In　this　work,　we　demonstrate　the　conversion　of　amorphous　to　crystalline　carbon　nanomaterials　through　the　synthesis　of　carbon　nanomaterials　on　silicon　substrates　coated　with　gold　films　in　CH4-N-2-H-2　environment　and　CH4-N-2-H-2　plasma　by　hot　filament　chemical　vapor　deposition,　respectively.　The　characterization　results　indicate　that　the　flow　rate　of　methane　and　plasma　lead　to　the　structural　conversion　and　the　change　of　composition　of　carbon　nanomaterials,　which　are　related　to　the　conversion　of　hydrocarbon　radicals　to　benzene　molecules　on　the　gold　nanoparticles　and　the　incorporation　of　nitrogen　in　the　carbon　nanomaterials　caused　by　the　plasma.　Furthermore,　the　isothermal　absorption　theory　was　applied　to　study　the　structural　conversion　of　amorphous　to　crystalline　carbon　nanomaterials　in　the　CH4-N-2-H-2　plasma.　The　studies　suggest　that　the　change　of　surface　tension　caused　by　the　dissolution　of　different　carbon　species　in　gold　nanoparticles　plays　a　key　role　for　the　structural　conversion　of　the　carbon　nanomaterials.　The　photoluminescence　properties　of　synthesized　carbon　nanomaterials　were　investigated　at　room　temperature.　The　results　exhibit　that　the　carbon　nanomaterials　can　generate　the　ultraviolet,　blue,　green　and　red　light　due　to　the　functional　groups　on　the　surfaces　of　carbon　nanomaterials　and　they　are　expected　to　emit　white　light　after　the　functional　groups　are　adjusted.　The　outcomes　of　this　work　are　significant　to　control　the　structures　of　carbon　nanomaterials　and　contribute　the　development　of　white　light　emission　devices.