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Luminescence and anion recognition performance of mononuclear Eu(III) complexes with N- and O- donor pyridine derivatives
摘要： A series of Eu(III) complexes with pyridine-2-carboxamide (PCA), pyridine-2-carboxaldoxime (PCAO), pyridine-2,3-dicarboxylic anhydride (PDCA) or pyridine-2-methanol (PM) as primary ligands and 4,4′-dimethoxy-2,2′-bipyridine (DMBP) as ancillary ligand were synthesized. The interaction between the ligands and complexes were confirmed by FT-IR study. The complexes were abbreviated as [Eu(PCA)3DMBP].Cl3 (C1), [Eu(PCAO)3DMBP].Cl3 (C2), [Eu(PDCA)3DMBP].Cl3 (C3) and [Eu(PM)3DMBP].Cl3 (C4). Optical studies were done by UV–vis spectroscopy and PL spectroscopy. The highest intrinsic luminescent quantum yield (53.42%) and lifetime value (1456 μs) were found for C3. Lowest quantum yield was exhibited by C2. Anion sensing studies of all the complexes were done by UV–vis and PL spectroscopy and it was observed that complex C1 showed remarkable change in optical properties upon addition of F? and HSO4? ions. Thus C1 can be used as optical sensor for F? and HSO4? ions. The FQD for F? and HSO4? ions were found to be 6.55 and 3.58 respectively for C1.
关键词： Sensing performance,Antenna effect,Hydrogen bonding,Optical sensor,Lifetime decay
更新于2025-11-21 11:18:25
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Sub-ppm level NO2 sensing properties of polyethyleneimine-mediated WO3 nanoparticles synthesized by a one-pot hydrothermal method
摘要： A novel sensing material of polyethyleneimine-mediated WO3 nanoparticles was prepared by a simple and efficient one-pot hydrothermal method. The structure and morphology characteristics of the as-prepared WO3 nanoparticles were investigated by X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS) and Fourier transform infrared spectroscopy (FTIR). The results showed that the as-prepared WO3 nanomaterials were composed of highly dispersible WO3 nanoparticles, and these nanoparticles with the particle size in the range of 10e50 nm showed a monoclinic structure. NO2 sensing measurements demonstrated that WO3 nanoparticles-based gas sensor exhibited superior response, outstanding selectivity, excellent reversibility, and good long-term stability. The sensor response increased as NO2 concentration increased. The highest response value of 251.7 was achieved to 5 ppm NO2 at the optimal operating temperature of 100 (cid:1)C. Especially, the sensor response could reach 3.2e50 ppb NO2. It also exhibited fast response and recovery times with a high sensor response even in a high-humidity environment. The excellent gas sensing properties of WO3 nanoparticles could be ascribed to their high effective surface areas as well as numerous oxygen vacancies, which foresee the great potential application for fast and effective detection of sub-ppm level NO2 under different humidity environments.
关键词： Nanoparticles,NO2,Gas sensing performance,WO3,Hydrothermal
更新于2025-09-23 15:23:52
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Ultrafast methanol sensing properties of nano-spindle like In2O3 hierarchical structures with oxygen vacancies
摘要： Unique nano-spindle like In2O3 hierarchical structures have been successfully prepared using a simplified solvothermal method. The micromorphology and crystalline structure of the as-obtained are characterized by SEM, TEM, and XRD. Morphology analysis reveals that the nano-spindle like In2O3 hierarchical structures are composed of numerous ordered nanorods. The optical properties of the samples are also studied, and it is confirmed that the presence of a large amount of oxygen vacancies in the as-synthesized samples. The as-synthesized nano-spindle like In2O3 hierarchical structures are used for the detection of the methanol gas. The sensing properties of the as-manufactured sensor are carefully discussed and the sensor shows outstanding methanol sensing performance, especially ultrafast response time (<1 s). The sensing mechanism is also discussed. This work offers the possibility to manufacture low-cost, high-performance methanol sensor based on the as-synthesized nano-spindle like In2O3 hierarchical structures.
关键词： Oxygen vacancies,Methanol sensing performance,Hierarchical structures,Nano-spindle like In2O3
更新于2025-09-23 15:22:29
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[IEEE 2018 IEEE SENSORS - New Delhi, India (2018.10.28-2018.10.31)] 2018 IEEE SENSORS - Hierarchical MnO<inf>2</inf> Nanoflowers Based Efficient Room Temperature Alcohol Sensor
摘要： In the present work, hierarchical 3-D MnO2 nanoflowers (consisting of 2D nanosheets) were synthesized employing hydrothermal technique and subsequently alcohol sensing performance of the MnO2 NFs was investigated. The morphological (FESEM, Transmission Electron Microscopy), and surface compositional (X-ray Photoelectron Spectroscopy) characterizations were carried out. Lattice fringe of TEM image confirmed that constituents of 3-D nanoflower to be birnessite (i.e. δ-MnO2) 2-D nanosheets. In addition, core level XPS spectra validated the presence of mixed valence state of Mn (i.e. Mn3+ and Mn4+states) in the MnO2 NFs. Further, Electrochemical Impedance Spectroscopy measurement (Mott Schottky analysis) revealed that the n-type conductivity of MnO2 NFs based sensing layer. It is clearly observed from the transient response characteristics that the device offered promising room temperature sensing performance towards alcohols (i.e. methanol, ethanol and 2-propanol). However, the device offered better sensing performance towards methanol than that of ethanol and 2-propanol. The response time and recovery time of the sensor also found to be moderately fast at room temperature. Interestingly, the device resistance was increased in presence of reducing vapor (although MnO2 NFs is a n-type material).
关键词： Birnessite (i.e. δ-MnO2),Room temperature Alcohol sensor,Anomalous gas sensing performance,Hierarchical 3-D MnO2 nanoflowers
更新于2025-09-19 17:15:36
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Polymeric Micelles Encapsulating a Small Molecule SO <sub/>2</sub> Fluorescent Probe Exhibiting Novel Analytical Performance and Enhanced Cellular Imaging Ability
摘要： Because of the limited knowledge on the relationship between molecular structure and analytical performance, developing a small molecule fluorescent probe with desirable response properties is usually a laborious work. On the other hand, the application of small molecule fluorescent probe in biological samples is always limited due to the unwanted interaction between dyes and biomacromolecules. Polymer micelles, thanks to its unique core?shell structure, may have the potential to improve these situations. However, utilization of polymer micelles to improve these situations is rarely explored. Herein, we engineered the first micellar SO2 nanoprobe Nano-Cz by self-assembly of a carbazole-based SO2 small molecule probe and an amphiphilic copolymer (DSPE-mPEG2000). The optical and cell imaging experiments revealed that Nano-Cz can work in 100% aqueous environment and act as an effective mitochondrial-targeting ratio SO2 nanoprobe. Compared with the single small molecule probe, Nano-Cz showed extraordinary large dynamic response range (0?0.7 mM vs 0?50 μM), eliminated signal interference from DNA and superior cellular imaging performance. These results clearly show the ability of polymer micelles in modulating sensors’ analytical performance and reducing the signal interference from the unwanted interaction between small molecule probe and biomacromolecule, indicating that polymer micelles encapsulating single small molecule probe can provide us an alternative strategy to explore sensors with various performance and promote the biological application of fluorescent sensors. In addition, we hope that more and more polymer micelles would be used to construct biosensors in the future.
关键词： sensing performance,biological application,sulfur dioxide,polymer micelles,fluorescent sensor
更新于2025-09-04 15:30:14