laser增溶蚕丝的纳米级化学作图
Nanoscale chemical mapping of laser-solubilized silk
摘要：
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表面膨胀探测产生的光谱响应的丝绸在红外分子指纹波长与高~20 nm的空间分辨率所定义的探针的尖端。制备厚度为1-5微米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）的化学成像是可靠的实现纳米IR。使用同步辐射红外辐射的纳米材料表征进行了讨论。
英文摘要：
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 micrometers 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. A nanoscale material characterization using synchrotron IR radiation is discussed.
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