Texturing Silicon Nanowires for Highly Localized Optical Modulation of Cellular Dynamics

Area of Science:

• Materials Science
• Biotechnology
• Nanotechnology

Background:

• Silicon-based materials exhibit photoelectric and photothermal properties for silicon-biology interface applications.
• Silicon nanowires offer potential for localized cellular modulation due to their small size.
• Standard single crystalline silicon nanowires have limited photothermal efficacy because of poor light absorption and rapid heat dissipation.

Purpose of the Study:

• To enhance the photothermal response of silicon nanowires.
• To demonstrate high-resolution extracellular modulation of cellular calcium dynamics.
• To explore applications in probing and modulating subcellular electrical and chemical signals.

Main Methods:

• Introducing nanoscale textures on the surface and within the bulk of silicon nanowires.
• Utilizing engineered silicon nanowires for extracellular modulation experiments.
• Observing calcium dynamics in mammalian cells, including glial cells, neurons, and cancer cells.

Main Results:

• Successfully improved the photothermal response of silicon nanowires through surface and bulk texturing.
• Demonstrated high-resolution extracellular modulation of calcium dynamics in various mammalian cell types.
• Validated the potential of these textured silicon nanowires as cellular modulators.

Conclusions:

• Engineered silicon nanowires with nanoscale textures exhibit enhanced photothermal efficacy.
• These materials enable precise extracellular modulation of cellular calcium dynamics.
• The developed silicon nanowire technology holds promise for advancing electrophysiology and cellular engineering at the subcellular scale.