Green synthesis of blue-green photoluminescent beta-SiC nanowires with core-shell structure using coconut shell as carbon source

This work proposes a green method for synthesizing SiC nanowires (NWs) via the chemical vapor deposition (CVD) technique using coconut shell and silicon as raw materials. Using coconut shell as carbon source decreases the synthesis temperature of SiC. A large number of core-shell SiC NWs were obtained after firing at 1200 degrees C, a thin SiO2 layer is distributed on the outer shell of SiC NWs. The synthesized SiC NWs grow along the [111] direction, up to dozens of micrometers in length and diameters of 10-75 nm. However, the chain-bead structure of SiC NWs is formed after firing at 1400 degrees C due to the SiO2 bead embedded in SiC NWs. The synthesized core -shell SiC NWs fired at 1200 degrees C emit strong violet-blue light, which has good application prospects in opto-electronic devices.