The effect of polymer molecular weight and Coumarin 6: solvent interaction on photoluminescence spectra

Mohajerani, Ezeddin; Farajollahi, Farid; Mahzoon, R.

doi:10.1117/12.757736

Cited by 4 publications

(4 citation statements)

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“…The solvent-dependent roughness of the polystyrene surfaces derives from the varying vaporizability of the different solvents. A solvent with high vaporizability causes the solvent to vaporize faster and for the polymer's layer to freeze more quickly, which lead to an increase in layer's thickness [6]. Therefore, chloroform, which has the highest vaporizability, yields the thickest, roughest surface.…”

Section: Resultsmentioning

confidence: 99%

Solvent Effect on Morphology of Polystyrene Coating and their Role to Improvement for Biomolecule Immobilization in Application of QCM Based Biosensor

Masruroh

Djoko

Didik

et al. 2014

AMM

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This research is focused on the synthesis of a polystiren layer for biosensors based on a Quartz Crystal Microbalance sensor (QCM) to immobilize the biomolecule. The polystyrene thin film was deposited by means of spin coating method with various solvents, such as chloroform, toluene, xylene, and tetrahydrofuran (THF), containing a 3% polystyrene solution by mass. The morphologies of the polystyrene layers were observed via SEM/EDx. The polystyrene surface coated using chloroform as the solvent has a rougher morphology and the largest diameter pores compared with the other solvents. The result show the polystyrene surface coating produced with chloroform caused a higher frequency change, which resulted in the binding of a wider range of biomolecules.

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Section: Resultsmentioning

confidence: 99%

Solvent Effect on Morphology of Polystyrene Coating and their Role to Improvement for Biomolecule Immobilization in Application of QCM Based Biosensor

Masruroh

Djoko

Didik

et al. 2014

AMM

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“…Additionally, the excitation energy of DCM-pyran is well below the absorption energy of PMMA and the spin-coating behaviour of PMMA dissolved in toluene has been well-studied. [146][147][148] Finally, PMMA is already used as a protection layer during CVD graphene transfer and as the protection film during photolithography. Therefore, it is well known that PMMA does not damage the graphene sample, it is easily washed away with acetone, and many advanced techniques have been developed to ensure complete contaminant removal, if necessary.…”

Section: Industrial Metrology Of Cvd Graphene Using Fluorescence Quen...mentioning

confidence: 99%

Industrial graphene metrology

Kyle

Ozkan

2012

Nanoscale

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Graphene is an allotrope of carbon whose structure is based on one-atom-thick planar sheets of carbon atoms that are densely packed in a honeycomb crystal lattice. Its unique electrical and optical properties raised worldwide interest towards the design and fabrication of future electronic and optical devices with unmatched performance. At the moment, extensive efforts are underway to evaluate the reliability and performance of a number of such devices. With the recent advances in synthesizing large-area graphene sheets, engineers have begun investigating viable methodologies for conducting graphene metrology and quality control at industrial scales to understand a variety of reliability issues including defects, patternability, electrical, and physical properties. This review summarizes the current state of industrial graphene metrology and provides an overview of graphene metrology techniques. In addition, a recently developed large-area graphene metrology technique based on fluorescence quenching is introduced. For each metrology technique, the industrial metrics it measures are identified--layer thickness, edge structure, defects, Fermi level, and thermal conductivity--and a detailed description is provided as to how the measurements are performed. Additionally, the potential advantages of each technique for industrial use are identified, including throughput, scalability, sensitivity to substrate/environment, and on their demonstrated ability to achieve quantified results. The recently developed fluorescence-quenching metrology technique is shown to meet all the necessary criteria for industrial applications, rendering it the first industry-ready graphene metrology technique.

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“…To understand how the film thickness changes with the amount of added epoxy, a plot of film thickness, measured by the profilometer, is graphed against epoxy concentration. In spin coating, the deposited film is often reported to increase with the precursor concentration due to the increase in viscosity . In Figure , a straight linear was used to merely show that the film grows in thickness in a certain manner with the epoxy content.…”

Section: Resultsmentioning

confidence: 99%

Optimization of amphiphobic structural surface thickness in relation to its functionality on stainless steel plates

Yuan

Lei

et al. 2014

J of Applied Polymer Sci

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Fluorine-based amphiphobic coatings have been widely used in commercial textiles to provide water-and oil-repelling abilities. However, few reports from the literature survey have discussed the surface structural effects of the coated substrate on amphiphobicity. In this research, various thickness amphiphobic coatings based on mixed epoxy, tetraethylorthosilicate, and a particular alkoxysilane with fluorinated side chains (F-silane) were deposited on Grade 420 stainless steel plates. Film amphiphobicity is characterized by measuring the water and oil contact angles of the coating. Film morphology is examined using atomic force microscopy. The deposited films free of F-silane are thinner than 150 nm. The films become thick at high F-silane volume percentage with the surface cavities, ridges, and granules being masked out. On the addition of F-silane, the water contact angle of the deposited films increases up to 105 and then reaches a plateau of 107 with increasing F-silane. In contrast, the oil contact angle increases up to 60 at first and then slowly declines with the F-silane concentration. The total drop of oil contact angle by 20 was attributed to the masking out of surface features on film thickening. This indicates that the surface oleophobicity depends on surface structures. Therefore, improving surface amphiphobicity correlates with creating more refined multiscale surface structures during the industrial manufacturing process of steel plate, prior to surface modification by F-silane.

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The effect of polymer molecular weight and Coumarin 6: solvent interaction on photoluminescence spectra

Cited by 4 publications

References 1 publication

Solvent Effect on Morphology of Polystyrene Coating and their Role to Improvement for Biomolecule Immobilization in Application of QCM Based Biosensor

Solvent Effect on Morphology of Polystyrene Coating and their Role to Improvement for Biomolecule Immobilization in Application of QCM Based Biosensor

Industrial graphene metrology

Optimization of amphiphobic structural surface thickness in relation to its functionality on stainless steel plates

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