Hu Pengfei, Xie Chen, Mao Zhihui, Liang Xue
Laboratory for Microstructures, Shanghai University, Shanghai 200444, China.
Nanomaterials (Basel). 2019 Sep 15;9(9):1325. doi: 10.3390/nano9091325.
The assistances of sodium dodecyl benzene sulfonate (SDBS) and aging treatment were introduced to further improve the room-temperature mechanochemical synthesis of the quantum-sized zinc sulfide (ZnS) nanocrystals. As a result, a green strategy for synthesizing the monodisperse nanocrystals with tunable size and crystallinity was developed, holding convenient, highly efficient and low pollution. Size evolution shows a gradually increasing trend along the aging-temperature. A model that the independent reaction cells constructed by SDBS-wrapped reactant packages (solid state vesicles, SSVs) for the confined growth of ZnS nanocrystals was proposed to access the formation mechanism of ZnS quantized crystal in a solid-state synthesis system. The band gaps and band-edge luminescent emissions of as-prepared ZnS nanocrystals experienced the size-dependent quantum confinement effect, while the trap-state emissions exhibited the lattice integrity-dependence. Furthermore, ZnS quantum-sized nanocrystals with narrower size distribution can be obtained by a batch-sorting process through adjusting the centrifugal speed.
引入十二烷基苯磺酸钠（SDBS）辅助及老化处理，以进一步改进量子尺寸硫化锌（ZnS）纳米晶体的室温机械化学合成。结果，开发出一种绿色策略，用于合成尺寸和结晶度可调的单分散纳米晶体，具有便捷、高效和低污染的特点。尺寸演变显示出沿老化温度逐渐增加的趋势。提出了一个模型，即由SDBS包裹的反应物包（固态囊泡，SSV）构建的独立反应单元用于ZnS纳米晶体的受限生长，以探究固态合成体系中ZnS量子化晶体的形成机制。所制备的ZnS纳米晶体的带隙和带边发光发射经历了尺寸依赖的量子限制效应，而陷阱态发射则表现出晶格完整性依赖性。此外，通过调整离心速度进行分批分选过程，可以获得尺寸分布更窄的ZnS量子尺寸纳米晶体。
