SEMICONDUCTIVITY AND GAS-SENSING PROPERTIES OF CROWN-ETHER-SUBSTITUTED LUTETIUM BISPHTHALOCYANINES

Citation
P. Bassoul et al., SEMICONDUCTIVITY AND GAS-SENSING PROPERTIES OF CROWN-ETHER-SUBSTITUTED LUTETIUM BISPHTHALOCYANINES, Sensors and actuators. B, Chemical, 26(1-3), 1995, pp. 150-152
Citations number
6
Categorie Soggetti
Engineering, Eletrical & Electronic","Instument & Instrumentation
ISSN journal
09254005
Volume
26
Issue
1-3
Year of publication
1995
Pages
150 - 152
Database
ISI
SICI code
0925-4005(1995)26:1-3<150:SAGPOC>2.0.ZU;2-A
Abstract
The conductivity of thin films of crown ether (15-crown-5, 18-crown-6) substituted lutetium bisphthalocyanines has been studied in the prese nce of various gases. Under vacuum the films show intrinsic semiconduc ting properties (sigma approximate to 10(-6) Omega(-1) cm(-1)). When e xposed to an oxidant (O-2, I-2, Br-2), the molecular semiconductors ar e progressively transformed into doped insulators (sigma approximate t o 10(-9) Omega(-1) cm(-1)). Exposure to wet nitrogen yields fully reve rsible conductivity changes: a two orders of magnitude difference in c onductivity is measured on oxidized films when the relative humidity v aries from 10% to 90%.