The effect of FeCl3 on the optical constants and optical band gap of MBZMA-co-MMA polymer thin films

Yakuphanoğlu, F.; Barim, Gamze; Erol, İbrahi̇m

doi:10.1016/j.physb.2006.09.009

Cited by 62 publications

(30 citation statements)

References 16 publications

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“…The imaginary and real parts of dielectric constant of the polymer film were determined using the relations in Refs. [21,22]. The real and imaginary parts dependence on photon energy is shown in Fig.…”

Section: Resultsmentioning

confidence: 98%

Electrical conductivity and optical properties of poly(3‐thiophene boronic acid) organic semiconductor

Yakuphanoğlu

Şenkal

2009

Polymer Engineering & Sci

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Electrical conductivity and optical properties of the poly(3-thiophene boronic acid) have been investigated. The room temperature electrical conductivity and activation energy of the poly(3-thiophene boronic acid) were 2.0 3 10 29 S/cm and 0.17 eV, respectively. In the semiconductor region of the polymer, the charge transport mechanism is taking place by the hopping process in the localized states. The direct optical band gap value of the poly(3-thiophene boronic acid) was found to be 1.92 eV via optical absorption method. The width of localized states for the polymer was determined to be 0.36 eV. The refractive index dispersion curve of the polymer obeys the single oscillator model. The refractive index dispersion parameter E o /S o for the poly(3-thiophene boronic acid) was determined to be 9.82 3 10 12 eV m 2 . The optical dielectric constants of the polymer were determined. The real part of the dielectric constant of the polymer is higher than that of imaginary part of the dielectric constant. The imaginary part shows a peak corresponding to the absorption edge. It is evaluated that the electrical and optical results of the poly(3-thiophene boronic acid) indicate that it is an organic semiconductor with electrical and optical parameters. POLYM. ENG. SCI., 49:722-726, 2009.

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Section: Resultsmentioning

confidence: 98%

Electrical conductivity and optical properties of poly(3‐thiophene boronic acid) organic semiconductor

Yakuphanoğlu

Şenkal

2009

Polymer Engineering & Sci

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“…The absorption edges, seen in Figure a, resemble those proposed by Tauc and Menth for an ideal amorphous semiconductor, and the slopes of the exponential edges have been found to follow the Urbach relationship

α \propto \exp \frac{E}{E_{normalU}}

where E U is the Urbach energy, i.e., the width of localized states within the optical gap . The possible structural defects in polymers, like a break, torsion or aberration of polymer chains, cause the Urbach‐like behavior of the absorption edge . It is known, that thermally rearranged polyheteroarylenes have unusual nanoporous structure.…”

Section: Resultsmentioning

confidence: 92%

“…The best fit to the absorption edge of the both investigated films turned out to be for x = 2, corresponding to a linear dependence

{(α \cdot E)}^{1 / 2} = f (E)

which is known as the Tauc relation . This relation is typical for amorphous semiconductors and it is often used to determine energy gaps of the polymer films . In this work, the application of the Tauc relation has been justified by the X‐ray diffraction patterns of HPI and PBO (Figure ) confirming amorphous character of the both investigated membranes.…”

Section: Resultsmentioning

confidence: 99%

“…[ 26 ] The possible structural defects in polymers, like a break, torsion or aberration of polymer chains, cause the Urbach-like behavior of the absorption edge. [ 27,28 ] It is known, that thermally rearranged polyheteroarylenes have unusual nanoporous structure. These pores signifi cantly infl uence the number of defects and localized defect states within the energy gap, hence the greater E U value of PBO then for the HPI (before TR).…”

Section: Optical Parameters At Room Temperaturementioning

confidence: 99%

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Optical Studies of Poly(hydroxy imide) to Polybenzoxazole Thermal Rearrangement

Jarząbek

Wójtowicz

Wolińska‐Grabczyk

2015

Macro Chemistry & Physics

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Studies of the optical properties of poly(hydroxy imide) (HPI) exposed to stepwise heating from room temperature up to 400 °C are reported in this work. It is demonstrated that this new method can be used to monitor thermal rearrangement (TR) of HPI to polybenzoxazole (PBO). Temperature dependences of the absorption edge parameters (Urbach energy and energy gap) are obtained and used to estimate the changes in the defects states and conjugation within the polymer chain associated with its TR to PBO. It is shown that the conversion temperatures determined based on the optical studies correspond to those received from the thermogravimetric analysis (TGA) investigations. Moreover, it is demonstrated that transition to PBO is accompanied by an 11-fold increase in nitrogen permeability associated with only a slight decrease in O 2 /N 2 selectivity from 8.8 to 7.2.

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“…7 and 8 that, the real and imaginary part of dielectric constant increases with increase of Al 2 O 3 content; this may be attributed to the increased dielectric nature of the film as well as the increased porosity. The absorption coefficient has energy dependence near the absorption band edge and its dependence on photon energy is expressed as [24] (9)…”

Section: Optical Studymentioning

confidence: 99%

Optical properties of pseudo binary oxides (TiO2)1-x-(Al2O3)x thin films prepared by spray pyrolysis technique

Chandrashekara

Angadi

Shashidhar

et al. 2016

Materials Today: Proceedings

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Pseudo binary oxide thin films,(TiO 2 ) 1-x -(Al 2 O 3 ) x, were prepared by spray pyrolysis technique on cleaned quartz and silicon substrates. The prepared precursor solutions of Al 2 O 3 and TiO 2 were mixed thoroughly in appropriate volume, calculated from the molar fraction. The XRD pattern of Al 2 O 3 -TiO 2 film shows anatase phase and mixed phase of Al 2 TiO 5 (Aluminum Titanium oxide). The SEM micrograph shows spherical grains with nano porous surface and some clusters, it is also composed of crumb like nano particles and average grain sizes are estimated. In the EDAX spectrum, the signals corresponding to oxygen (O 2 ), titanium (Ti), aluminum (Al) and substrate silicon (Si) are seen, elemental analysis shows that weight percentage are in stoichiometric ratio. Transmittance and Reflectance spectra were recorded in normal incidence by UV-Visible Spectrophotometer in wavelength range 350nm to 1200nm. Using these optical data the thickness, refractive index, extinction coefficient, real and imaginary part of dielectric constants, energy band gap, Urbach energy and Packing density are estimated. It is observed that, with the increase in molar fraction there is a variation of the energy band gap, which may be attributed to the mixed phase formation in the films as well as formation of defects. The obtained pseudo binary oxide thin films have wide band gap and porous surface structure; hence these films are further used for sensing application.

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The effect of FeCl3 on the optical constants and optical band gap of MBZMA-co-MMA polymer thin films

Cited by 62 publications

References 16 publications

Electrical conductivity and optical properties of poly(3‐thiophene boronic acid) organic semiconductor

Electrical conductivity and optical properties of poly(3‐thiophene boronic acid) organic semiconductor

Optical Studies of Poly(hydroxy imide) to Polybenzoxazole Thermal Rearrangement

Optical properties of pseudo binary oxides (TiO2)1-x-(Al2O3)x thin films prepared by spray pyrolysis technique

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