Vibrational Spectroscopy of Water with High Spatial Resolution
Vibrational Spectroscopy of Water with High Spatial Resolution
复制标题
DOI：
10.1002/adma.201802702
复制
发表时间：
2018-09-06
影响因子：
29.4
通讯作者：
Klie, Robert F.
中科院分区：
文献类型：
--
作者：
Jokisaari, Jacob R.;Hachtel, Jordan A.;Klie, Robert F.
以纳米空间分辨率检查液体振动光谱的能力将极大地扩展研究液体和液体界面的潜力。事实上，水的基本性质，包括其相图的复杂性，电化学，以及由于纳米级限制的键合是当前的研究课题。对于任何液体，直接调查有序的液体结构，界面双层，和吸附物种在液-固界面的兴趣。在这里，一种新的方式来表征的振动特性的液体水与高空间分辨率使用透射电子显微镜报道。通过将水封装在两片氮化硼之间，证明了捕获振动光谱以量化液体结构、其与液体电池表面相互作用的能力，以及使用电子能量损失光谱识别包括H2O和D2 O在内的同位素的能力。这里使用的电子显微镜，配备了高能量分辨率单色仪，能够记录液体和分子的振动光谱，并在纳米和微米尺度上对表面和体积形态学特性敏感。这些结果代表了一个重要的里程碑，液体和同位素标记的材料表征与高空间分辨率，结合纳米级成像与振动光谱。
The ability to examine the vibrational spectra of liquids with nanometer spatial resolution will greatly expand the potential to study liquids and liquid interfaces. In fact, the fundamental properties of water, including complexities in its phase diagram, electrochemistry, and bonding due to nanoscale confinement are current research topics. For any liquid, direct investigation of ordered liquid structures, interfacial double layers, and adsorbed species at liquid-solid interfaces are of interest. Here, a novel way of characterizing the vibrational properties of liquid water with high spatial resolution using transmission electron microscopy is reported. By encapsulating water between two sheets of boron nitride, the ability to capture vibrational spectra to quantify the structure of the liquid, its interaction with the liquid-cell surfaces, and the ability to identify isotopes including H2O and D2O using electron energy-loss spectroscopy is demonstrated. The electron microscope used here, equipped with a high-energy-resolution monochromator, is able to record vibrational spectra of liquids and molecules and is sensitive to surface and bulk morphological properties both at the nano- and micrometer scales. These results represent an important milestone for liquid and isotope-labeled materials characterization with high spatial resolution, combining nanoscale imaging with vibrational spectroscopy.