Title :
Study on electrical properties for detection of organic gases by using stearic acid LB films
Author :
Kim, Do-Kyun ; Choi, Yong-Sung ; Chang, Jeong-Soo ; Kwon, Young-Soo
Author_Institution :
Dept. of Electr. Eng., Dong-A Univ., Pusan, South Korea
Abstract :
The electrical characteristics of stearic acid LB films for the horizontal direction were investigated to develop a gas sensor using LB films. The optimum conditions for film deposition were obtained through a π-A isotherms; a surface pressure of 25[dyne/cm] was obtained with ultra-thin film deposition. The deposition status of stearic acid LB films was verified by the measurement of capacitance which increased with the number of layers. The thickness of electrode was estimated at about 1000[Å] by the I-V (current-voltage) characteristics for the horizontal direction. The I-V (current-time) and I-V characteristics was measured to investigate the response properties of organic gases. Furthermore, we could distinguish the difference of I-V (current density-voltage) characteristics for the gases. Also we verified the electrical conduction shift as the number of layers increased. We show that it results from the difference of electronic affinity and conduction mechanism
Keywords :
Langmuir-Blodgett films; capacitance; electrical conductivity; gas sensors; organic compounds; vacuum deposition; π-A isotherms; 1000 angstrom; I-V characteristics; current density-voltage characteristics; deposition status; electrical conduction shift; electrical properties; electronic affinity; gas sensor; organic gas detection; response properties; stearic acid LB films; surface pressure; Capacitance measurement; Chemicals; Electric variables; Electrodes; Gas detectors; Gases; Glass; Sensor phenomena and characterization; Solvents; Substrates;
Conference_Titel :
Properties and Applications of Dielectric Materials, 1997., Proceedings of the 5th International Conference on
Conference_Location :
Seoul
Print_ISBN :
0-7803-2651-2
DOI :
10.1109/ICPADM.1997.616527
