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Zhang Jiatao's Team from BIT Published a Review of Nanocrystal Synthesis Methodologies in Cell's Flagship Journal Matter

release date :2020-03-18 09:11:00  |   [ close window ]ViewCount:

  Beijing Institute of Technology, Mar 6th, 2020: Recently, a research team from Beijing Institute of Technology(BIT)School of Chemistry and Chemical Engineering led by Dean Zhang Jiatao published a review paper in Matter, the flagship journal of materials science under Cell, titled “Cation/Anion Exchange Reactions towards the Syntheses of Upgraded Nanostructures: Principles and Applications”(Matter 2020, 2, 554-586). Based on the team's research achievements in the precise synthesis of II-VI group doping and heterogeneous nanocrystals by ion-exchange strategy and their applications, this paper introduces in detail the reaction mechanism, material synthesis progress, performance application and prospect of the ion exchange reaction for the synthesis of inorganic nanocrystals.

  The photoelectric properties regulation and application of inorganic colloidal nanocrystals due to their size, morphology and composition have been widely concerned by the scientific community. In the process of further functionalization, the heterostructure, doping of nanocrystals, and effective combination with size and morphology control have important scientific and application significance. Ion exchange reactions have gradually developed into effective strategies for synthesizing inorganic nanocrystals with controlled composition, interface, and morphology in recent years, and have important scientific and application values in the field of materials chemistry. For example, compared with traditional methods, deep-site-doped quantum dots prepared by reverse competitive cation exchange reactions can increase the fluorescence quantum yield and fluorescence lifetime of doped quantum dots; Ion exchange strategies can be implemented at the atomic level regulating the metal-semiconductor heterogeneous interface under large lattice mismatch is more conducive to the coupling of plasmons and excitons and the injection of hot electrons to achieve efficient photocatalytic hydrogen production. The composition regulation and heterovalent doping of the inorganic perovskite nanocrystals achieved through the ion exchange strategy can effectively achieve the adjustment of its fluorescence position and the improvement of its fluorescence stability, etc. Therefore, the ion exchange reaction has important application value for the synthesis of liquid-phase inorganic nanocrystals.

Figure 1 Preparation and properties of colloidal nanocrystals by ion exchange reaction

  Based on detailed literature research, the team reviewed the prospect of ion exchange strategies for the synthesis of inorganic nanocrystals in recent years, mainly including the following: (1) Research progress of ion exchange reaction mechanisms, including thermodynamic and kinetic studies, solvent formulation research. Among them, Professor Zhang Jiatao's team has in-depth research in recent years on the effects of ligands and solvents on the mechanism of reverse competitive ion exchange reactions and their application expansion (Angew. Chem. Int. Ed. 2015, 54, 3683-3687; Angew. Chem. Int. Ed 2019, 58, 1 – 7); (2) The research progress of ion exchange reaction strategy in precisely regulated preparation of inorganic colloidal nanocrystals including alloy state/doping quantum dots, heterogeneous nanocrystals, hollow nanocrystals, perovskite nanocrystals, two-dimensional nanocrystals, etc.  Among them, Professor Zhang Jiatao's team proposed a counter-competitive cation exchange reaction strategy and realized heterovalent doping at the depth position of group II-VI quantum dots, providing a new method and new material for effectively solving the problem of stable doping caused by self-cleaning effects (Adv Mater. 2015, 27, 2753–2761). Furthermore, the reverse-competitive cation exchange reaction strategy was used to realize the preparation of metal-single-crystal semiconductor hetero-nanocrystals in the water phase. While achieving a high crystallinity shell, it can effectively achieve its low-defect heterogeneous interface and applications (Nano Energy 2019 , 57, 57–65). Based on the synthesis of heterogeneous nanocrystals, the team teased a review of nanocrystal interface synthesis chemistry from the perspective of lattice mismatch (Chem. Rev. 2020, 120, 2123-2170); (3) Precise synthesis of nanocrystals by ion exchange reaction research progress in performance applications, including fluorescence regulation, photothermal performance, photocatalytic / photocatalytic performance research, electrochemical applications, etc. For example, Zhang Jiatao's research team and collaborators found that Ag-doped CdSe quantum dots have light-induced Ag+ to Ag2+ transition and the resulting light-induced magnetism (Nat. Nanotech. 2018, 13, 145-151). Single crystal core-shell nanocrystalline with clear heterogeneous interface prepared by cation exchange strategy in the photolysis of aquatic hydrogen (Nano Energy 2018, 48, 44-52; Adv. Energy Mater. 2019, 9, 1803889), near-infrared photoelectric detection (Nano Energy 2019, 57, 57 –65), photothermal therapy applications (Adv. Mater. 2016, 28, 3094–3101) and other fields have shown high performance advantages; (4) The prospect of ion exchange strategy includes the accurate preparation of complex micro-nano structures and the further realization of the regulation of atomic sites and surface strain.

  The above research results are supported by the platform of Beijing Municipal Key Laboratory of Structurally Controllable Advanced Functional Materials and Green Applications and Advanced Materials Experimental Center of the School of Materials Science and Engineering, supported by money from the National Natural Science Foundation of China (Grant No. 51702016, 51631001, 51872030, 21643003, 51501010) and the innovative talent support program of Scientific Research Institutes. Li Xinyuan (now a postdoc in Tsinghua University) and Ji Muwei (now an associate researcher in Shenzhen University), PhD graduates of School of Materials Science and Engineering, BIT, are co-first authors of the paper. Prof. Li Hongbo and Prof. Zhang Jiatao of BIT are the corresponding authors, and BIT is the first communication unit.


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News Source: School of Chemistry and Chemical Engineering
Editor: News Agency of BIT
Translator: Ni Nan, News Agency of BIT


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