A novel cascaded energy conversion system inducing efficient and precise cancer therapy.

Area of Science:

• Materials Science
• Nanotechnology
• Biomedical Engineering

Background:

• Photothermal therapy (PTT) and photodynamic therapy (PDT) are light-based cancer treatments with limitations.
• PTT causes hyperthermia damage; PDT has shallow light penetration.
• Novel energy conversion strategies are needed for advanced cancer therapy.

Purpose of the Study:

• To develop a thermoelectric therapy (TET) using SrTiO3/Cu2Se nanoplates for cancer treatment.
• To investigate the light-thermal-electricity-chemical energy conversion mechanism.
• To evaluate the efficacy and safety of TET in inducing cancer cell apoptosis.

Main Methods:

• Fabrication of SrTiO3/Cu2Se p-n heterojunction nanoplates.
• Irradiation and natural cooling to induce a temperature gradient (35-45 °C).
• Analysis of self-build-in electric fields, charge separation, and radical generation (superoxide and hydroxyl radicals).

Main Results:

• Successful construction of bulk and interfacial electric fields in the heterojunction.
• Minimized charge recombination due to dual electric fields.
• Efficient generation of reactive oxygen species (ROS) leading to cancer cell apoptosis.
• No apparent damage to surrounding tissues observed.

Conclusions:

• The developed thermoelectric therapy (TET) offers a novel approach for cancer treatment.
• The strategy of constructing bulk and interfacial electric fields enhances charge separation and transfer.
• TET demonstrates potential for effective cancer cell killing with improved safety profiles.