Phase Transformation of Si to SiC Nanostructure Mediated by ND Under Low Temperature Annealing
W.-C.CHIU1*, Ashek-I-Ahmed1, E.Perevedentseva1,2, C.-L Cheng1
1Department of Physics, National Dong-Hwa University, Hualien, Taiwan
2P.N. Lebedev Physics Institute, Russian Academy of Science, Moscow 119991, Russian Federation
* presenting author:WEI-CHENG CHIU,
Over the past two decades Nanodiamond (ND) has got an extensive worth in diverse scientific fields due to its unique physical optical properties, surface chemical reactivity etc1. The strong luminescence without photoetching, bio-active surface modifications and nontoxicity enable NDs as a key probe in bio and bio-medical applications such as drug delivery, bio-imaging/labeling2. Beyond bio-applications, it has also the equal potential in material research ranged from the growth of diamond thin film to composite materials3, 4. We report the utility of NDs to develop a composite nano-particle/material ‘ND/SiC/pSi’ by transforming silicon (Si)/ Silica (SiO2) phase to silicon carbide (SiC) under low temperature annealing (< 700oC) using NDs at core as seed carbon source material. In this study 5 nm NDs has been coated with porous silicon (pSi) using wet chemical synthesis process and then extracted as dried particle.Therefore,dried sample has been annealed at various temperature (300oC to 700oC) under high vacuum to achieve final structure (ND/SiC/pSi). Experimental characterizations were done using transmission electron microscopy (TEM), X-ray diffraction (XRD), Raman, FTIR and PL spectroscopy. FTIR and Raman spectroscopic observation revealed the surface chemical transformation. TEM and XRD analysis confirmed SiC phase transformation as well as the expected structure of composite particle. Significant photoluminescence enhancement and shift were observed that justifies the obtained results. This study can have a new sight in photonics, semiconductor and bio-medical applications.

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3. V. Ralchenko, A. Saveliev, S. Voronina, et al. “Synthesis, Properties and Applications of Ultrananocrystalline Diamond” Springer, 192, 109-124 (2005)
4. S.V. Kidalov and F.M. Shakhov, “Thermal Conductivity of Diamond Composites”, Materials, 2, 2467-2495(2009).

Keywords: Nanodiamond , annealing in low temperature, composite material