Article
Chemistry, Multidisciplinary
Benjamin F. P. McVey, Robert A. Swain, Delphine Lagarde, Wilfried-Solo Ojo, Kaltoum Bakkouche, Cecile Marcelot, Benedicte Warot, Yann Tison, Herve Martinez, Bruno Chaudret, Celine Nayral, Fabien Delpech
Summary: II-V semiconductor nanocrystals such as Cd3P2 and Zn3P2 have great potential in next-generation optoelectronic devices. However, their instability with respect to air and moisture poses challenges. The synthesis and study of the Cd3P2/Zn3P2 core-shell system reveal improvements in terms of structure, chemistry, and optical properties, with crystallographic concerns playing a key role.
Article
Chemistry, Physical
Minji Son, Suhyeon Kim, Younki Lee, Jiwon Bang
Summary: Near infrared-emitting type-II In(Zn)P/ZnTe (core/shell) quantum dots have been developed with tunable emission range by adjusting core diameter and shell thickness. These heavy-metal-free, water-soluble quantum dots show potential for widespread applications in biomedicine and energy fields.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Nanoscience & Nanotechnology
Zhongjiang Sun, Qianqian Wu, Sheng Wang, Fan Cao, Yimin Wang, Lufa Li, Haihui Wang, Lingmei Kong, Limin Yan, Xuyong Yang
Summary: Indium phosphide (InP) quantum dots (QDs) with highly luminescent InP/ZnSe/ZnS QDs were successfully synthesized by constructing Se-rich shielding layers on the surfaces of InP cores, which improved the external quantum efficiency of QLED devices at high luminance.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Physics, Applied
Navapat Krobkrong, Taro Uematsu, Tsukasa Torimoto, Susumu Kuwabata
Summary: Silver indium sulfide/gallium selenide core/shell quantum dots were developed to exhibit red band-edge emission. The addition of gallium selenide shell resulted in a redshift of the photoluminescence spectrum, and after posttreatment with HCl, the photoluminescence wavelength was further redshifted due to the formation of Ag-In-S-Se alloyed cores. Additionally, the photoluminescence wavelength could be tuned by varying the S/(S + Se) ratio in the Ga-S-Se ternary shells.
JAPANESE JOURNAL OF APPLIED PHYSICS
(2023)
Article
Chemistry, Physical
Reyhaneh Toufanian, Margaret Chern, Victoria H. Kong, Allison M. Dennis
Summary: The study investigates the impact of core composition, shell composition, and shell thickness on the optical properties of semiconductor nanocrystal quantum dots, revealing the ability to produce brightness-matched green and red emitters by adjusting the thickness of the ZnSe shell.
CHEMISTRY OF MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
David B. Berkinsky, Andrew H. Proppe, Hendrik Utzat, Chantalle J. Krajewska, Weiwei Sun, Tara Sverko, Jason J. Yoo, Heejae Chung, Yu-Ho Won, Eunjoo Jang, Moungi G. Bawendi
Summary: Red-emitting InP/ZnSe/ZnS quantum dots (QDs) have narrower line widths than typically synthesized CdSe QDs, making them suitable for high color purity displays. Our analysis reveals that at low temperatures, phonon scattering and fine-structure splitting are the main broadening mechanisms, while at elevated temperatures, phonon scattering dominates and optical scattering plays a minor role in line broadening. These findings can inform the rational design of QD materials with narrower line widths.
Article
Nanoscience & Nanotechnology
Jie Meng, Qian Zhao, Weihua Lin, Tonu Pullerits, Kaibo Zheng
Summary: This study demonstrates the biexciton dynamics of core/shell quantum dots with submonolayer shell coverage. The results show that these quantum dots have a prolonged Auger lifetime. However, unlike conventional quantum dots, the dependence of the Auger recombination time on quantum dot size features two constant stages. This study provides a reference for the application of core-shell quantum dots in optoelectronic devices.
ADVANCED ELECTRONIC MATERIALS
(2023)
Article
Optics
Xia Ran, Congcong Chen, Zhongran Wei, Zhen Chi, Yatao Pan, Yanmin Kuang, Xiaojuan Wang, Lijun Guo
Summary: This study investigates the shell-dependent blinking behavior and carrier dynamics in CdxZn1-xSeyS1-y@ZnS core/shell quantum dots. The results show that the on-time fraction of blinking emission can be effectively increased by capping the ZnS shell, and the carrier dynamics exhibit dependence on the shell thickness. These findings demonstrate the importance of shell encapsulation in regulating the optical properties of quantum dots.
JOURNAL OF LUMINESCENCE
(2022)
Article
Materials Science, Multidisciplinary
Thomasina Zaengle, Enrique Martinez, Thomas W. Hawkins, Colin McMillen, John Ballato
Summary: The flux assisted molten core method is used to fabricate crystalline selenide and phosphide cores. The introduction of a flux reduces the temperature and vapor pressure of the alloy melt, allowing for successful fabrication of these volatile materials.
Article
Chemistry, Physical
Xiaoyan Li, Chaojin Xuan, Boxu Yang, Weichen Wang, Mingzhong Wang, Xiaopeng Zhao
Summary: In this paper, center-doped monodisperse Cu-doped ZnSe (ZnSe:Cu) quantum dots are synthesized by co-nucleation doping method, and then a double-layered ZnS shell is grown on the QDs. The prepared ZnSe:Cu/ZnS/ZnS QDs exhibit high photoluminescence intensity and excellent stability in the blue region. The stability is attributed to the ZnS shell grown outside the ZnSe:Cu core, which effectively limits excitons and Cu and isolates O2. This work provides a new approach to enhance the stability of quantum dots.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Multidisciplinary
Qianqian Wu, Fan Cao, Sheng Wang, Yimin Wang, Zhongjiang Sun, Jingwen Feng, Yang Liu, Lin Wang, Qiang Cao, Yunguo Li, Bin Wei, Wai-Yeung Wong, Xuyong Yang
Summary: A quasi-shell-growth strategy was reported to synthesize highly luminescent green InP/ZnSe/ZnS quantum dots, in which zinc and selenium monomers were added at the initial nucleation stage of InP cores to form a quasi-ZnSe shell instead of a bulk ZnSe shell. This strategy greatly improved the electroluminescence performance of green InP quantum dots.
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, 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, Multidisciplinary
Alexander M. Saeboe, Alexey Y. Nikiforov, Reyhaneh Toufanian, Joshua C. Kays, Margaret Chern, J. Paolo Casas, Keyi Han, Andrei Piryatinski, Dennis Jones, Allison M. Dennis
Summary: This report showcases the reddest emitting indium phosphide quantum dots to date, demonstrating tunable near-infrared photoluminescence and PL multiplexing in the first optical tissue window while avoiding toxic constituents. By utilizing an inverted QD heterostructure, the synthesis overcomes the growth bottleneck and extends the emission peak of the nanoparticles into the deeper optical tissue window.
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
Biochemistry & Molecular Biology
Oleg Kovtun, Ruben Torres, Riley S. Ferguson, Travis Josephs, Sandra J. Rosenthal
Summary: D2 dopamine receptors play a crucial role in regulating dopamine levels in the brain and their lateral diffusion serves as a sensitive indicator of receptor activity status, potentially informing drug discovery efforts based on single-molecule pharmacology.
Article
Physics, Condensed Matter
S. Kamali, E. Yu, B. Bates, J. R. McBride, C. E. Johnson, V Taufour, P. Stroeve
Summary: A method for synthesizing core-shell nanoparticles with a magnetic core and a porous shell suitable for drug delivery and medical applications is presented. The density of γ-Fe2O3 in nanoparticles is influenced by the template groups, and the magnetic nanoparticles penetrate deep into the silica to form the core-shell structure.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2021)
Article
Chemistry, Multidisciplinary
Wenxing Yang, Yawei Liu, David A. Cullen, James R. McBride, Tianquan Lian
Summary: Plasmonic semiconductors, with their bandgap and band-bending properties, offer new opportunities for energy upconversion processes and show potential advantages in hot carrier-based devices compared to plasmonic metals. The demonstration of rapid hot electron transfer and longer lifetime in a plasmonic p-n heterojunction showcases the potential of plasmonic semiconductors in utilizing near-IR photons and enhancing device performance.
Article
Nanoscience & Nanotechnology
Jia Song, Jinlin Long, Yawei Liu, Zihao Xu, Aimin Ge, Brandon D. Piercy, David A. Cullen, Ilia N. Ivanov, James R. McBride, Mark D. Losego, Tianquan Lian
Summary: This study demonstrates the high quantum efficiency of plasmonic hot-electron transfer from silver nanoparticles to TiO2 films under specific excitation conditions. The results suggest that decreasing particle sizes can enhance the efficiency of hot-electron transfer.
Article
Chemistry, Multidisciplinary
Zhiliang Pan, Yi Tao, Yang Zhao, Matthew L. Fitzgerald, James R. McBride, Lei Zhu, Deyu Li
Summary: The contact thermal resistance between individual boron nitride nanotubes is largely determined by reflection of ballistic phonons, but can be influenced by the presence of a poly(vinylpyrrolidone) interlayer. The interlayer can either enhance or reduce the contact thermal resistance by converting the transport mechanism from ballistic phonon dominated to diffusion through the interlayer. This study provides insights into the design of high thermal conductivity boron nitride nanotube-polymer composites.
Correction
Psychiatry
Richard McCarty, Travis Josephs, Oleg Kovtun, Sandra J. Rosenthal
TRANSLATIONAL PSYCHIATRY
(2021)
Review
Psychiatry
Richard McCarty, Travis Josephs, Oleg Kovtun, Sandra J. Rosenthal
Summary: Bipolar disorder patients often exhibit disturbances in circadian and seasonal rhythms, with symptoms influenced by the season and specific times and places. However, animal models have not fully capitalized on these seasonal patterns to investigate the molecular mechanisms associated with mania and depression-like behaviors.
TRANSLATIONAL PSYCHIATRY
(2021)
Editorial Material
Behavioral Sciences
Sandra J. Rosenthal, Travis Josephs, Oleg Kovtun, Richard McCarty
Summary: The literature generally agrees that bipolar disorder is seasonal, but the changes in mood and energy levels may be more closely related to the rate of change of solar insolation.
BRAIN AND BEHAVIOR
(2021)
Article
Chemistry, Multidisciplinary
Cara E. Bradsher, Cayla D. Ontko, Alexandra C. Koziel, James R. McBride, Sandra J. Rosenthal
Summary: This research has found that ferroelectric behavior can be achieved in nanoparticles through ion exchange, with fluorescence retention achieved through CdS shelling before ion exchange, containing defects in the CdS shell rather than the fluorescent CdSe cores. The ferroelectric response remains constant with an increase in the number of CdS monolayers, while fluorescence retention also increases, reaching 99% at 8 monolayers, allowing for the addition of ferroelectric applications to the growing list of quantum dot applications.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2022)
Review
Multidisciplinary Sciences
Joseph D. Keene, Nathaniel J. Freymeyer, James R. McBride, Sandra J. Rosenthal
Summary: This review focuses on the characteristics of semiconductor nanocrystals and the methods of ultrafast spectroscopy, with CdSe nanocrystals as the main topic. Various types of nanocrystal systems are also discussed.
Article
Chemistry, Multidisciplinary
Madeleine J. Fort, Sophia M. Click, Evan H. Robinson, Felix M. C. He, Paul Bernhardt, Sandra J. Rosenthal, Janet E. Macdonald
Summary: Light-induced charge separation plays a crucial role in solar harvesting technologies, and the internal reorganization energy has a profound impact on charge transfer rates. Experimental and theoretical studies demonstrate that reducing the reorganization energy can greatly increase charge transfer rates, even more significantly than the driving force. This suggests that careful design of redox mediators to minimize reorganization energy is a promising approach to enhance the efficiency of quantum dot applications.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Electrochemistry
Oleg Kovtun, Sandra J. Rosenthal
Summary: Super-resolution microscopy encompasses a range of powerful imaging techniques for studying the organization and dynamics of biomolecules at the nanoscale. Choosing the right technique to answer specific questions becomes challenging due to the increasing number of techniques and their distinct limitations. The labeling strategy and cell processing have a significant impact on the observed transporter dynamics, highlighting the importance of careful experimental validation in super-resolution imaging.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2022)
Review
Chemistry, Physical
Sophia M. Click, Sandra J. Rosenthal
Summary: InP quantum dots (QDs) have great potential as emitters for solid-state lighting, lasing, and bioimaging without the inherent toxicity concern. Recent efforts have achieved InP-based QDs with >95% quantum yields (QYs) comparable to their CdSe counterparts by understanding growth mechanisms, controlling nanocrystal shape, in situ formation of surface oxides, and growing thick, uniform shells.
CHEMISTRY OF MATERIALS
(2023)
Article
Multidisciplinary Sciences
Taylor S. Teitsworth, David J. Hill, Samantha R. Litvin, Earl T. Ritchie, Jin-Sung Park, James P. Custer, Aaron D. Taggart, Samuel R. Bottum, Sarah E. Morley, Seokhyoung Kim, James R. McBride, Joanna M. Atkin, James F. Cahoon
Summary: Artificial photosynthesis for hydrogen fuel production has not yet become a widespread technology, but researchers have made progress by synthesizing high-photovoltage multijunction silicon nanowires that can catalytically split water.
