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Atomically-thin population of colloidal CdSe nanoplatelets: growth of rolled-up nanosheets and strong circular dichroism induced by ligand exchangeстатья
Статья опубликована в высокорейтинговом журнале
Информация о цитировании статьи получена из
Web of Science,
Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 15 апреля 2020 г.
- Авторы: Kurtina Daria A., Garshev Alexey V., Vasil'eva Irina S., Shubin Vladimir V., Gaskov Alexander M., Vasiliev Roman B.
- Журнал: Chemistry of Materials
- Том: 31
- Номер: 23
- Год издания: 2019
- Издательство: American Chemical Society
- Местоположение издательства: United States
- Первая страница: 9652
- Последняя страница: 9663
- DOI: 10.1021/acs.chemmater.9b02927
- Аннотация: Colloidal two-dimensional cadmium chalcogenides nanoplatelets have recently emerged as a class of semiconductor nanoparticles with the narrowest emission and absorption excitonic bands that are of interest for optical applications. Here, we have developed a synthesis protocol for 2.5 monolayers (ML) thick CdSe nanosheets as a single population. We found that a two-step synthesis in the presence of water promoted the growth of atomically-thin nanosheets with high structural and morphological perfection. Using seeded-growth technique, we extended the lateral size of nanosheets up to 400 nm, which led to the formation of multiwall rolled-up nanostructures. Ligand exchange of native oleic acid, attached to Cd-rich (001) planes, with achiral thioglycolic acid and chiral N-acetylcysteine retains a scroll-like morphology of nanosheets, in contrast to thicker 3.5 ML population. A reorientation from the [110] to [100] folding direction was found during the change from an achiral to a chiral ligand. In the case of ligand exchange with chiral N-acetyl-L- or D-cysteine, we demonstrated that 2.5 ML CdSe nanosheets with 400 nm lateral size have circular dichroism with dissymmetry g-factor up to 3‧10-3. Strong circular dichroism found for colloidal CdSe nanosheets makes them a promising candidate for polarization-enabled applications, while the growth protocol of the thinnest CdSe nanosheets enriches the known synthesis methods of a set of CdSe nanoplatelet populations.
- Добавил в систему: Васильев Роман Борисович