Fabrication and characterization of NiPcTs organic semiconductors based surface type capacitive–resistive humidity sensors

Abdulameer, Ameer F.; Suhail, Mahdi Hasan; Abdullah, Omed Gh.; Al-Essa, Izzat M.

doi:10.1007/s10854-017-7186-x

Cited by 23 publications

(10 citation statements)

References 43 publications

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“…It has been established that the features of the polymeric materials depend mainly on the composition and attachment of monomers; therefore, many research groups have attempted to manipulate the characteristics of polymers to create materials with specific chemical, physical, and biological properties for a particular application [3]. Currently, the research interests have been focused on the solid polymer electrode-based films, because of the possible application in organic solar cells, sensors, and electrochemical devices [4,5,6].…”

Section: Introductionmentioning

confidence: 99%

Preparation and Composition Optimization of PEO:MC Polymer Blend Films to Enhance Electrical Conductivity

Ahmed

Abdullah

2019

Polymers

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The polymer blend technique was used to improve amorphous phases of a semicrystalline polymer. A series of solid polymer blend films based on polyethylene oxide (PEO) and methylcellulose (MC) were prepared using the solution cast technique. X-ray diffraction (XRD), Polarized optical microscope (POM), Fourier transform infrared (FTIR) and electrical impedance spectroscopy (EIS) were used to characterize the prepared blend films. The XRD and POM studies indicated that all polymer blend films are semicrystalline in nature, and the lowest degree of crystallinity was obtained for PEO:MC polymer blend film with a weight ratio of 60:40. The FTIR spectroscopy was used to identify the chemical structure of samples and examine the interactions between chains of the two polymers. The interaction between PEO and MC is evidenced from the shift of infrared absorption bands. The DC conductivity of the films at different temperatures revealed that the highest conductivity 6.55 × 10−9 S/cm at ambient temperature was achieved for the blend sample with the lowest degree of crystallinity and reach to 26.67 × 10−6 S/cm at 373 K. The conductivity relaxation process and the charge transport through the hopping mechanism have been explained by electric modulus analysis. The imaginary part of electrical modulus M″ shows an asymmetrical peak, suggesting a temperature-dependent non-Debye relaxation for the PEO:MC polymer blend system.

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Section: Introductionmentioning

confidence: 99%

Preparation and Composition Optimization of PEO:MC Polymer Blend Films to Enhance Electrical Conductivity

Ahmed

Abdullah

2019

Polymers

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“…Studies of sensory phenomena in metal-oxide composites have shown that there are certain optimum compositions for which sensitivity reach maximum values [21][22][23]. On the other hand, the literature survey reveals that metal oxide gas-sensors composition is an essential factor that affected the surface morphology of the film [24]. Therefore, it is very important to investigate the morphological features of sensing materials which depend primarily on the nature of the components and the processing conditions.…”

Section: Introductionmentioning

confidence: 99%

Characterization and NO2 gas sensing performance of CdO:In2O3 polycrystalline thin films prepared by spray pyrolysis technique

2018

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Polycrystalline CdO:In 2 O 3 thin films for gas sensor applications were prepared on glass and silicon substrates by using one-step spray pyrolysis technique from the aqueous solution of CdCl 2 and InCl 3 at a substrate temperature of 300 °C. The structure, surface morphology, and the optoelectronic properties of prepared films were characterized respectively by means of X-ray diffraction (XRD), atomic force microscope and UV-visible spectroscopy. Based on the XRD results, the polycrystalline nature of CdO films has been confirmed, and In 2 O 3 films were found to exhibit a preferred orientation along (222) diffracted plane. The grain size varies between 9.0 and 28.4 nm. The results of Hall effect measurement of CdO:In 2 O 3 thin films confirms that all films were an n-type semiconductor. The electrical properties of prepared thin films and their sensitivity to nitrogen dioxide (NO 2) gas are also studied. The influence of the operating temperature and In 2 O 3 concentration on the NO 2 response were investigated. It is found that all films are sensitive to NO 2 gas, and the ideal operating temperature for the film contented 20 vol% of In 2 O 3 was found to be 200 °C at a gas concentration of 25 ppm. The sensing mechanism of the CdO:In 2 O 3 thin film is discussed and attributed to electron transfer between the sensing element and NO 2 molecules.

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“…The exponent γ may have values of 1/2, 2, 3/2, and 3, corresponding to the allowed direct, allowed indirect, forbidden direct, and forbidden indirect electron transitions, respectively . Figure shows the plot of (α hv ) versus photon energy ( hv ) for MC:Co(NO 3 ) 2 solid polymer electrolyte, before and after, surface treatment using H 2 S gas. The direct optical band gap values were determined from the intersection of the extrapolation of the linear part of the plots to the hv ‐axis, and are listed in Table .…”

Section: Resultsmentioning

confidence: 99%

“…In recent years, a great deal of efforts has been devoted to develop and improve the efficiency of polymer electrolyte nanocomposite because of their potential applications in electrochemical devices, fuel cells, batteries, supercapacitors, and various types of sensors . The enhancement of the ionic conductivity at ambient temperature is an important subject in the research and development of polymer electrolytes .…”

Section: Introductionmentioning

confidence: 99%

Surfaces modification of methylcellulose: Cobalt nitrate polymer electrolyte by sulfurated hydrogen gas treatment

Abdullah

Aziz

et al. 2018

J of Applied Polymer Sci

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This article discusses the surface modification of methylcellulose:nitrate cobalt [MC:Co(NO3)2] through the sulfurated hydrogen (H2S) gas treatment. Solution cast technique has been used to fabricate MC:Co(NO3)2‐based solid polymer electrolytes. The results achieved for structural, morphological and optical properties indicate that H2S gas treatment is crucial for modification of polymer electrolytes to polymer composites. The morphological appearance revealed that the H2S gas treatment produced cobalt sulfide (CoS) nanoparticles on the surface of the films. The results of X‐ray diffraction indicate the disruption of the crystalline phase of the MC polymer upon addition of various amounts of Co(NO3)2 salt. The optical absorption spectra of the electrolyte samples shifted to higher wavelengths with increasing the cobalt nitrate salt concentration. The optical band gap of MC incorporated with 40 wt % Co(NO3)2 concentration was 4.69 and reduced to 4.52 eV after H2S surface treatment. The linear relationship between the refractive index and salt concentration supports the uniform distribution of the developed nanoparticles appeared in STM images. The significant change in intensity and position of Fourier transform infrared transmittance bands is an evidence for the formation of charge transfer complex between the added salt and the MC host polymer. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 46676.

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Fabrication and characterization of NiPcTs organic semiconductors based surface type capacitive–resistive humidity sensors

Cited by 23 publications

References 43 publications

Preparation and Composition Optimization of PEO:MC Polymer Blend Films to Enhance Electrical Conductivity

Preparation and Composition Optimization of PEO:MC Polymer Blend Films to Enhance Electrical Conductivity

Characterization and NO2 gas sensing performance of CdO:In2O3 polycrystalline thin films prepared by spray pyrolysis technique

Surfaces modification of methylcellulose: Cobalt nitrate polymer electrolyte by sulfurated hydrogen gas treatment

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