Department of Chemical and Environmental Engineering, Pusan National University, Busan, 46241, Korea.
Department of Chemical and Environmental Engineering and Nanosystems Engineering Research Center for Nanotechnology-Enabled Water Treatment (NEWT), Yale University, New Haven, CT, 06511, USA.
Small. 2020 Sep;16(35):e2002311. doi: 10.1002/smll.202002311. Epub 2020 Aug 2.
Here, a novel, versatile synthetic strategy to fabricate a yolk-shell structured material that can encapsulate virtually any functional noble metal or metal oxide nanocatalysts of any morphology in a free suspension fashion is reported. This strategy also enables encapsulation of more than one type of nanoparticle inside a single shell, including paramagnetic iron oxide used for magnetic separation. The mesoporous organosilica shell provides efficient mass transfer of small target molecules, while serving as a size exclusion barrier for larger interfering molecules. Major structural and functional advantages of this material design are demonstrated by performing three proof-of-concept applications. First, effective encapsulation of plasmonic gold nanospheres for localized photothermal heating and heat-driven reaction inside the shell is shown. Second, hydrogenation catalysis is demonstrated under spatial confinement driven by palladium nanocubes. Finally, the surface-enhanced Raman spectroscopic detection of model pollutant by gold nanorods is presented for highly sensitive environmental sensing with size exclusion.
这里，报道了一种新颖、通用的合成策略，用于制造一种蛋黄壳结构的材料，可以以自由悬浮的方式封装几乎任何形态的功能性贵金属或金属氧化物纳米催化剂。该策略还能够在单个壳体内封装超过一种类型的纳米颗粒，包括用于磁分离的顺磁性氧化铁。介孔有机硅壳提供了小分子靶标高效的传质，同时作为大分子干扰物的尺寸排除屏障。通过执行三个概念验证应用，证明了这种材料设计的主要结构和功能优势。首先，展示了等离子体金纳米球的有效封装，用于壳内的局域光热加热和热驱动反应。其次，展示了钯纳米立方体驱动的空间受限下的加氢催化。最后，提出了通过金纳米棒进行表面增强拉曼光谱检测模型污染物，用于具有尺寸排除的高灵敏度环境传感。
