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Pressure sensor via optical detection based on a 1D spin transition coordination polymer.

Cătălin M Jureschi1, Jorge Linares2, Aurelian Rotaru3

  • 1Department of Electrical Engineering and Computer Science and Advanced Materials and Nanotechnology Laboratory (AMNOL), "Stefan cel Mare" University, University Street 13, Suceava 720229, Romania. catalin.jureschi@eed.usv.ro.

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Summary

This study shows a coordination polymer can act as a pressure sensor, changing color under high pressure. This spin crossover material offers a new method for optical pressure detection up to 250 MPa.

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Area of Science:

  • Materials Science
  • Solid-State Chemistry
  • Chemical Sensing

Background:

  • Spin crossover (SCO) materials exhibit changes in electronic spin states in response to external stimuli.
  • Coordination polymers offer tunable properties for advanced material applications.
  • Optical detection methods are desirable for non-invasive sensing applications.

Purpose of the Study:

  • To evaluate the potential of a specific 1D spin crossover coordination polymer, [Fe(4-(2'-hydroxyethyl)-1,2,4-triazole)3]I2∙H2O, as a pressure sensor.
  • To investigate the pressure-induced spin state switching and associated optical changes.
  • To develop a theoretical model for understanding the pressure-temperature phase diagram.

Main Methods:

  • Optical detection of color changes under applied contact pressures up to 250 MPa.
  • Calorimetric and Mössbauer measurements to analyze spin state transitions.
  • Theoretical analysis using an Ising-like model to determine the pressure-temperature phase diagram.

Main Results:

  • A dramatic and persistent color change was observed in the coordination polymer under pressure.
  • Experimental data supported theoretical predictions of spin state switching.
  • The calculated pressure-temperature phase diagram revealed a bistability region.

Conclusions:

  • The 1D spin crossover coordination polymer [Fe(4-(2'-hydroxyethyl)-1,2,4-triazole)3]I2∙H2O is suitable for optical pressure sensing.
  • The observed color change provides a visual indicator of pressure.
  • The study establishes a framework for understanding SCO materials in pressure sensing applications.