Materials and synchrotron radiation

材料和同步辐射

• 批准号: RGPIN-2014-04113
• 负责人: Sham, Tsun
• 金额: $ 4.95万
• 依托单位: University of Western Ontario
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2015
• 资助国家: 加拿大
• 起止时间: 2015-01-01 至 2016-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=587610
• 关键词: Materials; synchrotron; radiation

We propose to conduct research in two intimately related fronts: (1) functional nanomaterials, fundamental properties and applications in energy, environment, drug delivery and metal- biomaterial interface and (2) development and application of synchrotron based advanced photon techniques, especially high energy resolution electron spectroscopy, high energy resolution X-ray (absorption and emission) spectroscopy, and microscopy in tracking the electronic behaviour of functional nanomaterials and composites, and as importantly, their desired properties and performance in a designed functionality. In (1), we will study a series of nanostructures with different composition, morphology, structure and size, involving two most technologically relevant elements, silicon and carbon, and many metal oxide semiconductors including titanium oxide, zinc oxide and tin oxide as well as nanometallic system and nanocarbon composites (e.g. Pt nanoparticles supported on carbon nanotube and graphene). We will continue to develop methodologies for controlled synthesis of nanomaterials with desired composition, size, morphology, crystal structure and in X-ray spectroscopy characterization (absorption and photoelectron) using a tunable X-ray source (synchrotron). In (2), we have developed a number of powerful techniques over the last ten years when the Canadian Light Source (CLS) became available for furthering in-depth investigation and development. These developments (e.g. X-ray excited optical luminescence in both the energy and time domain can track energy and charge transfer dynamics in nanostructures of different morphology, size and defect distribution), which I led as a Beam-team Leader of the SGM (250 -2 keV), PGM (10 – 250 eV) and SXRMB (1.8-10 keV) beamline at the Canadian Light Source, has greatly enhanced the capabilities in advancing program (1) described above. We will continue to perfect these capabilities – significant areas: (a) a state-of-the-art hard X-ray photoelectron spectroscopy station (up to 10 keV X-ray energy with excellent sensitivity and energy resolution) recently commissioned at the SXRMB beamline of the CLS will deliver unprecedented capabilities to investigate the underlayer and buried interface; (b) a state-of-the-art soft X-ray microprobe (speciation of elements relevant to environment and biomaterials, e.g. Ca, S, P, Cl and K, and catalysts, e.g. Rh, Pd and Ag) is under commission; (c) a state-of-the-art optical streak camera on the SGM beamline at CLS (first in all synchrotrons) to study the dynamics in the conversion of X-ray into visible light by nanostructures, which in turn reveals the electronic structure of the system; (d) both SGM and PGM at CLS are being upgraded with elliptically polarized undulators and KB mirrors to provide polarization tunability and microbeam capabilities, further enhancing the already highly productive facilities at the CLS; and (e) a state-of-the-art X-ray emission analyser based on the MiniXS design for high resolution X-ray fluorescence from the Ce L3 and Tb L3 edge. The analyzer using Ge(440) crystals on a Rowland circle combined with a pixel array detector (e.g. the Pilatus 100K PAD) provides a resolution of ~ 0.8 eV at ~ 4500 eV for X-ray emission (RIXS and RXES) studies. The proposed research will not only enhance the synergy of materials (properties, performance, etc.) and synchrotron analysis capabilities for my research but also provides unprecedented techniques to the CLS users’ community.

我们建议在两个密切相关的方面进行研究：(1)功能纳米材料的基本性质及其在能源、环境、药物传递和金属-生物材料界面方面的应用；(2)基于同步加速器的先进光子技术的开发和应用，特别是高能分辨率电子能谱、高能分辨率x射线（吸收和发射）能谱和显微镜在追踪功能纳米材料和复合材料电子行为方面的应用；它们在设计的功能中所期望的属性和性能。