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Please use this identifier to cite or link to this item: http://hdl.handle.net/10119/13687

Title: 構造を規定した酸化物表面をテンプレートにした水分子の結晶化に対する電場効果の解明
Other Titles: Study of Crystallization of H2O molecules on Well-defined Oxide Surfaces
Authors: 笹原, 亮
Authors(alternative): Sasahara, Akira
Keywords: 固液界面
Issue Date: 3-Jun-2016
Abstract: 表面原子を周期配列させた(構造を規定した)酸化物表面に水中で電場を発生させ、表面を鋳型として水分子を結晶化させることを目標とした。超高真空(UHV)中で作製した二酸化チタン(110)-(1×1)表面を高圧水蒸気、大気、水に暴露した後、UHVに再導入して構造・組成を解析した。(1×1)構造が高湿度環境で安定であることを明らかにし、(1×1)表面が鋳型として有望であると結論した。また、UHVへの導入時に水分子が解離して、その生成物が(1×1)表面に吸着することを見出した。水分子由来の表面種を特定できたことで、含水ガスや水溶液から吸着する原子・分子をUHV中で高感度・高空間分解能に解析できる。 : The aim of this study is to fabricate H2O crystals by using atomically well-defined oxide surfaces as atomic scale templates. By applying a high electric field to the template surfaces in water, H2O crystals with non-equilibrium structures may be obtained. It was found that the titanium dioxide (110)-(1×1) surface prepared in ultrahigh vacuum (UHV) maintained its atomic structure in laboratory air and water. The (1×1) surface is therefore a promising candidate for the template. When the (1×1) surfaces exposed to the humid environments were reintroduced to UHV, hydroxyl groups, hydroperoxyl groups, and O adatoms were present on the surfaces. These surface species were concluded to be formed by dissociation of H2O molecules coordinated to the (1×1) surface. The identification of the evacuation-induced species opens the door to the characterization of the (1×1) surfaces in aqueous solutions by surface-sensitive techniques in UHV.
Description: 挑戦的萌芽研究
Language: jpn
URI: http://hdl.handle.net/10119/13687
Appears in Collections:平成27年度 (FY 2015)

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