Abstract: Provided is an oxide semiconductor gas sensor with improved performance that senses selectively methylbenzene gases with high sensitivity. The gas sensor includes a gas sensing layer composed of palladium (Pd)-loaded cobalt oxide (Co3O4) nanostructures. The response of the gas sensor according to the present invention to xylene gas at a concentration as low as 5 ppm is at least 150 times higher than that to ethanol gas. The response of the gas sensor to toluene gas at a concentration as low as 5 ppm is at least 100 times higher than that to ethanol gas. In addition, the oxide semiconductor gas sensor has the ability to selectively detect methylbenzene gases, including xylene and toluene (with at least 30-fold higher response to xylene and at least 15 times higher response to toluene than that to ethanol gas).

Abstract: Disclosed is a gas sensing material for methylbenzene detection. Specifically, the gas sensing material includes a nanocomposite of Cr2O3 and ZnCr2O4. The content of Cr in the nanocomposite is from 67.0 at. % to 90.0 at. %, based on the sum of the contents of Cr and Zn atoms. The gas sensing material is highly selective to methylbenzenes over other gases and is highly sensitive to methylbenzenes. Also disclosed are methods for preparing the gas sensing material. The methods facilitate control over the composition of the gas sensing material and enable rapid synthesis of the gas sensing material at low temperature. Also disclosed is a gas sensor including the gas sensing material.

Abstract: Provided is an oxide semiconductor gas sensor with improved performance that senses selectively methylbenzene gases with high sensitivity. The gas sensor includes a gas sensing layer composed of palladium (Pd)-loaded cobalt oxide (Co3O4) nanostructures. The response of the gas sensor according to the present invention to xylene gas at a concentration as low as 5 ppm is at least 150 times higher than that to ethanol gas. The response of the gas sensor to toluene gas at a concentration as low as 5 ppm is at least 100 times higher than that to ethanol gas. In addition, the oxide semiconductor gas sensor has the ability to selectively detect methylbenzene gases, including xylene and toluene (with at least 30-fold higher response to xylene and at least 15 times higher response to toluene than that to ethanol gas).

Abstract: Disclosed is a gas sensing material for methylbenzene detection. Specifically, the gas sensing material includes a nanocomposite of Cr2O3 and ZnCr2O4. The content of Cr in the nanocomposite is from 67.0 at. % to 90.0 at. %, based on the sum of the contents of Cr and Zn atoms. The gas sensing material is highly selective to methylbenzenes over other gases and is highly sensitive to methylbenzenes. Also disclosed are methods for preparing the gas sensing material. The methods facilitate control over the composition of the gas sensing material and enable rapid synthesis of the gas sensing material at low temperature. Also disclosed is a gas sensor including the gas sensing material.

Abstract: Provided is a gas sensor comprising a gas-sensitive layer consisting of nickel oxide (NiO) doped with chrome (Cr) so as to selectively detect methylbenzene gas. The gas sensor, according to the present invention, has a gas-sensitive layer consisting of Cr-doped NiO. The gas sensor exhibits superior selectivity for methylbenzene gas when compared to other gases. The gas sensor can be easily and mass produced according to the production method of the present invention and is not affected by the microstructures of the material forming the gas-sensitive layer. The present invention relates to a gas sensor exhibits a negligible sensitivity of benzene, formaldehyde, and alcohol and exhibits significantly high selectivity and sensitivity of methylbenzene gas such as xylene and toluene when the NiO sensor material with a hierarchical structure favorable to gas dispersion and response is doped with Cr.

Abstract: A solid ion conductor including a garnet oxide represented by Formula 1: L5+x+2y(Dy,E3-y)(Mez,M2-z)Od??Formula 1 wherein L is at least one of a monovalent cation or a divalent cation, D is a monovalent cation, E is a trivalent cation, Me and M are each independently a trivalent, tetravalent, pentavalent, or a hexavalent cation, 0<x+2y?3, 0?y?0.5, 0?z<2, and 0<d?12, wherein O is partially or totally substituted with at least one of a pentavalent anion, a hexavalent anion, or a heptavalent anion; and B2O3.

Abstract: Provided is a gas sensor comprising a gas-sensitive layer consisting of nickel oxide (NiO) doped with chrome (Cr) so as to selectively detect methylbenzene gas. The gas sensor, according to the present invention, has a gas-sensitive layer consisting of Cr-doped NiO. The gas sensor exhibits superior selectivity for methylbenzene gas when compared to other gases. The gas sensor can be easily and mass produced according to the production method of the present invention and is not affected by the microstructures of the material forming the gas-sensitive layer. The present invention relates to a gas sensor exhibits a negligible sensitivity of benzene, formaldehyde, and alcohol and exhibits significantly high selectivity and sensitivity of methylbenzene gas such as xylene and toluene when the NiO sensor material with a hierarchical structure favorable to gas dispersion and response is doped with Cr.

Abstract: A solid ion conductor including a garnet oxide represented by Formula 1: L5+x+2y(Dy,E3-y)(Mez,M2-z)Od??Formula 1 wherein L is at least one of a monovalent cation or a divalent cation, D is a monovalent cation, E is a trivalent cation, Me and M are each independently a trivalent, tetravalent, pentavalent, or a hexavalent cation, 0<x+2y?3, 0?y?0.5, 0?z<2, and 0<d?12, wherein O is partially or totally substituted with at least one of a pentavalent anion, a hexavalent anion, or a heptavalent anion; and B2O3.

Abstract: The present invention provides a method of coating the surface of an inorganic powder comprising; (a) providing an alcohol solution of an alcohol-soluble metal salt and an alcohol solution of an amine compound; and (b) mixing and stirring the two alcohol solutions with an inorganic powder and water, thereby coating the surface of the inorganic powder with a metal hydroxide produced from the alcohol-soluble metal salt. The inorganic powders coated with metal oxide manufactured according to the present invention exist independently without substantial agglomeration, and the metal oxide coating is deposited substantially only on the surface of the inorganic powder with uniform thickness without substantial clustering among the inorganic powders. Consequently, when a Ni electrode layer is prepared using the titanium oxide coated Ni powders manufactured according to the present invention, not only quality but also yield of MLCC can be improved.

Abstract: A solid electrolyte including a composition represented by Formula 1 below is provided: aLi2O-bB2O3-cM-dX (1) wherein M is at least one selected from the group consisting of TiO2, V2O5, WO3, and Ta2O5; X is at least one selected from LiCl and Li2SO4; 0.4<a<0.55; 0.4<b<0.55; 0.02<c<0.05; a+b+c=1, and 0?d<0.2. A method for preparing the solid electrolyte and a battery using the solid electrolyte are also provided. The solid electrolyte exhibits high ionic conductivity. Lithium and thin film batteries using the solid electrolyte are improved in charge/discharge rate, power output, and cycle life.

Abstract: The present invention provides a method of coating the surface of an inorganic powder comprising; (a) providing an alcohol solution of an alcohol-soluble metal salt and an alcohol solution of an amine compound; and (b) mixing and stirring the two alcohol solutions with an inorganic powder and water, thereby coating the surface of the inorganic powder with a metal hydroxide produced from the alcohol-soluble metal salt. The inorganic powders coated with metal oxide manufactured according to the present invention exist independently without substantial agglomeration, and the metal oxide coating is deposited substantially only on the surface of the inorganic powder with uniform thickness without substantial clustering among the inorganic powders. Consequently, when a Ni electrode layer is prepared using the titanium oxide coated Ni powders manufactured according to the present invention, not only quality but also yield of MLCC can be improved.

Abstract: The present invention provides a method of coating the surface of an inorganic powder comprising; (a) providing an alcohol solution of an alcohol-soluble metal salt and an alcohol solution of an amine compound; and (b) mixing and stirring the two alcohol solutions with an inorganic powder and water, thereby coating the surface of the inorganic powder with a metal hydroxide produced from the alcohol-soluble metal salt. The inorganic powders coated with metal oxide manufactured according to the present invention exist independently without substantial agglomeration, and the metal oxide coating is deposited substantially only on the surface of the inorganic powder with uniform thickness without substantial clustering among the inorganic powders. Consequently, when a Ni electrode layer is prepared using the titanium oxide coated Ni powders manufactured according to the present invention, not only quality but also yield of MLCC can be improved.

Abstract: A solid electrolyte including a composition represented by Formula 1 below is provided: aLi2O-bB2O3-cM-dX (1) wherein M is at least one selected from the group consisting of TiO2, V2O5, WO3, and Ta2O5; X is at least one selected from LiCl and Li2SO4; 0.4<a<0.55; 0.4<b<0.55; 0.02<c<0.05; a+b+c=1, and 0≦d<0.2. A method for preparing the solid electrolyte and a battery using the solid electrolyte are also provided. The solid electrolyte exhibits high ionic conductivity. Lithium and thin film batteries using the solid electrolyte are improved in charge/discharge rate, power output, and cycle life.

Abstract: An air-to-fuel (A/F) ratio sensor includes an insulation layer, two solid electrolyte layers made of a porous composite ceramic formed at both sides of the insulation layer, each solid electrolyte layer having an internal electrode layer on its boundary surface with the insulation layer and an external electrode layer on its other surface, and a diffusion barrier layer made of a porous composite ceramic, covering one of the external electrode layers. The A/F ratio sensor provides a linear A/F ratio signal by controlling only a pumping current for a reference partial pressure of oxygen. Thus, the A/F ratio sensor operates by a simpler driving principle, thereby simplifying the driving circuit thereof.

Abstract: A planar air-to-fuel (A/F) ratio sensor and a driving circuit therefor are provided.