Talanta
School of Chemistry, Physics and Mechanical Engineering, Science and Engineering Faculty, Queensland University of Technology, Brisbane 4001, Australia. Electronic address:
Published: November 2015
Tungsten disulfide (WS2) is a two-dimensional transition metal dichalcogenide, which is of particular interest because it has highly anisotropic bonding, which leads to strongly anisotropic electrical and mechanical properties. Thus, in this work, a simple hydrothermal process was developed to produce photoluminescence from WS2 dots. This was achieved in the presence of sodium tungstate and reduced L-glutathione; the emitted fluorescence produced a quantum yield as high as 0.066. The WS2 dots and the associated fluorescence were investigated with the use of transmission electron microscopy, atomic force microscopy, X-ray photoelectron spectroscopy, Fourier transform infrared and UV-vis spectroscopies. The WS2 dots were used as a fluorescent probe to analyze nitrofurazone (NFZ). The associated fluorescence resonance energy transfer (FRET) mechanism was also investigated and the emitted fluorescence was found to be linear in the range of 0.17-166 μmol L(-1) with a detection limit of 0.055 μmol L(-1). The proposed method was successfully applied for analysis of NFZ in nasal drops and water samples.
Download full-text PDF |
Source |
---|---|
http://dx.doi.org/10.1016/j.talanta.2015.07.055 | DOI Listing |
Int J Biol Macromol
December 2024
Guangxi Key Laboratory of Natural Polymer Chemistry and Physics, College of Chemistry and Materials, Nanning Normal University, Nanning 530001, PR China. Electronic address:
Herein, the intricate molecular interplay between human serum albumin (HSA) and tungsten disulfide quantum dots (WS QDs) was probed using spectroscopic techniques and sophisticated molecular simulation methods. Fluorescence spectroscopy demonstrated that under physiological conditions, WS QDs forge a non-fluorescent ground-state complex with HSA, facilitated by hydrogen bonding and van der Waals forces, ultimately resulting in the static quenching of the protein's intrinsic fluorescence. Complementary site competition experiments and molecular docking simulations reinforced a precise 1: 1 binding stoichiometry, predominantly targeting HSA's Site I.
View Article and Find Full Text PDFNanotechnology
September 2024
Department of Applied Physics, Kyung Hee University, Yongin 17104, Republic of Korea.
Semitransparent solar cells are attracting attention not only for their visual effects but also for their ability to effectively utilize solar energy. Here, we demonstrate a translucent solar cell composed of bis(trifluoromethane sulfonyl)-amide (TFSA)-doped graphene (Gr), graphene quantum dots (GQDs), and LaVO. By introducing a GQDs intermediate layer at the TFSA-Gr/LaVOinterface, we can improve efficiency by preventing carrier recombination and promoting charge collection/separation in the device.
View Article and Find Full Text PDFSpectrochim Acta A Mol Biomol Spectrosc
January 2025
College of Food Science and Technology, Bohai University, National & Local Joint Engineering Research Center of Storage, Processing and Safety Control Technology for Fresh Agricultural and Aquatic Products, Food Safety Key Lab of Liaoning Province, Institute of Ocean Research, The Fresh Food Storage and Processing Technology Research Institute of Liaoning Provincial Universities, Jinzhou, Liaoning 121013, China. Electronic address:
The aptamers functionalized orange-emission carbon dots (OCDs) and green-emission carbon dots (GCDs) had dual-emission peaks with single excitation. Tungsten disulfide nanosheets (WS NSs)-triggered fluorescence quenching achieved the ratiometric fluorescence determination of Escherichia coli O157:H7 (E. coli O157:H7) and Staphylococcus aureus (S.
View Article and Find Full Text PDFAngew Chem Int Ed Engl
January 2025
Key Laboratory of Interfacial Reaction & Sensing Analysis in Universities of Shandong, School of Chemistry and Chemical Engineering, University of Jinan, Jinan, 250022, P. R. China.
Local enrichment of free radicals at the electrode interface may open new opportunities for the development of electrochemiluminescence (ECL) applications. The sensing platform was constructed by assembling ECL-emitting luminol derived carbon dots (Lu CDs) onto the heterojunction Tungsten disulfide/Covalent organic frameworks (WS@COF) for the first time, establishing a nanoconfinement-reactor with significantly heightened ECL intensity and stability compared to the Lu CDs-HO system. This enhanced performance is credited to the COF domain's restricted pore environment, where WS@COF exhibits a more negative adsorption energy for HO, effectively enriching HO in the catalytic edge sites of WS.
View Article and Find Full Text PDFACS Appl Mater Interfaces
June 2024
Institute of Materials Research and Engineering (IMRE), Agency for Science, Technology and Research (A*STAR), 2 Fusionopolis Way, Innovis #08-03, Singapore 138634, Republic of Singapore.
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!
© LitMetric 2025. All rights reserved.