Temporospatial Control of Graphene Wettability

Area of Science:

• Materials Science
• Surface Science
• Nanotechnology

Background:

• Graphene oxide (GO) is a derivative of graphene with tunable properties.
• Adatom migration on 2D materials is crucial for understanding surface dynamics and device performance.
• Controlling surface properties like wettability is essential for various applications.

Purpose of the Study:

• To experimentally demonstrate the reversible migration of adatoms on graphene.
• To investigate the role of electrical bias in adatom migration.
• To correlate adatom migration with changes in graphene's surface properties, specifically wettability.

Main Methods:

• Utilized single-layer graphene oxide with partial oxygen adatom coverage.
• Applied electrical bias to induce and observe adatom migration.
• Employed Raman spectroscopy, analyzing the intensity ratio of G and G' modes, to quantify oxygen adatom migration.

Main Results:

• Successfully demonstrated reversible migration of oxygen adatoms along the basal plane of graphene oxide under electrical bias.
• Quantified adatom migration using the G/G' Raman mode intensity ratio.
• Observed a direct correlation between oxygen adatom migration and reversible changes in graphene's wettability.

Conclusions:

• Electrical bias can controllably induce reversible adatom migration on graphene oxide.
• Raman spectroscopy is an effective tool for monitoring adatom dynamics on graphene surfaces.
• The reversible migration of oxygen adatoms offers a pathway to dynamically tune graphene's surface wettability.