Stepanidenko Evgeniia A, Gromova Yulia A, Kormilina Tatiana K, Cherevkov Sergei A, Kurshanov Danil A, Dubavik Aliaksei, Baranov Mikhail A, Medvedev Oleg S, Fedorov Anatoly V, Gun'ko Yurii K, Ushakova Elena V, Baranov Alexander V
ITMO University, Saint Petersburg, 197101, Russia.
Saint-Petersburg State University, Saint Petersburg, 199034, Russia.
Sci Rep. 2019 Jan 24;9(1):617. doi: 10.1038/s41598-018-36250-1.
Quantum dots (QDs) have been envisaged as very promising materials for the development of advanced optical sensors. Here we report a new highly porous luminescent material based on colloidal QDs for potential applications in optical sensing devices. Bulk flower-like porous structures with sizes of hundreds of microns have been produced by slow destabilization of QD solution in the presence of a non-solvent vapor. The porous highly luminescent material was formed from CdSe QDs using the approach of non-solvent destabilization. This material demonstrated a 4-fold decrease in PL signal in the presence of the ammonia vapor. The relationship between the destabilization rate of QDs in solution and the resulting morphology of structural elements has been established. The proposed model of bulk porous flower-like nanostructured material fabrication can be applied to nanoparticles of different nature combining their unique properties. This research opens up a new approach to design novel multi-component composite materials enabling potential performance improvements of various photonic devices.
量子点（QDs）被视为开发先进光学传感器的极具前景的材料。在此，我们报告一种基于胶体量子点的新型高孔隙率发光材料，用于光学传感设备的潜在应用。通过在非溶剂蒸汽存在下使量子点溶液缓慢失稳，制备出了尺寸为数百微米的块状花状多孔结构。采用非溶剂失稳方法，由CdSe量子点形成了多孔高发光材料。该材料在氨蒸汽存在下PL信号降低了4倍。已建立溶液中量子点失稳速率与所得结构元素形态之间的关系。所提出的块状多孔花状纳米结构材料制备模型可应用于不同性质的纳米颗粒，结合它们的独特性能。这项研究开辟了一种设计新型多组分复合材料的新方法，有望改善各种光子器件的性能。
