Abyaneh Majid Kazemian, Araki Tohru, Kaulich Burkhard
Diamond Light Source Ltd., Harwell Science and Innovation Campus, OX11 0DE Didcot, Oxfordshire, UK.
Nanomaterials (Basel). 2017 Oct 16;7(10):331. doi: 10.3390/nano7100331.
Gold nanorods (GNRs) have been fabricated by a novel polymer-immobilised seed mediated method using ultraviolet (UV) photoreduced gold-polymethylmethacrylate (Au-PMMA) nanocomposites as a seed platform and characterised at sub-micron scale regime with synchrotron-based techniques; near-edge X-ray absorption fine structure (NEXAFS) spectroscopy and X-ray fluorescence (XRF) mapping. In this report, it is shown that investigating polymer nanocomposites using combination of XRF mapping and NEXAFS spectromicroscopy can help to see the growth phenomenon from different perspective than conventional characterisation techniques. XRF maps are used to explore distribution of the constituent elements and showing how polymer matrix making stripe patterns along with regions where GNRs are formed. NEXAFS carbon (C) K-edge spectra have been taken at three different stages of synthesis: (1) on Au-PMMA nanocomposites before UV irradiation, (2) after gold nanoparticles formation, and (3) after GNRs formation. It reveals how polymer matrix has been degraded during GNRs formation and avoiding chemically or physically damage to polymer matrix is crucial to control the formation of GNRs.
金纳米棒（GNRs）已通过一种新型的聚合物固定种子介导方法制备而成，该方法使用紫外线（UV）光还原的金 - 聚甲基丙烯酸甲酯（Au - PMMA）纳米复合材料作为种子平台，并采用基于同步加速器的技术在亚微米尺度范围内进行表征；近边X射线吸收精细结构（NEXAFS）光谱和X射线荧光（XRF）映射。在本报告中，研究表明，与传统表征技术相比，结合XRF映射和NEXAFS光谱显微镜研究聚合物纳米复合材料有助于从不同角度观察生长现象。XRF映射用于探索组成元素的分布，并展示聚合物基质如何与形成GNRs的区域一起形成条纹图案。在合成的三个不同阶段采集了NEXAFS碳（C）K边光谱：（1）在紫外线照射前的Au - PMMA纳米复合材料上，（2）在金纳米颗粒形成后，以及（3）在GNRs形成后。它揭示了在GNRs形成过程中聚合物基质是如何降解的，并且避免对聚合物基质造成化学或物理损伤对于控制GNRs的形成至关重要。
