| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Functional Nanomaterials
|
| Presentation Title |
Nanodiamond patterning of direct laser written structures by pulsed laser annealing |
| Author(s) |
Sumeer Khanna, Jagdish Narayan, Roger Narayan |
| On-Site Speaker (Planned) |
Sumeer Khanna |
| Abstract Scope |
Conventionally, nanodiamond (ND) growth on device structures has been achieved by depositing CVD diamond thinfilm. This is our first attempt towards direct conversion of inherent amorphous or semi-crystalline carbon phase of direct laser written (DLW) structures (50-150 um) to ND phase (10-150 nm crystallites). This transformation is achieved by two-step annealing process of carbonizing DLW structures in inert Ar atmosphere at ~500 deg C and pulsing high energy density (~0.6-0.8 J/cm2) laser shots. Raman spectroscopy shows diamond peak with FWHM < 5 cm-1 and Raman shift of 1327-1332 cm-1 exhibiting quantum confinement effect. XPS analysis presents sp3/sp2 as ~85-95% after laser annealing. EBSD Kikuchi patterns display highly crystalline ND phase. HR-SEM and STEM (DF/BF) imaging reveals formation of ND crystallites and onion-like-carbon (OLC) graphite (0002). Fast Fourier Transform (FFT) diffraction pattern describes pseudo hexagonal and linear symmetry demonstrating ND and graphitic (0002) phases respectively. ND epitaxy on sapphire (0001) is established. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Nanotechnology, Electronic Materials, Thin Films and Interfaces |