Aqueous synthesis of highly luminescent   AgInSe2/ZnS core/shell nanocrystals

Tran  Thi Thu Huong; Nguyen  Thi Hiep; Nguyen  Thu Loan; Le Van Long; Nguyen  Thanh Tung; Ung  Thi Dieu Thuy; Peter Reiss; Jae Yup Kim; Nguyen  Quang Liem

doi:10.15625/2525-2518/18628

Author affiliations

Authors

Tran Thi Thu Huong Institute of Materials Science, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Cau Giay, Ha Noi, Viet Nam https://orcid.org/0009-0008-3094-173X
Nguyen Thi Hiep Institute of Research and Development, Duy Tan University, Da Nang City, Viet Nam https://orcid.org/0000-0003-3089-7237
Nguyen Thu Loan Institute of Materials Science, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Cau Giay, Ha Noi, Viet Nam
Le Van Long Institute of Materials Science, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Cau Giay, Ha Noi, Viet Nam
Nguyen Thanh Tung Institute of Materials Science, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Cau Giay, Ha Noi, Viet Nam https://orcid.org/0000-0003-0232-7261
Ung Thi Dieu Thuy Institute of Materials Science, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Cau Giay, Ha Noi, Viet Nam https://orcid.org/0000-0003-0877-2753
Peter Reiss University of Grenoble Alpes, CEA, CNRS, IRIG-SyMMES, STEP, 38000 Grenoble, France https://orcid.org/0000-0002-9563-238X
Jae Yup Kim Department of Chemical Engineering, Dankook University, Yongin, 16890, Republic of Korea
Nguyen Quang Liem Institute of Materials Science, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Cau Giay, Ha Noi, Viet Nam

DOI:

https://doi.org/10.15625/2525-2518/18628

Keywords:

AgInSe2, AgInSe2/ZnS core/shell nanocrystals, water-soluble, photoluminescence

Abstract

Ternary I-III-VI chalcopyrite-type nanocrystals (NCs) range among the most important alternative materials to Cd-based NCs. Within this materials family, AgInSe₂ (AISe) presents a narrower bandgap than widely studied AgInS₂ (AIS), making it more suitable for numerous applications. At present, it remains a long-standing challenge to directly synthesize high-quality AISe core and AISe/ZnS core/shell NCs in aqueous solution at atmospheric pressure. In this work, we describe their synthesis using glutathione and citric acid as dual stabilizers. First, to form AISe core NCs, the Se precursor is injected into a solution containing the Ag and In complexes at 96 °C for 20 min. In the second step, the AISe/ZnS core/shell structure is created by growing the ZnS shell on the AISe NCs surface at 90 °C for 60 min. The synthesized AISe and AISe/ZnS core/shell NCs are characterized using X-ray diffraction, transmission electron microscopy, and UV-Vis absorption and photoluminescence for optical spectroscopies. After the growth of the ZnS shell, AISe/ZnS core/shell NCs exhibit higher photostability and emit intense luminescence at a wavelength of 680 nm with an impressive quantum yield (QY) of 30 %, which represents a threefold higher than the AISe core NCs. These properties make the aqueous soluble AISe/ZnS core/shell NCs favorable candidates for lighting, displays, and biological imaging applications.

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