Hydrogen-terminated silicon surface
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Since all surface Si atoms are fully co-ordinated, hydrogen termination leads to enhanced stability in ambient environments, unlike a 'clean surface' having unpassivated surface atoms, or dangling bonds. It is relatively inert and can be handled in air without special care for several minutes.
A hydrogen-terminated silicon surface can be flattened at the atomic level by etching. For example, to etch a hydrogen-terminated silicon(111) surface, ammonium fluoride aqueous solution or boiling water can be used.
Like other silyl groups of organic compounds, the H-Si groups on the surface react with molecules that have terminal unsaturated bonds or diazo groups. The reaction is called hydrosilylation. Many kinds of organic compounds with various functions can be introduced onto the silicon surface by the hydrosilylation of a hydrogen-terminated surface.
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