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
Biochemical Research Methods
Olga A. Goryacheva, K. David Wegner, Aleksandr M. Sobolev, Ines Haeusler, Nikolai Gaponik, Irina Y. Goryacheva, Ute Resch-Genger
Summary: Light-emitting nanoparticles, known as quantum dots (QDs), have great potential for biosensing and bioimaging applications. However, their use in biological systems requires them to be water-dispersible without affecting their optical properties. In this study, researchers developed a new surface silanization method to preserve the optical properties of QDs and successfully prepared water-dispersible QDs.
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
(2022)
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
Engineering, Electrical & Electronic
Linhui Luo, Yun Lei, Peng Du, Yongqin Wang, Can Li, Beibei Du, Yuncui Wu
Summary: This study successfully synthesized core-shell quantum dots and investigated the effects of core-shell structure and N-GQDs on material performance. The results showed that both the core-shell structure and N-GQDs enhanced the photoelectric characteristics of the material.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2022)
Article
Chemistry, Physical
Jiajia Ning, Yuan Xiong, Stephen Kershaw, Andrey L. Rogach
Summary: The most efficient way to improve the stability and optical properties of nanocrystals is to grow shell around their cores. Different growth modes of the ZnS shell on ZnSe nanorods were observed depending on the crystal structure of the ZnSe core, leading to differences in photoluminescence quantum yield.
CHEMISTRY OF MATERIALS
(2021)
Article
Chemistry, Inorganic & Nuclear
Xinyuan Li, Mengyao Su, Yi-Chi Wang, Meng Xu, Minman Tong, Sarah J. Haigh, Jiatao Zhang
Summary: This study developed an efficient strategy to synthesize telluride core-shell colloidal semiconductor nanoparticles (CSNPs) with thin amorphous shells using aqueous cation exchange (ACE). The crystallinity and shell thickness of the CSNPs could be controlled by changing the synthesis temperature. The CSNPs synthesized at 60 degrees C exhibited the highest surface-enhanced Raman scattering activity.
INORGANIC CHEMISTRY
(2022)
Article
Nanoscience & Nanotechnology
Haorui Dong, Haiyan Zhao, Tongtong Xuan, Wenhao Bai, Tianyu Lin, Yixin Cai, Rong-Jun Xie
Summary: Lead halide perovskite nanocrystals with a perovskite/linear low-density polyethylene (perovskite/LLDPE) core/shell structure were successfully synthesized to achieve high photoluminescence quantum yield (PLQY) and high stability. The improved photoluminescence properties were attributed to the enhanced pressure effect and interaction between ligand and perovskite crystals. The resulting nanocrystals showed high stability under ambient conditions and against UV light, and were used to fabricate white-emitting Mini-LEDs with a super wide color gamut.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Physical
Paul Cavanaugh, Ilan Jen-La Plante, Christian Ippen, Ruiqing Ma, David F. Kelley, Anne Myers Kelley
Summary: Resonance Raman spectra and absolute cross sections of InP/ZnSe/ZnS core/shell/shell nanocrystals were obtained at different excitation wavelengths, revealing differences in phonon features attributed to various stoichiometries of the structures. The presence of excess indium in the ZnSe shell was found to influence the Raman intensities and frequency distributions, supporting previous assignments of hole trapping at indium defects in the shell.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Chemistry, Multidisciplinary
Muhammad Haroon Rashid, Ants Koel, Toomas Rang, Nadeem Nasir, Nadeem Sabir, Faheem Ameen, Abher Rasheed
Summary: Quantum-dot-based core/shell structures have gained significance recently due to their optical, optoelectronic, and magnetic attributes. This study developed novel Cu-doped CdS/ZnS shell structures to enhance photoluminescence properties. Experimental results showed that Cu-doped ZnS shells adopted the crystal structure of CdS, minimizing lattice mismatch and offering better passivation, resulting in increased photoluminescence.
Article
Chemistry, Physical
Patrick Y. Yee, Sarah Brittman, Nadeemullah A. Mahadik, Joseph G. Tischler, Rhonda M. Stroud, Alexander L. Efros, Peter C. Sercel, Janice E. Boercker
Summary: The study presents a method to deposit a PbS shell onto Cu2-xS nanocrystals, enhancing the optical properties of PbS nanocrystals. This structure shows potential for future applications.
CHEMISTRY OF MATERIALS
(2021)
Article
Chemistry, Physical
Ivan Marri, Simone Grillo, Michele Amato, Stefano Ossicini, Olivia Pulci
Summary: The electronic properties of hydrogenated, spherical SiGe and GeSi core-shell nanocrystals with different diameters are investigated. The results show that SiGe core-shell nanocrystals always exhibit a type II band-offset alignment, while small GeSi core-shell nanocrystals do not show this type of offset. Quantum confinement and strain drive the near-band-edge states to be mainly localized on Ge atoms in small GeSi nanocrystals. In larger GeSi nanocrystals, the formation of a type II offset can be engineered by adjusting both core and shell thickness. The factors determining the band-offset character at the Ge/Si interface are discussed in detail.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Multidisciplinary Sciences
Zezhou Li, Zhiheng Xie, Yao Zhang, Xilong Mu, Jisheng Xie, Hai-Jing Yin, Ya-Wen Zhang, Colin Ophus, Jihan Zhou
Summary: Deciphering the three-dimensional atomic structure of solid-solid interfaces in core-shell nanomaterials is key to understanding their catalytical, optical, and electronic properties. In this study, the authors used atomic resolution electron tomography to investigate the atomic structures of palladium-platinum core-shell nanoparticles at the single-atom level. They found that the core-shell interface is atomically diffuse with an average thickness of 4.2 angstrom, regardless of the particle's morphology or crystallographic texture. The high concentration of Pd in the diffusive interface is related to the dissolution of free Pd atoms from the Pd seeds, as confirmed by cryogenic electron microscopy.
NATURE COMMUNICATIONS
(2023)
Article
Chemistry, Physical
Andre Felipe Vale da Fonseca, Brener Rodrigo Carvalho Vale, Thais Adriany de Souza Carvalho, Jefferson Bettini, Arnaldo Cesar Pereira, Marco Antonio Schiavon
Summary: Perovskite nanocrystals (PNCs) have shown promise for optoelectronic and photovoltaic applications due to their unique properties, such as tunable bandgap and high stability. A recent study investigated the effects of coating CsPbBr3 nanocrystal surfaces with a Cs4PbBr6 shell on the charge transfer properties of PNCs. The results showed that post-treatment with ethyl acetate induced a phase change, improving external charge transfer properties, while post-treatment with isopropyl alcohol maintained the original structure and enhanced optical properties, both important for PNCs in photovoltaic and photoelectrochemical devices.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Chemistry, Physical
Andrei Mitrofanov, Anatol Prudnikau, Francesco Di Stasio, Nelli Weiss, Rene Huebner, Anna Maria Dominic, Konstantin B. L. Borchert, Vladimir Lesnyak, Alexander Eychmueller
Summary: This study successfully synthesized core/shell NPLs containing 0D CdxHg1-xSe domains in CdSe NPLs, and coated them with a CdyZn1-yS shell while preserving their 2D morphology. The NPLs exhibit bright photoluminescence in the near-infrared range with high quantum yields, making them a promising material for light-emitting applications.
CHEMISTRY OF MATERIALS
(2021)
Article
Optics
Yanqing Zhu, Cong Shen, Xueqing Xu, Jianhua Zou, Lei Wang, Xudong Cheng, Jingqiu Liang, Xiudi Xiao, Gang Xu
Summary: This study investigates the effect of halogen acid treatment on the luminescence properties of InP/GaP/ZnS quantum dots (QDs). It is found that hydrofluoric acid (HF) and hydrochloric acid (HCl) can improve the optical properties of QDs, while hydrobromic acid (HBr) and hydroiodic acid (HI) are not conductive to enhance the photoluminescence quantum yield (PL QY) of QDs. HF and HCl can effectively etch the oxidative layer and passivate the surface indium dangling bonds in the form of atomic ligands. The proposed charge carrier recombination model suggests that the significantly improved PL QY after acid treatment is attributed to the recombination of electron-hole pairs mainly from the conduction band and valence band. InP QDs treated with HF exhibit the best luminescence properties, with a high PL QY of 96%, offering great potential for advanced optoelectronic devices.
JOURNAL OF LUMINESCENCE
(2023)
Article
Chemistry, Inorganic & Nuclear
Carena L. Daniels, Megan Knobeloch, Philip Yox, Marquix A. S. Adamson, Yunhua Chen, Rick W. Dorn, Hao Wu, Guoquan Zhou, Huajun Fan, Aaron J. Rossini, Javier Vela
Article
Chemistry, Multidisciplinary
Lin Wei, Marquix A. S. Adamson, Javier Vela
Editorial Material
Chemistry, Physical
Jun Lu, Javier Vela, Dongling Ma
ACS ENERGY LETTERS
(2020)
Article
Chemistry, Physical
Alan M. Medina-Gonzalez, Bryan A. Rosales, Umar H. Hamdeh, Matthew G. Panthani, Javier Vela
CHEMISTRY OF MATERIALS
(2020)
Editorial Material
Chemistry, Physical
Nam-Soon Choi, Javier Vela, Jeffrey DuBose, Prashant V. Kamat
ACS ENERGY LETTERS
(2021)
Editorial Material
Chemistry, Inorganic & Nuclear
Javier Vela, Emily A. Weiss
INORGANIC CHEMISTRY
(2021)
Editorial Material
Chemistry, Physical
Javier Vela
CHEMISTRY OF MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Yunhua Chen, Rick W. Dorn, Michael P. Hanrahan, Lin Wei, Rafael Blome-Fernandez, Alan M. Medina-Gonzalez, Marquix A. S. Adamson, Anne H. Flintgruber, Javier Vela, Aaron J. Rossini
Summary: Dynamic nuclear polarization solid-state NMR spectroscopy was used to study the surface structures of zinc blende CdSe nanocrystals capped with carboxylic acid ligands. The experiments revealed the coordination environments of Cd and Se atoms on the surface, as well as the connectivity between them, confirming the predominant presence of CdSe2O2 and SeCd4 species. This methodology can be generally applied to obtain detailed surface structures of various main group semiconductor nanoparticles.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2021)
Article
Chemistry, Physical
Marquix A. S. Adamson, Philip Yox, Thomas Hernandez, Fei Wang, Javier Vela
Summary: The nickel chalcogenide family, including pyrite-type NiS2 and NiSe2, has various applications in industries such as electrocatalysis, batteries, and solar cells. This study focuses on the phase transformations of NiS2 and polymorphism of NiSe2, and demonstrates the controllable synthesis of nanocrystalline pyrites without impurities. The synthesized pyrite nanocrystals show promising catalytic activity in the reduction of nitrobenzene.
CHEMISTRY OF MATERIALS
(2022)
Article
Chemistry, Physical
Carena L. Daniels, Da-Jiang Liu, Marquix A. S. Adamson, Megan Knobeloch, Javier Vela
Summary: This study investigates the selectivity of intermetallic nanoparticles in catalytic reduction of nitroarenes, revealing that certain intermetallic nanoparticles exhibit high selectivity for azo(xy) products. By combining machine learning and molecular dynamics, a deeper understanding of the unique selectivity of these materials is achieved, showcasing the potential for intermetallic nanoparticles to be both active and selective in various important chemical transformations and applications.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Chemistry, Inorganic & Nuclear
Carena L. Daniels, Eunbyeol Gi, Benjamin A. Atterberry, Rafael Blome-Fernandez, Aaron J. Rossini, Javier Vela
Summary: Heterobimetallic complexes have diverse structures and reactivities, and can serve as single-source precursors for synthesizing binary intermetallic compounds. This study investigates the binding energies of phosphorous-based ligands and the reactivity of heterobimetallic complexes, showing that stronger binding ligands inhibit access to active sites. The findings provide insights into ligand-binding energetics and predict reactivity as precursors and catalysts.
INORGANIC CHEMISTRY
(2022)
Article
Chemistry, Multidisciplinary
Alison N. Roth, Yunhua Chen, Marquix A. S. Adamson, Eunbyeol Gi, Molly Wagner, Aaron J. Rossini, Javier Vela
Summary: This study presents a colloidal synthesis method for alkaline-earth chalcogenide nanocrystals using the reaction of metal carboxylates with carbon disulfide or selenourea. The particle sizes of the nanocrystals can be tuned by exploring the synthetic phase space, and the phase purity of the selenide compositions are confirmed using solid-state NMR spectroscopy. Additionally, barium di- and triselenides, rare nanocrystalline alkaline-earth polychalcogenides, are successfully synthesized using this method, and electronic structure calculations reveal their semiconducting properties.
Article
Chemistry, Physical
Alan M. Medina-Gonzalez, Philip Yox, Yunhua Chen, Marquix A. S. Adamson, Bryan A. Rosales, Maranny Svay, Emily A. Smith, Richard D. Schaller, Kui Wu, Aaron J. Rossini, Kirill Kovnir, Javier Vela
Summary: Alkali pnictogen dichalcogenides-I-V-VI2 are promising semiconducting materials for energy conversion devices. However, the controlled synthesis and understanding of their structures are still underdeveloped. This study successfully synthesized a series of APnCh(2) materials using solution-phase chemistry, and controlled the degree of ordering through temperature manipulation.
CHEMISTRY OF MATERIALS
(2022)
Article
Chemistry, Physical
Eunbyeol Gi, Yunhua Chen, Xuan Robben Wang, Scott L. Carnahan, Sharifur Rahman, Emily A. Smith, Aaron J. Rossini, Javier Vela
Summary: This research reports a method of achieving large-scale slippage of bulk tungsten diselenide layers through grinding in the presence of common solvents. The chemically induced slippage may represent an intermediate step towards the exfoliation of these materials, and it is of significance for expanding their synthetic utility and further understanding the mechanical and optoelectronic properties of layered materials.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
Article
Chemistry, Physical
Alison N. Roth, Jemima Opare-Addo, Eunbyeol Gi, Silvia Mena, Gonzalo Guirado, Richard D. Schaller, Emily A. Smith, Javier Vela
Summary: Mixed-metal chalcohalide semiconductors, specifically Pb2SbS2I3 and Pb2BiS2I3, were synthesized in solution phase using readily available precursors. The reaction parameters were fine-tuned to produce rod-like structures with tunable dimensions. The quaternary chalcohalides exhibited photoluminescence both as an ensemble and at the single particle level, as observed through fluorescence microscopy. Electronic structure calculations were used to evaluate the stability and band gap of Pb2SbS2I3 polymorphs and their coloring patterns. These synthetic methods pave the way for further exploration of complex chalcohalides and other multinary semiconductors for new technological applications.
CHEMISTRY OF MATERIALS
(2023)