Obvious temperature difference along a pb cluster-decorated carbon nanowire

Area of Science:

• Materials Science
• Nanotechnology
• Surface Science

Background:

• Understanding nanoparticle behavior on nanostructures is crucial for advanced material applications.
• Carbon nanowires (CNWs) offer unique thermal and electrical properties for supporting nanomaterials.

Purpose of the Study:

• To investigate the thermal stability of lead (Pb) nanoclusters deposited on suspended carbon nanowires (CNWs).
• To explore the influence of CNWs on the melting and evaporation dynamics of Pb nanoparticles.

Main Methods:

• In situ temperature-variable transmission electron microscopy (TEM) was employed for real-time observation.
• Pb nanoclusters were deposited on suspended CNWs, with observations conducted up to 450 °C.
• Computational analysis was used to attribute observed phenomena to specific physical mechanisms.

Main Results:

• Melting and evaporation of Pb nanoparticles were significantly retarded on CNWs compared to a standard support frame.
• A notable temperature gradient of up to 10 K was observed along the sub-micrometer CNW.
• Calculations indicated that irradiating dissipation, dependent on the Pb particle's surface area, explains the observed thermal behavior.

Conclusions:

• Suspended carbon nanowires can enhance the thermal stability of deposited nanoclusters.
• The unique thermal properties of CNWs, influenced by surface area and dissipation, impact nanoparticle phase transitions.
• Findings provide insights into designing nanostructure-supported systems with tailored thermal properties.