Synthesis of SBA-15 assembled with silicon nanoparticles with different morphologies for oxygen sensing
Synthesis of SBA-15 assembled with silicon nanoparticles with different morphologies for oxygen sensing
复制标题
不同形貌硅纳米粒子组装的SBA-15的合成用于氧传感
DOI：
10.1016/j.micromeso.2020.110001
复制
发表时间：
2020-04-01
影响因子：
5.2
通讯作者：
Zhang, Haoran
中科院分区：
文献类型：
--
作者：
Gong, Ting;Li, Yanjuan;Zhang, Haoran
本文主要研究了球形介孔SBA-15（SPSBA-15）、长棒状介孔SBA-15（LRSBA-15）和六棱柱状介孔SBA-15（HPSBA-15）三种不同形貌的介孔SBA-15中荧光硅纳米粒子的制备及其氧传感性能。研究了介孔材料的结构与传感性能之间的关系。采用小角粉末X射线衍射（SAXRD）、傅里叶变换红外光谱（FT-IR）、BET、DFT和XPS等测试手段对样品进行了结构表征。合成的介孔材料SPSBA-15、LRSBA-15和HPSBA-15具有丰富的无机骨架Si-O-Si键和较高的比表面积。其中，HPSBA-15介孔材料的比表面积最大。因此，在介孔HPSBA-15中，Si NP的添加体积为8 ml。同时，杂化材料表现出最短的响应时间为2.2 s，恢复时间为11.2 s。该结果可归因于具有大表面积和窄孔径分布的HPSBA-15材料支撑的均匀且几乎平行的多孔结构。因此，使用具有更大BET比表面积的介孔SBA-15材料可以改善氧传感性能。
In this paper, our effort is focused on preparation and oxygen sensing of fluorescent silicon nanoparticles (Si NPs) assembled in three kinds of mesoporous SBA-15 with different morphologies, including spherical mesoporous SBA-15 (SPSBA-15), long rod-like mesoporous SBA-15 (LRSBA-15) and hexagonal prism-like mesoporous SBA-15 (HPSBA-15). The relationship of structure and sensing properties in mesoporous materials is studied. Small angle powder X-ray diffraction (SAXRD), Fourier transform infrared spectrometer (FT-IR), Brunauer-Emmett-Teller (BET), Discrete-Fourier-Transform (DFT) analyses and X-ray photoelectron spectroscopy (XPS) are used to characterize their structural properties. The obtained mesoporous SPSBA-15, LRSBA-15 and HPSBA-15 possess abundant Si-O-Si bands of the inorganic framework and high surface-volume ratios. Particularly, mesoporous HPSBA-15 materials exhibit the largest surface areas than other two mesoporous materials. Accordingly, the adding volume of Si NPs was 8 ml in mesoporous HPSBA-15. At the same time, the hybrid materials show the shortest response time of 2.2 s and recovery time of 11.2 s. This result can be attributed to the uniform and nearly parallel porous structure of the HPSBA-15 materials supporting with large surface areas and narrow pore size distributions. Therefore, the properties in oxygen sensing can be improved by using mesoporous SBA-15 materials with larger BET surface area.