Fluorescence Quenching of Dyes Covalently Attached to Single-Walled Carbon Nanotubes
Fluorescence Quenching of Dyes Covalently Attached to Single-Walled Carbon Nanotubes
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DOI：
10.1021/jp200152z
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发表时间：
2011-09-01
影响因子：
2.9
通讯作者：
Borguet, Eric
中科院分区：
文献类型：
--
作者：
Chiu, Cheuk Fai;Dementev, Nikolay;Borguet, Eric
发色团-碳纳米管杂合体的发展需要有效和准确的方法来研究其光物理性质。利用表面物种荧光标记（FLOSS）技术确定单壁碳纳米管（SWCNTs）表面共价附着染料密度的能力，用两种发色团：丹酰肼（DH）和全酰基溴（PB）定量研究了染料- SWCNTs杂合体的发光。与游离PB相比，PB- swcnts杂交体的荧光强度降低了20-80%。猝灭程度与SWCNTs样品中残留金属杂质含量呈正相关，说明PB-SWCNTs中PB的荧光猝灭可能是由金属杂质引起的，而不是由SWCNTs引起的。相反，与自由DH相比，DH-SWCNT杂交体的荧光强度降低了近2个数量级，与SWCNT样品中残余金属含量无关，这表明DH-SWCNT杂交体的荧光猝灭可能是通过从DH发色团到SWCNTs的电荷转移发生的，并揭示了DH-SWCNT杂交体在太阳能光收集应用方面的潜力。
The development of chromophore-carbon nanotube hybrids requires efficient and accurate methods to investigate their photophysical properties. Using the ability of the fluorescence labeling of surface species (FLOSS) technique to determine the density of covalently attached dyes to the surface of single-walled carbon nanotubes (SWCNTs), the luminescence of dye-SWCNT hybrids was quantitatively studied with two chromophores: dansyl hydrazine (DH) and panacyl bromide (PB). The fluorescence intensity of PB-SWCNT hybrids was reduced by 20-80% compared to that of free PB. A strong positive correlation between the degree of quenching and the residual metal impurity content in the SWCNT sample suggests that quenching of fluorescence of PB in PB-SWCNTs may be caused by the metal impurities and not by SWCNTs. On the contrary, the intensity of fluorescence of DH-SWCNT hybrids was reduced by almost 2 orders of magnitude compared to free DH, independent of the residual metal content in the SWCNT sample, suggesting that quenching of fluorescence in DH-SWCNT hybrids might occur via charge transfer from DH chromophores to SWCNTs, and revealing the potential of DH-SWCNT hybrids for solar light harvesting applications.