Impact of nucleation of carbonaceous clusters on structural, electrical and optical properties of Cr+-implanted PMMA

Arif, Shafaq; Rafique, Muhammad Zeeshan; Saleemi, Farhat; Naab, F.; Toader, Ovidiu; Mahmood, Arshad; Aziz, Uzma

doi:10.1007/s00339-016-0388-x

Cited by 5 publications

(7 citation statements)

References 42 publications

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“…Similar to the studies in the literature, the indirect transition energies ( E i ) were obtained lower than the direct transition energies ( E d ) . In literature, the studies on various PMMA composites have reported that the optical band gap energy is in the range of 3.0–5.5 eV for pure PMMA , and the band gap energy level of insulating materials is around 6 eV. As pure PMMA is an insulating polymer, the value of 6 eV obtained is an acceptable result.…”

Section: Resultssupporting

confidence: 80%

“…This behavior was attributed to the increase of the local levels in the band gap, hence the distant between the conduction and valance band was decreased . This is an expected result, because the conductive additives added to the insulating PMMA matrix increase the conductivity of the composites and composites become semi‐conductive state . Additionally, E d values have two distinct linear regions in Fig.…”

Section: Resultsmentioning

confidence: 69%

“…While this increment is linear for R

\leq

6 wt% , it has an exponential character for R

\geq

10 wt% . It has previously been reported that the E U values are increased by increasing the amount of conductive additive for various PMMA composite systems . E U is also a measure of amorphousness .…”

Section: Resultsmentioning

confidence: 99%

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Effects of GNP addition on optical properties and band gap energies of PMMA films

et al. 2018

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In this study, the effects of graphene nanoplatelet (GNP) doping on the optical parameters (absorption coefficient, α and extinction coefficient, k) and the optical transition energies (optical band gap and Urbach energies) of poly(methyl methacrylate)/graphene nanoplatelet (PMMA/GNP) composite films were studied. PMMA/GNP composite films with various GNP mass fractions were prepared by spin coating technique. The absorbance (A) changes of the prepared composites were measured by using UV–Vis technique. The α and k values of the composites were obtained from UV–Vis data. The observed rapid increase in A values in UV‐region were associated with the optical transitions of GNP electrons from valence to conduction band. The direct (Ed) and indirect (Ei) optical band gap energies of the composites were determined by using Tauc method. Both of the band gap energies were decreased when the GNP content in the PMMA matrix is increased. The decrease in the band gap energies was interpreted as evidence of increased conductivity of the composites. Additionally, energies of the band tails (Urbach energy) were calculated. It was seen that the Urbach energy levels were increased with GNP content. POLYM. COMPOS., 40:1862–1869, 2019. © 2018 Society of Plastics Engineers

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Section: Resultssupporting

confidence: 80%

Section: Resultsmentioning

confidence: 69%

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Effects of GNP addition on optical properties and band gap energies of PMMA films

et al. 2018

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“…That is why, ion implantation is successfully used for surface engineering of organic polymers without altering the properties of the substrate material in the bulk. By ion-beam technology one can significantly improve the optical characteristics [14,[20][21][22][23][24], electronic properties [24][25][26][27][28][29], electrical conductivity [14,[25][26][27]30], biocompatibility [31,32], surface, mechanical and thermal properties [25][26][27]30] of optically-transparent synthetic polymers, such as polymethylmethacrylate (PMMA) and polycarbonate. Even at low energy (keV range), ion implantation can change the surface, the chemical structure and thereby the properties of such plastics.…”

Section: Introductionmentioning

confidence: 99%

Near-Surface Nanostructuring of Polymethylmethacrylate by Silicon Ion Implantation

Hadjichristov

Ivanov

2022

JNanoR

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The properties of organic polymers implanted with low-energy ions are of scientific and practical interest. In this work, we consider the nanostructure produced in the near-surface region of polymethylmethacrylate (PMMA) implanted with silicon (Si+) ions at energy of 50 keV and ion fluence of 1016 ions/cm2. By controlled local chemical modification in a depth of 150 – 200 nm, in PMMA was created a nano-thin bi-layer configuration consisting of ion-modified layer and ion-implanted layer with carbonaceous nanostructure. Such complex nanoscale arrangement and organic transconductance configuration was characterized by direct current electrical measurements. The field-effect configuration in Si+-implanted PMMA was driven through the formed ion-implanted buried planar layer (as a channel with a thickness of about 100 nm) of nanoclustered amorphous carbon as an organic semiconductor. The values of performance parameters, such as the charge carrier mobility, contact resistance and gate leakage current of this particular type of organic field-effect transistor configuration were determined.

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“…For instance, tetrahedral amorphous carbon insulators have been converted into graphitic nanowires and self‐aligned structures, and ions have been used to slice and weld single walled nanotubes . Nucleation of conjugated carbon clusters has also been induced in an assortment of traditional polymers, including poly(ethylene terephthalate) (PET), polycarbonate (PC), and poly(methyl methacrylate) (PMMA), bringing about a consummate transformation and enhancement of their mechanical and electrical properties …”

Section: Introductionmentioning

confidence: 99%

Formation of nanocrystalline and amorphous carbon by high fluence swift heavy ion irradiation of a plasma polymerized polyterpenol thin film precursor

Grant

Siegele

Bazaka

et al. 2018

J of Applied Polymer Sci

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This study aimed to produce graphitic-polymer nanocomposite thin films via the swift heavy ion irradiation of polyterpenol thin films synthesized from an environmentally sustainable precursor by radio-frequency plasma enhanced chemical vapor deposition. Atomic force microscopy and scanning electron microscopy revealed fluence-dependent surface restructuring of the thin films leading to the formation of interconnected island structures, with no discernible delamination from the underlying aluminum substrate. Raman spectroscopy confirmed the development of D and G peaks associated with graphitic materials, whilst Fourier transform infrared spectroscopy indicated retention of the plasma polymer's chemical functionalities (including hydroxyl groups) within the material after irradiation. Graphitic-polymer nanocomposite films prepared by this dry and solvent-free process have numerous potential applications in biological assay, organic electronics, and membrane technology.

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Impact of nucleation of carbonaceous clusters on structural, electrical and optical properties of Cr+-implanted PMMA

Cited by 5 publications

References 42 publications

Effects of GNP addition on optical properties and band gap energies of PMMA films

Effects of GNP addition on optical properties and band gap energies of PMMA films

Near-Surface Nanostructuring of Polymethylmethacrylate by Silicon Ion Implantation

Formation of nanocrystalline and amorphous carbon by high fluence swift heavy ion irradiation of a plasma polymerized polyterpenol thin film precursor

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