Process for the synthesis of nanoparticles of transition metal chalcogenides
AssigneeCouncil of Scientific and Industrial Research
InventorsMonika Monika, Pankaj Poddar
Life of this patent
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Abstract
A process for the synthesis of transition metal chalcogenides (TMC) having formula (I). More particularly, the present work relates to a one pot single phase process for the synthesis of a TMC system having formula (I) by wet chemistry. Formula (I) is represented as Ax-By.
Claims9
A one pot single phase process for the synthesis of a transition metal chalcogenide nanoparticle system having formula (I) by using wet chemical method, the process comprising:
- mixing and stirring both a transition metal precursor and a chalcogen precursor at a temperature in a range of 25° C. to 30 C in the presence of a reducing agent and an accelerating agent under a blanket of an inert gas;
- followed by raising and maintaining the temperature in the range of 100-150° C. for a time period of 30 min and slowly increasing the temperature to 300° C. by heating at rate of 2°/min or 5° C./min or 10° C./30 min
- to obtain the transition metal chalcogenide nanoparticle system having formula (I),
- wherein the formula (I) is represented as
- Ax-By Formula (I)
- wherein,
- A is selected from the group consisting of iron, chromium, manganese, cobalt, and nickel;
- B is selected from the group consisting of selenium, sulphur, and tellurium;
- and
- Ax-By is selected from the group consisting of AB2, A3B4, A7B8 and AB;
- wherein the ratio of x and y is from 1:2 to 1:1,
- provided that when A is Fe and B is Se, then the system is not AB;
- provided that the chalcogen precursor is Se powder.
A one pot single phase process for the synthesis of transition metal chalcogenides nanoparticles system wherein said system is Fe—Se system comprising the steps of:
- a) mixing Se powder and Fe(acac)3 at a temperature in the range of 25° C. to 30° C. in the presence of an organic solvent under the blanket of inert gas with constant magnetic stirring;
- raising the temperature to 40° C. followed by stirring for 30 min and taking the first sample of only Se powder;
- c) further increasing the temperature to 50° C. followed by stirring for 30 min and taking the second sample of only Se powder;
- and
- d) increasing the temperature up to 340° C. with the rate of 10° C./30 min and taking the sample at every 10° C. rise in temperature, as the temperature increases,
- wherein FeSe2 starts forming followed by Fe3Se4, Fe7Se8 and FeSe.
Dependencies are inferred from the claim text.