標題: Revealing Controllable Nanowire Transformation through Cationic Exchange for RRAM Application
作者: Huang, Chun-Wei
Chen, Jui-Yuan
Chiu, Chung-Hua
Wu, Wen-Wei
材料科學與工程學系
Department of Materials Science and Engineering
關鍵字: Cationic exchange;RRAM;in situ TEM;ZnO;TiO2;axial nanowire heterostructures
公開日期: 1-May-2014
摘要: One dimensional metal oxide nanostructures have attracted much attention owing to their fascinating functional properties. Among them, piezoelectricity and photocatalysts along with their related materials have stirred significant interests and widespread studies in recent years. In this work, we successfully transformed piezoelectric ZnO into photocatalytic TiO2 and formed TiO2/ZnO axial heterostructure nanowires with flat interfaces by solid to solid cationic exchange reactions in high vacuum (approximately 10(-8) Torr) transmission electron microscope (TEM). Kinetic behavior of the single crystalline TiO2 was systematically analyzed. The nanoscale growth rate of TiO2 has been measured using in situ TEM videos. On the basis of the rate, we can control the dimensions of the axial-nanoheterostructure. In addition, the unique Pt/ ZnO / TiO2/ ZnO /Pt heterostructures with complementary resistive switching (CRS) characteristics were designed to solve the important issue of sneak-peak current. The resistive switching behavior was attributed to the migration of oxygen and TiO2 layer served as reservoir, which was confirmed by energy dispersive spectrometry (EDS) analysis. This study not only supplied a distinct method to explore the transformation mechanisms but also exhibited the potential application of ZnO/TiO2 heterostructure in nanoscale crossbar array resistive random-access memory (RRAM).
URI: http://dx.doi.org/10.1021/nl500749q
http://hdl.handle.net/11536/24450
ISSN: 1530-6984
DOI: 10.1021/nl500749q
期刊: NANO LETTERS
Volume: 14
Issue: 5
起始頁: 2759
結束頁: 2763
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