Hydrogenation-induced surface polarity recognition and proton memory behavior at protic-ionic-liquid/oxide electric-double-layer interfaces.
Hydrogenation-induced surface polarity recognition and proton memory behavior at protic-ionic-liquid/oxide electric-double-layer interfaces.
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DOI：
10.1021/ja909110s
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发表时间：
2010-04
影响因子：
15
通讯作者：
Hongtao Yuan;H. Shimotani;A. Tsukazaki;A. Ohtomo;M. Kawasaki;Y. Iwasa
中科院分区：
文献类型：
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作者：
Hongtao Yuan;H. Shimotani;A. Tsukazaki;A. Ohtomo;M. Kawasaki;Y. Iwasa
在液/固界面形成的双电层(EDL)在电化学、光化学、催化剂、储能和电子学方面具有广泛的跨学科吸引力。特别是近年来，由于EDL具有高密度电荷积累的能力，人们对EDL晶体管结构的基本认识和实际应用投入了很大的努力。然而，开发这种新兴界面的额外新功能不仅非常重要，而且是一个巨大的挑战。在这里，我们证明，通过引入质子离子液体(PIL)作为氧化锌EDL晶体管(EDLTS)的栅电介质，质子和羟基等化学活性小离子可以作为吸附介质来扩展EDLTS的界面功能。通过电场选择性地将H(+)或OH(-)基团驱动到氧化锌通道表面，带电的吸附物以不同的吸附机制与表面原子相互作用，表现出显著的电子输运变化，为识别表面极性提供了可能。最重要的是，PIL-EDLTS的传输特性具有很大的滞后性，这使得这种器件可以通过表面氢化和脱氢过程用于非挥发性质子存储器件。这一发现为我们理解液/固非均相界面现象和通过可控的界面相互作用扩展EDLS的实用功能提供了新的机会。
The electric-double-layer (EDL) formed at liquid/solid interfaces provides a broad and interdisciplinary attraction in terms of electrochemistry, photochemistry, catalysts, energy storage, and electronics. Especially in recent years, much effort has been devoted to the fundamental understanding and practical applications of transistor configurations with EDLs because of their ability for high-density charge accumulation. However, to exploit additional new functionalities of such an emerging interface is not only of great importance but also a huge challenge. Here, we demonstrate that, by introducing protic ionic liquid (PIL) as the gate dielectric for ZnO EDL transistors (EDLTs), small and chemically active ions, such as protons and hydroxyls, can serve as an adsorption medium to extend the interfacial functionalities of EDLTs. By selectively driving the H(+) or OH(-) groups onto ZnO channel surfaces with an electric field, the charged adsorbates interact with surface atoms in different adsorption mechanisms, showing remarkable variations in electron transport and providing a possibility for the recognition of surface polarity. Most significantly, the large hysteresis in the transfer characteristics of PIL-EDLTs makes the device available and promising for nonvolatile proton memory devices via surface hydrogenation and dehydrogenation processes. Such a finding provides us with new opportunities to understand liquid/solid heterogeneous interface phenomena and to extend the practical functions of EDLs through controllable interfacial interaction.