the distance dependence of the rate from $(distance)^{-4}$ to exponential as the Fermi level is increasingly shifted into the conduction band, with the crossover occurring at a shift of the Fermi level by an amount $\hbar Ω/2$.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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