SAIP2023

Synthesis and modification of Boron Nitride nanotubes using ion implantation

6 Jul 2023, 11:40

20m

University of Zululand

Oral Presentation Track A - Physics of Condensed Matter and Materials Physics of Condensed Matter and Materials Track 1

Speaker

Lehlohonolo Lisema (School of Physics, University of Witwatersrand, Johannesburg 2050, South Africa)

Description

In this work, Chemical Vapour Deposition (CVD) has been used to synthesize boron nitride (BN) nanostructures, particularly nanotubes, and defects selectively introduced into the synthesized BN nanostructures through ion implantation. Scanning electron microscopy (SEM) images show clear evidence of BN nanostructures and BN nanotubes (BNNTs), with the latter appearing as long, thin structures with diameters ranging from ⁓30-90 nm. Raman analysis show an E_2g mode of vibration assigned to hexagonal BN (hBN) at 1366 cm^-1 after ion implantation, with increased intensity. Grazing incidence X-ray diffraction (GIXRD) spectra revealed a prominent peak, a (004) hBN characteristic peak, present in the 54°-56° angle region, which was used to determine the average lattice parameters (a⁓2.23 and c⁓3.64 Å), crystallite size ⁓5.60nm and density (⁓1.75g/cm3) of BN nanostructures. The most notable observation in this study was a significant rise in the size of the crystallite domains in the nanostructures synthesized at 1100 and 1200 °C after ion implantation with boron ions at fluence 5x10^14 ions/cm^2.

Level for award;(Hons, MSc, PhD, N/A)?

PhD