Development of new techniques for scanning electron microscope observation using ionic liquid
Development of new techniques for scanning electron microscope observation using ionic liquid
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DOI：
10.1016/j.electacta.2008.01.001
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发表时间：
2008-09-01
影响因子：
6.6
通讯作者：
Kuwabata, Susumu
中科院分区：
文献类型：
--
作者：
Arimoto, Satoshi;Sugimura, Masaharu;Kuwabata, Susumu
基于我们以前的发现，离子液体（IL）可以观察到的扫描电子显微镜（SEM）没有充电的液体，我们已经开发了几种新的技术，SEM观察。用IL涂覆绝缘样品可用于向样品提供电子导电性，如通过真空气相沉积的金属或碳涂层。在这种情况下，用适当的挥发性溶剂如酒精稀释IL对于在样品上涂覆IL薄层是有效的。以海藻为生物样品，对含IL的海藻进行了扫描电镜观察。将被水溶胀的海藻叶放入IL浴中，并将该浴放入脱气的干燥器中以用IL替换海藻叶中的水。所得样品给出了溶胀海藻的SEM图像，其厚度是干燥海藻的数倍。此外，在真空室中引入IL使我们能够开发原位电化学SEM观察系统。使用该系统，我们观察到聚吡咯膜的氧化还原反应和银的电化学沉积及其氧化溶解引起的膜厚度的变化。还发现，能量色散X射线荧光（EDX）分析是可用的，即使在IL极化的电极。(c)2008年爱思唯尔有限公司保留所有战斗。
Based on our previous discovery that ionic liquid (IL) can be observed by a scanning electron microscope (SEM) without charging the liquid, we have developed several novel techniques for SEM observation. Coating of insulating sample with IL is useful for providing electronic conductivity to the samples like metal or carbon coating by vacuum vapor deposition. In this case, dilution of the IL with appropriate volatile solvent like alcohol is effective for coating thin layer of IL on the sample. As a biological sample, seaweed including IL was attempted to be observed by SEM. A seaweed leaf swollen by water was put in an IL bath and the bath was put in an outgassed desiccator to replace water in the seaweed leaf with IL. The resulting sample gave a SEM image of the swollen seaweed whose thickness was several times larger than dried one. Furthermore, the introduction of the IL in vacuum chamber allowed us to develop the in situ electrochemical SEM observation system. Using this system, we observed changes in polypyrrole film thickness caused by the redox reaction of the film and the electrochemical deposition of silver and its oxidative dissolution. It was also found that the energy dispersive X-ray fluorescence (EDX) analysis was available even for the electrode polarized in IL. (c) 2008 Elsevier Ltd. All fights reserved.