Abstract:
Volatile nickel aminoalkoxide complexes, a preparation method thereof and a process for formation of a nickel thin film by using the same compounds are provided, which compounds have high volatility and sufficient thermal stability, and are reduced to nickel by self-pyrolysis without a reducing agent. so that the compounds are useful as a MOCVD(metal organic chemical vapor deposition) precursor for formation of the nickel thin film. The volatile nickel aminoalkoxide complexes represented by formula (1) are provided, wherein m is an integer of 1 to 3; and R and R' are C1-C4 linear or branched alkyl. The volatile nickel aminoalkoxide complexes represented by formula (2) are provided, wherein m is an integer of 1 to 3; n is an integer of 2 to 4; and R and R' are C1-C4 linear or branched alkyl. The method for preparing the volatile nickel aminoalkoxide complexes of formula (1) or (2) comprises a halogenized hexamine nickel compound of Ni(NH3)6X2 with an alkali metal salt of aminoalkoxide of MOCR'2(CH2)mNR2 or MOCR'2(CH2)mO(CH2)nNR2, wherein X is Cl, Br or I; and M is Li or Na. The process for formation of the nickel thin film comprises growing the nickel thin film by using the volatile nickel aminoalkoxide complexes of formula (1) or (2) as a precursor at 250 to 350 deg. C.
Abstract:
PURPOSE: To provide a method for preparing stoichiometric barium strontium titanate thin films of high quality by direct liquid injection metal organic chemical vapor deposition under the milder conditions using organic complexes of Ba, Sr and Ti that are capable of being vaporized together as raw materials for mixing since they have similar thermal stability, decomposition characteristics and solubility. CONSTITUTION: In a method for preparing barium strontium titanate(BaxSr1-xTiO3) thin films by direct liquid injection metal organic chemical vapor deposition, the method is characterized in that a mixture of Ba(th)2(tmeea), Sr(thd)2(tmeea) and Ti(thd)2(O¬i Pr)2 $ûthd=2,2,6,6-tetramethylheptanedionate, tmeea=tris£2-(2-methoxyethoxy)ethyl|amine, O¬i Pr=isoproxy$ý is used as raw materials of barium, strontium and titanium, wherein the method comprises the steps of: dissolving the raw materials of barium, strontium and titanium into an organic solvent; transferring the solution to an instantaneous vaporizer heated to a temperature of 200 to 250 deg.C so that the solution is vaporized; and injecting the vaporized solution into a deposition container having pressure of 0.5 to 2.0 torr so that the vaporized solution is deposited on a matrix heated to a temperature of 300 to 500 deg.C, wherein the method further comprises a step of heat treating the deposited matrix in a temperature range of 600 to 800 deg.C, and wherein the raw materials of barium, strontium and titanium are mixed in a ratio of 1 ¢¦ 2:1:5 ¢¦ 10.
Abstract:
A nanoparticle of a metal oxide is prepared by pyrolyzing a compound of formula (I) in a solvent:RMOR' (I) wherein M is beryllium, zinc, magnesium or cadmium; and R and R' are independently a C1-5 alkyl group.
Abstract:
PURPOSE: Provided is a method for producing divalent metal oxide powder having a nano size by solution pyrolysis by which it is possible to readily produce the metal oxide powder having a nano size and control the size and shape of the particles using a ligand. CONSTITUTION: The method for producing divalent metal oxide powder having a nano size is conducted by pyrolysis of alkylate alkyl metal compound represented by the formula of RMOR', in which M is beryllium, zinc, magnesium or cadmium and R and R' are a hydrogen atom or an alkyl group containing 1 to 5 carbon atoms, in an organic solvent. The solvent is an organic compound having a boiling point between 100 to 400 deg.C, such as hexadecane, tetra(ethyleneglycol)dimethylether, dimethoxyethane and octylether.
Abstract:
PURPOSE: Provided is a preparation method of a ruthenium complex with enhanced yield using a small amount of zinc catalyst, thereby mass-producing the ruthenium complex. CONSTITUTION: The preparation process characteristically comprises the steps of: reaction of ruthenium trichloride with 3-25 equivalents of 1,3-cyclohexadiene and 5-20 equivalents of zinc powder base on the chloride at room temperature for 10-15 hours; and extracting the reaction product with an organic solvent, then removing the organic acid therefrom.