Infrared absorption property of silicon carbide-silica nanocables synthesized by ethanol pyrolysis

TL;DR

This study presents a controllable method for synthesizing SiC-SiO₂ nanocables via ethanol pyrolysis, analyzing their infrared absorption properties and how synthesis parameters affect surface structure and phonon resonance.

Contribution

It introduces a synthesis technique allowing control over nanocable dimensions and surface properties, and links these to infrared absorption features.

Findings

Enhanced FTIR peak at 1137cm$^{-1}$ with increased flow ratio.

Surface phonon resonance observed at 910cm$^{-1}$ in FTIR spectra.

Surface structure disorder increases with flow ratio.

Abstract

A controllable synthesis method for SiC-SiO$_{2}$ nanocables has been proposed. The diameter of SiC core and thickness of SiO$_{2}$ shell were changed by adjusting the flow ratio between Ar dilution gas and ethanol precursor. With increasing the flow, the enhancement of 1137cm$^{-1}$ peak was observed from fourier transform infrared spectroscopy (FTIR) spectra. This peak is considered to be originated from a highly disordered surface structure of SiO$_{2}$ shell which was enhanced with increasing the flow. The FTIR spectra show the 910cm$^{-1}$ peak which is attributed to surface phonon resonance in the nanostructure of SiC exited by p-polarized field component.