Flexible membranes of Ag-nanosheet grafted polyamide-nanofibers as effective 3D SERS substrates
Flexible membranes of Ag-nanosheet grafted polyamide-nanofibers as effective 3D SERS substrates
复制标题
银纳米片接枝聚酰胺纳米纤维的柔性膜作为有效的 3D SERS 基底。
DOI：
10.1039/c3nr06483b
复制
发表时间：
2014-01-01
期刊：
影响因子：
6.7
通讯作者：
Chen, Bin
中科院分区：
文献类型：
--
作者：
Qian, Yiwu;Meng, Guowen;Chen, Bin
我们报告了一种合成方法，通过静电纺丝 PA 纳米纤维膜、在 PA 纳米纤维上组装金纳米粒子作为随后生长银纳米片的种子以及在电纺丝上电沉积银纳米片的组合过程，生产由接枝有垂直银纳米片的聚酰胺（PA）纳米纤维组成的自支撑柔性表面增强拉曼散射（SERS）活性膜。 PA-纳米纤维。由于高密度的银纳米片在三维 (3D) 网络状 PA 纳米纤维膜中的每个 PA 纳米纤维周围垂直生长，因此相邻的银纳米片之间形成均匀的纳米级间隙，从而导致银纳米片接枝的 PA 纳米纤维膜内出现高密度的 3D SERS“热点”。银纳米片接枝 PA 纳米纤维膜表现出高 SERS 活性，整个膜上的罗丹明 6G 具有出色的拉曼信号再现性。为了对多氯联苯（PCB，一种全球环境危害）进行基于 SERS 的试验分析，3D SERS 基底膜采用单 6-β-环糊精进行修饰，以有效捕获 PCB 分子。结果，不仅达到了低至10(-6) M的低浓度，而且还鉴定出了混合溶液中PCBs的两种同系物，显示出基于SERS的快速检测环境中痕量有机污染物（例如PCBs）的广阔潜力。
We report on a synthetic approach to produce self-supported flexible surface-enhanced Raman scattering (SERS) active membranes consisting of polyamide (PA) nanofibers grafted with vertical Ag-nanosheets, via a combinatorial process of electrospinning PA-nanofiber membranes, assembling Au-nanoparticles on the PA-nanofibers as seeds for subsequent growth of Ag-nanosheets, and electrodepositing Ag-nanosheets on the electrospun PA-nanofibers. As a high density of Ag-nanosheets are vertically grown around each PA-nanofiber in the three-dimensional (3D) networked PA-nanofiber membranes, homogeneous nano-scaled gaps between the neighboring Ag-nanosheets are formed, leading to a high density of 3D SERS "hot spots" within the Ag-nanosheet-grafted PA-nanofiber membranes. The Ag-nanosheet-grafted PA-nanofiber membranes demonstrate high SERS activity with excellent Raman signal reproducibility for rhodamine 6G over the whole membrane. For a SERS-based trial analysis of polychlorinated biphenyls (PCBs, a kind of global environmental hazard), the 3D SERS substrate membranes are modified with mono-6-β-cychlodextrin to effectively capture PCB molecules. As a result, not only a low concentration down to 10(-6) M is reached, but also two congeners of PCBs in their mixed solution are identified, showing promising potential in SERS-based rapid detection of trace organic pollutants such as PCBs in the environment.