Development of high-speed ion conductance microscopy

Area of Science:

• Biophysics
• Surface Science
• Microscopy Technology

Background:

• Scanning Ion Conductance Microscopy (SICM) offers non-contact surface imaging in ionic solutions, ideal for fragile biological specimens.
• Current SICM imaging rates are insufficient for many dynamic biological studies.

Purpose of the Study:

• To develop a high-speed Scanning Ion Conductance Microscopy (SICM) system.
• To significantly enhance the temporal resolution of SICM for biological applications.

Main Methods:

• Implemented a fast Z-scanner with active vibration control to minimize probe Z-positioning delays (<10 µs) and maintain a 6 μm stroke.
• Engineered pipette probes with enhanced ion conductance to reduce noise and increase ion current detection bandwidth up to 100 kHz.

Main Results:

• Achieved a 100-fold increase in temporal resolution compared to conventional SICM systems.
• Maintained high spatial resolution of approximately 20 nm.
• Demonstrated feasibility for high-speed imaging of biological samples.

Conclusions:

• The developed high-speed SICM system overcomes previous limitations in imaging speed.
• This advancement opens new possibilities for observing dynamic biological processes at the nanoscale.