Efficient electron transfer in carbon nanodot–graphene oxide nanocomposites
Efficient electron transfer in carbon nanodot–graphene oxide nanocomposites
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DOI：
10.1039/c3tc32395a
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发表时间：
2014-03
影响因子：
6.4
通讯作者：
Pyng Yu;X. Wen;Yon‐Rui Toh;Yu-Chieh Lee;Kuo-Yen Huang;Shujuan Huang;S. Shrestha;G. Conibeer;Jau Tang
中科院分区：
文献类型：
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作者：
Pyng Yu;X. Wen;Yon‐Rui Toh;Yu-Chieh Lee;Kuo-Yen Huang;Shujuan Huang;S. Shrestha;G. Conibeer;Jau Tang
碳纳米点（CND）具有优异的电学和光学性能，在光电子学和电子学领域具有广阔的应用前景。在本文中，我们调查的CNDs-氧化石墨烯（GO），-多壁碳纳米管（MWNTs）和-TiO 2纳米粒子的纳米复合材料中的电子转移没有链接分子，使用稳态和时间分辨光谱。在CND-GO体系中观察到显著的荧光猝灭，这归因于从CNDs到GO的超快电子转移，时间常数为400 fs。相比之下，碳纳米管导致CND中荧光的静态猝灭。在CND-MWNT和CND-TiO 2纳米复合材料中没有观察到电荷转移。这一发现表明，CND-GO纳米复合材料由于有效的载流子提取、宽光谱吸收、弱的电子-声子散射以及因此对热载流子的缓慢冷却速率而可以是热载流子太阳能电池的优异候选物。
Carbon nanodots (CNDs) have emerged as fascinating materials with exceptional electronic and optical properties, and thus they offer many promising applications in photovoltaics and photocatalysis. In this paper we investigate electron transfer in nanocomposites of CNDs–graphene oxide (GO), –multi-walled carbon nanotubes (MWNTs) and –TiO2 nanoparticles without linker molecules, using steady state and time-resolved spectroscopy. Significant fluorescence quenching was observed in the CND–GO system, and it is attributed to the ultrafast electron transfer from CNDs to GO with a time constant of 400 fs. In comparison, carbon nanotubes result in static quenching of fluorescence in CNDs. No charge transfer was observed in both CND–MWNT and CND–TiO2 nanocomposites. This finding suggests that the CND–GO nanocomposite can be an excellent candidate for hot carrier solar cells due to the effective carrier extraction, broad spectral absorption, weak electron–phonon scattering, and thus a slow cooling rate for hot carriers.