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Chemical bonding theories were pioneered by American chemist Gilbert N. Lewis. He developed a model called the Lewis model to explain the type and formation of different bonds. Chemical bonding is central to chemistry; it explains how atoms or ions bond together to form molecules. It explains why some bonds are strong and others are weak, or why one carbon bonds with two oxygens and not three; why water is H2O and not H4O. 
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Thiol Coordination Softens Liquid Metal Particles To Improve On-Demand Conductivity.

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Thiol surfactants and nonpolar solvents enable tunable rupturing of eutectic gallium indium (EGaIn) particles for flexible electronics. This significantly lowers the stress required for electromechanical actuation in pressure sensors.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Surface Chemistry

Background:

  • Tunable particle mechanics are crucial for advanced flexible electronic applications like pressure sensors.
  • Eutectic gallium indium (EGaIn) particles offer unique electromechanical properties but require controlled rupturing for functionality.

Purpose of the Study:

  • To investigate the effect of thiol surfactants and solvent choice on the mechanosensitivity and rupturing behavior of EGaIn particles.
  • To optimize EGaIn particle preparation for enhanced performance in flexible electronic devices.

Main Methods:

  • Preparation of EGaIn particles in toluene with thiol surfactants (dodecanethiol, propanethiol) and comparison with ethanol-based preparations.
  • Nanoscale characterization using transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS) to analyze gallium oxide growth.
  • Atomic force microscopy (AFM) for force-indentation curves and conductive AFM (c-AFM) for electrical probing of individual particles.
  • Macroscale characterization using laser ablation and scanning electron microscopy (SEM) coupled with resistance measurements.

Main Results:

  • Thiol surfactants and toluene synergistically reduce the stress required for electromechanical actuation of EGaIn particles.
  • Thiolation suppressed gallium oxide formation, leading to intensified softening and rupturing at 40% lower forces compared to bare particles.
  • Macroscopically, thiolated EGaIn particles achieved electrical activation at 0.1 W laser power, significantly lower than bare particles (requiring 3x higher power).

Conclusions:

  • The synthesis conditions, specifically using thiol surfactants in nonpolar solvents, enable on-demand, tunable rupturing of EGaIn particles.
  • This approach significantly enhances the electromechanical response and lowers actuation thresholds, benefiting flexible electronic applications.
  • Optimized EGaIn particle preparation provides a pathway for developing highly sensitive and reliable pressure sensors.