Effect of electron radiation on polymer matrix systems

Hickey, Gregory S.

doi:10.1016/0040-6031(91)87162-p

Cited by 2 publications

(2 citation statements)

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“…That was likely a result of the stress cracking of the conductive iridium top coating required for SEM imaging, which is known to occur upon electron radiation due to a mismatch of thermal expansion (between iridium and pHEMA coatings in this case). 35,36 To our best knowledge, this was the first direct observation of conformal ultrathin iCVD coatings on nanopores with ultrahigh aspect ratios. Although conformal iCVD coatings have been visualized on microtrenches (with width of ∼1 μm and aspect ratios of ∼10), 12,13 the direct observation of ultrathin coatings on nanoscale pores or on structures with such high aspect ratios has not been achieved.…”

Section: Resultsmentioning

confidence: 85%

“…In the SEM images, crevices were observed on the pHEMA coating (Figure C) but not on the AAO membranes. That was likely a result of the stress cracking of the conductive iridium top coating required for SEM imaging, which is known to occur upon electron radiation due to a mismatch of thermal expansion (between iridium and pHEMA coatings in this case). , …”

Section: Resultsmentioning

confidence: 99%

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Kinetics of All-Dry Free Radical Polymerization under Nanoconfinement

et al. 2020

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Conformal coating of ultrahigh-aspect-ratio nanostructures with functional polymer thin films is highly desirable in many applications, ranging from biosensing to energy storage. Nevertheless, achieving uniform surface coverage on nanostructures is challenging due to the difficulty of controlling molecular transport and reaction kinetics under nanoconfinement. Here we demonstrated the conformal coverage of ultrahigh-aspect-ratio nanopores by polymer nanolayers deposited using initiated chemical vapor deposition (iCVD) and unraveled the fundamental mechanisms governing the coating growth kinetics under nanoconfinement. A molecular-collision model was developed by using statistical methods and validated by systematic kinetic experiments. The results indicated that nanoconfinement amplified radical− surface collisions, resulting in higher effective radical concentration. The approach for validating the molecular-collision model can be broadly adopted to study vapor-based reaction systems without needing extensive nanofabrication or characterization instruments. Together, the results reported here could improve the control over nanocoating growth during nanostructured material/device fabrications across industries of manufacturing, healthcare, and sustainability.

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