Hybrid polymer/cobalt chloride humidity sensors based on optical diffraction

Tsigara, A.; Mountrichas, Grigoris; Gatsouli, Κ.; Nichelatti, A.; Pispas, Stergios; Madamopoulos, Nicholas; Vainos, N.A.; Du, Haijuan; Roubani‐Kalantzopoulou, F.

doi:10.1016/j.snb.2006.02.046

Cited by 37 publications

(25 citation statements)

References 16 publications

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“…A shift to 688 nm of the main absorption band was registered, while the absorption band at 357 nm assigned to the pristine polyimide almost disappeared. The broad absorption band peaked at about 690 nm was attributed to CoCl 2 ·2H 2 O, a deep blue compound [18], according to XRD and SEM findings. Moreover, it seems reasonable to assume that these densely packed large crystals (as seen in SEM micrographs) hinder the UV light absorption of the PI film, as clearly indicated by the UV-vis absorption spectrum of the recolored film.…”

Section: Electrochemistry Of Cocl 2 /Polyimide Hybrid Materialsmentioning

confidence: 90%

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The chromic and electrochemical response of CoCl2 − filled polyimide materials for sensing applications

Damaceanu¹,

Sava²,

Constantin³

2016

Sensors and Actuators B: Chemical

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Section: Electrochemistry Of Cocl 2 /Polyimide Hybrid Materialsmentioning

confidence: 90%

“…The water binding process is reversible when the hydrated material is heated or placed under vacuum. For moisture sensing applications, CoCl 2 has been incorporated in desiccant materials and various polymers and composites [17][18][19].…”

Section: Introductionmentioning

confidence: 99%

The chromic and electrochemical response of CoCl2 − filled polyimide materials for sensing applications

Damaceanu¹,

Sava²,

Constantin³

2016

Sensors and Actuators B: Chemical

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“…By adding a second moisture adsorbing component, the total amount of moisture adsorbed by the composite material to be significantly increased is foreseen. A specific class of sensors are based on moisture adsorption change capabilities of cobalt chloride as a function of its surroundings [17,18]. CoCl 2 can easily coordinate water molecules, even in low humidity environments, along with the physical color change from blue to purple/pink.…”

Section: Introductionmentioning

confidence: 99%

Insights into the physico-chemical behavior of CoCl2/polyimide hybrid materials

2016

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Hybrid fluorinated polyimide materials have been obtained by incorporation of various quantities of cobalt(II) chloride (CoCl 2 ) into polyimide matrix. Polycondensation reaction of equimolar amounts of 4,4′-diamino-3′3′-dimethyldiphenylmethane and 2,2′-bis(3,4-dicarboxyphenyl) hexafluoropropane dianhydride has been carried out to produce in the first stage a polyamidic acid solution in which CoCl 2 × 6H 2 O has been placed. Further thermal treatment of this system led to the corresponding imide structure filled with the halide salt. An exhaustive study was directed to the influence of Co 2+ ions on the modified polyimide behavior as a function of its surroundings. To survey the functional properties of as-obtained Co 2+ -containing polyimide systems, several techniques such as FTIR, UV-vis and broadband dielectric spectroscopy, differential scanning calorimetry, and thermogravimetric and scanning electron microscopy were employed. A special concern was directed to the study of the optical properties induced by the addition of CoCl 2 into polymer solutions and films. The magnetic response of the polyimide was investigated in correlation with the salt quantity embedded in the PI film. The variation of the real and imaginary parts of the hybrid films' dielectric permittivity was registered in a broad frequency and temperature range, from 10 to 10 6 Hz and from −130 to 230°C, respectively.

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“…The ceramic sensor belongs to resistive type of sensors. It works on the principle of chemical and physical adsorption of water, which strongly depends on the surface properties and which in turn enhances the sensing properties [7].…”

Section: Introductionmentioning

confidence: 99%