Photoluminescence of plasma polymerized methyl methacrylate films

Li, Guifang; Tobin, Jeffrey A.; Denton, Denice D.

doi:10.1063/1.108645

Cited by 12 publications

(11 citation statements)

References 5 publications

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“…Based on these detailed FTIR analyses, the retention of the functional groups is clearly evident in the high-flow sample. Compared to plasma films deposited from MMA [6,8,11,12,37±39] based on FTIR results, the high-flow iCVD sample in this work exemplifies much more structural resemblance to conventional PMMA than the plasma samples. FTIR studies of plasma films have shown broadened peaks, [8,11,38] diminished C=O peaks, [8,39] and weakened C±O and C±H peaks.…”

Section: Resultsmentioning

confidence: 92%

“…[6,14,15] There are many advantages of using a dry process such as CVD to produce polymer thin films. CVD avoids environmental concerns arising from solvent usage and allows films of nanoscale thicknesses with macroscale uniformity to be produced on substrates with complex geometries.…”

Section: Introductionmentioning

confidence: 99%

“…Poly(methyl methacrylate) (PMMA) thin films are of great interest because of their wide variety of uses in coatings, [1,2] membranes, [1±4] relative-humidity sensing, [5] solidstate dye layers, [6] gas and organic-vapor sensing, [4,7,8] dielectric sacrificial layers, [1,2,9] electron-beam lithography, [10±13] and photonic applications. [6,14,15] There are many advantages of using a dry process such as CVD to produce polymer thin films.…”

Section: Introductionmentioning

confidence: 99%

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Initiated CVD of Poly(methyl methacrylate) Thin Films

Chan

Gleason

2005

Chem. Vap. Deposition

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Initiated CVD (iCVD), a dry method, is able to produce poly(methyl methacrylate) (PMMA) thin films by utilizing a reactive gaseous mixture of the monomer methyl methacrylate and the initiator triethylamine. The deposition rate is twenty times faster with the use of the initiator. Fourier-transform infrared (FTIR) spectroscopy and X-ray photoelectron spectroscopy (XPS) show high structural resemblance between iCVD PMMA and conventional PMMA, and the degree of functionality retention increases with decreasing residence time in the vacuum chamber. XPS detection of nitrogen incorporation is consistent with the incorporation of the initiator into the polymer chains. NMR spectroscopy on completely dissolved films shows that the tacticity of iCVD PMMA resembles that of conventional, radically polymerized PMMA. Altogether these observations support the hypothesis that, for iCVD PMMA, the polymerization is by a free-radical mechanism.

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Section: Resultsmentioning

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Initiated CVD of Poly(methyl methacrylate) Thin Films

Chan

Gleason

2005

Chem. Vap. Deposition

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“…In the energy range of E beam /A ≤ 3.0 GeV/A, our model, as many other nuclear transport models, is able to describe many aspects of heavy-ion collisions. These include the emission of light particles, the creation of pions, kaons and etas as well as the transverse collective flow of various hadrons[42,43]. Since the particle production mechanism used in the model is exclusively based on the excitation and decay of several low-mass baryon and meson resonances, the model is expected to be inadequate once the energy is above about E beam /A = 15 GeV.…”

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confidence: 99%

Formation of superdense hadronic matter in high energy heavy-ion collisions

1995

Phys. Rev. C

510

444

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We present the detail of a newly developed relativistic transport model (ART 1.0) for high energy heavy-ion collisions. Using this model, we first study the general collision dynamics between heavy ions at the AGS energies. We then show that in central collisions there exists a large volume of sufficiently longlived superdense hadronic matter whose local baryon and energy densities exceed the critical densities for the hadronic matter to quark-gluon plasma transition. The size and lifetime of this matter are found to depend strongly on the equation of state. We also investigate the degree and time scale of thermalization as well as the radial flow during the expansion of the superdense hadronic matter. The flow velocity profile and the temperature of the hadronic matter at freeze-out are extracted. The transverse momentum and rapidity distributions of protons, pions and kaons calculated with and without the mean field are compared with each other and also with the preliminary data from the E866/E802 collaboration to search for experimental observables that are sensitive to the equation of state. It is found that these inclusive, single particle observables depend weakly on the equation of state. The difference between results obtained with and without the nuclear mean field is only about 20%. The baryon transverse collective flow in the reaction plane is also analyzed. It is shown that both the flow parameter and the strength of the "bounce-off" effect are very sensitive to the equation of state. In particular, a soft equation of state with a compressibility of 200 MeV results in an increase of the flow parameter by a factor of 2.5 compared to the cascade case without the mean field. This large effect makes it possible to distinguish the predictions from different theoretical models and to detect the signatures of the quark-gluon plasma which is expected to significantly soften the equation of state. PACS number(s): 25.75.+r

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“…Photoluminescence, including fluorescence and phosphorescence as light emitted by electromagnetic radiation, is often used in a wide variety of purposes including fluorescent labeling, 1,2 semiconductor amplifiers, 3,4 solar cells, 5,6 and saturable absorbers. 7 N-Heterocyclic aromatic compounds such as acridine and its derivatives, which have a rigid planar structure and a high quantum yield of fluorescence, have recently generated a great deal of interest because of their use in the production of dyes and some valuable drugs, as well as in fluorescent labeling due to their ability to bind to DNA and RNA.…”

Section: Introductionmentioning

confidence: 99%

Acridine Fluorescence Behaviors in Different Polymeric Microenvironments Directed by C2-Proton-Acidity of Imidazolium-Based Ionic Liquids

Ji¹,

Kim²,

Shin³

2012

Bulletin of the Korean Chemical Society

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A new fluorescent system (acridine/RTIL hybrid gel) confined in the 3D micro-structure of a poly(lactic acid) membrane were prepared from 1-butyl-3-methylimidazolium-based ionic liquids ([bmim]X (X = SbF 6 , NTf 2 , Cl); RTILs), poly(lactic acid) (PLA), and acridine via the sol-gel route. SEM images showed that, in the presence of [bmim]SbF 6 and [bmim]NTf 2 , 3D-ly paticulated structures were created inside the PLA membranes and acridine/RTIL hybrid gels were confined in gabs of particulates. However, the use of [bmim]Cl induced the formation of a 3D-ly porous structure containing the hybrid gel of acridine/[bmimCl in the micropores. The three fluorescent systems exhibited different fluorescence behaviors (fluorescence maximum and intensity) depending on the C2-H acidity scale of the RTILs (or their anion type). Acridine gels hybridized with [bmim]SbF 6 and [bmim]NTf 2 showed blue fluorescence with relative high intensity, whereas the hybrid gel with [bmim]Cl exhibited almost no fluorescence under dry conditions. However, the acridine/[bmim]Cl hybrid system in the micro-porous PLA membrane started to emit fluorescent light under humid conditions and showed a possible response, indicating that it could be applied as a humidity sensor.

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Photoluminescence of plasma polymerized methyl methacrylate films

Cited by 12 publications

References 5 publications

Initiated CVD of Poly(methyl methacrylate) Thin Films

Initiated CVD of Poly(methyl methacrylate) Thin Films

Formation of superdense hadronic matter in high energy heavy-ion collisions

Acridine Fluorescence Behaviors in Different Polymeric Microenvironments Directed by C2-Proton-Acidity of Imidazolium-Based Ionic Liquids

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