Size-controlled　and　high-purity　3C-SiC　nanoflakes　(NFs)　are　synthesized　on　the　tips　of　vertically　aligned　carbon　nanotube　(VA-CNT)　carpets　with　a　hot-filament　chemical　vapor　deposition　(HF-CVD)　method.　The　average　diameter　and　height　of　SiC　NFs　can　be　tuned　by　changing　the　thickness　of　per-deposited　Si　and　growth　conditions.　The　growth　process　of　the　SiC　NFs　is　suggested　to　be　dominated　by　a　vapor-solid　(VS)　mechanism.　The　prepared　SiC　NFs　exhibit　quantum-confinement　effects,　emitting　strong　violet-blue　photoluminescence　(PL)　under　ultraviolet　excitation.　The　PL　peak　position　changes　from　410　to　416　nm　as　the　excitation　line　increases　from　290　to　400　nm.　This　result　opens　the　possibility　for　the　application　of　the　luminescent　solid-state　freestanding　3C-SiC　NFs　in　photonics　as　well　as　photonics/electronics　integration.