Infrared and ultraviolet–visible spectroscopic analyses of plasma polymerized 2,6 diethylaniline thin films

Matin, Rummana; Bhuiyan, A.H.

doi:10.1016/j.tsf.2013.02.001

Cited by 18 publications

(10 citation statements)

References 22 publications

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“…The reduction in the peak intensities and disappearance of some peaks in the polymer can be interpreted as the precursor molecules being partially dissociated as a result of being subjected to the RF plasma field [ 33 ]. However, the absorption band of C=O asymmetric stretching observed in the 1800−1600 cm −1 region was possibly due to the post oxidation of the trapped free radicals, confined during film formation [ 34 ]. The emergence of a strong methyl peak at 1452 cm −1 , and relatively weaker methylene band at 1377 cm −1 , confirms that geranium oil-derived films comprise a large quantity of short unsystematically-branched chains, rather than long linear backbone structures, a structure typically associated with plasma polymer [ 26 ].…”

Section: Resultsmentioning

confidence: 99%

Retention of Antibacterial Activity in Geranium Plasma Polymer Thin Films

2017

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Bacterial colonisation of biomedical devices demands novel antibacterial coatings. Plasma-enabled treatment is an established technique for selective modification of physicochemical characteristics of the surface and deposition of polymer thin films. We investigated the retention of inherent antibacterial activity in geranium based plasma polymer thin films. Attachment and biofilm formation by Staphylococcus aureus, Pseudomonas aeruginosa, and Escherichia coli was significantly reduced on the surfaces of samples fabricated at 10 W radio frequency (RF) power, compared to that of control or films fabricated at higher input power. This was attributed to lower contact angle and retention of original chemical functionality in the polymer films fabricated under low input power conditions. The topography of all surfaces was uniform and smooth, with surface roughness of 0.18 and 0.69 nm for films fabricated at 10 W and 100 W, respectively. Hardness and elastic modules of films increased with input power. Independent of input power, films were optically transparent within the visible wavelength range, with the main absorption at ~290 nm and optical band gap of ~3.6 eV. These results suggest that geranium extract-derived polymers may potentially be used as antibacterial coatings for contact lenses.

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Section: Resultsmentioning

confidence: 99%

Retention of Antibacterial Activity in Geranium Plasma Polymer Thin Films

2017

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“…It is observed that the values of E u , the band width of the localized states, decreases as the thickness increases, except the film having thickness of 180 nm. This behaviour of the Urbach energy with thickness of the films was observed by Matin and Bhuiyan [42] and this nature may be obtained because of the reduction of the degree of disorder as well as the density of defect states [42,61]. The steepness parameter, σ which represents the broadening of the optical absorption end because of the electron phonon or exciton-phonon interactions [62], could be computed with the following relation,…”

Section: Urbach Energy and Steepness Parameters Of Ppfdh Filmsmentioning

confidence: 54%

“…The reported direct and indirect band gaps of the PPDEA films were about 3.60 and 2.23 to 2.38 eV respectively for different thicknesses. The Urbach energy decreased from0.65 to 0.47eV while the steepness parameter increased from 0.030 to 0.055 with increasing thickness [42]. Blaszczyk-Lezak et al [43] studied the preparation and optical analysis of PP perylene films at varying thicknesses and observed that films are highly absorbent and fluorescent having RMS roughness within 0.3-0.4 nm.…”

Section: Introductionmentioning

confidence: 99%

Structural, morphological, compositional and optical studies of plasma polymerized 2-furaldehyde amorphous thin films

Kabir

Rahman

Uddin

et al. 2017

Applied Surface Science

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Thickness, t ± 5 (nm) Highlights  Plasma polymerized 2-furaldehyde thin films of different thicknesses were deposited onto glass substrate in optimum conditions by glow discharge reactor.  XRD results confirmed the amorphous nature of the films.  The as-deposited PPFDH thin films contain asymmetric C-H and C≡C stretching bonds due to plasma polymerization.  The direct and indirect optical band gaps of the PPFDH thin films of different thicknesses were found to be 3.40-3.45 and 2.10-2.45 eV, respectively.  The dispersion energy increases from 6.35 to 18.85 eV while oscillator energy decreases from 3.17 to 2.83 eV with increasing thickness of the thin films.

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“…The PPDEAEMA thin films were deposited on top of glass substrate at room temperature using a cylindrical‐type capacitively coupled glow discharge system consisting of two stainless steel parallel plate electrodes of diameter and thickness 0.09 and 0.001 m, respectively positioned at a distance of 0.04 m. By means of a step‐up transformer connected to the electrodes, glow discharge plasma was generated around the substrates, with a power of about 40 W at standard line frequency of 50 Hz . During deposition, the pressure of the chamber was maintained approximately at about 13.3 Pa at room temperature.…”

Section: Methodsmentioning

confidence: 99%

Electrical conduction mechanism in plasma polymerized 2‐(diethylamino)ethyl methacrylate thin films

Afroze

Bhuiyan

2015

Polymer Engineering & Sci

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Thin films of different thicknesses were prepared through glow discharge of 2-(diethylamino)ethyl methacrylate (DEAEMA) using a capacitively coupled reactor. Current density-voltage (J-V) characteristics for plasma polymerized (PP) DEAEMA thin films of thicknesses 100, 200, 250, and 300 nm in aluminum/PPDEAEMA/aluminum sandwich configuration were studied over the temperature range from 298 to 423 K. J-V curves reveal that in the lowvoltage region, the conduction current obeys Ohm's law while in the high-voltage region the behavior attributed to be space charge-limited conduction in PPDEAEMA thin films. The carrier mobility was calculated to be about 6.80 3 10 219 to 2.38 3 10 218 m 22 V 21 s 21 for various thicknesses. The free carrier density was found to be about 1.78 3 10 23 to 2.04 3 10 23 m 23 , and the trap density was found to be about 6.93 3 10 23 to 15.9 3 10 23 m 23 for different thicknesses. The activation energies were estimated to be about 0.005-0.016 eV for 2 and 30 V of PPDEAEMA thin films of different thicknesses. The lowactivation energies indicate that the thermally activated hopping conduction is operative in PPDEAEMA thin films.

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Infrared and ultraviolet–visible spectroscopic analyses of plasma polymerized 2,6 diethylaniline thin films

Cited by 18 publications

References 22 publications

Retention of Antibacterial Activity in Geranium Plasma Polymer Thin Films

Retention of Antibacterial Activity in Geranium Plasma Polymer Thin Films

Structural, morphological, compositional and optical studies of plasma polymerized 2-furaldehyde amorphous thin films

Electrical conduction mechanism in plasma polymerized 2‐(diethylamino)ethyl methacrylate thin films

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