In:
Journal of Vacuum Science & Technology B: Microelectronics and Nanometer Structures Processing, Measurement, and Phenomena, American Vacuum Society, Vol. 15, No. 4 ( 1997-07-01), p. 1432-1436
Abstract:
In this article, Europium bisphthalocyanine ( EuPc2′) ten-layer Langmuir–Blodgett films transferred to an interdigital electrode has been prepared. The LB films are fabricated microsensors for halogen gases. The sensor incorporates a microheater and a diode to control the temperature of the film. The gas concentration is measured by the conductance change. The film temperature effects on sensitivity, response and recovery time. When the sensor was operated at above 120 °C, the response had a slow downward drift, indicating the bond formation between the Cl2 and the Pc rings which caused the ring to become chlorinated and lose its conductivity. The interaction between EuPc2′ and Cl2 in the LB films was monitored by UV-vis spectroscopy. LB films exposed to Cl2 gave a red-shifted Q band which is similar to the electrochemical oxidation of the macrocycle. The response time of ten-layer LB films is 45 s and the recovery time is 1 min in the vapor of 50 ppm Cl2 in room temperature.
Type of Medium:
Online Resource
ISSN:
1071-1023
,
1520-8567
Language:
English
Publisher:
American Vacuum Society
Publication Date:
1997
detail.hit.zdb_id:
3117331-7
detail.hit.zdb_id:
3117333-0
detail.hit.zdb_id:
1475429-0
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