Anisotropic Arm Growth in Unconventional Semiconductor CdSe/CdS Nanotetrapod Synthesis Using Core/Shell CdSe/CdS as Seeds

Wang, Xudong1; Chen, Shutang1; Thota, Sravan1; Wang, Yongchen1; Tan, Haiyan2; Tang, Min3; Quan, Zewei3; Zhao, Jing1,2

2019-08-08

10.1021/acs.jpcc.9b05456

Journal of Physical Chemistry C   影响因子和分区

1932-7447

1932-7455

Anisotropic semiconductor CdSe/CdS tetrapods exhibit unique dimension-dependent quantum confinement and efficient charge separation/transport along the arms, making them useful in a wide range of optoelectronic applications. Traditionally, the CdSe/CdS tetrapods were produced by anisotropic CdS growth on the zinc blende CdSe core, induced by ligands that selectively bind to specific facets of CdSe. In this work, we report an unconventional method to grow CdSe/CdS nanotetrapods using wurtzite CdSe/CdS core/shell nanocrystals as seeds, without the aid of selective-binding ligands. The CdS layer thickness in the seeds and the Cd and S precursor concentrations have a significant impact on the morphology of CdS growth. The tetrapods we obtained have one arm much longer than the other three. Through a detailed transmission electron microscopy study, we found the anisotropic arms resulted from the stacking faults occurred in the growth, which induced a local phase change from wurtzite to zinc blende at one end of the CdSe/CdS nanocrystal. This special crystal growth mechanism can be applied to other seed-mediated methods to produce anisotropic nanostructures.

SCI ; EI

英语

其他

National Science Foundation[CHE-1554800]

Chemistry ; Science & Technology - Other Topics ; Materials Science

Chemistry, Physical ; Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary

WOS:000480502300050

AMER CHEMICAL SOC

20193307317471

Anisotropy ; Cadmium sulfide ; High resolution transmission electron microscopy ; II-VI semiconductors ; Ligands ; Nanocrystals ; Selenium compounds ; Zinc ; Zinc sulfide

Zinc and Alloys:546.3 ; Optical Devices and Systems:741.3 ; Nanotechnology:761 ; Physical Chemistry:801.4 ; Chemical Products Generally:804 ; Inorganic Compounds:804.2 ; Physical Properties of Gases, Liquids and Solids:931.2

Web of Science

1.Univ Connecticut, Dept Chem, 55 North Eagleville Rd, Storrs, CT 06269 USA
2.Univ Connecticut, Inst Mat Sci, Storrs, CT 06269 USA
3.Southern Univ Sci & Technol SUSTech, Dept Chem, Shenzhen 518055, Guangdong, Peoples R China

Wang, Xudong,Chen, Shutang,Thota, Sravan,et al. Anisotropic Arm Growth in Unconventional Semiconductor CdSe/CdS Nanotetrapod Synthesis Using Core/Shell CdSe/CdS as Seeds[J]. Journal of Physical Chemistry C,2019,123(31):19238-19245.

Wang, Xudong.,Chen, Shutang.,Thota, Sravan.,Wang, Yongchen.,Tan, Haiyan.,...&Zhao, Jing.(2019).Anisotropic Arm Growth in Unconventional Semiconductor CdSe/CdS Nanotetrapod Synthesis Using Core/Shell CdSe/CdS as Seeds.Journal of Physical Chemistry C,123(31),19238-19245.

Wang, Xudong,et al."Anisotropic Arm Growth in Unconventional Semiconductor CdSe/CdS Nanotetrapod Synthesis Using Core/Shell CdSe/CdS as Seeds".Journal of Physical Chemistry C 123.31(2019):19238-19245.