Oxidative vaporization etching for molybdenum tip formation in air

被引：8

作者：

Goto, Yuto ^{[1
]}

Suizu, Rie ^{[2
]}

Noguchi, Yutaka ^{[3
]}

Yamada, Toyo Kazu ^{[1
,4
]}

机构：

[1] Chiba Univ, Dept Mat Sci, Inage Ku, 1-33 Yayoi Cho, Chiba 2638522, Japan

[2] Nagoya Univ, Dept Chem, Chikusa Ku, Furo Cho, Nagoya, Aichi 4648602, Japan

[3] Meiji Univ, Sch Sci & Technol, Kawasaki, Kanagawa 2148571, Japan

[4] Chiba Univ, Mol Chiral Res Ctr, Inage Ku, 1-33 Yayoi Cho, Chiba 2638522, Japan

来源：

APPLIED SURFACE SCIENCE | 2021年 / 542卷

关键词：

Molybdenum; Tip probe; Oxidative vaporization; Molybdenum oxides; Scanning tunneling microscopy; Conductance; SCANNING-TUNNELING-MICROSCOPY; TUNGSTEN TIPS; CONDUCTANCE; CU(111); ATOMS; STM; MO;

D O I：

10.1016/j.apsusc.2020.148642

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Oxidative vaporization in air using a flame with a temperature range of 1950-2300 K was employed for controlling the tip shape made from a nipper-cut metal molybdenum (Mo) wire edge. An extremely high vapor pressure of MoO3 generated on the Mo surface in flame is a driving force behind the tip shape formation. Since the MoO3 vaporization rate follows the flame temperature gradient, we could control the tip apex shape by selecting the proper flame etching condition. The best condition to obtain a sharp tip apex based on statistical tests of dozens of Mo tips was obtained by Mo wire edge insertion into the 2100 K flame from the side for one second. This was repeated twice, which reproducibly provided a tip apex with a radius of 50-100 nm and a cone angle of 20-30 degrees. The present Mo tips, fabricated without aqueous solutions, were examined for their suitability as probe tips through air-scanning tunneling microscopy (STM), ultrahigh vacuum STM, field emission spectroscopy, and conductance measurements.

引用

页数：8

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