Article
Chemistry, Physical
Ziqiang Sun, Cheng Liu, Hongchao Yang, Xiaohu Yang, Yejun Zhang, Hongzhen Lin, Youyong Li, Qiangbin Wang
Summary: The surface ligands of colloidal quantum dots (QDs) play a significant role in their surface properties. In this study, the effect of ligand chain length on Ag2Se QDs was investigated, and it was found that the PL intensity increased with shorter ligand chains. AgAuSe QDs with high PL quantum yield were obtained through alloying, enabling ultrasensitive in vivo angiography imaging.
Article
Chemistry, Multidisciplinary
Yongsheng Yang, Bingli Gu, Zhiduo Liu, Da Chen, Yun Zhao, Qinglei Guo, Gang Wang
Summary: Doped carbon-based materials have unique optical, thermal, and electronic properties, and a facile method involving hydrothermal treatment of citric acid and phosphonitrilic chloride trimer was demonstrated for the synthesis of nitrogen and phosphorus co-doped graphene quantum dots. The obtained N, P-GQDs show bright yellow fluorescence, good solubility, and can be selectively quenched by Fe3+ ions, leading to the fabrication of high-performance Fe3+ sensors with ultra-sensitive detection limit. The fluorescence intensity of N, P-GQDs is minimally affected by high ionic strength, mild acids, and alkaline conditions, making them suitable for bioimaging applications.
JOURNAL OF NANOPARTICLE RESEARCH
(2021)
Article
Biochemistry & Molecular Biology
Bruno Peixoto de Oliveira, Nathalia Uchoa de Castro Bessa, Joice Farias do Nascimento, Carolina Sidrim de Paula Cavalcante, Raquel Oliveira dos Santos Fontenelle, Flavia Oliveira Monteiro da Silva Abreu
Summary: In this work, chitosan was used as a raw material to synthesize carbon dots through fast microwave carbonization. The synthesis time, doping agent, and molar ratio of reactants were investigated for their influence on the quantum yield of carbon dots. Chitosan-based carbon dots exhibited stable blue fluorescence emission with excitation-dependent behavior and quantum yield values ranging from 1.16 to 7.07%. ANOVA results indicated that the interaction factor between the doping agent and molar ratio of reactants was a significant combination for producing carbon dots with higher quantum yield. The presence of the doping agent improved the optical properties of carbon dots by enhancing fluorescence intensity. Confocal laser microscope images showed that the carbon dots internalized in the Candida albicans cellular membrane, displaying blue, green, and red emissions, which showed promise for bioimaging.
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
(2023)
Article
Biochemistry & Molecular Biology
Ilia Litvinov, Anna Salova, Nikolay Aksenov, Elena Kornilova, Tatiana Belyaeva
Summary: In this study, the photophysical characteristics of core/shell InP/ZnS quantum dots (InP-QDs) were analyzed in cell culture medium, salt solutions, and directly in the cells. It was found that InP-QDs were internalized into endolysosomes in HeLa and A549 cells with similar dynamics to Cd-based QDs, but the two cell lines accumulated them differently. InP-QDs were reliably detected in the endosomes despite their low quantum yields. Factors such as cell culture medium, acidic pH, and salt solutions were found to affect the photoluminescence lifetime of InP-QDs. The scatter between endosomes in the same cell was observed, indicating the complex impact of these factors on the state of InP-QDs. The toxicity of InP-QDs for both cell lines at concentrations higher than 20 nM was demonstrated.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2023)
Article
Chemistry, Physical
Federico Fiori, Hind Moukham, Federico Olia, Davide Piras, Sergio Ledda, Andrea Salis, Luigi Stagi, Luca Malfatti, Plinio Innocenzi
Summary: This study synthesized two carbon dots and tested their cellular uptake and bioimaging performance in vitro. The results showed that these carbon dots are highly biocompatible, exhibit high photostability, and can effectively be taken up by cells for bioimaging purposes.
Article
Chemistry, Multidisciplinary
Francesca Limosani, Elvira Maria Bauer, Daniele Cecchetti, Stefano Biagioni, Viviana Orlando, Roberto Pizzoferrato, Paolo Prosposito, Marilena Carbone
Summary: In this study, N-doped carbon quantum dots were successfully synthesized using a top-down approach, with size control and -NH2 functionalization. These N-CQDs exhibited good selectivity and labeling ability in metal ion detection and bioimaging.
Review
Chemistry, Multidisciplinary
Thomas C. Wareing, Piergiorgio Gentile, Anh N. Phan
Summary: Carbon dots are regarded as a solution to the challenges faced by semiconductor quantum dots due to their high biocompatibility and ability to be synthesized from abundant and non-toxic biomass materials. In the biomedical field, biomass-based carbon dots hold great potential for research, especially in terms of synthesis and application, showing promising future development prospects.
Article
Crystallography
Shih-Fu Ou, Ya-Yun Zheng, Sin-Jen Lee, Shyi-Tien Chen, Chien-Hui Wu, Chien-Te Hsieh, Ruey-Shin Juang, Pei-Zhen Peng, Yi-Huang Hsueh
Summary: N-doped carbon quantum dots were synthesized using the hydrothermal method, and were found to be capable of fluorescently staining bacteria with better light stability and photobleaching resistance. They can emit light at both red and green wavelengths when excited at two different wavelengths, making them ideal for bioimaging. Additionally, they can specifically stain bacterial cell membranes and serve as a cost-effective and bio-friendly alternative.
Article
Environmental Sciences
Trisita Ghosh, Suvendu Nandi, Swarup Krishna Bhattacharyya, Suman Kumar Ghosh, Mahitosh Mandal, Pallab Banerji, Narayan Ch Das
Summary: This study developed photoluminescent heteroatom-doped carbon dots for cancer cell imaging through a simple hydrothermal procedure. The carbon dots exhibited spherical shape with an average diameter of 3.5 nm. They showed low cytotoxicity and good compatibility with normal glial cells, and were able to emit green fluorescence inside cells with imaging-trackable ability.
ENVIRONMENTAL RESEARCH
(2023)
Review
Chemistry, Analytical
Likang Zhang, Xue Yang, Zhifu Yin, Linlin Sun
Summary: This review provides an overview of the characteristics, synthesis methods, major applications, and future prospects of carbon quantum dots (CQDs).
Article
Chemistry, Inorganic & Nuclear
Chuqiao Wu, Shuting Zhang, Yuhui Zheng, Aiqi Wang, Qiming Zhao, Wenjie Sun, Wanqiang Liu, Chenggang Long, Qianming Wang
Summary: In this article, a solvent-type passivation (STP) strategy is introduced to achieve better control and reproducibility of sulfur dots by using short-chain molecular species instead of polyethylene glycol (PEG) as the capping agent. The strategy does not require PEG or any other capping agent, and the surface defects of sulfur dots are passivated by sodium ethoxide generated through the direct reaction of ethanol with NaOH. The sulfur dots obtained through this strategy show self-quenching resistant feature in the solid state and an extended fluorescence band up to 645 nm.
INORGANIC CHEMISTRY
(2022)
Article
Spectroscopy
Qin Wang, Zhihua Tang, Lihua Li, Jinxiu Guo, Lingxia Jin, Jiufu Lu, Pei Huang, Shengrui Zhang, Long Jiao
Summary: This study reported a new fluorescent carbon dot-based nanothermometer for sensing temperature changes in living cells. The nanothermometer exhibited high temperature stability, reversibility, and photo-thermo stability. It showed intelligent response to external temperature changes.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2022)
Article
Chemistry, Inorganic & Nuclear
Tianju Chen, Qi Yang, Peng Zhang, Ruihao Chen, Yuke Lin, Weifang Zhou, Laizhi Sui, Xuan Zheng, Guoliang Chen, Feiming Li
Summary: To address the instability of colloidal cesium lead halide perovskite nanocrystals (CsPbX3 PNCs), a stapled ligand called perfluoroglutaric acid (PFGA) is proposed to effectively passivate the surface of CsPbBr3 PNCs. The PFGA-capped CsPbBr3 PNCs exhibit high photoluminescence quantum yield, outstanding dispersion in polar solvents, and excellent stability after rigorous washing and long-term storage. These findings provide insight into surface engineering strategies for producing highly emissive and stable PNCs and broadening their sensing applications in polar media.
INORGANIC CHEMISTRY FRONTIERS
(2023)
Article
Materials Science, Multidisciplinary
Mengna Zhang, Xiang Long, Yanshun Ma, Shaogui Wu
Summary: Super bright fluorescent carbon dots (S-CDs) with photoluminescence quantum yields (PLQY) up to 100% were synthesized by the hydrothermal method using citric acid and ethylenediamine. These S-CDs outperformed all the fluorescent carbon dots reported so far. The study found that the carbonization/graphitization degree had little impact on the PLQY of S-CDs and that they did not possess graphene cores. The S-CDs exhibited excitation wavelength-independent emission behavior, suggesting an exclusive emission center/fluorophore that is not affected by quantum size effect. The study proposed that S-CDs are copolymers of CA and EDA and provided a possible reaction mechanism for their synthesis.
Article
Polymer Science
Yuxiang Jiang, Chunyu Ji, Jiajia Wu, Qiurui Han, Chen Cui, Wenquan Shi, Zhili Peng
Summary: Despite their wide applications, the synthesis and photoluminescence mechanism of carbon dots (C-dots) have received less attention, limiting their further developments. In this study, C-dots were prepared from polyethylene glycol (PEG) with different molecular weights (M.W.), and the effects of PEG M.W. on the formation, structure, and optical properties of C-dots were carefully investigated. It was found that the particle sizes, fluorescence intensities, surface chemistry, thermal stability, and bioimaging capabilities of C-dots were significantly influenced by the PEG M.W. Moreover, these C-dots showed low cytotoxicity and promising potential for cellular bioimaging.
Article
Materials Science, Multidisciplinary
Hong-Xu Chen, Hui Xu, Zhi-Rong Song, Yi Liu, Hui Cui, Jun-Kuo Gao
Summary: This study presents a novel approach to synthesizing carbon nanotubes by applying physical pressure and then pyrolyzing. The introduction of pressure not only improves the morphology of the catalysts, but also enhances the activity for oxygen and hydrogen reactions in alkaline solution.
Article
Chemistry, Multidisciplinary
Fan Huang, Xu Zhang, Weiwei Liu, Junkuo Gao, Lu Sun
Summary: Selective adsorption of N-2, CO2, and CH4 on MIL-100 was studied, and Cr-4, Sc-1, and Fe-6 were found to be promising adsorbents. The adsorption mechanism revealed that electrostatic interactions dominate the adsorption of CO2 and N-2, while van der Waals forces play a significant role in CH4 adsorption.
CHEMISTRY-AN ASIAN JOURNAL
(2023)
Article
Chemistry, Inorganic & Nuclear
Yi Zhang, Jinjun Wu, Junkuo Gao, Xiaohu Chen, Qibiao Wang, Xianglin Yu, Zihe Zhang, Maosong Liu, Junbo Li
Summary: Three COFs with different oxygen ether chains were synthesized and their fluorescence performance and water detection ability in different solvents were studied.
JOURNAL OF SOLID STATE CHEMISTRY
(2023)
Article
Chemistry, Multidisciplinary
Shiyu Nie, Fengfeng Chen, Tianbo Shen, Tingting Wang, Ningyu Di, Junkuo Gao
Summary: Adjusting the internal porous environment of MOFs to enhance their adsorption properties is considered an effective strategy to improve their gas separation performance. In this study, UiO-66 was encapsulated with 1-ethyl-3-methyl-imidazolium acetate ([Emim][Ac]) to improve CO2 capture performance. The [Emim][Ac]@UiO-66 exhibited higher CO2 adsorption capacity and selectivity compared to the original UiO-66, indicating its potential as an efficient absorbent for gas separations.
NEW JOURNAL OF CHEMISTRY
(2023)
Article
Chemistry, Multidisciplinary
Usman Khan, Adeela Nairan, Karim Khan, Sean Li, Bilu Liu, Junkuo Gao
Summary: A low-temperature salt-assisted chemical vapor deposition method was used to grow single-domain Bi2O2Se on a millimeter scale with multilayer to monolayer thickness. The layer-dependent Raman spectroscopy of Bi2O2Se was systematically investigated, showing a redshift of the A(1g) mode at 162.4 cm(-1). The environmental stability of approximately 2.4 nm thick Bi2O2Se was confirmed after exposure to air for 1.5 years. The backgated field effect transistor based on a few-layered Bi2O2Se exhibited decent carrier mobility (approximately 287 cm(2) V(-1)s(-1)) and an ON/OFF ratio of up to 10(7), indicating a technique for growing large-domain thickness controlled Bi2O2Se single crystals for electronics.
Review
Chemistry, Inorganic & Nuclear
Haiming Yang, Linhao Xue, Xiaogang Yang, Hui Xu, Junkuo Gao
Summary: Natural gas, as an essential chemical raw material and a promising clean energy source, is in high demand. Metal-organic frameworks (MOFs), a type of porous materials, have shown great potential for gas separation and purification due to their unique properties. This article summarizes the recent research progress of using MOFs as adsorbents for the separation of different gases in natural gas and discusses future research directions.
CHINESE JOURNAL OF STRUCTURAL CHEMISTRY
(2023)
Article
Chemistry, Inorganic & Nuclear
Ruiming Zheng, Zhirong Song, Di Chen, Zhuo Feng, Junkuo Gao, Usman Khan
Summary: Preparing high-efficiency, durable and low overpotential electrocatalytic materials is crucial for the oxygen evolution reaction (OER) in water electrolysis. Electrochemical water separation technology has become the most promising method for sustainable hydrogen production. The inherent hysteresis kinetics of OER is the main bottleneck for water electrolysis, restricting energy conversion efficiency and large-scale application. In this study, a facile method is developed to synthesize trimetallic metal-organic frameworks (MOFs)-derived carbon nanoparticles (CNPs) with varying Fe content. The optimized MoNiFe0.4-CNPs exhibit superior electrocatalytic performance with a low overpotential and excellent durability, attributed to the synergistic effect of Fe/Ni bimetallic regulated by Mo. This work improves the catalytic performance of MOFs in OER and proposes a new strategy for MOFs structural design.
ZEITSCHRIFT FUR ANORGANISCHE UND ALLGEMEINE CHEMIE
(2023)
Article
Chemistry, Physical
Huan He, Xusheng Wang, Qin Yu, Wenbin Wu, Xinya Feng, Deyu Kong, Xiaohui Ren, Junkuo Gao
Summary: Ti3C2/UiO-66-NH2 composites with different ratios of Ti3C2 were synthesized via an in situ solvothermal process and used for the enhanced photocatalytic removal of Cr(VI) for the first time. The strong interfacial interaction between Ti3C2 and UiO-66-NH2 and the formed depletion layer are beneficial for efficient charge transfer and suppressing charge recombination. The Ti3C2/UiO-66-NH2 composites exhibited better photoreduction efficiency of Cr2O72- than pure Ti3C2 and UiO-66-NH2, with optimized samples reaching 100% in 40 min.
Article
Chemistry, Multidisciplinary
Youlie Cai, Junkuo Gao, Jing-Hong Li, Puxu Liu, Yanchun Zheng, Wei Zhou, Hui Wu, Libo Li, Rui-Biao Lin, Banglin Chen
Summary: By incorporating structure-directing agents (SDAs) into the hydrogen-bonding network of TCPP, a series of HOFs with different pore structures were obtained. Among them, HOF-ZSTU-2 forms a strong layered hydrogen-bonding network with ammonium (NH4+) through multiple carboxyl groups and has a suitable 1D pearl-chain channel for the selective capture of propylene (C3H6). HOF-ZSTU-2 achieves a C3H6 storage density of 0.6 kg L-1 at 298 K and 1 bar, and exhibits a propylene/propane (C3H6/C3H8) selectivity of 12.2.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Letter
Materials Science, Multidisciplinary
Tao Zhao, Yu-Hang Wu, Zhi-Rong Song, Xue Wang, Rui-Lian Yin, Hui Xu, Hui Cui, Xie-Hong Cao, Jun-Kuo Gao
Review
Chemistry, Inorganic & Nuclear
Yangdan Pan, Reza Abazari, Beenish Tahir, Soheila Sanati, Yanchun Zheng, Muhammad Tahir, Junkuo Gao
Summary: Photocatalysis, or photo-electrocatalysis technology, offers a clean and renewable solution to our urgent energy crisis and environmental challenges. Metal-organic frameworks (MOFs), especially Fe-containing MOFs (Fe-MOFs), demonstrate advantages such as low cost, low toxicity, and stable performance, making them highly promising for photocatalysis applications.
COORDINATION CHEMISTRY REVIEWS
(2024)
Article
Chemistry, Inorganic & Nuclear
Wenxin Lin, Yijia Wang, Haoke Zhang, Kei Hoi Shan, Panpan Si, Shijiang Yu, Zhen Wang, Dian Zhao, Junkuo Gao, Minghua Wu, Ben Zhong Tang
Summary: A novel metal-organic framework with strong fluorescence was synthesized and showed ideal luminescent property in water. It exhibited differential fluorescent response to different types of amino acids, providing a potential strategy for designing MOF-based sensors for biomolecules.
DALTON TRANSACTIONS
(2023)
Article
Chemistry, Inorganic & Nuclear
Wenxin Lin, Yijia Wang, Haoke Zhang, Kei Hoi Shan, Panpan Si, Shijiang Yu, Zhen Wang, Dian Zhao, Junkuo Gao, Minghua Wu, Ben Zhong Tang
Summary: A novel metal-organic framework Zn-PBC was synthesized and exhibited strong fluorescence. It showed differential fluorescent response to different types of amino acids, potentially providing a strategy to design MOF-based sensors for biomolecules in future.
DALTON TRANSACTIONS
(2023)
Article
Chemistry, Physical
Yuwen Li, Yuhang Wu, Tongtong Li, Mengting Lu, Yi Chen, Yuanjing Cui, Junkuo Gao, Guodong Qian
Summary: The study introduces a durable metal-organic framework with atomically dispersed ruthenium and optimized electronic structure as an efficient electrocatalyst for oxygen evolution. The catalyst shows ultrahigh Ru mass activity and remains stable for over 300 hours, demonstrating significant potential for practical applications in improving electrocatalytic performance.
Review
Chemistry, Physical
Usman Khan, Adeela Nairan, Junkuo Gao, Qichun Zhang
Summary: 2D nanosheets of metal-organic frameworks (MOFs) have shown great potential in electrocatalytic fields due to their atomic-level thickness, abundant active sites, and large surface area. This review summarizes the synthesis and electrocatalytic applications of 2D MOFs for hydrogen evolution reaction, oxygen evolution reaction, and overall water splitting. The focus is on the synthetic strategies and properties of these materials, highlighting their catalytic performance and unique advantages. The challenges in this field and potential solutions are also discussed.
