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Near-Infrared Photothermal Metal-Organic Framework for Ultralow-Power-Density Laser Ablation and Direct Patterning.

Ning-Ning Zhang1, Xuan Li1, Lin-Xu Liu1

  • 1School of Chemistry and Chemical Engineering, Liaocheng University, Liaocheng 252059, China.

Inorganic Chemistry
|December 11, 2025
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Summary

A novel near-infrared (NIR) photothermal metal-organic framework (MOF) enables efficient laser ablation at low power densities. This advancement facilitates precise micro- and nano-fabrication for scalable applications.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Photochemistry

Background:

  • Direct laser writing (DLW) relies on laser ablation for micro/nanofabrication.
  • Advancement requires laser-responsive materials for efficient ablation under mild conditions.
  • Existing metal-organic frameworks (MOFs) need high laser power densities (>10⁴ W/cm²), limiting scalability.

Purpose of the Study:

  • To develop a novel near-infrared (NIR) photothermal MOF for efficient laser ablation.
  • To investigate the photothermal conversion efficiency (PCE) and ablation characteristics of the new MOF.
  • To demonstrate the utility of the MOF in direct laser writing applications.

Main Methods:

  • Synthesis and characterization of a novel NIR photothermal MOF: {[La₂ (HL)₂ (L)₂ (H₂O)₆]·xDMF}n (1).
  • Measurement of optical absorption spectrum and NIR photothermal conversion efficiency (PCE) under 808 nm laser irradiation.
  • Determination of the laser ablation threshold power density and analysis of ablation products (amorphous lanthanum oxide and graphene oxide).
  • Demonstration of direct laser writing (DLW) for precise patterning.

Main Results:

  • Compound 1 exhibits broad optical absorption and a high NIR PCE of 86.47%.
  • Laser ablation of compound 1 occurs at a significantly low power density of 9.87 W/cm².
  • Ablation in air converts compound 1 to amorphous lanthanum oxide and graphene oxide (GO).
  • Successful precise patterning of English and Chinese characters via DLW was achieved.

Conclusions:

  • The developed NIR photothermal MOF enables efficient laser ablation at significantly reduced power densities.
  • This material offers a promising platform for scalable and energy-efficient micro/nanofabrication using direct laser writing.
  • The conversion to lanthanum oxide and graphene oxide opens possibilities for composite material fabrication.