Article
Nanoscience & Nanotechnology
Kiin Nam, Hyuntae Kim, Woongkyu Park, Jae Sung Ahn, Soobong Choi
Summary: Scanning thermal microscopy (SThM) allows for the measurement of thermal characteristic information from signals obtained by scanning a thermometer probe over a sample surface. In this study, SThM is used to generate sub-wavelength near-field optical images in a plasmonic grating coupler, and it is shown that the dominant component of the SThM signal is from the optical response rather than the thermal response.
Article
Chemistry, Multidisciplinary
Federica Ricci, Veronica Marougail, Oleg Varnavski, Yue Wu, Suyog Padgaonkar, Shawn Irgen-Gioro, Emily A. Weiss, Theodore Goodson
Summary: This study used femtosecond time-resolved two-photon near-field scanning optical microscopy to reveal the coherence involving a single cesium lead bromide perovskite QD at room temperature. The electron coherence on a single perovskite QD was found to have a relatively long lifetime compared to other nanoparticles, possibly due to the exciton fine structure. The unique optical properties of these perovskite QDs, including bright triplet exciton states, suggest their potential for quantum computing and information processing applications.
Article
Chemistry, Multidisciplinary
Vincent Notot, Willem Walravens, Maxime Berthe, Nemanja Peric, Ahmed Addad, Xavier Wallart, Christophe Delerue, Zeger Hens, Bruno Grandidier, Louis Biadala
Summary: The doping in square and epitaxially fused PbSe quantum dot superlattices was explored using low-temperature scanning tunneling microscopy and spectroscopy. The study found that the electronic coupling between quantum dots leads to the release and capture of free holes.
Article
Nanoscience & Nanotechnology
Riya Dutta, Avradip Pradhan, Praloy Mondal, Saloni Kakkar, T. Phanindra Sai, Arindam Ghosh, Jaydeep Kumar Basu
Summary: Hybrid devices consisting of graphene or TMDs and semiconductor QDs have been widely studied for photodetector and photovoltaic applications, requiring high IQE and enhanced carrier diffusion length. Electrical measurements on such devices showed high IQE and significant enhancement of carrier diffusion length, which could be tuned by varying back gate voltage and controlling charge separation from the proximal QD layer. The obtained IQE values were remarkably high, and further improvement could be achieved by stacking multiple layers of QDs for potential applications in high-efficiency photodetectors and active photovoltaic materials.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Chemistry, Multidisciplinary
Artem O. Denisov, Seong W. Oh, Gordian Fuchs, Adam R. Mills, Pengcheng Chen, Christopher R. Anderson, Mark F. Gyure, Arthur W. Barnard, Jason R. Petta
Summary: Researchers have successfully combined the spatial resolution of scanning probe microscopy with the speed of microwave measurements by coupling a metallic tip to a Si/SiGe double quantum dot. They were able to observe excited states with an energy of -65microelectronvolts, consistent with valley splittings in Si/SiGe.
Article
Chemistry, Physical
Zeping Li, Xiong Yu, Yunhao Zhu, Sisi Liu, Xiaoyan Wen, Haifei Lu, Cong Wang, Xiao Li, Ming-Yu Li, Yingping Yang
Summary: In this study, ZnO quantum dot (QD) / magnetron sputtered ZnO homojunction photodetectors with excellent performance were fabricated by systematically varying the thickness ratios between two ZnO layers. The balanced ratio resulted in extra adsorption-desorption sites from the ZnO QDs and accelerated carrier transportation from the highly crystallized magnetron sputtered ZnO layers. As a result, the fabricated ZnO homojunction photodetector showed significantly increased responsivity and external quantum efficiency, paving the way for ultra-sensitive UV photodetection.
APPLIED SURFACE SCIENCE
(2022)
Article
Chemistry, Physical
Haraprasad Mandal, Madhu Chakali, Munisamy Venkatesan, Prakriti Ranjan Bangal
Summary: This study demonstrates hot electron transfer and ultrafast electron transfer between cadmium telluride quantum dots (CdTe QDs) and tetrakis(4-carboxyphenyl)porphyrin (TCPP) in newly prepared CdTe QD-tetrakis(4-carboxyphenyl)porphyrin nanocomposites (CdTe QD-TCPP NCs) using steady state, time-resolved emission, and femtosecond transient absorption spectroscopic techniques. The observation of efficient quenching of the photoluminescence of CdTe QDs with little change in photoluminescence decay profiles suggests a static interaction between CdTe QDs and TCPP. Excitation wavelength and intensity dependent studies confirm the hot electron transfer from higher excited states to TCPP, while ultrafast electron transfer from photoexcited TCPP to CdTe QDs is also observed.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Chemistry, Multidisciplinary
Ghaida Alosaimi, Chien-Yu Huang, Pankaj Sharma, Tom Wu, Jan Seidel
Summary: The exceptional electronic, optoelectronic, and sensing properties of inorganic Cs-based perovskites are influenced by defect chemistry. While organic halide perovskites have been extensively studied, understanding of defect properties at grain boundaries in inorganic Cs-based perovskite quantum dots (QDs) remains limited. Scanning probe microscopy measurements of thermally treated samples reveal morphology-dependent charge carrier dynamics in CsPbBr3 QDs at the nanoscale. Defect-engineered samples show higher surface potential at grain boundaries under light illumination, indicating their role as charge collection and transport channels. The annealing process not only controls morphology but also improves optoelectrical properties and ion migration dynamics.
Article
Materials Science, Multidisciplinary
Jeong-Yeol Yoo, Woon Ho Jung, Chil Won Lee, Byung Doo Chin, Jong-Gyu Kim, Jang Sub Kim
Summary: By partially substituting existing amine ligands with 2,2'-bipyridyl derivatives on the surface of QDs, significant improvements in the electronic properties of QD-LED devices were observed, including lowered charge-injection barriers and improved charge balance within the QDs. This led to high-performance QD-LED devices with a doubling in current density and a tripling in brightness, external quantum efficiency, and current efficiency.
ORGANIC ELECTRONICS
(2021)
Article
Nanoscience & Nanotechnology
Seon Woo Ahn, Minji Ko, Soyeon Yoon, Jun Hwan Oh, Yoonji Yang, Se Hak Kim, Jae Kyu Song, Young Rag Do
Summary: The use of triply protected approaches has successfully improved the photoluminescence quantum yield and environmental stability of QDs. The QD-embedded microbeads have optimized the uniform distribution of QDs, enhancing the luminous efficacy of color-by-blue QD displays.
ACS APPLIED NANO MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Ivan B. Karomi
Summary: This study compared InAsP QD materials with the standard InP QD laser and found that InAsP QD had a higher strain field and deeper dot confinement. The breakdown of the Fermi-Dirac distribution at 150K for InAsP QD materials was also observed, indicating the potential of InAsP for ultrafast source generation.
Article
Chemistry, Multidisciplinary
Michelle A. Smeaton, Ismail El Baggari, Daniel M. Balazs, Tobias Hanrath, Lena F. Kourkoutis
Summary: Epitaxially connected quantum dot solids have the potential for highly tunable electronic structures, but defective interdot connections have hindered the realization of predicted emergent electronic properties. In situ heating in the scanning transmission electron microscope has shown that thermal annealing can effectively eliminate tensile and shear defects, while bending defects still persist. Tracking the out-of-plane orientation of individual quantum dots reveals an increase in correctly oriented dots, indicating a relaxation of twisting or bending defects.
Article
Nanoscience & Nanotechnology
Rajarshi Roy, David Holec, Markus Kratzer, Philipp Muenzer, Preeti Kaushik, Lukas Michal, Gundam Sandeep Kumar, Lenka Zajickova, Christian Teichert
Summary: In recent years, graphene-based van der Waals (vdW) heterostructures have shown interesting charge transfer dynamics, which are significant for optoelectronic applications. In this study, a novel graphene-based 0D-2D vdW heterostructure between graphene and amine-functionalized graphene quantum dots (GQD) was investigated to study interfacial charge transfer and doping possibilities. The results revealed p-type doping in graphene induced by functional GQDs, as confirmed by ab initio simulations and Kelvin probe force microscopy (KPFM) measurements. Power-dependent Raman spectroscopy also showed a doping-induced gating effect in both graphene and the heterostructure, suggesting a breakdown of the adiabatic Born-Oppenheimer approximation and an asymmetry in conduction and carrier mobility.
Article
Engineering, Electrical & Electronic
A. Alzeidan, T. F. Cantalice, K. D. Vallejo, R. S. R. Gajjela, A. L. Hendriks, P. J. Simmonds, P. M. Koenraad, A. A. Quivy
Summary: The performance of infrared photodetectors based on submonolayer quantum dots was investigated as a function of the arsenic flux. Despite a reduction in the density of such nanostructures with decreasing arsenic flux, all devices showed similar figures of merit and a very high specific detectivity.
SENSORS AND ACTUATORS A-PHYSICAL
(2022)
Article
Engineering, Electrical & Electronic
Chung-Ping Huang, Guan-Teng Lin, Jhen-Jia Yang, Chien-Chung Lin
Summary: A CQD package with convex-surface solder reflectors showed improved thermal characteristics and optical reliability compared to traditional in-chip packages. Solder balls provided a direct cooling path and reflected blue photons to enhance recycling. Metal structures extended the device lifetime and provided a lower operating temperature for the packaged CQDs. This study advances the integration of high-thermal-conductivity components into quantum dot photonic devices.
IEEE TRANSACTIONS ON ELECTRON DEVICES
(2022)
Review
Biochemistry & Molecular Biology
Jinhuan Jiang, Jiang Pi, Jiye Cai
BIOINORGANIC CHEMISTRY AND APPLICATIONS
(2018)
Article
Medicine, Research & Experimental
Fen Yang, Xiaohui Su, Jiang Pi, Kangsheng Liao, Hua Zhou, Yang Sun, Juan Liu, Xiaoxia Guo, Jinhuan Jiang, Hua Jin, Jiye Cai, Ting Li, Liang Liu
BIOMEDICINE & PHARMACOTHERAPY
(2018)
Article
Chemistry, Analytical
Huimei Liu, Baocheng Wang, Dehai Li, Xueyi Zeng, Xiao Tang, Qingsheng Gao, Jiye Cai, Huai-hong Cai
Article
Pathology
Jin-Huan Jiang, Jiang Pi, Hua Jin, Fen Yang, Ji-Ye Cai
PATHOLOGY RESEARCH AND PRACTICE
(2018)
Article
Biochemistry & Molecular Biology
Jin-Huan Jiang, Jiang Pi, Hua Jin, Ji-Ye Cai
JOURNAL OF CELLULAR BIOCHEMISTRY
(2019)
Article
Biotechnology & Applied Microbiology
Jin-Huan Jiang, Jiang Pi, Hua Jin, Ji-Ye Cai
ARTIFICIAL CELLS NANOMEDICINE AND BIOTECHNOLOGY
(2018)
Article
Biochemistry & Molecular Biology
Sui-Ping Deng, Yi-Li Yang, Xing-Xing Cheng, Wen-Rong Li, Ji-Ye Cai
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2019)
Article
Materials Science, Biomaterials
Jiang Pi, Ling Shen, Hongbo Shen, Enzhuo Yang, Wandang Wang, Richard Wang, Dan Huang, Bao-Shiang Lee, Chunmiao Hu, Crystal Chen, Hua Jin, Jiye Cai, Gucheng Zeng, Zheng W. Chen
MATERIALS SCIENCE & ENGINEERING C-MATERIALS FOR BIOLOGICAL APPLICATIONS
(2019)
Article
Chemistry, Multidisciplinary
Jiang Pi, Ling Shen, Enzhuo Yang, Hongbo Shen, Dan Huang, Richard Wang, Chunmiao Hu, Hua Jin, Huaihong Cai, Jiye Cai, Gucheng Zeng, Zheng W. Chen
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2020)
Article
Biochemistry & Molecular Biology
Xiaokun Wang, Dongjuan Qiao, Likun Chen, Meng Xu, Shupeng Chen, Liyan Huang, Fang Wang, Zhen Chen, Jiye Cai, Liwu Fu
Article
Pathology
Jin-Huan Jiang, Jiang Pi, Ji-Ye Cai
PATHOLOGY RESEARCH AND PRACTICE
(2020)
Article
Engineering, Biomedical
Xueqin Huang, Huaihong Cai, Haibo Zhou, Ting Li, Hua Jin, Colin E. Evans, Jiye Cai, Jiang Pi
Summary: Manipulating protein degradation pathways such as ALP and UPS with Co3O4 NPs can enhance anticancer treatments by inducing autolysosome accumulation and inhibiting lysosomal proteolytic activity. Combining Co3O4 NPs with proteasome inhibitors also promotes the accumulation of autophagic substrates and protein ubiquitination to inhibit cancer progression. Additionally, leveraging the photothermal conversion efficiency of Co3O4 NPs enhances the anticancer efficacy of existing treatments in vitro and in vivo.
ACTA BIOMATERIALIA
(2021)
Article
Pharmacology & Pharmacy
Ke Changhong, Yuan Peng, Zhengqiang Yuan, Jiye Cai
Summary: The study found that ginsenoside Rb1 can protect cells from Aβ-induced cytotoxicity, acting as an agonist of PPARγ to reduce cholesterol levels in AD model cells. Lowering cholesterol levels reduced Aβ-induced cytotoxicity.
EUROPEAN JOURNAL OF PHARMACOLOGY
(2021)
Article
Pharmacology & Pharmacy
Jiang Pi, Jinhuan Jiang, Huaihong Cai, Fen Yang, Hua Jin, Peihui Yang, Jiye Cai, Zheng W. Chen
Article
Biochemistry & Molecular Biology
Aiqun Li, Jianwei Chen, Zhi-Hong Liang, Jiye Cai, Huai-Hong Cai, Min Chen
BIOCHEMICAL AND BIOPHYSICAL RESEARCH COMMUNICATIONS
(2017)
Article
Microscopy
Shengli Zhang, Ying Wang, Bowei Wang, Yi Zeng, Jiani Li, Xingyue Wang, Cuihua Hu, Zhankun Weng, Zuobin Wang
Summary: Curcumin was found to have effects on the activity, migration, and mitochondrial membrane potential of malignant hepatocytes and their mitochondria. The findings from both optical microscopy and atomic force microscopy studies confirm these effects on cell morphology and biomechanics.
Article
Microscopy
Rutika Sansaria, Krishanu Dey Das, Alwin Poulose
Summary: This paper presents a method for quantifying Golgi dispersion images and classifying them using machine learning models. By applying automated image processing and segmentation, extracting features, and using different classifiers, accurate classification of Golgi images is achieved.
Article
Microscopy
Marjorie da Silva, Cintia Eleonora Lopes Justino, Fernando Henrique Carnimeo, Fernando Barbosa Noll, Johan Billen
Summary: This article describes the secretory glands in females of two species of Myzinum and discusses their homology with other glands in the Hymenoptera order. The study finds that the three glands, instead of the commonly believed two, are present in Myzinum species. However, the limited research on the structure, function, and evolution of female accessory glands in Hymenoptera prevents conclusive statements.
Article
Microscopy
Ping Hao, Wen Yin, Xi Chen, Shuangshuang Qin, Yue Yu, Yuan Yuan, Xiaoyu Quan, Bing Hu, Shouhai Chen, Yi Wu
Summary: This study confirmed the secretion of nano-scale exosomes-multivesicular bodies and the interaction of high endothelial cells (HECs) with lysosomes and mitochondria in the small intestine of laying birds. Immunohistochemistry and immunofluorescence results showed the strong immunoreactivity of exosome-related proteins and autophagic-related proteins in the lamina propria of the small intestine. These findings reveal an innovative communication method among HECs in the small intestine.
Article
Microscopy
Stefan Talu, Robert S. Matos, Henrique Duarte da Fonseca Filho, Daniela Predoi, Simona Liliana Iconaru, Carmen Steluta Ciobanu, Liliana Ghegoiu
Summary: This study developed composite layers based on magnesium-doped hydroxyapatite and chitosan, and demonstrated their good biocompatibility and antifungal effects against osteosarcoma cells. The attachment and growth of the cells on the composite layers were promoted, while the growth of Candida albicans was inhibited. The morphological analysis revealed complex 3D patterns on the cancer cell surfaces on the magnesium-containing composite layers.