The dynamic growth of Cu nanoparticles at high temperatures was observed in situ by a transmission electron microscope. During growth, Cu nanorods are formed and their aspect ratio increases from 1.24 to 4.59 with growth time and temperature (T ≤ 920 °C). With further temperature increasing (at T = 960 °C), all the particles become a spherical shape. Most Cu nanorods formed during growth rotate nearly monotonically around a fixed axis, and their instantaneous rotation speed follows a Gaussian distribution. The variation of the rotation speed is 3 × 10-3 rad/s at T = 800 °C and 1.7 × 10-3 rad/s at T = 920 °C, which infers a more active rotation at lower temperature. This phenomenon is believed to be caused by the difference in Cu adatom concentrations around the Cu nanorods during growth.
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Physical and Theoretical Chemistry
- Surfaces, Coatings and Films