Latest ArticlesThe core-shell structured Au@Bi2S3 nanorods have been prepared through direct in-situ growth of Bi2S3 at the surface of pre-synthesized gold nanorods. The product was characterized by X-ray diffraction, transmission electron microscopy and energy-dispersive X-ray spectroscopy. Then the obtained Au@Bi2S3 nanorods were coated onto glassy carbon electrode to act as a scaffold for fabrication of electrochemical DNA biosensor on the basis of the coordination of -NH2 modified on 5'-end of probe DNA and Au@Bi2S3. Electrochemical characterization assays demonstrate that the Au@Bi2S3 nanorods behave as an excellent electronic transport channel to promote the electron transfer kinetics and increase the effective surface area by their nanosize effect. The hybridization experiments reveal that the Au@Bi2S3 matrix-based DNA biosensor is capable of recognizing complementary DNA over a wide concentration ranging from 10 fmol/L to 1 nmol/L. The limit of detection was estimated to be 2 fmol/L (S/N=3). The biosensor also presents remarkable selectivity to distinguish fully complementary sequences from basemismatched and non-complementary ones, showing great promising in practical application.
An electrochemical sensor for doxycycline hyclate (DC) detection with high sensitivity and good selectivity is reported. The sensor was fabricated by electro-polymerization of molecularly imprinted polymers (MIPs) in the presence of DC onto multi-walled carbon nanotubes modified glassy carbon electrode (MWCNTs/GCE). The MWCNTs can significantly increase the current response of the sensor, leading to enhanced sensitivity. The MIPs provide selective recognition sites for DC detection. The experimental parameters, such as the polymer monomer concentration, supporting electrolyte pH, the time for electro-polymerization and the incubation time of the sensor with DC were optimized. Under optimized experimental conditions, the sensor displayed a linear range of 0.05 μmol/L-0.5 μmol/L towards DC detection, with the detection limit of 1.3×10-2 μmol/L. The sensor was successfully applied for recovery test of DC in human serum samples.
In clinical cancer research, it is quite promising to develop multimodal synergistic therapeutic strategies. Photodynamic and photothermal synergistic therapy is a very desirable multimodal therapy strategy. Herein, we report a facile and simple method to construct a nanotherapeutic agent for photodynamic and photothermal therapy. This nanotherapeutic agent (ZnO@Ce6-PDA) is composed of a ZnO nanoparticle core, an interlayer of photosensitizer chlorin e6 (Ce6) and an outer layer of polydopamine (PDA). Due to the existence of Ce6, the ZnO@Ce6-PDA can efficiently generate singlet oxygen (1O2) under 660 nm laser irradiation. Moreover, the ZnO@Ce6-PDA can serve as a photothermal agent, because of the excellent photothermal conversion efficiency of the PDA coating layer in the presence of 780 nm laser. Experiment results demonstrated that the designed nanotherapeutic agent had outstanding phototoxicity upon the combination of laser irradiation at 660 and 780 nm. Thus, our work proves that the ZnO@Ce6-PDA is a promising photodynamic/photothermal dual-modal nanotherapeutic agent for enhanced cancer therapy.
A novel channel-wall engineering strategy of the porous materials cationic covalent organic frameworks (COFs) is established based on rapid microwave-assisted anion exchange reaction and utilized to prepare a set of new COFs. Due to the interaction between the carbon dioxide (CO2) and the acetate anion, the resulting SJTU-COF-AcO shows greatly enhanced carbon dioxide capacity up to 1.7 times of the pristine COF. The effect of the counter anions to CO2 capacity in the cationic COFs is investigated for the first time, which demonstrates that our channel-wall engineering strategy is a promising way to tailor the property of COFs for high CO2 capacity.
Three new rare cyclopiane diterpenes (1-3), together with thirteen known compounds (4-16), were isolated and identified from a sea sediment-derived fungus Penicillium sp. TJ403-2. The planar and relative structures of compounds 1-3 were elucidated by HRESIMS, one- and two-dimensional NMR analyses, and their absolute configurations were further established by X-ray crystallography experiment. Compounds 1-3 were evaluated for the antiinflammatory activity against LPS-induced NO production, and compound 1 showed notable inhibitory potency with an IC50 value of 2.19±0.25 μmol/L, which was three fold lower than the positive control indomethacin (IC50=8.76±0.92 μmol/L). Further Western blot and immunofluorescence experiments demonstrated its mechanism of action to be that 1 inhibited the NF-ΚB-activated pathway, highlighting it as a promising starting point for the development of new antiinflammatory agents.
Gold nanoparticles functionalized hollow mesoporous Prussian blue nanoparticles (Au@HMPB NPs) were synthesized and its peroxidase-like activity was explored for electrochemical probe. The Au@HMPB NPs can reduce H2O2 at low detection potential of -0.1 V with high sensitivity. After physically adsorption of antibodies onto the gold nanoparticle surface, the functionalized nanoparticles were turned into immuno-probe. The soluble α-chain of interleukin-2 (IL-2) receptor (sCD25) was chosen as a model protein biomarker to test the performance of the probe. sCD25 in the samples were captured and enriched by capture anti-CD25 antibody functionalized magnetic nanospheres. Detection antibody functionalized Au@HMPB can then be linked onto the nanospheres and generate electrochemical current towards H2O2 reduction. The electrochemical responses to 1 mmol/L H2O2 was increased with the increasing concentration of CD25.
Interfacial electron transfer between electroactive biofilm and the electrode was crucial step for microbial fuel cells (MFCs). A three-dimensional multilayer porous sponge coating with nitrogen-doped carbon nanotube/polyaniline/manganese dioxide (S/N-CNT/PANI/MnO2) electrode has been developed for MFC anode. Here, the S/N-CNT/PANI/MnO2 anode can function as a biocapacitor, able to store electrons generated from the degradation of organic substrate under the open circuit state and release the accumulated electrons upon requirement. Thus, the mismatching of the production and demand of the electricity can be overcome. Comparing with the sponge/nitrogen-doped carbon nanotube (S/N-CNT) bioanode, S/N-CNT/PANI/MnO2 capacitive bioanode displays a strong interaction with the microbial biofilm, advancing the electron transfer from exoelectrogens to the bioanode. The maximum power density of MFC with S/N-CNT/PANI/MnO2 capacitive bioanode is 1019.5 mW/m2, which is 2.2 and 5.8 times as much as that of S/N-CNT/MnO2 bioanode and S/N-CNT bioanode (470.7 mW/m2 and 176.6 mW/m2), respectively. During the chronoamperometric experiment with 60 min of charging and 20 min of discharging, the S/N-CNT/PANI/MnO2 capacitive bioanode was able to store 10743.9 C/m2, whereas the S/N-CNT anode was only able to store 3323.4 C/m2. With a capacitive bioanode, it is possible to use the MFC simultaneously for production and storage of electricity
Recently, the development of new electrode materials for lithium-ion batteries (LIBs) has received intensive attention. As an important family of inorganic materials, mixed Mo-based transition metal oxides system is focused as anode materials. In the present work, a simple route has been adopted for the synthesis of layered-flake-like β-SnMoO4 Nano-assemblies, which have been explored as potential anode materials for the first time in lithium-ion battery (LIB). Overall, the current reports on metal molybdate as anode materials are still rarely. As the anode material for LIBs, it was observed that the fabricated anode is capable of delivering a steady state capacity of almost 400 mAh/g up to 300 cycles under the influence of 200 mA/g current density. Further, the anode material is suitable for use as a rated capacity anode because of its high current density tolerance. The present study can be further extended for the generation of a wide variety of other novel materials for multidisciplinary energy related applications.
Hard carbon is regarded as promising anode materials for potassium-ion batteries (KIBs) owing to their low price and easy availability. However, the limited rate capability still needs to be improved. Herein, we demonstrate the fabrication of oxygen/sulfur co-doped hard carbon through a facile hydrolyzationsulfuration process of skimmed cotton. The simultaneous dopants significantly improve potassium ion diffusion rate. When served as the anode for KIBs, this hydrolyzed hard carbon delivered a high reversible capacity (409 mAh/g at 0.1 A/g), superior rate capability (135 mAh/g at 2 A/g) and excellent cyclability (about 120 mAh/g overt 500 cycles at 2 A/g). This work provides a facile strategy to prepare low-cost doped-hard carbon with superior potassium storage property.
Hard carbon is promising anode for potassium-ion batteries (PIBs), however, the poor rate capability hinders its development as potential anode. To address this question, we design a sulfur-doped porous hard carbon (S-HC) for PIBs through the combination of structural design and composition adjustment. The as-designed S-HC exhibits a long cycling life with ~191 mAh/g after 300 cycles at 1 A/g, and an excellent rate capability with ~100 mAh/g at 5 A/g, which was attributed to its structural characteristics and compositions. The S-HC demonstrates to be promising anode in the future.
No. 86 Xueyuan South Road, Haidian District, Beijing
010-62662699(Operation and Technical Support)
qkjq@cast.org.cn
Copyright © 2025 China Association for Science and Technology. All rights reserved. For all open access content, the relevant licensing terms apply.
Sponsored by the Office of the Leading Group for Cybersecurity and Informatization of CAST, and supported by Science and Technology Review Publishing House
