School of Physics and Astronomy, University of Nottingham, Nottingham, NG7 2RD, UK.
Nanotechnology. 2017 Feb 17;28(7):075302. doi: 10.1088/1361-6528/28/7/075302. Epub 2017 Jan 11.
The atomistic structure of the tip apex plays a crucial role in performing reliable atomic-scale surface and adsorbate manipulation using scanning probe techniques. We have developed an automated extraction routine for controlled removal of single hydrogen atoms from the H:Si(100) surface. The set of atomic extraction protocols detect a variety of desorption events during scanning tunneling microscope (STM)-induced modification of the hydrogen-passivated surface. The influence of the tip state on the probability for hydrogen removal was examined by comparing the desorption efficiency for various classifications of STM topographs (rows, dimers, atoms, etc). We find that dimer-row-resolving tip apices extract hydrogen atoms most readily and reliably (and with least spurious desorption), while tip states which provide atomic resolution counter-intuitively have a lower probability for single H atom removal.
针尖的原子结构在使用扫描探针技术进行可靠的原子级表面和吸附物操纵方面起着至关重要的作用。我们已经开发了一种自动提取程序，用于从 H:Si(100)表面可控地去除单个氢原子。该组原子提取方案在扫描隧道显微镜（STM）诱导的氢钝化表面修饰过程中检测到各种解吸事件。通过比较各种 STM 形貌（行、二聚体、原子等）的解吸效率，研究了针尖状态对氢去除概率的影响。我们发现，二聚体行分辨针尖尖端最容易且可靠地提取氢原子（且具有最少的虚假解吸），而提供原子分辨率的针尖状态出人意料地具有较低的单 H 原子去除概率。
