Combination of Cation Exchange and Quantized Ostwald Ripening for Controlling Size Distribution of Lead Chalcogenide Quantum Dots
Abstract
A new strategy for narrowing the size distribution of colloidal quantum dots (QDs) was developed by combining cation exchange and quantized Ostwald ripening. Medium-sized reactant CdS(e) QDs were subjected to cation exchange to form the target PbS(e) QDs, and then small reactant CdS(e) QDs were added which were converted to small PbS(e) dots via cation exchange. The small-sized ensemble of PbS(e) QDs dissolved completely rapidly and released a large amount of monomers, promoting the growth and size-focusing of the medium-sized ensemble of PbS(e) QDs. The addition of small reactant QDs can be repeated to continuously reduce the size distribution. The new method was applied to synthesize PbSe and PbS QDs with extremely narrow size distributions and as a bonus they have hybrid surface passivation. In conclusion, the size distribution of prepared PbSe and PbS QDs are as low as 3.6% and 4.3%, respectively, leading to hexagonal close packing in monolayer and highly ordered three-dimensional superlattice.
- Authors:
-
- Huazhong Univ. of Science and Technology, Hubei (China)
- National Renewable Energy Lab. (NREL), Golden, CO (United States)
- Huazhong Univ. of Science and Technology, Hubei (China); Huazhong Univ. of Science and Technology, Guangdong (China)
- Publication Date:
- Research Org.:
- National Renewable Energy Laboratory (NREL), Golden, CO (United States); Energy Frontier Research Centers (EFRC) (United States). Center for Advanced Solar Photophysics (CASP)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1360666
- Report Number(s):
- NREL/JA-5900-67789
Journal ID: ISSN 0897-4756
- Grant/Contract Number:
- AC36-08GO28308
- Resource Type:
- Journal Article: Accepted Manuscript
- Journal Name:
- Chemistry of Materials
- Additional Journal Information:
- Journal Volume: 29; Journal Issue: 8; Journal ID: ISSN 0897-4756
- Publisher:
- American Chemical Society (ACS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; quantum dot surface chemistry; quantum dots; PbS; PbSe; quantum dot synthesis
Citation Formats
Zhang, Changwang, Xia, Yong, Zhang, Zhiming, Huang, Zhen, Lian, Linyuan, Miao, Xiangshui, Zhang, Daoli, Beard, Matthew C., and Zhang, Jianbing. Combination of Cation Exchange and Quantized Ostwald Ripening for Controlling Size Distribution of Lead Chalcogenide Quantum Dots. United States: N. p., 2017.
Web. doi:10.1021/acs.chemmater.7b00411.
Zhang, Changwang, Xia, Yong, Zhang, Zhiming, Huang, Zhen, Lian, Linyuan, Miao, Xiangshui, Zhang, Daoli, Beard, Matthew C., & Zhang, Jianbing. Combination of Cation Exchange and Quantized Ostwald Ripening for Controlling Size Distribution of Lead Chalcogenide Quantum Dots. United States. https://doi.org/10.1021/acs.chemmater.7b00411
Zhang, Changwang, Xia, Yong, Zhang, Zhiming, Huang, Zhen, Lian, Linyuan, Miao, Xiangshui, Zhang, Daoli, Beard, Matthew C., and Zhang, Jianbing. 2017.
"Combination of Cation Exchange and Quantized Ostwald Ripening for Controlling Size Distribution of Lead Chalcogenide Quantum Dots". United States. https://doi.org/10.1021/acs.chemmater.7b00411. https://www.osti.gov/servlets/purl/1360666.
@article{osti_1360666,
title = {Combination of Cation Exchange and Quantized Ostwald Ripening for Controlling Size Distribution of Lead Chalcogenide Quantum Dots},
author = {Zhang, Changwang and Xia, Yong and Zhang, Zhiming and Huang, Zhen and Lian, Linyuan and Miao, Xiangshui and Zhang, Daoli and Beard, Matthew C. and Zhang, Jianbing},
abstractNote = {A new strategy for narrowing the size distribution of colloidal quantum dots (QDs) was developed by combining cation exchange and quantized Ostwald ripening. Medium-sized reactant CdS(e) QDs were subjected to cation exchange to form the target PbS(e) QDs, and then small reactant CdS(e) QDs were added which were converted to small PbS(e) dots via cation exchange. The small-sized ensemble of PbS(e) QDs dissolved completely rapidly and released a large amount of monomers, promoting the growth and size-focusing of the medium-sized ensemble of PbS(e) QDs. The addition of small reactant QDs can be repeated to continuously reduce the size distribution. The new method was applied to synthesize PbSe and PbS QDs with extremely narrow size distributions and as a bonus they have hybrid surface passivation. In conclusion, the size distribution of prepared PbSe and PbS QDs are as low as 3.6% and 4.3%, respectively, leading to hexagonal close packing in monolayer and highly ordered three-dimensional superlattice.},
doi = {10.1021/acs.chemmater.7b00411},
url = {https://www.osti.gov/biblio/1360666},
journal = {Chemistry of Materials},
issn = {0897-4756},
number = 8,
volume = 29,
place = {United States},
year = {Wed Mar 22 00:00:00 EDT 2017},
month = {Wed Mar 22 00:00:00 EDT 2017}
}
Web of Science
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