Assembly-promoted photocatalysis: Three-dimensional assembly of CdSxSe(1-x) (x = 0-1) quantum dots into nanospheres with enhanced photocatalytic performance

作者：Wang, Lina; Di, Qiumei; Sun, Mingming; Liu, Jia; Cao, Chuanbao; Liu, Jiajia; Xu, Meng; Zhang, Jiatao^*

来源：Journal of Materiomics, 2017, 3(1): 63-70.

DOI：10.1016/j.jmat.2016.11.008

• CdSxSe(1-x) quantum dots
• Three-dimensionally assembly
• Colloidal nanospheres
• Photocatalysis

In this paper, through an emulsion-based bottom-up self-assembly method, monodisperse CdSxSe(1-x) (x-0-1) quantum dots (QDs) with tailoring compositions have been three-dimensionally assembled into spherical architectures in sub-micrometer sizes. UV-Vis absorption measurements revealed the enhanced light harvesting abilities of the assembled CdSxSe(1-x) spheres relative to their constituting QDs. HRTEM characterizations over the CdSxSe(1-x) assemblies suggested the existence of localized oriented adjoining of the CdSxSe(1-x) QDs and the resulting nano-twin structures that are favorable for photogenerated electron-hole separation. The quenching of photoluminescence and the improvement in IPCE after the assembly of CdSxSe(1-x) QDs provided a clue to the likely suppressed electron-hole recombination brought about by the unique architectures and interfaces derived from self-assembly. The above findings were coincided with the remarkably improved H-2 evolution activities observed for the well-assembled CdSxSe(1-x) nanospheres in photocatalytic water splitting, underpinning the importance of the alternative strategy to design advanced semiconductor photocatalysts based on architectural engineering.

• 出版日期2017-3
• 单位北京理工大学