Facile synthesis, microstructure and photophysical properties of core-shell nanostructured (SiCN)/BN nanocomposites.
Facile synthesis, microstructure and photophysical properties of core-shell nanostructured (SiCN)/BN nanocomposites.
复制标题
核壳纳米结构（SiCN）/BN纳米复合材料的简便合成、微观结构和光物理性质
DOI：
10.1038/srep39866
复制
发表时间：
2017-01-13
影响因子：
4.6
通讯作者：
Zhou Y
中科院分区：
文献类型：
--
作者：
Zhang Q;Jia D;Yang Z;Cai D;Laine RM;Li Q;Zhou Y
在纳米尺度上增加结构复杂性可以允许对半导体衍生的半导体中的物理性质的上级控制。我们在这里展示了通过聚合物前体路线合成碳氮化硅（SiCN）/氮化硼（BN）纳米复合材料，其中钴多胺络合物用作催化剂，表现出新颖的复合材料结构和物理性能。高分辨率透射电子显微镜（HRTEM）分析表明，SiCN-BN核-壳纳米复合材料和BN壳的直径分别为50 - 400 nm和5 - 25 nm。还观察到BN纳米片（BNNSs），其平均片尺寸为5 nm至15 nm。这些纳米复合材料的光物理性能的特点是使用紫外-可见光和光致发光（PL）分析。所制备的复合材料具有发射行为，包括在BN掺杂的SiCN中观察到的发射寿命比SiC纳米颗粒中观察到的发射寿命长2.5 ns（±20 ps）。我们的研究结果表明，SiCN/BN纳米复合材料作为半导体显示上级宽度的光致发光的波长跨越可见光到近红外（NIR）光谱范围（400 〜 700 nm），由于SiC（N）纳米线芯和BN纳米片壳之间的界面的异质结。
Increasing structural complexity at nanoscale can permit superior control over photophysical properties in the precursor-derived semiconductors. We demonstrate here the synthesis of silicon carbonitride (SiCN)/boron nitride (BN) nanocomposites via a polymer precursor route wherein the cobalt polyamine complexes used as the catalyst, exhibiting novel composite structures and photophysical properties. High Resolution Transmission Electron Microscopy (HRTEM) analysis shows that the diameters of SiCN−BN core−shell nanocomposites and BN shells are 50‒400 nm and 5‒25 nm, respectively. BN nanosheets (BNNSs) are also observed with an average sheet size of 5‒15 nm. The photophysical properties of these nanocomposites are characterized using the UV-Vis and photoluminescence (PL) analyses. The as-produced composites have emission behavior including an emission lifetime of 2.5 ns (±20 ps) longer observed in BN doped SiCN than that seen for SiC nanoparticles. Our results suggest that the SiCN/BN nanocomposites act as semiconductor displaying superior width photoluminescence at wavelengths spanning the visible to near-infrared (NIR) spectral range (400‒700 nm), owing to the heterojunction of the interface between the SiC(N) nanowire core and the BN nanosheet shell.