Cleaved thin-film probes for scanning tunneling microscopy

Area of Science:

• Materials Science
• Surface Science
• Nanotechnology

Background:

• Scanning tunneling microscopy (STM) traditionally relies on metallic wire probes.
• Developing novel probes is crucial for advancing STM capabilities and material analysis.

Purpose of the Study:

• To introduce and demonstrate an alternative probe fabrication method for STM.
• To explore the use of sharp-edged cleaved insulating substrates for STM probe tips.
• To showcase the versatility and functionalization potential of these new probes.

Main Methods:

• Fabrication of STM probes using sharp-edged cleaved insulating substrates coated with a thin conductive film.
• Utilizing metallic (Pt, Co, CoB), indium-tin oxide, and multilayer (Cu/Pt, Co/Pt) films for probe construction.
• Testing probe performance via STM imaging of Cu(001), Cu(111) surfaces, and Co clusters on Cu(111).

Main Results:

• Successful demonstration of STM imaging using probes made from various materials.
• Probes fabricated from cleaved insulating substrates showed effective functionality.
• The method allows for diverse material choices and probe functionalization.

Conclusions:

• Cleaved insulating substrates offer a viable alternative for STM probe fabrication.
• This approach broadens the range of materials and functionalization possibilities for STM probes.
• The new probes are effective for imaging various surfaces and nanostructures.