title: Evaluation of gas permeation barrier properties using electrical measurements of calcium degradation.
abstract: In this work, we developed a thin calcium degradation method introducing sensitive electrical resistance monitoring. We have demonstrated structural models of the inorganic/organic thin films to evaluate barrier properties against water and oxygen permeation. The time-dependent transmission curve of a multibarrier coated on both sides of the polyethersulfone substrate had a linear slope which was measured as 5.17 x 10(-3) gm(2) day at 20 degrees C and 60% relative humidity. This system can measure an accurate permeation rate with a high sensitivity in the measurable range of 10(1)-10(-6) gm(2) day. In addition, the test structure devised is applicable to various fabrication techniques for passivation layers with durability and ultralow permeability for flexible organic light emitting diodes.
authors.affiliation: Display and Nanosystem Laboratory, College of Engineering, Korea University, 5-1 Anam-Dong, Seongbuk-Gu, Seoul 136-713, Korea.
authors.forename: Jin Hwan
authors.initials: JH
authors.lastname: Choi
authors.forename: Young Min
authors.initials: YM
authors.lastname: Kim
authors.forename: Young Wook
authors.initials: YW
authors.lastname: Park
authors.forename: Jin Woo
authors.initials: JW
authors.lastname: Huh
authors.forename: Byeong Kwon
authors.initials: BK
authors.lastname: Ju
authors.forename: In Sun
authors.initials: IS
authors.lastname: Kim
authors.forename: Hee Nam
authors.initials: HN
authors.lastname: Hwang
mesh_terms: D002118:Calcium / Q000032:analysis* / Q000737:chemistry; D017097:Electric Impedance; D004563:Electrochemistry / Q000295:instrumentation* / Q000379:methods; D004867:Equipment Design; D019544:Equipment Failure Analysis; D005740:Gases / Q000737:chemistry*; D008422:Materials Testing / Q000295:instrumentation* / Q000379:methods; D008567:Membranes, Artificial; D010100:Oxygen / Q000737:chemistry*; D016062:Porosity; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D014867:Water / Q000737:chemistry*
chemical_list: D005740:Gases; D008567:Membranes, Artificial; D014867:Water; D010100:Oxygen; D002118:Calcium