Shape control of CdSe/CdS nanocrystals during shell formation and growth: Dominating effects of surface ligands over core crystal structure

Hao, Junjie1,2,3,4; Liu, Haochen2,3,5,6; Duan, Xijian2,3,7; Zhou, Ziming2,3,7; Zhao, Bingxin2,3; Zhang, Wenda2,3,9; Xu, Bing8; Sun, Xiao Wei2,3,7,8; Delville, Marie-Helene1

2023-06-01

10.1007/s40843-023-2481-1

SCIENCE CHINA-MATERIALS   影响因子和分区

2095-8226

2199-4501

CdSe/CdS nanocrystals (NCs) are among the most studied semiconductor nanocrystals, yet there is still much information to be gained. This work reveals that core@shell NCs with different shapes are more controlled by the interaction between the NC surface and the capping ligands than the core concentration, but not at all by the difference in the crystalline nature of the core. Among the precursors, cadmium carboxylates promote an isotropic structure, while conversely, long-chain cadmium phosphonates favor an anisotropic one. Cadmium carboxylates are critical in the formation of the headshell, while cadmium phosphonates play a role in the anisotropic tail growth. Against expectations, the CdSe-core crystal structure (zinc blende or wurtzite) plays very little role in determining the structure of the final shape, which may be due to the two-stage CdS shell formation process, and gives rise to a tadpole shape. With appropriate capping ligands, precise control of the CdSe/CdS structures can be achieved in both shape formation and growth process. We claim, here, that CdSe/CdS with morphologies as different as tadpoles, nanoflowers, dot-in-rods, and tetrapods are obtained with only varying surface ligand ratios. This unique crystal-growth mechanism can be applied to other seed-mediated methods to produce aniso-tropic nanostructures.

tadpole shape CdSe CdS NCs shell growth control effects of surface ligands core crystal structure

SCI ; EI

英语

通讯

National Key Research and Development Program of China["2022YFB3602903","2021YFB3602703","2022YFB3606504"] ; National Natural Science Foundation of China["62204107","12204229"] ; Guangdong Basic and Applied Basic Research Foundation[2022A1515011614] ; Shenzhen Science and Technology Program[JCYJ20220818100411025] ; Shenzhen Key Laboratory for Advanced Quantum Dot Displays and Lighting[ZDSYS201707281632549] ; Ping-shan District Innovation Platform Project of Shenzhen Hi-tech Zone Development Special Plan in 2022[29853M-KCJ-2023-002-01]

Materials Science

Materials Science, Multidisciplinary

WOS:001023963600001

SCIENCE PRESS

20232814369156

Anisotropy ; Cadmium ; Cadmium sulfide ; Carboxylation ; II-VI semiconductors ; Ligands ; Nanocrystals ; Selenium compounds ; Zinc sulfide

Nonferrous Metals and Alloys excluding Alkali and Alkaline Earth Metals:549.3 ; Semiconducting Materials:712.1 ; Nanotechnology:761 ; Physical Chemistry:801.4 ; Chemical Reactions:802.2 ; Chemical Products Generally:804 ; Inorganic Compounds:804.2 ; Physical Properties of Gases, Liquids and Solids:931.2 ; Crystalline Solids:933.1 ; Crystal Lattice:933.1.1

Web of Science

1.Univ Bordeaux, CNRS, Bordeaux INP, ICMCB,UMR 5026, F-33608 Pessac, France
2.Southern Univ Sci & Technol, Inst Nanosci & Applicat, Shenzhen 518055, Peoples R China
3.Southern Univ Sci & Technol, Dept Elect & Elect Engn, Shenzhen 518055, Peoples R China
4.Shenzhen Technol Univ, Coll Integrated Circuits & Optoelect Chips, Shenzhen 518118, Peoples R China
5.City Univ Hong Kong, Dept Mat Sci & Engn, Hong Kong 999077, Peoples R China
6.City Univ Hong Kong, Ctr Funct Photon CFP, Hong Kong 999077, Peoples R China
7.Southern Univ Sci & Technol, Key Lab Energy Convers & Storage Technol, Minist Educ, Shenzhen 518055, Peoples R China
8.Shenzhen Planck Innovat Technol Co Ltd, Shenzhen 518173, Peoples R China
9.Hainan Univ, Hainan Prov Key Lab Fine Chem, Haikou 570228, Peoples R China

Hao, Junjie,Liu, Haochen,Duan, Xijian,et al. Shape control of CdSe/CdS nanocrystals during shell formation and growth: Dominating effects of surface ligands over core crystal structure[J]. SCIENCE CHINA-MATERIALS,2023,66(9):3621-3628.

Hao, Junjie.,Liu, Haochen.,Duan, Xijian.,Zhou, Ziming.,Zhao, Bingxin.,...&Delville, Marie-Helene.(2023).Shape control of CdSe/CdS nanocrystals during shell formation and growth: Dominating effects of surface ligands over core crystal structure.SCIENCE CHINA-MATERIALS,66(9),3621-3628.

Hao, Junjie,et al."Shape control of CdSe/CdS nanocrystals during shell formation and growth: Dominating effects of surface ligands over core crystal structure".SCIENCE CHINA-MATERIALS 66.9(2023):3621-3628.