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Si 3 N 4 nanorods have been synthesized by nitriding borosilicate glass with ammonia. The formed Si 3 N 4 nanorods exhibit significant crystallization, and are 20 to 80 nm in diameter and 10 to 100 µm in length. Some nanorods are wrapped by amorphous Si 2 N 2 O. The formation of the Si 3 N 4 nanorods is explained based on the vapor-solid growth mechanism; the borosilicate glass substrate and the formation of SiO vapor via a solid-diffusion reaction between boron and silica are responsible for the nanorod growth.