Thermite, a composite of metal and metal oxide, finds wide applications in power and thermal generation systems that require high-energy density. Most of the researches on thermites have focused on using aluminumAl particles as the fuel. However, Al particles are sensitive to electrostatic discharge, friction, and mechanical impact, imposing a challenge for the safe handling and storage of Al-based thermites. Silicon Si is another attractive fuel for thermites because of its high-energy content, thin native oxide layer, and facile surface functionality. Several studies showed that the combustion properties of Si-based thermites are comparable to those of Al-based thermites. However, little is known about the ignition properties of Si-based thermites. In this work, we determined the reaction onset temperatures of mechanically mixed MM SiFe2O3 nanothermites and SiFe2O3coreshell CS nanothermites using differential scanning calorimetry. The SiFe2O3 CS nanothermites were prepared by an electroless deposition method. We found that the SiFe2O3 CS nanoparticles NPs had a lower reaction onset temperature550 C than the MM SiFe2O3 nanothermites 650 C. The onset temperature of the SiFe2O3 CS nanothermites is also insensitive to the size of the Si core NP. These results indicate that the interfacial contact quality between Si and Fe2O3 is the dominant factor for determining the ignition properties of thermites. Finally, the reaction onset temperature of the SiFe2O3 CSNPs is comparable to that of the commonly used Al-based nanothermites, suggesting that Si is an attractive fuel for thermites.