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Cyclic Solid-State Multiple Phase Changes with Tuned Photoemission in a Gold Thiolate Coordination Polymer.

Oleksandra Veselska1,2, Shefali Vaidya1,2, Chinmoy Das3

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Summary

Researchers developed a novel gold-thiolate polymer for phase-change random access memory (PCRAM). This material offers reversible phase changes with mild heating and distinct optical properties for efficient data readout.

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Coordination PolymersGold(I)LuminescencePhase Change

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Solid-State Chemistry

Background:

  • Phase-change random access memory (PCRAM) relies on materials exhibiting reversible phase transitions.
  • Inorganic chalcogenides are efficient PCRAM materials but have drawbacks like high transition temperatures and poor domain control.
  • Brittleness of current materials limits their application and scalability.

Purpose of the Study:

  • To introduce a novel Au(I)-thiolate coordination polymer as a potential PCRAM material.
  • To investigate the phase change properties and optical characteristics of this new material.
  • To overcome the limitations of existing inorganic chalcogenide-based PCRAM.

Main Methods:

  • Synthesis of a Au(I)-thiolate coordination polymer.
  • Inducing phase changes using mild heating (<200°C).
  • Reversing phase changes via soft hand grinding.
  • Characterizing photoluminescent properties of different phases.

Main Results:

  • The Au(I)-thiolate polymer exhibits two successive phase changes: amorphous-to-crystalline1-to-crystalline2.
  • Phase transitions are reversible under mild conditions (heating and grinding).
  • Each distinct phase displays unique photoluminescent properties, enabling optical readout.

Conclusions:

  • The developed Au(I)-thiolate coordination polymer offers reversible phase changes under soft conditions.
  • Distinct photoluminescent properties of each phase facilitate efficient optical data readout.
  • This material presents a promising pathway for the development of next-generation PCRAM devices.