Abstract
Scanning tunneling microscope results showed that Au and Fe atoms were steamed on the Si (111)-(7 × 7) substrate surface, with or without the step region. The experimental comparison proved that the induced effect of the step region is a controllable process, which CH3OH can adjust. In this paper, the latest progress on the dynamic phenomenon on the step region is discussed, including three deposition types: strong deposition, weak deposition, and the new quasi deposition. With a relatively weak interaction between Au and Si atoms, the linearity of the weak deposition is present in the step region. In contrast, Fe atoms tend to form a strong deposition along the boundary line between the flat and step regions. Different depositions correspond to different surface potential energy: a newly formed surface is stabilized by a quasi-potential made by breaking, and a metal atomic structure can be stabilized by forming several quasi depositions. After discussing the good adsorption properties, CH3OH can be used as an intermediate layer on the step region. As an important result of quasi deposition, a regular linear Fe cluster structure is created, which is perpendicular to the boundary line.
Highlights
With the progression of atomic-level testing technology [1,2], a series of interesting dynamic phenomena [3,4] on the solid surface, such as the formation of typical structures and fluctuation of the step region [5,6], have been found
In this study, where we examined a series of interesting phenomena on the flat and stepped region, the law of metal deposition was gradually discovered and deduced
The metal deposition on the step region of the Si (111)-(7 × 7) surface is a typical case [22], that is, if the interaction among the metal and Si atoms involves an induction process, the formation of a metal atomic structure is difficult to explain without considering the change in surface potential energy [23,24,25]
Summary
With the progression of atomic-level testing technology [1,2], a series of interesting dynamic phenomena [3,4] on the solid surface, such as the formation of typical structures and fluctuation of the step region [5,6], have been found. Each triangle structure can be divided into a top layer and a rest layer, which have fixed adsorption/deposition sites. Among them, those on the top layer are called corner sites and center sites, and those on the rest layer are called rest sites. Its atomic structure growth is significant to the study of metal deposition [7,8] Despite such theoretical and functional values, there are a very limited number of application cases that can exactly reach the atomic level. This is partially due to the difficulties in obtaining stable, regular, and high-density atomic structures. As the size of the metal deposition decreases to a certain extent (around 10 nm), some unique phenomena follow, such as the small-size effect, surface effect, and so on [9,10]
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