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首页> 外文期刊>Nanotechnology >Comparative study of photoluminescence of single-walled carbon nanotubes wrapped with sodium dodecyl sulfate, surfactin and polyvinylpyrrolidone
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Comparative study of photoluminescence of single-walled carbon nanotubes wrapped with sodium dodecyl sulfate, surfactin and polyvinylpyrrolidone

机译：十二烷基硫酸钠，表面活性素和聚乙烯吡咯烷酮包裹的单壁碳纳米管的光致发光比较研究

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摘要

Single-walled carbon nanotubes (SWCNTs) have been dispersed with three types of amphiphilic materials in aqueous solutions: (i) an anionic aliphatic surfactant, sodium dodecyl sulfate (SDS), (ii) a cyclic lipopeptide biosurfactant, surfactin, and (iii) a water-soluble polymer, polyvinylpyrrolidone (PVP). Solution photoluminescence (PL) studies suggest that SDS wrapping is very sensitive to the temperature whereas the other two give relatively robust wrapping around the SWCNTs. Low temperature PL spectra from both surfactin and PVP dispersed SWCNTs show that peak shifts are strongly dependent on their chiralities, which can be explained by the bandgap modulations with the environmental strain. The uniaxial and torsional strains deduced from their bandgap shifts were similar, indicating the strains are mainly due to the different rates of thermal expansion in SWCNTs and ice.
机译：单壁碳纳米管（SWCNT）已与三种类型的两亲材料分散在水溶液中：（i）阴离子脂族表面活性剂，十二烷基硫酸钠（SDS），（ii）环状脂肽生物表面活性剂，表面活性剂和（iii）水溶性聚合物聚乙烯吡咯烷酮（PVP）。溶液光致发光（PL）研究表明，SDS包裹对温度非常敏感，而其他两个包裹在SWCNT周围的包裹则相对牢固。表面活性素和PVP分散的SWCNT的低温PL光谱表明，峰位移强烈依赖于它们的手性，这可以通过环境应变的带隙调制来解释。由带隙位移推导的单轴和扭转应变是相似的，表明该应变主要是由于SWCNT和冰中热膨胀率不同所致。

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