Graphene　quantum　dots　(GQDs)　as　recently　emerging　0-D　graphitic　nanomaterials,　have　attracted　much　attention　due　to　their　unique　optical,　electrical　and　catalytic　properties.　However,　some　properties　of　GQDs,　such　as　very　small　size,　low　density,　and　excellent　water-solubility,　make　it　difficult　to　be　separated　and　immobilized.　This　may　limit　the　recycle　and　purification　of　GQDs,　and　thus　their　applications　in　catalysis　and　sensing.　In　this　work,　we　prepared　tubular　GQD-nanoassemblies　(t-GQD-NAs)　by　etching　single-walled　carbon　nanotubes　(SWCNTs)　with　concentrated　HNO3.　The　synthesized　t-GQD-NAs　were　characterized　by　TEM,　SEM,　XPS,　Raman　spectroscopy　and　electrochemiluminescence　(ECL)　in　details.　t-GQD-NAs　were　much　shorter　and　slimmer　in　morphology,　bore　more　oxygen-containing　groups,　and　had　a　higher　surface　defect　density　compared　with　SWCNTs.　t-GQD-NAs　not　only　maintained　good　UV　absorption　property　of　SWCNTs　but　also　showed　strong　infrared　ECL　emission　and　broad　ECL　spectrum,　verifying　that　t-GQD-NAs　were　assembled　from　GQDs　of　various　sizes　and　some　graphene　nanoribbons.　This　is　for　the　first　time　that　0-D　GQDs　were　reported　to　be　assembled　into　1-D　tubular　carbon　structures.　The　t-GQD-NAs　with　abundant　surface　states　and　good　ECL　activity　could　be　easily　separated,　purified,　and　immobilized,　suggesting　their　promising　applications　in　ECL　sensing　and　catalysis.　©　2020　Elsevier　B.V.