Article
Chemistry, Physical
Dallas P. Strandell, Arnab Ghosh, Davide Zenatti, Priya Nagpal, Patanjali Kambhampati
Summary: By using time-resolved photoluminescence spectroscopy, we have resolved the previously unobserved spectral dynamics of higher multiexcitons in CdSe quantum dots. These experiments provide a direct observation of multiexciton formation and annihilation, and reveal the sequential population of lower channels by higher channels. The findings have significant implications for the design of quantum dots to exploit higher multiexciton processes.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Article
Chemistry, Physical
Da-Eun Yoon, Juho Lee, Hyeonwoo Yeo, Junga Ryou, Young Kuk Lee, Yong-Hoon Kim, Doh C. Lee
Summary: Shape anisotropy in colloidal zincblende CdSe nanoplatelets directly affects their optical and electronic properties. The lateral aspect ratio of NPLs provides a way to control their optical characteristics, such as polarized emission, by varying the shape while keeping the thickness constant. Experimental and simulation studies have shown that the growth behavior of CdSe NPLs can be altered by adjusting the Cd(ac)(2)-to-Se precursor ratio, leading to different growth directions. The mechanism for the lateral growth of zincblende NPLs has been explained at the atomic level, shedding light on the transition processes of NPL morphology and growth direction.
CHEMISTRY OF MATERIALS
(2021)
Article
Chemistry, Physical
Meng Liu, Zhe-Yong Chen, Xiao-Hang He, Xing-Yu Liu, Huan Tian, Yi Liu, Feng-Lei Jiang
Summary: In this study, the exchange process of two aromatic ligands on the surface of quantum dots (QDs) was systematically investigated using nuclear magnetic resonance and isothermal titration calorimetry. The results showed that the ligand exchange with aromatic ligands was entropy-driven and the substitution position of the ligand had no significant effect on the process. This work not only has fundamental significance for understanding the ligand exchange process, but also provides important insights for the application of aromatic ligand-modified QDs in optoelectronic devices.
CHEMISTRY OF MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Ananth Kamath, Richard D. Schaller, Philippe Guyot-Sionnest
Summary: In this work, HgSe/CdSe core/shell quantum dots (QDs) emitting at 1.7 μm were synthesized with a thick shell to increase the photoluminescence quantum yield. The quantum yield was measured to be 63% in nonpolar solvents, indicating the potential for even higher quantum yield when solubilized in water. Our findings highlight the importance of a thick type-I shell for achieving bright emission in the NIR-IIb region.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Chemistry, Multidisciplinary
Julia Nette, Federico Montanarella, Chenglian Zhu, Taras V. V. Sekh, Simon C. C. Boehme, Maryna I. I. Bodnarchuk, Gabriele Raino, Philip D. D. Howes, Maksym V. V. Kovalenko, Andrew J. J. deMello
Summary: The study presents the highly controlled, microfluidic template-assisted self-assembly of CsPbBr3 nanocrystals into spherical supraparticles, achieving precise control over average supraparticle size by varying the nanocrystal concentration and droplet size. This enables the synthesis of highly monodisperse, sub-micron supraparticles (with diameters between 280 and 700 nm).
CHEMICAL COMMUNICATIONS
(2023)
Article
Chemistry, Analytical
Jie-Yu Yue, Li-Ping Song, Xiu-Li Ding, Peng Yang, Yu Ma, Bo Tang
Summary: By employing a multivariate strategy, this study synthesized a series of novel three-component covalent organic frameworks (COF-COOHX) and achieved ratiometric pH detection performance with selectivity and repeatability. The fluorescent properties, linear pH responsive ranges, and pKa values of the COF-COOHX were regulated by tuning the molar ratio of the components. Additionally, the constructed sensors exhibited satisfactory results in pH detection in drug solutions and carbonated drinks.
ANALYTICAL CHEMISTRY
(2022)
Article
Chemistry, Multidisciplinary
Guan Wang, Hao Yu, Liming Yang, Zhentao He, Liangyu Zhou, Jiangman Sun, Xinggui Gu, Wantai Yang, Ben Zhong Tang
Summary: This study developed a novel strategy to construct white-light emitting polymer particles by modulating the aggregation microenvironment during polymer swelling and shrinking, demonstrating the potential for fast anti-counterfeiting in the solid state. This work highlights the importance of aggregation microenvironment in tuning the emission of luminogens and guides the development of high-efficiency emission-tunable materials.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2021)
Article
Chemistry, Physical
Ruihua He, Abdullah Rasmita, Lei Zhou, Liangliang Liang, Xiangbin Cai, Jiaye Chen, Hongbing Cai, Weibo Gao, Xiaogang Liu
Summary: This research reports the observation of superradiance from mesoscopic CsPbBr3 perovskite emitters, which suggests their potential as low-cost quantum light sources.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Article
Chemistry, Physical
Xiunan Zhang, Jingkang Wang, Yue Liu, Yunhui Hao, Fei Yu, Danning Li, Xin Huang, Lu Yu, Ting Wang, Hongxun Hao
Summary: This study achieved tunable emission of organic fluorescent crystals through polymorphic manipulation, revealing the inherent mechanism of different emission and the potential relationship between structure, packing, and function. Results demonstrated that the degree of electron delocalization and overlap of adjacent aromatic systems were responsible for the dissimilar photophysical properties.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Chemistry, Multidisciplinary
Emanuele Marino, Zhiqiao Jiang, Thomas E. Kodger, Christopher B. Murray, Peter Schall
Summary: We assemble semiconductor CdSe nanoplatelets into 2D monolayers at the air/liquid interface, which show nematic order. By controlling the ligand exchange, we can tune the distance between neighboring nanoplatelets without affecting the film topology. Our study explores the assembly of 1D nanowires using depletion interactions and improves the control and understanding of semiconductor nanoplatelet assembly, offering potential for cheaper optoelectronic devices based on charge delocalization.
Article
Chemistry, Multidisciplinary
Hyeonjong Ma, Dongjun Kim, Soo Ik Park, Back Kyu Choi, Gisang Park, Hayeon Baek, Hyocheol Lee, Hyeongseoung Kim, Jong-Sung Yu, Won Chul Lee, Jungwon Park, Jiwoong Yang
Summary: This study reveals the phase transformation of 2D CdSe quantum nanosheets caused by off-stoichiometry, and the progress of the transformation is directly observed by in situ transmission electron microscopy. Experimental and theoretical research shows that electron-beam irradiation can change the stoichiometry of the nanosheets, thereby triggering phase transformation. During the phase transformation, surface atom reconstruction leads to the transition from hexagonal wurtzite to cubic zinc blende structure. This study contributes to the fundamental understanding of phase transformations in 2D quantum-sized semiconductor nanocrystals.
Article
Nanoscience & Nanotechnology
Yang Liu, Yong Zhang
Summary: The capping ligands in perovskite nanocrystals play a crucial role in tuning the luminescence intensity. By ion exchange, the luminescence color of PNCs can be shifted from green to yellow, proposing a dynamic optical encryption strategy. The encoded message is hidden in the green pattern, shown during ion exchange, and erased when the pattern turns completely from green to red.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Chemistry, Physical
Anusri Medda, Avisek Dutta, Sumanta Sain, Srijon Ghosh, Indranil Sarkar, Amitava Patra
Summary: The impact of Cu2+ doping and post-synthetic heat treatment on structural modification and carrier relaxation of CdSe NPLs is studied. It is found that Cu atoms substitutionally replace Cd atoms, resulting in significant photoluminescence quenching and shorter decay time. The influence of doping and heat treatment on carrier relaxation processes is confirmed by fs-TAS study, providing a basis for the design of new optoelectronic devices.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Materials Science, Multidisciplinary
Anastasiya D. Golinskaya, Alexander M. Smirnov, Maria V. Kozlova, Ekaterina V. Zharkova, Roman B. Vasiliev, Vladimir N. Mantsevich, Vladimir S. Dneprovskii
Summary: The study reveals a significant blue shift of charge-transfer photoluminescence spectra in tetrapod-shaped CdTe/CdSe nanocrystals under single-photon excitation, along with direct electron-hole transition photoluminescence lines and tunable photoluminescence across indirect gap. Differential transmission spectra show exciton transitions bleaching from different structural domains of the nanocrystals, confirming the separated excitonic emission bands in photoluminescence spectra. The observed features allow for analysis of possible exciton relaxation channels in the CdTe/CdSe nanocrystals, making nano-tetrapods promising for optoelectronic nanodevices.
RESULTS IN PHYSICS
(2021)
Article
Chemistry, Multidisciplinary
Jia Kong, Wenxin Li, Shixuan Zhao, Jiaxing Zhang, Tianli Yue, Yuefei Wang, Yinqiang Xia, Zhonghong Li
Summary: Researchers have designed a histidine-rich peptide nanoassembly that emits color-tunable fluorescent iridescence in a concentration-encoded mode, showing potential applications in bioimaging and implantable light-emitting devices.
Article
Chemistry, Physical
Dexin Chen, Mengyuan Xu, Yanyue Liu, Rongying Wang, Zhaofeng Zhang, Kang Sun, Ke Tao
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2018)
Article
Chemistry, Multidisciplinary
Yan Liu, Yawen Xu, Xiangshuai Geng, Yingying Huo, Dexin Chen, Kang Sun, Guangdong Zhou, Biqiong Chen, Ke Tao
Article
Materials Science, Biomaterials
Dexin Chen, Daqian Wan, Rongying Wang, Yanyue Liu, Kang Sun, Xiaofeng Tao, Yang Qu, Kerong Dai, Songtao Ai, Ke Tao
ACS BIOMATERIALS SCIENCE & ENGINEERING
(2018)
Article
Materials Science, Biomaterials
Dexin Chen, Daqian Wan, Rongying Wang, Yanyue Liu, Kang Sun, Xiaofeng Tao, Yang Qu, Kerong Dai, Songtao Ai, Ke Tao
ACS BIOMATERIALS SCIENCE & ENGINEERING
(2018)
Article
Chemistry, Multidisciplinary
Yan Liu, Yawen Xu, Zezhong Zhang, Yingying Huo, Dexin Chen, Wei Ma, Kang Sun, Gulen Yesilbag Tonga, Guangdong Zhou, Daniel S. Kohane, Ke Tao
Article
Chemistry, Multidisciplinary
Yan Liu, Yingying Huo, Lin Yao, Yawen Xu, Fanqiang Meng, Haifeng Li, Kang Sun, Guangdong Zhou, Daniel S. Kohane, Ke Tao
Article
Engineering, Biomedical
Jun Xue, Dida Duosiken, Shan Zhong, Jiao-Jiao Cao, Liang-Yun Hu, Kang Sun, Ke Tao, Si-Jian Pan
Summary: Radiosensitization by NaGdF4:Yb,Er nanoparticles was found to be effective even without modification of targeting ligands. The extent of mitochondrial targeting was closely related to sensitization efficiency, which was attributed to the activation of ROS-mediated TNF-JNK pathway and cell cycle arrest by RNA sequencing technique. This study suggests a strategy for enhancing radio-sensitization by utilizing subcellular targeting of nanoparticles.
ACTA BIOMATERIALIA
(2021)
Article
Biochemistry & Molecular Biology
Chu-Hsin Chen, Na Tang, Ke Xue, Hui-Zhong Zhang, Ya-Hong Chen, Peng Xu, Kang Sun, Ke Tao, Kai Liu
Summary: This study conducted tri-modal in vivo imaging of CSPCs using upconversion nanoparticles, enabling real-time quantitative monitoring of implanted cells. However, limitations in the detectable range of cell numbers were observed due to imaging shortcomings of UCNPs, which require further improvement.
Article
Chemistry, Multidisciplinary
Dida Duosiken, Ruihao Yang, Yingfan Dai, Zeinab Marfavi, Quanjie Lv, Hanyin Li, Kang Sun, Ke Tao
Summary: Thulium oxide nanoparticles show potential for generating ROS under NIR stimulation, demonstrating impressive tumor inhibition in photodynamic therapy.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2022)
Article
Chemistry, Multidisciplinary
Yan Liu, Qelger Bao, Zheng Chen, Lin Yao, Zheng Ci, Xiangyu Wei, Yongjie Wu, Jin Zhu, Kang Sun, Guangdong Zhou, Shiting Li, Wei Ma, Ke Tao
Summary: Drug resistance is a major obstacle in cancer therapy, but nanoparticle-based photodynamic therapy shows promise in overcoming this challenge. By targeting multiple resistant pathways and inducing cell apoptosis via downstream genes, this therapy may offer a new approach to combat drug resistance in cancer.
Article
Materials Science, Biomaterials
Na Tang, Xueyi Wang, Jin Zhu, Kang Sun, Shiting Li, Ke Tao
Summary: Research on the use of multi-modal nanoparticles to label stem cells and detect their homing behavior via micro-CT imaging showed a higher homing efficiency of ADSCs in intravenously injected groups and the promoting effect of CXCL 12 on stem cell homing. However, the therapeutic efficacy of CXCL 12 was limited, while intravenous injection of ADSCs did not show significant results.
BIOMATERIALS SCIENCE
(2022)
Article
Chemistry, Multidisciplinary
Yanyue Liu, Yingfan Dai, Haifeng Li, Dida Duosiken, Na Tang, Kang Sun, Ke Tao
Summary: The longitudinal relaxivity of gadolinium oxide nanoparticles is found to be sensitively dependent on the numbers of H+ generated from the surface and in the environment, with nanoparticles of lower crystallinity exhibiting higher relaxivity. The isoelectric point is considered an indicator of longitudinal relaxivity, highlighting the impact of protons dissociated from the contrast agents.
NANOSCALE ADVANCES
(2021)
Article
Engineering, Biomedical
Yan Liu, Xiaodi Wu, Feifan Chen, Hao Li, Tao Wang, Ningning Liu, Kang Sun, Guangdong Zhou, Ke Tao
Summary: In this study, we found that nanoparticle-based photodynamic therapy disrupted the tumor-stroma crosstalk in pancreatic tumor models, leading to persistent inhibition of extracellular matrix secretion and enhanced therapeutic effect. By down-regulating TGF beta signaling pathways, this therapy decreased drug resistance, proliferation, and migration of cancer cells. Furthermore, it inactivated pancreatic stellate cells and hindered ECM secretion. The disruption of tumor-stroma crosstalk also improved tumor penetration in stroma-rich pancreatic tumor models, enhancing subsequent therapy outcomes.
Article
Chemistry, Multidisciplinary
Ran Xu, Fanqiang Meng, Yanyue Liu, Dida Duosiken, Kang Sun, Sijian Pan, Ke Tao
Summary: By controlling the size and lattice distortion of CaF2 nanocrystals, we accelerated their longitudinal relaxation, addressing the issue of unacceptable scanning time in MR imaging.
CHEMICAL COMMUNICATIONS
(2021)
Article
Chemistry, Inorganic & Nuclear
Deng Jie, Li Hai-Feng, Liu Yan, Tang Na, Sun Kang, Tao Ke
CHINESE JOURNAL OF INORGANIC CHEMISTRY
(2019)
