Vol. 50, No. 1（論文特集: 2025年度静電気学会全国大会）

レター

静電引上結晶成長によるPt/Ir探針製作の研究
Fabrication of Pt/Ir Probe by Electrostatic Stress-driven Pull-up Crystal Growth

西村　高志，松本　乃武
Takashi NISHIMURA and Nobu MATSUMOTO

静電気学会誌　第50巻　第1号　pp. 26 - 29
2025年9月11日受付
2025年10月30日受理
DOI   https://doi.org/10.34342/iesj.2026.50.1.26

Abstract
Pt/Ir probe was fabricated by heating the tip of polycrystalline Pt/Ir wire with a laser irradiation to form a melt and then applying a high voltage to the melt, causing the melt to pull-up grow due to electrostatic stress. When the applied high voltage was -12 kV, the Pt/Ir tip grew into a curved shape with a tip curvature radius of 25.9 μm. As the high voltage was increased from -15 kV to -25 kV, the melt was strongly pulled up by electrostatic stress, resulting in a tip curvature radius of approximately 400 nm. At a high voltage of -19 kV, the tip curvature radius of the Pt/Ir wire reached a minimum of 245 nm, with the tip surrounded by facet surfaces. These results demonstrate that the electrostatic stress-driven pull-up crystal growth can be used to sharpen Pt/Ir wire.

Keywords
静電応力，レーザ溶融，テイラーコーン，金属探針，ファセット面