Significant control of metal-insulator transition temperature through catalytic excessive oxygen doping in high-performance vanadium dioxide nanobeam channel  

作　　者：Minhwan Ko Sang Yeon Lee Jucheol Park Hyungtak Seo 

机构地区：[1]Department of Energy Systems Research,Ajou University,Suwon,16499,Republic of Korea [2]Gyeongbuk Science Technology Promotion Center,Gumi Electronics&Information Technology Research Institute,Gumi,39717,Republic of Korea [3]Department of Materials Science and Engineering,Ajou University,Suwon,16499,Republic of Korea

出　　处：《Journal of Materials Science & Technology》2020年第9期96-101,共6页材料科学技术（英文版）

基　　金：This study was supported through the National Research Foundation of Korea[NRF-2019M3F3A1A03079739 and NRF-2019R1A2C2003804]of the Ministry of Science and ICT,Republic of Korea.This study was partially supported by Leaders in Industryuniversity Cooperation+Project,supported by the Ministry of Education,Republic of Korea and by Ajou University.Minhwan Ko and Sang Yeon Lee contributed equally to this study.

摘　　要：The strategy of a reliable transition temperature control of vanadium dioxide(VO2)is reported.Rectangular VO2 nanobeams were synthesized by a thermal chemical vapor deposition(TCVD)system.The metal-insulator transition(MIT)temperature increases to above 380K when the TiO2 ratio of the source is 5 at.%,although the Ti source is not physically doped into VO2 nanobeams.The XPS spectra of the V 2p orbital reveal the excessive oxidation of V after the TCVD processes with a higher TiO2 ratio,indicating that the TiO2 precursor is important in the O-doping of the surface V O bonds when forming volatile Ti-O gas species.Thus,TiO2 reactants can be used as a VO2 surface chemical modifier to manipulate the MIT transition temperature and maintain a homogenous VO2 phase,which is useful for a Mott device application with a record on/off switching ratio>104 and Mott transition temperature>380 K.

关 键 词：VO2 Mott transition Metal-insulator transition temperature Oxygen doping Titanium catalyst 

分 类 号：TB383.1[一般工业技术—材料科学与工程]