文章基本信息

标题：Microstructural analysis and Transport Properties of MoO and MoC nanostructures prepared by focused electron beam-induced deposition
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作者：Kazumasa Makise ; Kazutaka Mitsuishi ; Masayuki Shimojo 等
期刊名称：Scientific Reports
电子版ISSN：2045-2322
出版年度：2015
卷号：4
期号：1
DOI：10.1038/srep05740
语种：English
出版社：Springer Nature
摘要：By electron-beam-induced deposition, we have succeeded in the direct fabrication of nanowires of molybdenum oxide (MoO_x) and molybdenum carbide (MoC) on a SiO₂ substrate set in a scanning electron microscope. In order to prepare MoO_x specimens of high purity, a precursor gas of molybdenum hexacarbonyl [Mo(CO)₆] is used, mixed with oxygen gas. On the other hand, MoC is grown by mixing H₂O gas with the precursor gas. The electrical transport properties of the nanowires are investigated by the DC four-terminal method. A highly resistive MoO_x nanowire prepared from an as-deposited specimen by annealing in air shows nonlinear current-voltage characteristics and a high photoconductivity. The resistivity ρ of an as-deposited amorphous MoC (a-MoC) nanowire takes its maximum at a temperature T ≈ 10 K and decreases to ≈ 0 with decreasing temperature. This behavior of ρ ( T ) indicates the possible occurrence of superconductivity in a-MoC nanowires. The characteristic of ρ ( T ) below the superconducting transition temperature T _c ≈ 4 K can be well explained by the quantum phase-slip model with a coherence length ξ (0) ≈ 8 nm at T = 0.