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Soft lithographic patterning of spin crossover nanoparticles.

Christophe Thibault1, Gábor Molnár, Lionel Salmon

  • 1CNRS, LAAS, 7 Avenue du Colonel Roche, F-31077 Toulouse, France.

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Summary

Microtransfer molding successfully created large-area spin crossover nanoparticle patterns using an aprotic solvent. These organized micropatterns exhibit the spin crossover phenomenon, confirmed by various imaging and spectroscopic techniques.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Chemistry

Background:

  • Spin crossover nanoparticles exhibit tunable magnetic and optical properties.
  • Fabricating ordered nanoparticle arrays is crucial for advanced device applications.
  • Controlling nanoparticle organization over large areas presents a significant challenge.

Purpose of the Study:

  • To develop a method for large-area fabrication of spin crossover nanoparticle patterns.
  • To investigate the use of microtransfer molding with specific solvents for pattern generation.
  • To confirm the spin crossover behavior in the fabricated patterns.

Main Methods:

  • Microtransfer molding technique was employed for pattern fabrication.
  • An aprotic solvent, n-octane, was utilized in the process.
  • Characterization involved dark field optical microscopy, atomic force microscopy (AFM), and Raman microspectrometry.

Main Results:

  • Homogeneous micropatterns and nanopatterns of [Fe(NH(2)trz)](tos)(2) spin crossover nanoparticles were successfully fabricated over large areas.
  • The use of n-octane as an aprotic solvent facilitated the formation of well-organized patterns.
  • The spin crossover phenomenon was confirmed in the patterned nanoparticles.

Conclusions:

  • Microtransfer molding is an effective technique for large-area patterning of spin crossover nanoparticles.
  • Aprotic solvents like n-octane are suitable for achieving high-quality, organized nanoparticle patterns.
  • The fabricated patterns retain their spin crossover properties, paving the way for potential applications.