2024

01-07

扫描隧道显微镜针尖的制作方法概述(一)

The size, shape, and chemical identity of STM needle tips not only affect the resolution and shape of scanning tunneling microscope images, but also affect the measured electronic states. The commonly used STM tip materials include tungsten (W), nickel (Ni), platinum iridium (Pt Ir), silver (Ag), and gold (Au) [2]. Various STM tip preparation methods can be mainly divided into two categories: (I) mechanical and (II) physical and chemical. Mechanical preparation methods include shearing, metal processing, and breaking metal wires into fragments to obtain sharp needle tips. The needle tips prepared by these methods are often difficult to reproduce, with problems such as shape asymmetry or multiple needle tip arrangements. When scanning an uneven sample surface, it is difficult to obtain the correct surface morphology with these needle tips. When preparing needle tips using physical and chemical methods, clear shapes can be obtained by adjusting process parameters. The technologies used in this process include electrochemical corrosion, electrochemical polishing, ion milling, and electron beam deposition [3]. At present, tungsten needle tips, nickel needle tips, silver needle tips, and gold needle tips are commonly prepared by electrochemical corrosion method, while platinum iridium wire needle tips are commonly prepared by shear method. Spin polarized scanning tunneling microscopy is an emerging surface spin resolution technique, and one of the key steps in SP-STM experiments is to prepare magnetic needle tips that can generate spin polarized electrons. These can be prepared directly from magnetic materials or by coating magnetic thin films on non-magnetic needle tips.

2023

09-30

【Cryogen-free LT-SPM SYS】<br>Development of a cryogen-free sub-3 K low-temperature scanning probe microscope by remote liquefaction scheme

author:Ruisong Ma;Hao Li;Chenshuai Shi;Fan Wang;Le Lei;Yuanzhi Huang;Yani Liu;Huan Shan;Li Liu;Shesong Huang;Zhi-Chuan Niu;Qing Huan;Hong-Jun Gao

2023

02-23

【ALD SYS】<br>Conjugated dual size effect of core-shell particles synergizes bimetallic catalysis

Authors:Xiaohui Zhang<sup>1,3</sup>, Zhihu Sun <sup>2,3</sup>,RuiJin<sup>1,3</sup>, Chuwei Zhu<sup>1,3</sup>, Chuanlin Zhao<sup>1</sup>, Yue Lin <sup>1</sup>,QiaoqiaoGuan<sup>1</sup>,LinaCao <sup>1</sup>, Hengwei Wang <sup>1</sup>, Shang Li<sup>1</sup>, Hancheng Yu<sup>1</sup>,Xinyu Liu<sup>1</sup>,LeileiWang<sup>1</sup>,ShiqiangWei <sup>2</sup> ,Wei-XueLi <sup>1</sup> Junling Lu <sup>1</sup>

2022

07-11

【LT-STM SYS】<br>Experimental Realization of Atomic Monolayer Si<sub>9</sub>C<sub>15</sub>

Authors:Zhao-Yan Gao, Wenpeng Xu, Yixuan Gao, Roger Guzman, Hui Guo, Xueyan Wang, Qi Zheng, Zhili Zhu, Yu-Yang Zhang, Xiao Lin, Qing Huan, Geng Li, Lizhi Zhang, Wu Zhou, Hong-Jun Gao

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