Nanoscale chemical mapping of laser-solubilized silk
Nanoscale chemical mapping of laser-solubilized silk
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DOI：
10.1088/2053-1591/aa98a9
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发表时间：
2017-08
影响因子：
2.3
通讯作者：
M. Ryu;Hanae Kobayashi;A. Balčytis;Xuewen Wang;J. Vongsvivut;Jingliang Li;Norio Urayama;V. Mizeikis;M. Tobin;S. Juodkazis;J. Morikawa
中科院分区：
文献类型：
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作者：
M. Ryu;Hanae Kobayashi;A. Balčytis;Xuewen Wang;J. Vongsvivut;Jingliang Li;Norio Urayama;V. Mizeikis;M. Tobin;S. Juodkazis;J. Morikawa
利用超短激光脉冲辐照制备了水溶性无定形蚕丝，并通过纳米红外光谱进行了检测。一个光学吸收诱导的纳米级的表面膨胀进行了探测，以产生的光谱响应的丝绸在红外分子指纹波长与一个高的20 nm的空间分辨率所定义的探针的尖端。制备厚度为1-5 μm的丝切片用于纳米级光谱学，并使用激光诱导非晶化。通过桌面和同步辐射傅里叶变换红外光谱进行的丝绸吸光度测量的比较证明，在高空间分辨率和特异性（能够区分无定形和结晶丝绸）的化学成像是可靠的实现纳米级IR。吸收率和光谱线的形状的频带的差异有关的不同灵敏度的应用方法的真实的和虚部的介电常数。讨论了同步辐射红外和纳米红外相结合的纳米材料表征方法。
A 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.