Article
Chemistry, Multidisciplinary
Michael F. Lichtenegger, Jan Drewniok, Andreas Bornschlegl, Carola Lampe, Andreas Singldinger, Nina A. Henke, Alexander S. Urban
Summary: This study investigates the exciton diffusion behavior in two-dimensional halide perovskite nanocrystal films using spatially and temporally resolved optical microscopy. The results show that the diffusion length at room temperature is inversely correlated with the nanocrystal thickness, and the exciton diffusion decreases with increasing temperature, albeit at different rates for different films. Thinner nanoplakes exhibit longer diffusion lengths at specific temperature turnover points. This anomalous diffusion behavior is attributed to the coexistence of excitons and free electron hole-pairs within individual nanocrystals.
Article
Chemistry, Applied
Xiaoyu Zhao, Meifeng Wang, Zhiwang Cai, Daoyu Xia, Lei Zhao, Qingwei Song, Yiru Qin, Wei Wei
Summary: By optimizing the Yb3+ doping concentration and particle size, and selecting suitable organic dye sensitizers, the performance of dye-sensitized UCNPs can be maximized, with dye sensitization proving to be more favorable for smaller-sized UCNPs.
Article
Nanoscience & Nanotechnology
Ting-Yuan Chang, Hyunseok Kim, William A. Hubbard, Khalifa M. Azizur-Rahman, Jung Jin Ju, Je-Hyung Kim, Wook-Jae Lee, Diana Huffaker
Summary: This article reports on the monolithic integration of InAsP quantum dots embedded in InP nanowires on silicon, showing potential for building next-generation quantum light sources.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Engineering, Chemical
Yi-Jui Yeh, Wei Lin, Wei-Hung Chiang, Kuo-Lun Tung
Summary: Researchers have developed a thin-film nanocomposite membrane based on nitrogen-doped graphene quantum dots, which can achieve ultrahigh water transportation and purification efficiency. By controlling optical properties and tuning porous nanostructures, the membrane exhibits excellent water permeability and separation efficiency. The stable photoluminescence emission of the membrane enables monitoring of dye-fouling during water purification.
JOURNAL OF MEMBRANE SCIENCE
(2023)
Article
Chemistry, Multidisciplinary
Yanping Wang, Yusen Yang, Dingke Zhang, Tong Zhang, Shiyi Xie, Yu Zhang, Yong-Biao Zhao, Xiaoyun Mi, Xiuling Liu
Summary: This study reports an exciton sensitizing approach to improve the performance of quantum-dot light-emitting diodes (QLEDs) by forming excitons on a phosphorescent-dye-doped layer and transferring their energies to adjacent quantum-dot layer. The fabricated red QLEDs using this method achieve record high efficiency and good stability.
ADVANCED MATERIALS
(2023)
Article
Quantum Science & Technology
Marco De Gregorio, Shangxuan Yu, Donald Witt, Becky Lin, Matthew Mitchell, Lukasz Dusanowski, Christian Schneider, Lukas Chrostowski, Tobias Huber-Loyola, Sven Hoefling, Jeff F. Young, Andreas Pfenning
Summary: The collection of single-photon emission from a quantum dot is demonstrated using a Bragg waveguide and a photonic wire bond in a cryogenic environment. The use of the photonic wire bond eliminates the need for in-cryostat alignment, offering a scalable integration of quantum photonic devices. The findings highlight the feasibility of using photonic wire bonds for single-photon collection at low temperatures.
ADVANCED QUANTUM TECHNOLOGIES
(2023)
Article
Materials Science, Multidisciplinary
Roohollah Nakhaei, Alireza Razeghizadeh, Pejman Shabani, Jabbar Ganji, Seyed Sajjad Tabatabaee
Summary: This paper presents a new approach for enhancing the performance of dye sensitized solar cells (DSSC) by combining co-sensitization and Förster resonance energy transfer (FRET) from natural pigments to synthetic pigment. The results show that natural pigments can be more effective in the FRET process as energy-donors compared to synthetic pigment, and sensitizing TiO2 directly with an organic synthetic pigment improves the loading capacity on the semiconductor.
Article
Chemistry, Inorganic & Nuclear
Yuting Liang, Ying Tao, Congli Cao, Yunni Liu, Hu Xu, Jun Yu, Jianwei Tao, Guisheng Li, Yuhong Wang
Summary: In this study, a novel narrow band gap sulfur quantum dots (SQDs)-modified BiOCl heterojunction (BOC/SQDs) is reported for the efficient photocatalytic degradation of organic pollutants. The high photocatalytic activity of RhB-sensitized BOC/SQDs heterojunction is attributed to improved visible-light response capacity, high surface area/pore volume, suitable band structure for efficient electron transfer, and an increased number of electrons via RhB-sensitization for reactive oxygen species (ROS) generation.
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
(2022)
Article
Chemistry, Physical
Diptiman Dinda, Hyunho Park, Soo Young Park
Summary: By combining N/S hetero atom doping in GQD structure and molecular structural elaboration of organic dye, the study successfully addressed the stability issue of metal-free photocatalysts and achieved sustained HER activity over two days. The N,S-co doping and efficient photoinduced electron transfer to GQD core facilitated by phenazine dye were key factors in improving catalytic efficiency and photostability.
JOURNAL OF CATALYSIS
(2021)
Article
Biophysics
Shasha Lu, Jianyu Yang, Huanhuan Xing, Yuanyuan Chang, Jian Sun, Chunxian Guo, Xiurong Yang
Summary: Early and accurate diagnosis of acute myocardial infarction (AMI) is crucial for reducing patient mortality. In this study, a miRNA addition probe was designed using a DNA photonic wire (PW) with no spectral crosstalk, enabling the additive analysis of two up-regulated miRNAs (miR-133a and miR-208a) for early diagnosis of AMI in clinical serum samples. The developed probe achieved a 100% accurate diagnosis of early AMI using the K-Means clustering algorithm applied to the output signals.
BIOSENSORS & BIOELECTRONICS
(2023)
Article
Nanoscience & Nanotechnology
Sharanabasava D. Hiremath, Ankit Thakuri, Manu M. Joseph, Akhil A. Bhosle, Kaustabh Kumar Maiti, Mainak Banerjee, Amrita Chatterjee
Summary: When the body temperature rises above 40.6 degrees C, heat stress can cause mitochondrial damage, leading to cell death. Dysregulation of SO2 levels in the mitochondria is linked to this heat stress, and detecting it can be an early indicator of heat stroke. Graphene quantum dots (GQDs) have potential as sensory probes for monitoring SO2 levels in living cells.
ACS APPLIED NANO MATERIALS
(2023)
Review
Chemistry, Multidisciplinary
Amelie Heuer-Jungemann, Neus Feliu, Ioanna Bakaimi, Majd Hamaly, Alaaldin Alkilany, Indranath Chakraborty, Atif Masood, Maria F. Casula, Athanasia Kostopoulou, Eunkeu Oh, Kimihiro Susumu, Michael H. Stewart, Igor L. Medintz, Emmanuel Stratakis, Wolfgang J. Parak, Antonios G. Kanaras
Article
Chemistry, Multidisciplinary
Hieu Bui, Carl W. Brown, Susan Buckhout-White, Sebastian A. Diaz, Michael H. Stewart, Kimihiro Susumu, Eunkeu Oh, Mario G. Ancona, Ellen R. Goldman, Igor L. Medintz
Article
Chemistry, Physical
Sarah Brittman, Adam E. Colbert, Todd H. Brintlinger, Paul D. Cunningham, Michael H. Stewart, William B. Heuer, Rhonda M. Stroud, Joseph G. Tischler, Janice E. Boercker
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2019)
Article
Chemistry, Multidisciplinary
Ajmeeta Sangtani, Okhil K. Nag, Eunkeu Oh, Michael H. Stewart, James B. Delehanty
Summary: In this study, a quantum dot-chlorin e6 nanobioconjugate system was developed for membrane-localized ROS generation, leading to lipid peroxidation, increased membrane permeability, and inhibition of cellular proliferation. This system represents a promising approach for the further evolution of QD-based PDT systems.
JOURNAL OF NANOPARTICLE RESEARCH
(2021)
Article
Chemistry, Physical
Okhil K. Nag, Megan E. Muroski, Lauren D. Field, Michael H. Stewart, Eunkeu Oh, Kimihiro Susumu, Joseph R. Spangler, Scott A. Walper, James B. Delehanty
Summary: The study introduces a novel approach utilizing nanoparticle bioconjugates to activate channelrhodopsin C1V1 (ChR-C1V1) in HEK 293T/17 cell membranes. It demonstrates the specific activation of ChR-C1V1 channels through laser-induced opening with photoexcited quantum dots as an energy donor. This work represents a new hybrid system for controlling ion channel activity by interfacing quantum dots with living cells.
PARTICLE & PARTICLE SYSTEMS CHARACTERIZATION
(2021)
Article
Materials Science, Multidisciplinary
Paul D. Cunningham, Christopher M. Spillmann, Joseph S. Melinger, Mario G. Ancona, Young C. Kim, Divita Mathur, Susan Buckhout-White, Ellen R. Goldman, Igor L. Medintz
Summary: Experimental results based on a model system show that the dual rail design is more efficient than the split rail design, and optimized dual rails can achieve 50% end-to-end efficiency. By balancing the increase in FRET rate from multiple interacting pathways with undesirable fluorescence quenching between dyes in close proximity, functional photonic wires can be designed.
ADVANCED OPTICAL MATERIALS
(2021)
Article
Biochemical Research Methods
Divita Mathur, Meghna Thakur, Sebastian A. Diaz, Kimihiro Susumu, Michael H. Stewart, Eunkeu Oh, Scott A. Walper, Igor L. Medintz
Summary: Cell-free synthetic biology is a valuable tool for developing portable biosensors. By using a modular quantum dot-based reporter platform, it is possible to detect multiple analytes simultaneously.
ACS SYNTHETIC BIOLOGY
(2022)
Article
Multidisciplinary Sciences
Joyce C. C. Breger, James N. N. Vranish, Eunkeu Oh, Michael H. H. Stewart, Kimihiro Susumu, Guillermo Lasarte-Aragone's, Gregory A. A. Ellis, Scott A. A. Walper, Sebastian A. Diaz, Shelby L. L. Hooe, William P. P. Klein, Meghna Thakur, Mario G. G. Ancona, Igor L. L. Medintz
Summary: Enzymes in multistep cascades can self-assemble with nanoparticles into nanoclusters, allowing for directed substrate transport and significant improvement in catalytic flux. Efficiency of the channeling can be enhanced by optimizing enzymatic stoichiometry, using two-dimensional nanoplatelets, and ordering the enzyme assembly. Detailed analyses confirm the formation of the assembly and clarify the structure-function properties, verifying the generalized applicability of these self-assembled biocatalytic nanoclusters.
NATURE COMMUNICATIONS
(2023)
Review
Pharmacology & Pharmacy
Okhil K. Nag, Kwahun Lee, Michael H. Stewart, Eunkeu Oh, James B. Delehanty
Summary: This review summarizes the progress made over the past 5 years in the use of various nanoparticle bioconjugates for the therapeutic delivery of nitric oxide. The advantages and challenges of using these materials for controlled nitric oxide delivery are discussed. Nitric oxide plays critical roles in cellular health and disease, but its physicochemical properties present challenges for specific and efficient delivery. Recent research has focused on utilizing nanoparticle carriers to enhance nitric oxide delivery.
THERAPEUTIC DELIVERY
(2022)
Article
Nanoscience & Nanotechnology
William P. Klein, Brian S. Rolczynski, Sean M. Oliver, Reza Zadegan, Susan Buckhout-White, Mario G. Ancona, Paul D. Cunningham, Joseph S. Melinger, Patrick M. Vora, Wan Kuang, Igor L. Medintz, Sebastian A. Diaz
ACS APPLIED NANO MATERIALS
(2020)
Article
Nanoscience & Nanotechnology
Todd H. Brintlinger, Susan Buckhout-White, Nabil D. Bassim, Divita Mathur, Anirban Samanta, Jeremy T. Robinson, Juan-Carlos Idrobo, Rhonda M. Stroud, Ellen R. Goldman, Mario G. Ancona
ACS APPLIED NANO MATERIALS
(2020)
Proceedings Paper
Optics
Sebastian A. Diaz, William P. Klein, Sean M. Oliver, David A. Hastman, Susan Buckhout-White, Mario G. Ancona, Paul D. Cunningham, Joseph S. Melinger, Patrick M. Vora, Igor L. Medintz
2018 IEEE RESEARCH AND APPLICATIONS OF PHOTONICS IN DEFENSE CONFERENCE (RAPID)
(2018)
Article
Chemistry, Multidisciplinary
Susan Buckhout-White, Chanel Person, Igor L. Medintz, Ellen R. Goldman
Article
Chemistry, Multidisciplinary
Michael H. Stewart, Kimihiro Susumu, Eunkeu Oh, Christopher G. Brown, Collin C. McClain, Edward P. Gorzkowski, Darryl A. Boyd