| As an important semiconductor nanomaterial,transition metal sulfide nanomaterials have been continuously developed and applied in the field of optoelectronics.First of all,there have been many developments from the preparation method.Among them,the hydrothermal method is the most used and the most convenient one.It mainly depends on the three factors of reaction temperature,reaction time,and composition to control the size of the material.Compared with the traditional mechanical peeling method,this method has lower cost and higher yield.In this paper,a method for preparing small-sized metal sulfide nanomaterials has been explored using the water/solvothermal method.First,a series of characterization techniques（SEM,TEM,XRD,XPS,etc.）are used to observe the morphology of the target material.,Composition,particle size.On this basis,the quantum size effect of nanomaterials is used to explore the optical properties of transition metal sulfide nanomaterials.At the same time,it uses its wider ultraviolet-visible absorption spectrum,narrower emission band,and adjustable band gap to achieve optical advantages.It can efficiently detect analytes（metal ions,drugs）.The main contents of this paper are as follows:1.A solvothermal method for preparing Co Se2 quantum dots was developed.Cose2quantum dots were prepared by using Co（NO3）2·H2O and Se powder as raw materials and ethylenediamine as solvent.The morphology,structure and optical properties of Co Se2QDs were characterized by a series of basic characterization techniques.The results show that the size of Co Se2 QDs is between 30 nm and 40 nm,which has obvious fluorescence characteristics The fluorescence properties of Co Se2 QDs were used to detect a series of drugs.It was found that the quantum dots had response characteristics to ciprofloxacin hydrochloride.The linear range was 7.50×10-7 mol·L-1～2.50×10-6 mol·L-1,and the detection limit was 2.98×10-8 mol·L-1.2.Ni S nanospheres were synthesized by one-step hydrothermal method using nickel nitrate and L-cysteine as raw materials.By scanning electron microscope（SEM）,transmission electron microscope（TEM）,X-ray electron diffractometer（XRD）,X-ray photoelectron spectroscopy（XPS）,ultraviolet-visible spectroscopy（UV-Vis）and fluorescence（PL）A series of characterizations were performed on Ni S nanomaterials.The results of the study found that Ni S nanoparticles have a spherical structure with a particle size between 150 and 200 nm.Through their fluorescence quenching of metal ions,they have the highest responsiveness to Fe3+and belong to static quenching.The final result is that it can measure Fe3+.The linear range is 6.00×10-6 mol·L-1～1.30×10-5 mol·L-1,and the detection limit is 1.97×10-6 mol·L-1,which has relatively high selectivity and sensitivity.The linear range of Cr3+is 1.67×10-6 mol·L-1～1.67×10-5 mol·L-1 The detection limit is4.42×10-7 mol·L-1,and the linear range of Hg+is 3.33×10-6 mol·L-1～1.00×10-5 mol·L-1The detection limit is 5.77×10-7 mol·L-1 has good sensitivity and a wide linear range,and can be used for the detection of multiple ions.3.Designed a kind of molybdenum selenide quantum dots（Mo Se2 QDs）with ethylenediamine（En）as solvent,Na2Mo O4 and Se powder as raw materials,through simple ultrasonic treatment and solvothermal reaction.The structure was observed by scanning electron microscope,and the optical properties of Mo Se2QDs were checked by ultraviolet-visible spectroscopy and fluorescence spectroscopy.I heard the characterization proved that good Mo Se2 QDs were prepared with relatively uniform particle size,with a particle size in the range of 5-10 nm,with strong blue fluorescence performance and good dispersibility.In addition,Mo Se2 QDs are used as probes to produce fluorescence quenching after interacting with metal ions,and the response is rapid.It is considered to be an efficient method for measuring Fe3+and Hg2+fluorescence,so it can be widely used in the sensing and detection of analytes.among. |
PDF Full Text Request