Ortega-Liebana M Carmen, Hueso Jose L, Fernandez-Pacheco Rodrigo, Irusta Silvia, Santamaria Jesus
Institute of Nanoscience of Aragon (INA) , Department of Chemical Engineering and Environmental Technology , University of Zaragoza , 50018 Zaragoza , Spain . Email:
Nerworking Research Center on Bioengineering, Biomaterials and Nanomedicine (CIBER-BBN) , 28029 Madrid , Spain.
Chem Sci. 2018 Aug 24;9(40):7766-7778. doi: 10.1039/c8sc03112f. eCollection 2018 Oct 28.
Herein we report on a novel inorganic peroxidase-mimicking nanocatalyst activated under blue LED photoirradiation. A novel flash-pyrolysis method has been developed for the generation of strong blue photoluminescence (PL) centers attributed to silicon and carbon-based sites within a mesoporous SBA-15 silica nanorod platform. The type of centers and their PL response can be controlled by varying the flash thermal treatment conditions. By tailoring the operating conditions the system can be driven towards the preferential generation of carbon-based luminescent centers, with or without the simultaneous generation of silicon-based centers. The properties and the nature of these luminescent centers within the mesoporous nanorods have been thoroughly corroborated by a battery of characterization techniques including fluorescence spectroscopy, X-ray photoelectron spectroscopy (XPS) and electron energy loss spectroscopy (EELS) at the local level of the structures combined with scanning transmission electron microscopy (STEM) imaging. In addition, these luminescent mesoporous nanorods have been successfully tested as robust photocatalysts able to display peroxidase-like activity and indirect glucose sensing in a wider range of pH conditions compared to the natural enzyme, especially when carbogenic dots and oxygen-deficient silica centers are simultaneously present in the structure.
在此，我们报道了一种在蓝色发光二极管光照射下被激活的新型无机类过氧化物酶纳米催化剂。已开发出一种新型快速热解方法，用于在介孔SBA - 15二氧化硅纳米棒平台内生成归因于硅和碳基位点的强蓝色光致发光（PL）中心。通过改变快速热处理条件，可以控制中心的类型及其PL响应。通过调整操作条件，该系统可以被驱动优先生成碳基发光中心，同时或不同时生成硅基中心。介孔纳米棒内这些发光中心的性质和本质已通过一系列表征技术得到充分证实，这些技术包括荧光光谱、X射线光电子能谱（XPS）以及在结构局部水平结合扫描透射电子显微镜（STEM）成像的电子能量损失谱（EELS）。此外，这些发光介孔纳米棒已成功作为强大的光催化剂进行测试，与天然酶相比，它们能够在更宽的pH条件范围内显示类过氧化物酶活性和间接葡萄糖传感，特别是当结构中同时存在碳源点和缺氧二氧化硅中心时。
