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Glutathione influence on the photoluminescence from semiconducting single-walled carbon nanotubes compared with other thiol compounds
Chemical Physics ( IF 2.3 ) Pub Date : 2018-07-09 , DOI: 10.1016/j.chemphys.2018.07.004
N.V. Kurnosov , V.S. Leontiev , V.A. Karachevtsev

The influence of antioxidant glutathione (GSH) on the photoluminescence (PL) from the semiconducting single-walled carbon nanotubes (SWNTs) suspended with DNA in water has been studied in this research. The strong PL enhancement was found after GSH doping (10-6–10-4 M) of the nanotube suspension, which is explained by passivation of the emission-quenching defects on the nanotube sidewall by the reactive thiol group in the GSH structure. The PL increase depends on the sonication treatment of the nanotube suspension, the quantity of this increase also differs in the emission bands specified by the disordered biopolymer coverage of corresponding nanotubes. This observation allows the ratiometric PL detection of glutathione. The nanotube PL is less sensitive to GSH impact as compared to cysteine. Experiments with other thiol-containing compounds as dithiothreitol and dithioerythritol showed a tendency that the compound with lower redox potential causes a stronger increase of the PL from suspended SWNTs.



中文翻译:

与其他硫醇化合物相比,谷胱甘肽对半导体单壁碳纳米管的光致发光的影响

本研究研究了抗氧化剂谷胱甘肽(GSH)对悬浮于DNA中的半导体单壁碳纳米管(SWNTs)的光致发光(PL)的影响。GSH掺杂后发现PL增强很强(10 -6 –10 -4M)的纳米管悬浮液,这可以通过GSH结构中的反应性巯基钝化纳米管侧壁上的发射猝灭缺陷来解释。PL的增加取决于纳米管悬浮液的超声处理,这种增加的数量在相应的纳米管的无序生物聚合物覆盖范围所指定的发射谱带中也有所不同。该观察结果允许对谷胱甘肽进行比例式PL检测。与半胱氨酸相比,纳米管PL对GSH的影响较不敏感。使用其他含硫醇的化合物(如二硫苏糖醇和二硫赤藓糖醇)进行的实验表明,具有较低氧化还原电位的化合物会导致悬浮的SWNT的PL升高更大。

更新日期:2018-07-10
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