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Boosting photothermal conversion through array aggregation of metalloporphyrins in bismuth-based coordination

Liang He1, Jing He1, Er-Xia Chen1,2

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New metal-organic frameworks (MOFs) efficiently convert near-infrared light into heat. These materials demonstrate high photothermal conversion efficiency for applications like solar-driven water evaporation.

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Area of Science:

  • Materials Science
  • Chemistry
  • Nanotechnology

Background:

  • Efficient near-infrared (NIR) light to heat conversion is crucial for biotechnological applications.
  • Porphyrin-based metal-organic frameworks (MOFs) are promising photothermal materials.

Purpose of the Study:

  • Synthesize novel 3D porphyrin-based MOFs for enhanced NIR light absorption and photothermal conversion.
  • Investigate the structure-property relationships governing NIR absorption and photothermal efficiency.

Main Methods:

  • Synthesis of two new 3D MOFs (CoTCPP-Bi and NiTCPP-Bi) with a sra-net topology.
  • Characterization of MOF structures, including X-ray diffraction and spectroscopic analysis.
  • Evaluation of photothermal conversion efficiency under NIR laser irradiation and solar-driven water evaporation tests.

Main Results:

  • CoTCPP-Bi MOF exhibits strong NIR absorption up to 1400 nm due to close metalloporphyrin spacing and van der Waals forces.
  • The material achieves rapid temperature elevation to 190 °C within 30 seconds under 0.7 W cm⁻² of 808 nm laser irradiation.
  • Demonstrated high solar-driven water evaporation efficiency of 98.5% with a rate of 1.43 kg m⁻² h⁻¹ under 1 sun.

Conclusions:

  • The strategic design of MOFs, incorporating aggregation effects and metalloradical chemistry, enhances NIR light absorption and photothermal performance.
  • CoTCPP-Bi is a highly efficient photothermal material with potential applications in solar energy and biotechnology.
  • The study provides a framework for developing advanced photothermal materials through rational MOF design.