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首页> 外文学位 >Fabrication of novel gold nanorod/polymer nanocomposite fibers and their application in heavy metal ion sensing.
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Fabrication of novel gold nanorod/polymer nanocomposite fibers and their application in heavy metal ion sensing.

机译：新型金纳米棒/聚合物纳米复合纤维的制备及其在重金属离子传感中的应用。

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摘要

Metallic nanoparticles (MNPs), which exhibit fascinating optical, electronic and catalytic properties, have been recognized as essential building blocks for the development of advanced nanodevices. Production of MNP assemblies on a pre-designed substrate is a crucial step towards the exploration of their ensemble properties as well as their potential applications. Despite the diverse assembly strategies reported in the literature, the lack of a generic MNP immobilization strategy with applicability to MNPs and substrates with various shapes and chemical compositions remains an unsolved problem.;To this end, we proposed an electrostatic attraction-driven assembly strategy and applied it to the fabrication of a novel nanocomposite material composed of gold nanorod (AuNR) assemblies supported on electrospun polycaprolactone (PCL) fibers. In order to utilize electrostatic attraction as the driving force, opposite surface charges on the AuNRs and the PCL fibrous substrate were developed via polyelectrolyte decoration. UV-Vis studies on the AuNR immobilization process revealed that the AuNR density on the fiber surface can be effectively tuned by changing the immersion time.;The as-fabricated AuNR/PCL nanocomposite fibers were further employed as substrates for surface enhanced Raman scattering (SERS) measurements and they exhibited high activity as well as excellent reproducibility for both chemisorbed and physisorbed analyte molecules. In addition, a comparison experiment on the SERS performance of the 3D AuNR/PCL fibrous substrate and its 2D counterpart---a AuNR/PCL film, demonstrated that the former provided superior SERS activity due to the enhanced surface area.;With the demonstration on the high SERS efficacy, we moved one step further towards the development of a SERS-based environmental sensor targeting the detection of highly toxic heavy metal ions of Hg2+ and Cu 2+.;The SERS detection of Hg2+ and Cu2+ was achieved through the functionalization of AuNR/PCL fibers with metal ion binding ligands of 2,5-dimercapto-1,3,4-thiadiazole dimer and trimercaptotriazine, respectively. The changes in the SERS spectral features of the ligands before and after heavy metal ion coordination were indicative for the detection of target ions. Based on the above design, the resultant sensors exhibited not only high selectivity, but also the capability for quantitative analysis of the target ion concentration.
机译：具有令人着迷的光学，电子和催化性能的金属纳米颗粒（MNP）已被公认为是开发先进纳米器件的重要组成部分。在预先设计的基板上生产MNP组件是探索其整体性能及其潜在应用的关键一步。尽管文献中报道了多种组装策略，但缺乏适用于具有各种形状和化学组成的MNP和底物的通用MNP固定策略仍然是一个尚未解决的问题。为此，我们提出了静电吸引驱动的组装策略和将其应用于新型纳米复合材料的制造，该复合材料由负载在电纺聚己内酯（PCL）纤维上的金纳米棒（AuNR）组件组成。为了利用静电引力作为驱动力，通过聚电解质装饰在AuNRs和PCL纤维基材上形成了相反的表面电荷。对AuNR固定过程的UV-Vis研究表明，通过改变浸没时间可以有效地调节纤维表面上的AuNR密度。;将制成的AuNR / PCL纳米复合纤维进一步用作表面增强拉曼散射（SERS）的基质）测量，它们对化学吸附和物理吸附的分析物分子均表现出高活性以及出色的重现性。此外，通过对3D AuNR / PCL纤维基质及其2D对应物-AuNR / PCL膜的SERS性能进行对比实验，结果表明，前者由于表面积增加而具有优越的SERS活性。在高SERS功效方面，我们朝着基于SERS的环境传感器的开发又迈进了一步，该传感器旨在检测Hg2 +和Cu 2+的高毒性重金属离子。;通过功能化实现了Hg2 +和Cu2 +的SERS检测分别具有2,5-二巯基-1,3,4-噻二唑二聚体和三巯基三嗪的金属离子结合配体的AuNR / PCL纤维。重金属离子配位之前和之后配体的SERS光谱特征的变化指示了目标离子的检测。基于上述设计，所得传感器不仅显示出高选择性，而且还具有定量分析目标离子浓度的能力。

著录项

  • 作者

    Tang, Wenqiong.;

  • 作者单位

    University of Delaware.;

  • 授予单位 University of Delaware.;
  • 学科 Materials science.;Nanotechnology.
  • 学位 Ph.D.
  • 年度 2014
  • 页码 165 p.
  • 总页数 165
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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