Article
Chemistry, Multidisciplinary
Xue Bai, Finn Purcell-Milton, Yurii K. Gun'ko
Summary: Cu-Based quantum dots are being explored as a potential replacement for toxic Cd- or Pb-based QDs, with studies focusing on the impact of different reaction conditions on the resulting morphologies and optical properties. By carefully controlling the ZnS shell deposition, researchers have optimized the synthesis of CIZS/ZnS/ZnS QDs and produced highly fluorescent core/shell/shell heterostructured QDs with high PLQYs. Additionally, the successful creation of giant ZnS shell QDs opens up possibilities for further development in this area.
Article
Chemistry, Physical
Jiakuan Zhang, Chuyue Li, Jiongzhao Li, Xiaogang Peng
Summary: Size- and shape-controlled CdSe/ZnSe core/shell and CdSe/ZnSe/ZnS core/shell/shell nanocrystals with zinc-blende structure are synthesized. The ligand strain between the inorganic crystal surface and organic ligands plays a key role in ZnSe epitaxy. The lattice strain between the CdSe and ZnSe affects the photoluminescence of CdSe/ZnSe/ZnS core/shell/shell QDs.
CHEMISTRY OF MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Weishuo Xing, Shuang Zhang, Ruoting An, Wengang Bi, Chong Geng, Shu Xu
Summary: A low-temperature route using mixed amine ligands was developed for the synthesis of tetrapod CdSe/CdS QDs, simplifying the anisotropic growth of CdS on CdSe QDs. The amine ligands induce the orientation growth of cubic CdS arms on wurtzite CdSe QDs through a pyramid-shaped intermediate structure, allowing for growth control through a microfluidic reactor. This study paves the way for green and economic production of tetrapod CdSe/CdS QDs towards efficient light-emitting applications.
Article
Chemistry, Physical
Celine Rivaux, Tugce Akdas, Ranjana Yadav, Omar El-Dahshan, Davina Moodelly, Wai Li Ling, Dmitry Aldakov, Peter Reiss
Summary: Continuous flow synthesis of highly luminescent AIS/ZnS QDs was achieved with high PLQY values in short reaction times, by optimizing reaction parameters and favoring the formation of defect complexes through the addition of excess indium and low reaction temperatures. Structural disorder and the formation of ZnIn- antisite defects during ZnS shell growth contribute to the high efficiency of the QDs. The presented method allows for excellent reproducibility and scalability for large-scale production.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Optics
Xiaobo Hu, Yanqiao Xu, Jiancheng Wang, Jiaxin Ma, Lianjun Wang, Wan Jiang
Summary: High-quality CsPbBr3 nanocrystals were successfully synthesized using a modified ligand-assisted reprecipitation method. The effect of reaction parameters on the structure, morphology, and fluorescence properties was systematically examined. Increasing the Cs/Pb ratio and precursors concentration was found to enhance the crystal structure completeness and PL intensity. Furthermore, variable emission wavelength and wide color gamut were achieved by anion exchange process.
JOURNAL OF LUMINESCENCE
(2022)
Article
Chemistry, Physical
Aliaksandra Radchanka, Varvara Hrybouskaya, Andrey Iodchik, Alexander W. Achtstein, Mikhail Artemyev
Summary: In this study, the researchers found that by varying the surface charged groups on CdSe/ZnS QDs, the zeta-potential can be tuned to control the quantum yield of emission and the recombination dynamics. The presence of zwitterionic surface groups allows for pH tuning of the zeta-potential and quantum yield.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
Article
Chemistry, Physical
Ha Trang Nguyen, Thanh Thao Tran, Vishwa Bhatt, Manjeet Kumar, Ju-Hyung Yun
Summary: Hybrid nanostructures composed of quantum dots and metal nanoparticles have unique optical properties, and can be used to control photoluminescence in optoelectronic applications. By controlling the composition and size of the structure, the interaction between excitons and plasmon can be investigated, and the power conversion efficiency of silicon solar cells can be improved.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
Article
Engineering, Electrical & Electronic
Hong Li, Jinxu Jiao, Qi Ye, Zhixin Wu, Donglian Luo, Dehua Xiong
Summary: The successful synthesis of CdSe/ZnS core-shell QDs and the important effects of reaction time and oleic acid dosage on their optical properties were highlighted. Furthermore, highly efficient green QLEDs were fabricated using a rotary coating method on an ITO glass substrate.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2021)
Article
Chemistry, Inorganic & Nuclear
Donovan Thomas, Harold O. Lee, Kevin C. Santiago, Marvin Pelzer, Ayodeji Kuti, LaRico J. Treadwell, Messaoud Bahoura
Summary: In this study, europium-doped CdSe quantum dots were successfully synthesized using a one-pot microwave synthesis method. By varying microwave irradiation temperatures, hold times, and dopant concentration, the optical properties of CdSe quantum dots were tuned. UV-Vis spectroscopy and photoluminescence data show that structural incorporation of europium affects the optical properties of CdSe QDs.
DALTON TRANSACTIONS
(2021)
Article
Chemistry, Physical
Ja-Jung Koo, Kwang Hwan Jung, Kyungsu Park, Won Ja Min, Kyu-Sang Yu, Zee Hwan Kim, Jin-Kyu Lee
Summary: In this study, the interfacial structures of CdSe/ZnS QDs were investigated using TOF-MEIS. The results showed the existence of an alloyed layer at the interface between CdSe and ZnS in typical CdSe/ZnS QDs. The dissolution of CdSe seeds during the synthesis steps was identified as the cause of this interfacial alloying, and the ligand environment of the solvent was found to influence the shape of the interface.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
Article
Chemistry, Physical
E. Krishnan Vishnu, Anoop Ajaya Kumar Nair, K. George Thomas
Summary: The study investigates the photoluminescence fluctuations in CdSe QDs by varying core size and maintaining constant shell thickness. Increase in core size leads to enhanced detrapping rate and higher photoluminescence efficiency.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Review
Chemistry, Analytical
Fuqi Yao, Pengpeng Zhu, Junjie Chen, Suyang Li, Biao Sun, Yunfeng Li, Mingqiang Zou, Xiaohua Qi, Pei Liang, Qiang Chen
Summary: In recent years, the research on nanomaterials has been focused on their unique optical, chemical, and biological properties, attracting experts in the fields of catalysis, energy, biomedical testing, and biomedicine. Microfluidics, a paradigm of microscale control, provides an ideal platform for stable synthesis of nanomaterials through efficient mass and heat transfer, flexible blending of reactants, and precise control of reaction conditions. This article summarizes the microfluidic preparation of nanoparticles in the last 5 years, including microfluidic techniques and manipulation of fluids. It also demonstrates the ability of microfluidics to prepare different types of nanomaterials and presents cases of nanomaterials prepared under extreme conditions.
Article
Chemistry, Physical
Jiangzhi Zi, Yueqi Zhong, Zhao Li, Fan Wu, WeiWei Yang, Zichao Lian
Summary: Photoinduced carrier transfer pathways play a role in the optical and electronic properties of nanomaterials for photocatalytic H-2 evolution, while defects in semiconductor nanocrystals can enhance our understanding of photocatalytic mechanisms. CdSe/ZnS HNPLs with anomalous type-I hole transfer exhibit advantages in efficient charge separation and photocatalytic H-2 evolution, compared to type-II CdSe/ZnSe HNPLs and pristine CdSe NPLs. These results elucidate the role of defect-mediated carrier transfer in visible-light-driven photocatalytic H-2 evolution.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Chemistry, Multidisciplinary
Jingling Li, Haixin Zheng, Ziming Zheng, Haibo Rong, Zhidong Zeng, Hui Zeng
Summary: In this work, the crystalline structure of CdSe was successfully tuned by adjusting the precursor concentration and the dosage of tributyl phosphine. Core-shell quantum dots with different shell thicknesses were prepared by using TBP-assisted thermal-cycling technique. The addition of TBP improved the isotropic growth of the shell, resulting in high quantum yield and single-channel decay characteristic of CdSe/ZnS quantum dots. This study not only provides a facile synthesis route for controlling the core-shell structures and fluorescence properties of CdSe nanocrystals but also establishes a connection between ligand chemistry and crystal growth theory.
Article
Chemistry, Physical
Swati Khurana, Md Samim Hassan, Priyesh Yadav, Dibyajyoti Ghosh, Sameer Sapra
Summary: By utilizing bifunctional ligands, researchers synthesized MDNHs of CsPbBr3 nanocrystals and CdSe/CdS/ZnS core/shell/shell nanoplatelets, where 4-ATP exhibited faster charge transfer rate and the highest number of CSS NPLs around CsPbBr3 NCs in the MDNHs.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)