Specific　heat　and　thermal　conductivity　are　important　thermal　properties　of　high-temperature　heat　transfer　fluids　and　thermal　storage　materials　for　supercritical　solar　power　plants.　In　the　present　work,　nanofluids　composed　of　ternary　carbonate　Li2CO3-K2CO3-Na2CO3　(4:4:2,　mass　ratio)　and　1.0　wt.%　carbon　nanotubes　(CNT)　were　prepared　to　obtain　high-temperature　heat　transfer　and　storage　media　with　enhanced　specific　heat　and　thermal　conductivity.　The　dispersion　of　CNTs　in　the　nanofluids　was　tuned　by　changing　the　evaporation　temperature　(100,　140,　180　and　220　degrees　C)　and　adding　surfactants　such　as　sodium　dodecyl　benzene　sulfonate　(SDBS),　sodium　dodecyl　sulfate　(SDS),　or　gum　Arabic　(GA).　The　results　showed　that　GA　and　SDS　facilitate　good　dispersion　of　CNT　in　nanofluids　at　the　evaporation　temperatures　of　140　degrees　C　and　180　degrees　C,　resulting　in　the　formation　of　more　needle-like　nanostructures.　The　higher　increase　in　the　specific　heat　and　thermal　conductivity　of　the　nanofluids　with　SDS　at　500　degrees　C　was　78.3%　and　149.2%,　respectively.　Additionally,　the　specific　heat　of　as-prepared　ternary　carbonate　nanofluids　exhibits　a　good　thermal　stability　after　30　cycles　of　thermal　shock　experiments.