جستجوی مقالات مرتبط با کلیدواژه "mos2" در نشریات گروه "شیمی"

Triazoles are an important group that have active biological properties, and their synthetic platformand reactions have been fully investigated by many synthetic and medicinal chemists during therecent years. Magnetic nanocatalysts have recently been used in the design of many reactions, soin this method, an efficient, novel, and recyclable magnetic nanocatalystγ-Fe2O3@MoS2@Znwas synthesized by the reaction of premadeγ-Fe2O3@MoS2and ZnCl2to furnish the desirednanocatalyst which was characterized by using FT-IR, XRD, SEM, EDX, TEM, mapping and VSMtechniques. The catalyst was used in the synthesis of mono- and bis-triazoles by the reaction ofthiosemicarbazide or butane-1,4-diyl-bis(hydrazinecarbimidothioate) with various arylaldehydesat room temperature and in ethanol/water (50:50) as solvent. This novel protocol gave the desiredproducts excellent yields (92−96%) and lower reaction times (15−20min). The synthesizedmagnetic nanoparticles were comfortability separated from the reaction mixture by means ofan external magnet and employed in six consecutive runs without any significant changes inits catalytic activity. The advantages of this current method are short reaction time, excellentefficiency, use of green solvent, magnetic nanocatalyst, and cost-effectiveness.

The current study describes the in-situ growth of ZnS/MoS2 on cellulose paper using the thin-film microextraction (TFME) method. On cellulose paper, ZnS/MoS2 was grown using a simple, easy, and inexpensive hydrothermal method. The digoxin was quantified after TFME using high-performance liquid chromatography-UV detection (HPLC-UV). The effect of effective parameters such as extraction time, extraction temperature, agitation speed, and sample ionic strength was investigated, and the best conditions were selected. Under ideal conditions, a calibration curve with good linearity (R2=0.987) and a low limit of detection (LOD) in the range of 0.01–100 ng mL-1 was obtained. The detection limits were 0.03 ng mL-1. For the digoxin, the relative standard deviations (RSDs) were 5.3%. The method was successfully applied to the study of urine and plasma. Relative recoveries were found to range between 96% and102 %. The proposed method provided a straightforward, efficient, and environmentally friendly way for determining digoxin in real-world samples.

ZnS-MoS2 Nanocomposite was synthesized by a cost-effective and eco-friendly hydrothermal approach to investigate the structural and optical properties of ZnS-MoS2 nanocomposite powder comparing with the pure ZnS and MoS2. The structural, morphological and optical absorption properties of prepared powder samples were characterized by Powder X-ray diffraction (XRD), Scanning electron microscopy (SEM), Diffusion reflectance spectrophotometer (DRS), FT-IR-Fourier transform infrared spectroscopy. Powder XRD results show both cubic phase and hexagonal phase structures of ZnS and MoS2. The average crystallite size lies between 20 nm to 25 nm for hydrothermally prepared nanocomposite. The dislocation density and lattice strain were also calculated. The surface morphology of the prepared nanocomposite shows spherical hexagonal flowers with agglomerations. With coupling of ZnS-MoS2, there is a slight variation in the energy band gap that slightly shifted from 3.61 to 3.57 eV and it is found to be red-shifted. The characteristic frequencies related to ZnS-MoS2 nanocomposite and other precursors related molecules are disclosed from FT-IR spectra.

In the present work,MoS2 decorated graphene nanocomposite powders were synthesized by laser scribing method.Theobtainedflexible light-scribed graphene/MoS2composites are very suitableas micro-supercapacitors and thus their performance was evaluated at different concentrations.The effect of laser scribing process to reducegraphene oxide (GO) was investigated. The GO/MoS2composite wassynthesized using a chemical mixing of GO solution withMoS2/Dimethylformamide (DMF)solution.Themixtures with various concentrations of MoS2were then coated on a LightScribe DVD disk and laser scribed to reduce GO and create aMoS2/laser-scribed graphene (LSG) composite. Four different concentrations of MoS2/LSG composites (pristine rGO, 1:100, 1:75 and 1:50 MoS2/LSG) were utilized as supercapacitor electrode and the electrode with the best performance was selected for flexible micro-supercapacitor applications. The present findingsdemonstrate that MoS2/LSGmicro-supercapacitor has high specific capacitance per area. The sample with MoS2/LSGvolume ratio of 1:50 shows the highest specific capacitance (~ 8 Fcm-3) and itscyclic stabilityis favorable over 1000 cycles. Keywords:Graphene oxide, laser scribed graphene,MoS2/LSG nanocomposite, micro-supercapacitor, RGO, Microstructure, DVD.