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After forming the double layer of SnO2 and Au, the compound of Sn and O with multiple band gaps was formed in a short time period via flame chemical vapor deposition (FCVD). The Sn component of SnO2 has fluidity and is the only one moving to the discrete Au side and leaving O behind. The capillarity of Sn allows it to form a unique structure with Au-Sn-O nanoparticles and amorphous Sn-O nanotubes of multiple compositions in a single process. For verification, the gradual morphological, crystallographic, compositional, and optical changes in the material were sequentially presented as per the degree of FCVD.