Size-dependent optical properties and enhanced visible light photocatalytic activity of wurtzite CdSe hexagonal nanoflakes with dominant {001} facets

作者：Han, Guoping; Wang, Lin; Pei, Cuijin; Shi, Ruyu; Liu, Bin; Zhao, Hua; Yang, Heqing^*; Liu, Shengzhong

来源：Journal of Alloys and Compounds, 2014, 610: 62-68.

DOI：10.1016/j.jallcom.2014.04.164

• CdSe hexagonal nanoflakes
• Selective adsorption
• Oleylamine
• Optical property
• Photocatalytic activity

CdSe hexagonal nanoflakes have been synthesized via a reaction of CdCl2-oleylamine with Se-tri-n-octylphosphine at 300 degrees C for 30 min. The CdSe hexagonal nanoflakes with the typical side lengths of 9.5-12.3 nm are single-crystalline wurtzite structure and are enclosed by {001} top and down surfaces. Size control of the CdSe nanoflakes from 3.3 to 18.6 nm is achieved by adjusting reaction temperature and time, and the size-dependent absorption and photoluminescence properties are observed. The formation of CdSe hexagonal nanoflakes results from the selective adsorption of oleylamine on the (001) prismatic facet. The as-obtained CdSe nanoflakes with exposed {001} facets show higher photocatalytic activity than CdSe commercial powders for degradation of malachite green. The present study motivates us to further explore new synthetic methods for the preparation of other II-VI semiconductor with a high percentage of reactive facets.

• 出版日期2014-10-15
• 单位西安建筑科技大学; 陕西师范大学