TECHNOLOGY FOCUS - POLYMERS - Preferred Properties: The ion-conducting polymeric film has an ion channel into which the clay is dispersed. The clay-ion exchange polymeric composites are coated onto a surface of the ion-conducting polymeric film. The ion- conducting polymer comprises sulfonic acid group, carboxylic acid group and/or phosphoric acid group, in its repeating unit. The ion-conducting polymeric film is Nafion (TM) or sulfonated polystyrene-block-poly(ethylene-ran-butylene)-block-polystyrene (SSEBS). The ion-exchange membrane has ion-conductivity greater than 1x10-5 S/cm at room temperature.    TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Clay: The clay is natural clay chosen from layered silicates containing pyrophylite-talc, smectite (montmorillonite), vermiculite, illite, mica and/or brittle mica.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Clay: The clay is organic clay which is organized by at least one agent chosen from CH3NH3+Cl-, CH3(CH2)2NH2, CH3(CH2)3NH2, CH3(CH2)7NH2, CH3(CH2)9NH2, CH3(CH2)11NH2, CH3(CH2)15NH2, CH3(CH2)17NH2, HOOC(CH2)5NH2, HOOC(CH2)11NH2, (CH3)4N+Cl-, CH3(CH2)17NH(CH3), CH3(CH2)17N+(CH3)Br-, CH3(CH2)11N+(CH3)Br-, (CH3(CH2)17)2N+(CH3)Br-, CH3(CH2)17N+(C6H5)CH2(CH3)2Br-, CH3(CH2)17N+(HOCH2CH2)CH3Cl-, CH3(CH2)14CH2(C5H5N+)Br-, H2N(CH2)6NH2 and H2N(CH2)12NH2.Preferred Composition: The composite solution further comprises an electrode catalyst for a fuel cell in use of manufacturing catalyst ink. EXAMPLE - Sodium montmorillonite (Na0.66(OH)4Si8(Al3.34Mg0.66)20) of high purity was dispersed in de-ionized water to form 1 wt.% of solution. Nafion 117 (TM) was soaked in water to swell and the result was re-soaked into the 1 wt.% sodium montmorillonite solution for 1 day. The membrane was then removed from the solution and washed with water. The membrane was then re-soaked in 1 wt.% sodium montmorillonite solution for 1 hour to form a self-assembly membrane. The resulting membrane was dried for 2 hours and soaked in water. The ion conductivity and methanol permeability were measured. The ion conductivity was 3.1x10-2 S/cm, and the methanol permeability was 1x10-7 cm2/second.