1
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Chen Q, Zhang Y, Chen S, Liu Y, Zhang C, Zhang M, Yu K. Surface-Ligand Tuned Reversible Transformations in Aqueous Environments Between CdSe Magic-Size Clusters and Their Precursor Compounds. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2024; 20:e2304277. [PMID: 37806760 DOI: 10.1002/smll.202304277] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/22/2023] [Revised: 09/17/2023] [Indexed: 10/10/2023]
Abstract
That magic-size clusters (MSCs) have their counterpart precursor compounds (PCs) has not been generally accepted by expertise circles. Here, experimental evidence to support this new concept is presented. With aqueous-phase CdSe MSCs as a model system, it is shown that when the MSCs are dispersed in water containing a certain amount of L-cysteine (Cys), the MSCs disappear slowly. Upon the addition of CdCl2 , the MSCs recover. It is proposed that after dispersing, the MSCs transform to their quasi-isomeric, non-absorbing PCs upon Cys addition. In the presence of CdCl2 , the PCs transform back to the MSCs due to Cys elimination. The surface ligand Cys of the MSCs plays a significant role in the reversible transformations. The present study provides compelling evidence that absorbing MSCs have their non-absorbing PCs. The study findings suggest that the transformation between two MSCs that display absorption spectral shifts in a stepwise pattern is assisted by their PCs.
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Affiliation(s)
- Qingyuan Chen
- Institute of Atomic and Molecular Physics, Sichuan University, Chengdu, 610065, P. R. China
| | - Yu Zhang
- School of Chemical Engineering, Sichuan University, Chengdu, 610065, P. R. China
| | - Shuo Chen
- Engineering Research Center in Biomaterials, Sichuan University, Chengdu, 610065, P. R. China
| | - Yuehui Liu
- Engineering Research Center in Biomaterials, Sichuan University, Chengdu, 610065, P. R. China
| | - Chunchun Zhang
- Analytical and Testing Center, Sichuan University, Chengdu, 610065, P. R. China
| | - Meng Zhang
- Institute of Atomic and Molecular Physics, Sichuan University, Chengdu, 610065, P. R. China
| | - Kui Yu
- Institute of Atomic and Molecular Physics, Sichuan University, Chengdu, 610065, P. R. China
- Engineering Research Center in Biomaterials, Sichuan University, Chengdu, 610065, P. R. China
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2
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Li Y, Xu J, Guan Q, Zhang H, Ding Z, Wang Q, Wang Z, Han J, Liu M, Zhao Y. Impact of hypromellose acetate succinate and Soluplus® on the performance of β-carotene solid dispersions with the aid of sorbitan monolaurate: In vitro-in vivo comparative assessment. Int J Biol Macromol 2023; 253:126639. [PMID: 37657570 DOI: 10.1016/j.ijbiomac.2023.126639] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2023] [Revised: 08/25/2023] [Accepted: 08/29/2023] [Indexed: 09/03/2023]
Abstract
Solid dispersions (SDs) possess the potential to enhance the bioavailability of insoluble active pharmaceutical ingredients (APIs) by effectively converting them into amorphous state. However, SDs have a tendency to recrystallize unless appropriate excipients are employed. The objective of this study was to evaluate the ability of hypromellose acetate succinate HF (HPMCAS-HF) and Soluplus® to inhibit the recrystallization of β-carotene and improve its in vivo bioavailability through the fabrication of ternary β-carotene solid dispersions (SDs) with the aid of specific surfactant. Due to rapid micellization, the dissolution profiles of β-carotene SDs based on HPMCAS-HF/Span 20 (5:5, w/w) or Soluplus®/Span 20 (6:4, w/w) combinations exhibited significant improvement, which were almost 7-10 times higher than β-carotene bulk powder. DSC and PXRD analysis indicated a notable reduction in the crystallinity degree of β-carotene within the SDs. The stability study demonstrated a half-life of β-carotene in the SDs exceeding 30 days. Additionally, the in vivo pharmacokinetics analysis confirmed that the cellulose derivatives/surfactant combinations significantly enhanced the bioavailability of β-carotene by 1.37-fold and 2.3-fold, respectively. Notably, the HPMCAS-HF/Span 20 combination exhibited superior performance. Consequently, the HPMCAS-HF/Span 20 combination held potential for the advancement of an effective drug delivery system for β-carotene.
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Affiliation(s)
- Yinglan Li
- Institute of Biopharmaceutical Research, Liaocheng University, Liaocheng, Shandong 252059, People's Republic of China
| | - Jie Xu
- Institute of Biopharmaceutical Research, Liaocheng University, Liaocheng, Shandong 252059, People's Republic of China
| | - Qingran Guan
- Institute of Biopharmaceutical Research, Liaocheng University, Liaocheng, Shandong 252059, People's Republic of China
| | - Huaizhen Zhang
- School of Geography and Environment, Liaocheng University, Liaocheng, Shandong 252059, People's Republic of China
| | - Zhuang Ding
- Institute of Biopharmaceutical Research, Liaocheng University, Liaocheng, Shandong 252059, People's Republic of China
| | - Qingpeng Wang
- Institute of Biopharmaceutical Research, Liaocheng University, Liaocheng, Shandong 252059, People's Republic of China
| | - Zhengping Wang
- Institute of Biopharmaceutical Research, Liaocheng University, Liaocheng, Shandong 252059, People's Republic of China
| | - Jun Han
- Institute of Biopharmaceutical Research, Liaocheng University, Liaocheng, Shandong 252059, People's Republic of China
| | - Min Liu
- Institute of Biopharmaceutical Research, Liaocheng University, Liaocheng, Shandong 252059, People's Republic of China.
| | - Yanna Zhao
- Institute of Biopharmaceutical Research, Liaocheng University, Liaocheng, Shandong 252059, People's Republic of China.
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3
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Chen S, Zhang Y, Chen Q, Zhang C, Zhang M, Yu K. Precursor Compound-Assisted Formation of CdS Magic-Size Clusters in Aqueous Solutions. Inorg Chem 2023; 62:18290-18298. [PMID: 37883791 DOI: 10.1021/acs.inorgchem.3c02980] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2023]
Abstract
Investigations of the formation pathway of semiconductor magic-size clusters (MSCs) in aqueous solutions are quite limited. Here, we present our understanding about a precursor compound (PC)-assisted formation pathway of aqueous-phase CdS MSCs exhibiting a characteristic absorption peak at about 360 nm (MSC-360). The reaction uses CdCl2 as the Cd source and thioglycolic acid (TGA) as both the S source and ligand in alkaline aqueous solutions. The mixture remains absorption featureless upon incubation at room temperature but with MSC-360 absorption observed upon adding butylamine. The longer the incubation period of the aqueous solution, the more MSC-360 forms after adding butylamine. We propose that Cd-TGA complexes form first, in which the TGA moieties then decompose partially to form PC of MSC-360 (PC-360) that cannot be observed in the optical absorption spectrum. The resulting PC-360 transforms to MSC-360 via quasi-isomerization in the presence of butylamine. The present study provides an in-depth understanding about the formation of aqueous-phase MSCs.
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Affiliation(s)
- Shuo Chen
- Engineering Research Center in Biomaterials, Sichuan University, Chengdu 610065, China
| | - Yu Zhang
- School of Chemical Engineering, Sichuan University, Chengdu 610065, China
| | - Qingyuan Chen
- Institute of Atomic and Molecular Physics, Sichuan University, Chengdu 610065, China
| | - Chunchun Zhang
- Analytical & Testing Center, Sichuan University, Chengdu 610065, China
| | - Meng Zhang
- Institute of Atomic and Molecular Physics, Sichuan University, Chengdu 610065, China
| | - Kui Yu
- Engineering Research Center in Biomaterials, Sichuan University, Chengdu 610065, China
- Institute of Atomic and Molecular Physics, Sichuan University, Chengdu 610065, China
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4
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Chen Z, Manian A, Dong Y, Russo SP, Mulvaney P. Ligand and solvent effects on the absorption spectra of CdS magic-sized clusters. J Chem Phys 2023; 158:2887770. [PMID: 37129143 DOI: 10.1063/5.0147609] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2023] [Accepted: 04/17/2023] [Indexed: 05/03/2023] Open
Abstract
The absorption spectra of congenetic wurtzite (WZ) and zincblende (ZB) CdS magic-sized clusters are investigated. We demonstrate that the exciton peak positions can be tuned by up to 500 meV by varying the strong coupling between X-type ligands and the semiconductor cores, while the addition of L-type ligands primarily affects cluster midgap states. When Z-type ligands are displaced by L-type ligands, red shifts in the absorption spectra are observed, despite the fact there is a small decrease in cluster size. Density functional theory calculations are used to explain these findings and they reveal the importance of Cd and S dangling bonds on the midgap states during the Z- to L-type ligand exchange process. Overall, ZB CdS clusters show higher chemical stability than WZ clusters but their optical properties exhibit greater sensitivity to the solvent. Conversely, WZ CdS clusters are not stable in a Lewis base-rich environment, resulting in various changes in their spectra. Our findings enable researchers to select capping ligands that modulate the optical properties of semiconductor clusters while maintaining precise control over their solvent interactions.
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Affiliation(s)
- Zifei Chen
- ARC Centre of Excellence in Exciton Science, School of Chemistry, The University of Melbourne, Parkville, VIC 3010, Australia
| | - Anjay Manian
- ARC Centre of Excellence in Exciton Science, School of Science, RMIT University, Melbourne 3000, Australia
| | - Yihan Dong
- ARC Centre of Excellence in Exciton Science, School of Chemistry, The University of Melbourne, Parkville, VIC 3010, Australia
| | - Salvy P Russo
- ARC Centre of Excellence in Exciton Science, School of Science, RMIT University, Melbourne 3000, Australia
| | - Paul Mulvaney
- ARC Centre of Excellence in Exciton Science, School of Chemistry, The University of Melbourne, Parkville, VIC 3010, Australia
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5
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Li Y, Zhang M, He L, Rowell N, Kreouzis T, Zhang C, Wang S, Luan C, Chen X, Zhang S, Yu K. Manipulating Reaction Intermediates to Aqueous-Phase ZnSe Magic-Size Clusters and Quantum Dots at Room Temperature. Angew Chem Int Ed Engl 2022; 61:e202209615. [PMID: 35909255 DOI: 10.1002/anie.202209615] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2022] [Indexed: 02/05/2023]
Abstract
It is not resolved which model describes better the aqueous-phase nucleation and growth of semiconductor quantum dots (QDs), the classical one-step one or the nonclassical multi-step one. Here, we design a room-temperature reaction to trap reaction intermediates in the prenucleation stage of ZnSe QDs (as a model system). We show that the trapped intermediate can transform to magic-size clusters (MSCs) via intra-molecular reorganization and can fragment to enable the growth of QDs. The MSCs exhibit a sharp optical absorption peaking at 299 nm, labelled MSC-299. The intermediate, the precursor compound (PC-299) of MSC-299, is optically transparent at 299 nm and to longer wavelengths. This intermediate forms in various Zn and Se reaction systems. The present study provides unambiguous evidence that the nonclassical and classical pathways are both necessary to explain the nucleation and growth of aqueous-phase QDs, with the former pathway favored more by high reaction concentrations.
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Affiliation(s)
- Yang Li
- Sichuan University, College of Biomedical Engineering, CHINA
| | - Meng Zhang
- Sichuan University, School of Physical and Chemical Sciences, CHINA
| | - Li He
- Sichuan University, College of Biomedical Engineering, CHINA
| | - Nelson Rowell
- National Research Council Canada, Metrology Research Centre, CANADA
| | - Theo Kreouzis
- Queen Mary University of London, School of Physical and Chemical Sciences, UNITED KINGDOM
| | | | - Shanlin Wang
- Sichuan University, Analytical & Testing Center, CHINA
| | - Chaoran Luan
- West China School of Medicine: Sichuan University West China Hospital, Laboratory of Ethnopharmacology, CHINA
| | - Xiaoqin Chen
- Sichuan University, College of Biomedical Engineering, CHINA
| | - Sijie Zhang
- Guizhou University of Engineering Science, , CHINA
| | - Kui Yu
- Sichuan University, National Engineering Research Center for Biomaterials, No. 24, South Section, First Ring Road, Chengdu, 610065, Chengdu, CHINA
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6
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Li Y, Zhang M, He L, Rowell N, Kreouzis T, Zhang C, Wang S, Luan C, Chen X, Zhang S, Yu K. Manipulating Reaction Intermediates to Aqueous‐Phase ZnSe Magic‐Size Clusters and Quantum Dots at Room Temperature. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202209615] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Affiliation(s)
- Yang Li
- Sichuan University College of Biomedical Engineering CHINA
| | - Meng Zhang
- Sichuan University School of Physical and Chemical Sciences CHINA
| | - Li He
- Sichuan University College of Biomedical Engineering CHINA
| | - Nelson Rowell
- National Research Council Canada Metrology Research Centre CANADA
| | - Theo Kreouzis
- Queen Mary University of London School of Physical and Chemical Sciences UNITED KINGDOM
| | | | - Shanlin Wang
- Sichuan University Analytical & Testing Center CHINA
| | - Chaoran Luan
- West China School of Medicine: Sichuan University West China Hospital Laboratory of Ethnopharmacology CHINA
| | - Xiaoqin Chen
- Sichuan University College of Biomedical Engineering CHINA
| | - Sijie Zhang
- Guizhou University of Engineering Science CHINA
| | - Kui Yu
- Sichuan University National Engineering Research Center for Biomaterials No. 24, South Section, First Ring Road, Chengdu 610065 Chengdu CHINA
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7
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Luan C, Shen Q, Rowell N, Zhang M, Chen X, Huang W, Yu K. A Real‐Time In‐situ Demonstration of Direct and Indirect Transformation Pathways in CdTe Magic‐size Clusters at Room Temperature. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202205784] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Affiliation(s)
- Chaoran Luan
- Sichuan University Laboratory of Ethnopharmacology, West China School of Medicine, West China Hospital CHINA
| | - Qiu Shen
- Sichuan University National Engineering Research Center for Biomaterials, College of Biomedical Engineering CHINA
| | - Nelson Rowell
- National Research Council Canada Metrology Research Centre CANADA
| | - Meng Zhang
- Sichuan University Institute of Atomic and Molecular Physics CHINA
| | - Xiaoqin Chen
- Sichuan University National Engineering Research Center for Biomaterials, College of Biomedical Engineering CHINA
| | - Wen Huang
- Sichuan University Laboratory of Ethnopharmacology, West China School of Medicine, West China Hospital CHINA
| | - Kui Yu
- Sichuan University National Engineering Research Center for Biomaterials No. 24, South Section, First Ring Road, Chengdu 610065 Chengdu CHINA
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8
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Luan C, Shen Q, Rowell N, Zhang M, Chen X, Huang W, Yu K. A Real-Time In Situ Demonstration of Direct and Indirect Transformation Pathways in CdTe Magic-Size Clusters at Room Temperature. Angew Chem Int Ed Engl 2022; 61:e202205784. [PMID: 35794715 DOI: 10.1002/anie.202205784] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2022] [Indexed: 02/05/2023]
Abstract
The transformations of colloidal semiconductor magic-size clusters (MSCs) are expected to occur with only discrete, step-wise redshifts in optical absorption. Here, we challenge this assumption presenting a novel, conceptually different transformation, for which the redshift is continuous. In the room-temperature transformation from CdTe MSC-448 to MSC-488 (designated by the peak wavelengths in nanometer), the redshift of absorption monitored in situ displays distinctly continuous and/or step-wise behavior. Based on conclusive evidence provided by real-time experiments, the former transformation is apparently direct and intra-cluster with a relatively large energy barrier. The latter transformation is indirect and assisted by MSC precursor compounds (PCs). The former transformation follows the latter often, being predominant at a relatively high temperature. The present findings encourage a reconsideration of the absorption redshift reported previously for transformations of binary II-VI MSCs, together with the pathway associated without the increase of cluster mass.
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Affiliation(s)
- Chaoran Luan
- Laboratory of Ethnopharmacology, Tissue-orientated Property of Chinese Medicine Key Laboratory of Sichuan Province, West China School of Medicine, West China Hospital, Sichuan University, Chengdu, Sichuan, 610065, P. R. China
| | - Qiu Shen
- National Engineering Research Center for Biomaterials, College of Biomedical Engineering, Sichuan University, Chengdu, Sichuan, 610065, P. R. China
| | - Nelson Rowell
- Metrology Research Centre, National Research Council Canada, Ontario, K1A 0R6, Canada
| | - Meng Zhang
- Institute of Atomic and Molecular Physics, Sichuan University, Chengdu, Sichuan, 610065, P. R. China
| | - Xiaoqin Chen
- National Engineering Research Center for Biomaterials, College of Biomedical Engineering, Sichuan University, Chengdu, Sichuan, 610065, P. R. China
| | - Wen Huang
- Laboratory of Ethnopharmacology, Tissue-orientated Property of Chinese Medicine Key Laboratory of Sichuan Province, West China School of Medicine, West China Hospital, Sichuan University, Chengdu, Sichuan, 610065, P. R. China
| | - Kui Yu
- National Engineering Research Center for Biomaterials, College of Biomedical Engineering, Sichuan University, Chengdu, Sichuan, 610065, P. R. China.,Institute of Atomic and Molecular Physics, Sichuan University, Chengdu, Sichuan, 610065, P. R. China
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9
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Li S, Gong X, Li Z, Yu M, Chen Y, Yu H, Wang S, Shao H, Dou M, Cheng Y. Interfacial Nucleation Mechanism of Water-Soluble Ag-In-S Quantum Dots at Room Temperature and Their Visible Light Catalytic Performance. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2022; 38:4692-4701. [PMID: 35385285 DOI: 10.1021/acs.langmuir.2c00236] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
A novel interfacial reaction nucleation mechanism for the preparation of water-soluble Ag-In-S quantum dots (AIS QDs) was proposed in which interfacial acid regulates the concentration of hydroxide ions outside the complex and sulfur sources attack cations at the interface of the complex, covalent bonds between cations and sulfur sources are formed at the interface of the complex, and the nucleation and growth of crystals is finished at room temperature. By bypassing the heating process normally necessary for crystal nucleation and growth, AIS QDs can be produced on a large scale under simple, mild conditions. At the same time, the characteristics of this mechanism enable AIS QDs to be directly synthesized in an organic pollutant solution. This study represents a significant advance in the mechanism of crystal synthesis and contributes to the photocatalytic decomposition of organic pollutants from theory to practice.
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Affiliation(s)
- Shenjie Li
- School of Chemistry and Chemical Engineering, Hefei University of Technology, Hefei, Anhui 230009, People's Republic of China
| | - Xiaoyu Gong
- School of Chemistry and Chemical Engineering, Hefei University of Technology, Hefei, Anhui 230009, People's Republic of China
| | - Zhiqiang Li
- School of Chemistry and Chemical Engineering, Hefei University of Technology, Hefei, Anhui 230009, People's Republic of China
| | - Minghui Yu
- School of Chemistry and Chemical Engineering, Hefei University of Technology, Hefei, Anhui 230009, People's Republic of China
| | - Yanyan Chen
- School of Chemistry and Chemical Engineering, Hefei University of Technology, Hefei, Anhui 230009, People's Republic of China
| | - Hao Yu
- School of Chemistry and Chemical Engineering, Hefei University of Technology, Hefei, Anhui 230009, People's Republic of China
| | - Shuang Wang
- School of Chemistry and Chemical Engineering, Hefei University of Technology, Hefei, Anhui 230009, People's Republic of China
| | - Hongyu Shao
- School of Chemistry and Chemical Engineering, Hefei University of Technology, Hefei, Anhui 230009, People's Republic of China
| | - Minghao Dou
- School of Chemistry and Chemical Engineering, Hefei University of Technology, Hefei, Anhui 230009, People's Republic of China
| | - Yuye Cheng
- School of Chemistry and Chemical Engineering, Hefei University of Technology, Hefei, Anhui 230009, People's Republic of China
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10
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Mashiach R, Weissman H, Avram L, Houben L, Diskin-Posner Y, Arunachalam V, Leskes M, Rybtchinski B, Bar-Shir A. Cation-Ligand Complexation Mediates the Temporal Evolution of Colloidal Fluoride Nanocrystals through Transient Aggregation. NANO LETTERS 2021; 21:9916-9921. [PMID: 34813333 PMCID: PMC8662719 DOI: 10.1021/acs.nanolett.1c03131] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/13/2021] [Revised: 11/12/2021] [Indexed: 06/13/2023]
Abstract
Colloidal inorganic nanofluorides have aroused great interest for various applications with their development greatly accelerated thanks to advanced synthetic approaches. Nevertheless, understanding their colloidal evolution and the factors that affect their dispersion could improve the ability to rationally design them. Here, using a multimodal in situ approach that combines DLS, NMR, and cryogenic-TEM, we elucidate the formation dynamics of nanofluorides in water through a transient aggregative phase. Specifically, we demonstrate that ligand-cation interactions mediate a transient aggregation of as-formed CaF2 nanocrystals (NCs) which governs the kinetics of the colloids' evolution. These observations shed light on key stages through which CaF2 NCs are dispersed in water, highlighting fundamental aspects of nanofluorides formation mechanisms. Our findings emphasize the roles of ligands in NCs' synthesis beyond their function as surfactants, including their ability to mediate colloidal evolution by complexing cationic precursors, and should be considered in the design of other types of NCs.
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Affiliation(s)
- Reut Mashiach
- Department
of Molecular Chemistry and Material Science, Weizmann Institute of Science, Rehovot 7610001, Israel
| | - Haim Weissman
- Department
of Molecular Chemistry and Material Science, Weizmann Institute of Science, Rehovot 7610001, Israel
| | - Liat Avram
- Department
of Chemical Research Support, Weizmann Institute
of Science, Rehovot 7610001, Israel
| | - Lothar Houben
- Department
of Chemical Research Support, Weizmann Institute
of Science, Rehovot 7610001, Israel
| | - Yael Diskin-Posner
- Department
of Chemical Research Support, Weizmann Institute
of Science, Rehovot 7610001, Israel
| | - Vaishali Arunachalam
- Department
of Molecular Chemistry and Material Science, Weizmann Institute of Science, Rehovot 7610001, Israel
| | - Michal Leskes
- Department
of Molecular Chemistry and Material Science, Weizmann Institute of Science, Rehovot 7610001, Israel
| | - Boris Rybtchinski
- Department
of Molecular Chemistry and Material Science, Weizmann Institute of Science, Rehovot 7610001, Israel
| | - Amnon Bar-Shir
- Department
of Molecular Chemistry and Material Science, Weizmann Institute of Science, Rehovot 7610001, Israel
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11
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Synergetic effect of the surface ligand and SiO 2 driven photoluminescence stabilization of the CH 3NH 3PbBr 3 perovskite magic-sized clusters. Sci Rep 2021; 11:22211. [PMID: 34782669 PMCID: PMC8593060 DOI: 10.1038/s41598-021-01560-4] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2021] [Accepted: 10/29/2021] [Indexed: 11/21/2022] Open
Abstract
Zero-dimensional Perovskite Magic-size Clusters play crucial roles in understanding and controlling nucleation and growth of semiconductor nanoparticles. However, their metastability behavior is a critical hindrance for reliable characterizations. Here, we report the first demonstration of using an excess amount of surface ligand and SiO2 as novel passivation for synthesizing the magic-sized clusters (MSCs) by the Ligand-assisted reprecipitation method. A synergetic effect between an excessed surface ligand and SiO2 inhibits the protonation and deprotonation reaction between amine-based and acid-based ligand, leading to enhanced PL stability. The obtained CH3NH3PbBr3 PMSCs/SiO2 retain 70% of its initial emission intensity in ambient conditions for 20 days. This passivation approach opens an entirely new avenue for the reliable characterizations of CH3NH3PbBr3 PMSCs, which will significantly broaden their application for understanding and controlling nucleation and growth of semiconductor nanoparticles.
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12
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Zhu J, Cao Z, Zhu Y, Rowell N, Li Y, Wang S, Zhang C, Jiang G, Zhang M, Zeng J, Yu K. Transformation Pathway from CdSe Magic‐Size Clusters with Absorption Doublets at 373/393 nm to Clusters at 434/460 nm. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202104986] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Affiliation(s)
- Jinming Zhu
- Institute of Atomic and Molecular Physics Sichuan University Chengdu Sichuan 610065 P. R. China
| | - Zhaopeng Cao
- Shanghai Institute of Applied Physics Chinese Academy of Sciences Shanghai 201800 P. R. China
- School of Physical Science and Technology ShanghaiTech University Shanghai 201210 P. R. China
- University of Chinese Academy of Sciences Beijing 100049 P. R. China
| | - Yongcheng Zhu
- Institute of Atomic and Molecular Physics Sichuan University Chengdu Sichuan 610065 P. R. China
| | - Nelson Rowell
- Metrology Research Centre National Research Council Canada Ottawa Ontario K1A 0R6 Canada
| | - Yan Li
- Shanghai Institute of Applied Physics Chinese Academy of Sciences Shanghai 201800 P. R. China
- School of Physical Science and Technology ShanghaiTech University Shanghai 201210 P. R. China
- University of Chinese Academy of Sciences Beijing 100049 P. R. China
| | - Shanling Wang
- Analytical & Testing Center Sichuan University Chengdu Sichuan 610065 P. R. China
| | - Chunchun Zhang
- Analytical & Testing Center Sichuan University Chengdu Sichuan 610065 P. R. China
| | - Gang Jiang
- Institute of Atomic and Molecular Physics Sichuan University Chengdu Sichuan 610065 P. R. China
| | - Meng Zhang
- Institute of Atomic and Molecular Physics Sichuan University Chengdu Sichuan 610065 P. R. China
| | - Jianrong Zeng
- Shanghai Institute of Applied Physics Chinese Academy of Sciences Shanghai 201800 P. R. China
- Shanghai Synchrotron Radiation Facility Shanghai Advanced Research Institute Chinese Academy of Sciences Shanghai 201204 P. R. China
| | - Kui Yu
- Institute of Atomic and Molecular Physics Sichuan University Chengdu Sichuan 610065 P. R. China
- Engineering Research Center in Biomaterials Sichuan University Chengdu Sichuan 610065 P. R. China
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13
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Zhu J, Cao Z, Zhu Y, Rowell N, Li Y, Wang S, Zhang C, Jiang G, Zhang M, Zeng J, Yu K. Transformation Pathway from CdSe Magic-Size Clusters with Absorption Doublets at 373/393 nm to Clusters at 434/460 nm. Angew Chem Int Ed Engl 2021; 60:20358-20365. [PMID: 33960093 DOI: 10.1002/anie.202104986] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2021] [Indexed: 12/13/2022]
Abstract
Divergent interpretations have appeared in the literature regarding the structural nature and evolutionary behavior for photoluminescent CdSe nanospecies with sharp doublets in optical absorption. We report a comprehensive description of the transformation pathway from one CdSe nanospecies displaying an absorption doublet at 373/393 nm to another species with a doublet at 433/460 nm. These two nanospecies are zero-dimensional (0D) magic-size clusters (MSCs) with 3D quantum confinement, and are labeled dMSC-393 and dMSC-460, respectively. Synchrotron-based small-angle X-ray scattering (SAXS) returns a radius of gyration of 0.92 nm for dMSC-393 and 1.14 nm for dMSC-460, and indicates that both types are disc shaped with the exponent of the SAXS form factor equal to 2.1. The MSCs develop from their unique counterpart precursor compounds (PCs), which are labeled PC-393 and PC-460, respectively. For the dMSC-393 to dMSC-460 transformation, the proposed PC-enabled pathway is comprised of three key steps, dMSC-393 to PC-393 (Step 1), PC-393 to PC-460 (Step 2 involving monomer addition), and PC-460 to dMSC-460 (Step 3). The present study provides a framework for understanding the PC-based evolution of MSCs and how PCs enable transformations between MSCs.
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Affiliation(s)
- Jinming Zhu
- Institute of Atomic and Molecular Physics, Sichuan University, Chengdu, Sichuan, 610065, P. R. China
| | - Zhaopeng Cao
- Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai, 201800, P. R. China.,School of Physical Science and Technology, ShanghaiTech University, Shanghai, 201210, P. R. China.,University of Chinese Academy of Sciences, Beijing, 100049, P. R. China
| | - Yongcheng Zhu
- Institute of Atomic and Molecular Physics, Sichuan University, Chengdu, Sichuan, 610065, P. R. China
| | - Nelson Rowell
- Metrology Research Centre, National Research Council Canada, Ottawa, Ontario, K1A 0R6, Canada
| | - Yan Li
- Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai, 201800, P. R. China.,School of Physical Science and Technology, ShanghaiTech University, Shanghai, 201210, P. R. China.,University of Chinese Academy of Sciences, Beijing, 100049, P. R. China
| | - Shanling Wang
- Analytical & Testing Center, Sichuan University, Chengdu, Sichuan, 610065, P. R. China
| | - Chunchun Zhang
- Analytical & Testing Center, Sichuan University, Chengdu, Sichuan, 610065, P. R. China
| | - Gang Jiang
- Institute of Atomic and Molecular Physics, Sichuan University, Chengdu, Sichuan, 610065, P. R. China
| | - Meng Zhang
- Institute of Atomic and Molecular Physics, Sichuan University, Chengdu, Sichuan, 610065, P. R. China
| | - Jianrong Zeng
- Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai, 201800, P. R. China.,Shanghai Synchrotron Radiation Facility, Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai, 201204, P. R. China
| | - Kui Yu
- Institute of Atomic and Molecular Physics, Sichuan University, Chengdu, Sichuan, 610065, P. R. China.,Engineering Research Center in Biomaterials, Sichuan University, Chengdu, Sichuan, 610065, P. R. China
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14
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He L, Luan C, Rowell N, Zhang M, Chen X, Yu K. Transformations Among Colloidal Semiconductor Magic-Size Clusters. Acc Chem Res 2021; 54:776-786. [PMID: 33533599 DOI: 10.1021/acs.accounts.0c00702] [Citation(s) in RCA: 26] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
A knowledge of colloidal semiconductor magic-size clusters (MSCs) is essential for understanding how fundamental properties evolve during transformations from individual molecules to semiconductor quantum dots (QDs). Compared to QDs, MSCs display much narrower optical absorption bands; the higher cluster stability gives rise to a narrower size distribution. During the production of binary QDs such as II-VI metal (M) chalcogenide (E) ones, binary ME MSCs observed were interpreted as side products and/or the nuclei of QDs. Prior to the current development of our two-step approach followed by our two-pathway model, it had been extremely challenging to synthesize MSCs as a unique product without the nucleation and growth of QDs. With the two-step approach, we have demonstrated that MSCs can be readily engineered as a sole product at room temperature from a prenucleation stage sample, also called an induction period (IP) sample. It is important that we were able to discover that the evolution of the MSCs follows first-order reaction kinetics behavior. Accordingly, we proposed that a new type of compound, termed as "precursor compounds" (PCs) of MSCs, was produced in an IP sample. Such PCs are optically transparent at the absorption peak positions of their MSC counterparts as well as to longer wavelengths. It is thought that quasi isomerization of a single PC results in the development of one MSC.In this Account, we provide an overview of our latest advances regarding the transformations among binary CdE MSCs as well as from binary CdTe to ternary CdTeSe MSCs. Optical absorption spectroscopy has been employed to study these transformations, all of which display well-defined isosbestic points. We have proposed that these MSC to MSC transformations occur via their corresponding PCs, also called immediate PCs. It is reasonable that the as-synthesized PC (in an IP sample) and the immediate PC (in an incubated and/or diluted sample) probably have different configurations. A transformation between two PCs may involve an intermolecular reaction, with either first-order reaction kinetics or a more complicated time profile. A transformation between one immediate PC and its counterpart MSC may contain an intramolecular reaction. The present Account, which addresses the PC-enabled MSC transformations with isosbestic points probed by optical absorption spectroscopy, calls for more experimental and theoretical attention to understand these magic species and their transformation processes more precisely.
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Affiliation(s)
- Li He
- Engineering Research Center in Biomaterials, Sichuan University, Chengdu, Sichuan 610065, People’s Republic of China
| | - Chaoran Luan
- Department of Ophthalmology, West China School of Medicine, West China Hospital, Sichuan University, Chengdu, Sichuan 610065, People’s Republic of China
| | - Nelson Rowell
- Metrology Research Centre, National Research Council Canada, Ottawa, Ontario K1A 0R6, Canada
| | - Meng Zhang
- Institute of Atomic and Molecular Physics, Sichuan University, Chengdu, Sichuan 610065, People’s Republic of China
| | - Xiaoqin Chen
- Engineering Research Center in Biomaterials, Sichuan University, Chengdu, Sichuan 610065, People’s Republic of China
| | - Kui Yu
- Engineering Research Center in Biomaterials, Sichuan University, Chengdu, Sichuan 610065, People’s Republic of China
- Institute of Atomic and Molecular Physics, Sichuan University, Chengdu, Sichuan 610065, People’s Republic of China
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