Utility of PCDTBT polymer for the superior sensing parameters of electrical response based relative humidity sensor
Document Type
Article
Publication Date
1-1-2016
Abstract
In the present study, organic polymer PCDTBT has been deposited on pair of planar aluminium (Al) electrodes to construct an integrated capacitive and impedance type humidity sensor (Al/PCDTBT/Al). The solution processable organic polymer has been deposited through a facile spin coating technique. The structural characterization and surface morphology study of active layer has been performed by XRD and AFM. The humidity sensing characteristics of the sensor have been investigated by exposing the organic active layer to various wide range relative humidity (%RH) levels (15-98%RH) at room temperature. The proposed sensor exhibits significantly higher sensitivity ~ 39.73 pF/%RH and 821.81 kΩ/%RH when operated in capacitive and impedance mode, respectively. In addition, the capacitive sensor has desirable reproducibility, narrow hysteresis (~ 5%), fast response (8 s) and reset (14 s) time. Significantly improved sensing parameters suggest that the proposed sensor may be implemented meritoriously for continuous humidity assessment in environment.
Keywords
Conjugated polymer, Porous surface morphology, Humidity adsorption-desorption, Surface type humidity sensor, Hysteresis
Divisions
PHYSICS
Funders
Ministry of Education: High Impact Research (HIR) grant UM.S/625/3/HIR/MOE/26 with account number UM.0000080/HIR.C3,University Malaya Research Grant (UMRG) under grant number RP007A-13AFR
Publication Title
Reactive and Functional Polymers
Volume
105
Publisher
Elsevier