期刊
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
卷 10, 期 7, 页码 1542-1549出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpclett.9b00373
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资金
- Fundacao para a Ciencia e a Tecnologia, FCT [REEQ/115/QUI/2005, PTDC/CTM-NAN/2700/2012, PTDC/QEQ-QIN/3007/2014]
- FCT/MCTES [UID/QUI/50006/2019, UID/BIO/04565/2019, UID/QUI/00100/2019]
- BIOTECnico Program [PD/BD/113630/2015]
- FCT [SFRH/BPD/111906/2015]
- Fundação para a Ciência e a Tecnologia [PTDC/QEQ-QIN/3007/2014, PD/BD/113630/2015, PTDC/CTM-NAN/2700/2012] Funding Source: FCT
Porphyrins are typically weak emitters, which presents challenges to their optical detection by single-molecule fluorescence microscopy. In this contribution, we explore the enhancement effect of gold nanodimer antennas on the fluorescence of porphyrins in order to enable their single-molecule optical detection. Four meso-substituted free-base porphyrins were evaluated: two cationic, one neutral, and one anionic porphyrin. The gold nanodimer antennas are able to enhance the emission from these porphyrins by a factor of 10(5) -10(6) increase in the maximum detected photon rates. This extreme enhancement is due to the combination of an antenna effect on the excitation rate that is estimated to be above 10(4) -fold and an emission efficiency that corresponds to an increase of 2-10 times in the porphyrin's fluorescence quantum yield.
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