Synthesis of ternary Zn_xCd_(1_x)S nanowires by thermal evaporation and the study of their photoluminescence

摘要

Ternary Zn_xCd_(1-x)S nanowires were synthesized on Au-coated Si (100) substrates by thermal evaporation method. The nanowires obtained under ambient and reduced pressure of ～100 Torr were studied and compared. Both of them were single crystalline wurtzite structured with similar chemical composition. The tip of the nanowires obtained in ambient pressure contained an Au-rich particle, but that obtained under reduced pressure was impurity-free. Hence, both vapor-liquid-solid (VLS) and mixed vapor-solid (VS)-VLS growth mechanisms were proposed for these two types of nanowires. Furthermore, photoluminescence studies revealed that their intrinsic and extrinsic emission bands were within the visible region.