File(s) under permanent embargo
Nanoscale chemical mapping of laser-solubilized silk
journal contribution
posted on 2017-11-01, 00:00 authored by M Ryu, H Kobayashi, A Balčytis, X Wang, J Vongsvivut, Jingliang LiJingliang Li, N Urayama, V Mizeikis, M Tobin, S Juodkazis, J MorikawaA water soluble amorphous form of silk was made by ultra-short laser pulse irradiation and detected by nanoscale IR mapping. An optical absorption-induced nanoscale surface expansion was probed to yield the spectral response of silk at IR molecular fingerprinting wavelengths with a high ∼ 20 nm spatial resolution defined by the tip of the probe. Silk microtomed sections of 1-5 μm in thickness were prepared for nanoscale spectroscopy and a laser was used to induce amorphisation. Comparison of silk absorbance measurements carried out by table-top and synchrotron Fourier transform IR spectroscopy proved that chemical imaging obtained at high spatial resolution and specificity (able to discriminate between amorphous and crystalline silk) is reliably achieved by nanoscale IR. Differences in absorbance and spectral line-shapes of the bands are related to the different sensitivity of the applied methods to real and imaginary parts of permittivity. A nanoscale material characterization by combining synchrotron IR radiation and nano-IR is discussed.
History
Journal
Materials research expressVolume
4Issue
11Article number
115028Pagination
1 - 6Publisher
IOP PublishingLocation
Bristol, Eng.Publisher DOI
eISSN
2053-1591Language
engPublication classification
C Journal article; C1 Refereed article in a scholarly journalCopyright notice
2017, IOP Publishing LtdUsage metrics
Categories
No categories selectedKeywords
Licence
Exports
RefWorks
BibTeX
Ref. manager
Endnote
DataCite
NLM
DC