Nanoscale Icelike Water Layer on a Diamond Surface under Ambient Conditions

Area of Science:

• Surface science
• Materials science
• Nanotechnology

Background:

• The chemical environment at interfaces is crucial for low-dimensional materials.
• Surface adsorbates and water layers are common but difficult to characterize at the atomic scale under non-ultrahigh vacuum conditions.

Purpose of the Study:

• To develop a method for in situ characterization of nanoscale adsorbate layers on solid surfaces.
• To investigate the structure and dynamics of adsorbates and interfacial water on diamond surfaces under ambient conditions.

Main Methods:

• Utilized shallow nitrogen-vacancy centers in diamond for nanoscale characterization.
• Employed a dissection method to quantitatively analyze adsorbate layers.
• Investigated surface properties under ambient, non-ultrahigh vacuum conditions.

Main Results:

• Identified a tightly bound organic adsorbate layer coexisting with an icelike interfacial water layer on diamond surfaces.
• Demonstrated that the rigidity of the interfacial water layer is influenced by interactions with specific surface sites, like dangling bonds.
• Revealed distinct structural and dynamical signatures of nanoscale adsorbate layers.

Conclusions:

• The developed method enables quantitative characterization of low-dimensional adsorbates under native conditions.
• Surface adsorbates and interfacial water significantly modulate surface properties.
• Understanding these interfacial phenomena is key for designing advanced materials.