Preparation And Thermodynamic Study Of Copper Indium Oxide Nanopowder

Copper Indium Oxide (CIO) is very important Transparent Conductive Oxide (TCO). In this study, values of standard enthalpies of formation, Values of standard entopy and Values of constant heat capacity of LiInO2,NaInO2 and CuInO2 were estimatied at 298K in the study. Values of standard Gibbs free energy of formation of LiInO2,NaInO2 and CuInO2 were calculated. The CIO powder was prepared by cation exchange reaction method and reduction coprecipitation method. The In of 3N,Cu,Li2CO3,Na2CO3 are raw mererials, the NaOH solution is precipitating reagent, the C6H12O6 solution is reducing agent.Thermodynamics behaviour of formation of CuInO2 by solid reaction process was studied. Formation of CuInO2 reaction is reversible. CuInO2 was will be decomposition and Cu2O was oxidized with elevated temperature, but formation CuInO2 at low temperature in air. The temperature should be less than 1251K in the kinetic permit conditions.Thermodynamics behaviour of formation of LiInO2 by solid reaction process was studied. Transition point temperature is 293.45K for the reaction between Na2CO3 and In2O3, and the reaction is thermopositive reaction. Reaction is beneficial to lower temperature in permit conditions, when the Reaction reaction begins. Li2CO3 was will decomposed into Li2O and CO2 endothermicly, when the temperature is greater than 974K, and entropy decreas Responsely. This process is very complicated.Thermodynamics behaviour of formation of NaInO2 by solid reaction process was studied. Transition point temperature is 1266K for the reaction between Li2CO3 and In2O3, and the reaction is thermopositive reaction. Because of△Sr0>0, Reaction is beneficial to high temperature in permit conditions. Na2CO3 was will decomposed into Na2O and CO2, when the temperature is greater than 1468K.Thermodynamics behaviour of formation of CuInO2 by cation exchange reaction method was studied. CuInO2 may was prepared to LiInO2, CuCl or NaInO2, CuCl as raw material. But comparing the stability, extensive sources of raw materials, economic of Li2CO3 and Na2CO3, transition point temperature of two reactions between LiInO2 and NaInO2, with CuCl, we know it is better opting for NaInO2 as a raw material. Reaction temperature should not exceed 673K, or CuCl to a large number of evaporation. CuInO2 was will be decomposition and Cu2O was oxidized with elevated tempera-ture. The powder of LiInO2 and NaInO2 were prepared to Li2CO3, Na2CO3and In2O3 as raw materials at 1273K. The powder of CuInO2 was prepared to LiInO2, NaInO2 and CuCl as raw materials at 773K. CuInO2 is easy decomposition, time-consuming, high energy consumption, and lower efficiency of preparation process.Prepared CIO by reduction coprecipitation method optimal parameters was:coprecipitation temperature 303-313K; concentration of coprecipita-tion precipitant-200g/L; concentration of reduction precipitant-340g/L; reduction ageing time 15-25min; pH 10-11; ultrasonic dispersion; violent stirring; slowly added precipitant; absolute ethyl alcohol Dispersed and washing; precursor of CIO was calcinated for 2-3h in Argon at 773-973K. particle size is 23.53nm, spherical particles, small aggregates, dispersion, and color are sepia solid melting Cu2O-In2O3 powder was prepared. Cu2O-In2O3 can be directly used as the target preparation CuInO2 thin films.