PDMS-Au复合基底上多环芳烃分子的表面增强拉曼光谱

发布时间：2018-05-19 07:39

  本文选题：表面增强拉曼光谱 + 复合基底　； 参考：《高等学校化学学报》2017年03期

【摘要】：利用聚二甲基硅氧烷(PDMS)对有机物的富集功能,通过在金纳米粒子单层膜(Au MLF)表面旋涂薄层PDMS膜制备PDMS-Au MLF复合表面增强拉曼光谱(SERS)基底.研究了SERS增强性能与旋涂液浓度及稀释溶剂间的关系,考察了复合基底增强活性的均匀性.研究发现,采用叔丁醇为稀释溶剂,浓度为2%(质量分数)的旋涂液时所得复合基底表面多环芳烃(PAHs)的SERS信号强度最高,且此基底SERS信号强度偏差小于10%.分别以PDMS-Au MLF复合材料和Au MLF作为基底,对比研究了对萘、蒽、菲和芘4种多环芳烃的SERS检测能力.结果表明,PDMS-Au MLF复合基底对以上4种有机物的检出限分别为10~(-6),10~(-7),10~(-8)及10~(-7)mol/L,相比于单一Au MLF基底,其检测限至少降低了1个数量级,这主要源自于PDMS对PAHs的富集作用,且此类复合基底可用于多种多环芳烃混合物的特征识别.
[Abstract]:The enrichment function of polydimethylsiloxane (PDMS) on organic compounds was used to prepare PDMS-Au MLF composite surface-enhanced Raman spectroscopy (SERS) substrates by spin-coating thin PDMS films on au MLF monolayers of gold nanoparticles. The relationship between SERS reinforcement and the concentration of spin-coating solution and dilute solvent was studied, and the homogeneity of the reinforcing activity of the composite substrate was investigated. It is found that the SERS signal intensity of the composite substrate surface is the highest when tert-butanol is used as the dilution solvent and the concentration is 2% (mass fraction), and the deviation of the SERS signal intensity of the substrate is less than 10%. The SERS detection ability of naphthalene, anthracene, phenanthrene and pyrene polycyclic aromatic hydrocarbons (PAHs) was studied by using PDMS-Au MLF composites and au MLF as substrates, respectively. The results showed that the detection limits of the above four organic compounds on the PDMS-Au MLF composite substrate were 10 ~ 10 ~ (-6) ~ 10 ~ (-1) and 10 ~ 10 ~ (-7) mol / L, respectively. Compared with a single au MLF substrate, the detection limit was reduced by at least one order of magnitude, which was mainly due to the enrichment of PAHs by PDMS. The composite substrates can be used to identify the characteristics of polycyclic aromatic hydrocarbons (PAHs) mixtures.
【作者单位】： 苏州大学材料与化学化工学部;
【分类号】：O657;;O646
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本文编号：1909265