Low-toxicity, highly luminescent, and water-soluble AgInS2/ZnS nanocrystals (NCs) have been synthesized via a microwave-assisted approach. The structure and optical features of the AgInS2/ZnS NCs were characterized by X-ray diffraction, high resolution transmission electron microscopy, Fourier transform infrared spectroscopy, ultraviolet visible absorption spectroscopy and photoluminescence (PL) spectroscopy. The as-synthesized AgInS2/ZnS NCs exhibited high PL quantum yields (40%) and long PL lifetimes (424.5 ns). Furthermore, the dynamic changes of the intracellular copper(II) levels in HeLa cells were monitored using the AgInS2/ZnS NCs as fluorescent probes. The results showed that the AgInS2/ZnS NCs as promising fluorescent probes can be used in the detection of intracellular copper ions in living cells.
In this Article, we present a facile microwave-assisted synthesis route for the preparation of water-soluble and high-quality CuInS2/ZnS nanocrystals (NCs) with glutathione as the stabilizer. The as-prepared CuInS2/ZnS NCs exhibited small particle sizes (∼3.3 nm), long photoluminescence lifetimes, and color-tunable properties ranging from the visible to the near-infrared by varying the initial ratio of Cu/In in the precursors. The low-toxicity, highly luminescent and biocompatible CuInS2/ZnS NCs were applied to cell imaging, showing that they could be used as promising fluorescent probes. Furthermore, the CuInS2/ZnS NCs were used as the signal labels for a fluoroimmunoassay of the biomarker IL-6, showing their great potential for use as reliable point-of-care diagnostics for biomarkers of cancer and other diseases.
For a cool 320240 detector with staring focal plane array, an dual field of view infrared system for middle wavelength is designed. The system using positive electromechanical athermalization technology employs the axial motion of a lens group along the optical axis to change fields. The optical simulation and image evaluation are listed. The design results prove that the system had eight lens and worked at 3.7~4.8m has achieved the zoom of 50mm and 200mm, and satisfy 100% cold shield efficiency. The modulation transfer function is all above 0.5 at the Nyquist frequency when the temperature is between -50 and 60. The system is characterized by excellent images, simple structure and athermalization.
A multifunctional boron nitride–gold nanocluster composite was fabricated using poly-diallyldimethylammonium chloride as a stabilizer and a linker. The as-fabricated composite could be used as a fluorescent or an electrochemical label for immunosensing in the sensitive detection of interleukin-6.
Addressing the challenges of volume expansion and polysulfide dissolution in transition metal sulfide (MxSy) anodes during the cycling process of lithium-ion batteries (LIBs) is crucial for their practical application. This work utilizes a novel organic ligand containing a thiol group, 5-mercapto-1-phenyl-1H-tetrazole (PTA), to design a series of metal-organic porous polymers, which are then derivatized into N, S co-doped MxSy@carbon encapsing materials. The PTA organic ligand not only serves as a dopants source of N and S but also undergoes in-situ sulfurization with metal to form MxSy nanoparticles coated with carbon. Particularly, the derived NixSy@carbon hollow microspheres feature a unique hollow spherical carbon structure that not only mitigates the volume expansion of nickel sulfide but also shortens the ion diffusion distance while providing a significant number of active sites in LIBs. The research also revealed that variations in crystal structures caused by temperature have a profound influence on the Li+ storage capabilities of the LIBs. When evaluated as anode materials for LIBs, the NiS1.03@NSC600 demonstrates excellent reversible specific capacity and good long-life cycling stability. After 700 charge/discharge cycles, the NiS1.03@NSC600 anode maintains a reversible specific capacity of 480.4 mAh g-1 at 1 A g-1.
We have developed a fluorescence quantitative analysis method for the simultaneous detection of Hg2+, Pb2+ and Ag+ based on fluorescently labelled nucleic acid aptamer probes and graphene oxide (GO). By this method, three nucleic acid aptamer probes (PHg, PPb, PAg) were designed. The carboxyl fluorescein (FAM), tetramethyl-6-carboxyrhodamine (TAMRA) and cyanine-5 (Cy-5) were respectively selected as fluorophore of aptamer probes, and GO was chosen as quencher. In general, these probes were on free single-stranded state and adsorbed on the surface of GO via π-π interactions, which brought fluorophores of probes and GO into close proximity. Due to the fluorescence resonance energy transfer occurred between fluorophores and GO, the fluorescence was quenched and fluorescence signals were all weak. Under the optimal condition, fluorescence intensities of three fluorophores exhibited a good linear dependence on corresponding ions concentration. The detection limit for Hg2+, Pb2+ and Ag+ were 0.2, 0.5 and 2 nmol/L (3σ, n = 11). Average recoveries of this method were 97.56–104.92%, which indicated the method had a high accuracy and low detection limit. In addition, this proposed method has good selectivity, and there was no crosstalk effect among these probes.
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