臺灣國際科展

可調式光電元件:奈米線與液晶的結合

科展類別
臺灣國際科展
屆次
2008年
科別
物理與太空科學
學校名稱
臺北市立松山高級中學
指導老師
蔡皓偉
作者
陳姿蓓
關鍵字
奈米線 液晶

摘要或動機

藉由結合液晶與奈米線,本研究設計出新型的光電元件,我們發現這些新設計具有先前元件很難達到的新穎特性。首先,我們研究液晶分子與一維磁性奈米線之結合,很有趣的是磁性奈米線在液晶元件內,會沿著液晶方向作整齊排列,更重要的是經由一外加電場,即可調控磁性奈米線之磁場方向。藉由電場調控磁場,是很久以來許多科學家追求的目標,然而成效不彰,本研究提供了一個簡便的方法,克服了長久以來的障礙。第二個例子,我們研究液晶分子與一維半導體奈米線結合之元件,我們證實了半導體奈米線所發射瑩光之電場偏極方向,可以經由外加電場來調控,這個特性對於資訊科技的應用,將很有用處。本研究所觀測到之結果,皆可利用下列事實來理解,奈米線具有很大的表面積,因而增加了與液晶分子之交互作用,經由此增大的交互作用力,奈米線會沿著液晶分子方向排列。值得強調的是,本研究利用了已成熟的液晶顯示器技術,其未來應用性將有很大潛力。New devices based on the composites of liquid crystals and one dimensional nanowires have been designed, fabricated, and characterized. It is discovered that these novel devices own interesting properties that are very difficult to be obtained by conventional ones. As the first example, the liquid crystal device with built-in one dimensional magnetic nanowires has been studied. It is found that the magnetic nanowires can be well aligned along the orientation of liquid crystal molecules. Quite interestingly, the direction of the magnetization of magnetic nanowires can be easily manipulated by an external electric field at room temperature. The phenomenon of electric manipulation of magnetization has been studied since nineteen century, but the achievement is rather limited. Here, we provide a convenient alternative to overcome the long quest search. For the second example, the liquid crystal device with built-in semiconductor nanowires has been investigated. We demonstrate that the polarization of the emission arising from semiconductor nanowires can be easily controlled by an external electric field, which is one of the basic requirements for information technology. All of our observed results can be well understood in terms of the inherent nature of a large surface to volume ratio of one dimensional nanowires, which induces a strong interaction between embedded nanowires and liquid crystal molecules. Therefore, the nanowires can be driven along the orientation of liquid crystal molecules. It is stressed here that our newly designed devices are based on the well established liquid crystal display technology and therefore their practical application can be realized in the near future.


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