Gering-toxische Quantenpunkte mit modularer Lichtemission im Infrarot-Bereich
Zusammenfassung der Projektergebnisse
In the framework of the project, a variety of low-toxic nanomaterials based on copper chalcogenides have been synthesized using wet-chemical colloidal approach. The developed methods relying on cation exchange reactions allow for a precise control over the synthesis conditions. Different multicomponent Cu-In-S (Cu-In-Se)-based nanocrystals active in the near infrared region of the spectrum with shapes from spherical particles to two-dimensional nanoplatelets or nanosheets were synthesized. This work not only provides new insights into the mechanism of cation exchange reactions at the nanoscale, but also offers a novel methodology for the synthesis of a wide variety of semiconductor nanomaterials with well-controlled dimensions, structure, and composition. Playing with the main reaction parameters, such as time, temperature, choice of precursors, ligands and solvents, gives a powerful toolkit to finely tune the properties of the resulting nanostructures. These reactions may provide an endless number of possible structures depending on i) the choice of the guest ions, ii) the specific combination of different guest ions, and iii) the completeness of the ion exchange. In addition to purely fundamental findings, the project demonstrated a well-defined application potential of the materials synthesized. Plasmonic copper selenide nanocrystals were processed into thin uniform films possessing high electrical conductivity and were tested in vapor sensing. Using similar copper selenide nanocrystals, a prototype of an electrochromic device has been fabricated. This device can reversibly change its transmittance in the near infrared region upon changing applied potential from positive to negative. Fluorescent Cu-Zn-In-S-based quantum dots have been employed to build a prototype of a luminescent solar concentrator. In this device, quantum dots embedded in a transparent polymer plate transmit solar light to its edges where solar cells are placed, representing a concept of a photovoltaic window.
Projektbezogene Publikationen (Auswahl)
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Near-Infrared Cu–In–Se-Based Colloidal Nanocrystals via Cation Exchange. Chem. Mater. 2018, 30, 2607-2617
Lox, J. F. L.; Dang, Z.; Dzhagan, V. M.; Spittel, D.; Martín-García, B.; Moreels, I.; Zahn, D. R. T.; Lesnyak, V.
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Brightly Luminescent Cu-Zn-In-S/ZnS Core/Shell Quantum Dots in Salt Matrices. Z. Phys. Chem. 2019, 233, 23-40
Lox J., F. L.; Eichler, F.; Erdem, T.; Adam, M.; Gaponik, N.; Demir H. V.; Lesnyak, V.; Eychmüller, A.
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Colloidal Cu–Zn–In–S-Based Disk-Shaped Nanocookies. Chem. Mater. 2019, 31, 2873-2883
Lox, J. F. L.; Dang, Z.; Lê Anh, M.; Hollinger, E.; Lesnyak, V.
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Highly Conductive Copper Selenide Nanocrystal Thin Films for Advanced Electronics. ACS Appl. Electron. Mater. 2019, 1, 1560-1569
Samadi Khoshkhoo, M.; Lox, J. F. L.; Koitzsch, A.; Lesny, H.; Joseph, Y.; Lesnyak, V.; Eychmüller, A.
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Cation Exchange on Colloidal Copper Selenide Nanosheets: A Route to Two-Dimensional Metal Selenide Nanomaterials. J. Mater. Chem. C 2021, 9, 16523-16535
Shamraienko, V.; Spittel, D.; Hübner, R.; Samadi Khoshkhoo, M.; Weiß, N.; Georgi, M.; Borchert, K. B. L.; Schwarz, D.; Lesnyak, V.; Eychmüller, A.
