NOVELTY - Preparation of nickel carbide nanoparticles involves?adding hexahydrated nickel chloride, dissolving in water, adding acetylacetone to obtained reaction solution, adding triethylamine, placing green precipitate in reaction solution, filtering, preparing mixed solution of ethanol and water, adding obtained green solid to mixed solution, cooling, precipitating green needle-like crystals, filtering and drying in vacuum, washing with deionized water, heating to mixed solution, cooling, adding polyethylene glycol to monocarboxylic acid, centrifuging and dispersing in water.    USE - Preparation of nickel carbide nanoparticles used for photothermic therapy for treating cancers (all claimed).    ADVANTAGE - The nickel carbide nanoparticles are economically prepared with small side effect and cancer cell killing effect, without polluting the environment, by a simple method.    DETAILED DESCRIPTION - Preparation of nickel carbide nanoparticles involves?adding 1.98 g hexahydrated nickel chloride, dissolving in 10 mL water, adding 4 mL acetylacetone to the obtained reaction solution, providing under magnetic stirrer, stoppiung stirring for 15 minutes, adding 3 mL triethylamine, placing green precipitate in the reaction solution, filtering, preparing a mixed solution of 20 mL ethanol and water, adding obtained green solid to the mixed solution, stirring at 90 degrees C until completely dissolved, cooling at room temperature, precipitating green needle-like crystals, obtaining solution, filtering and drying in vacuum, washing with deionized water, obtaining nickel acetate green needle crystals, adding 0.1 g nickel acetylacetonate into 100 mL three-necked flask, adding 8 mL oleylamine and 20 mL octadecene, placing in the air condenser, heating mixture at 40 degrees C, obtaining blue transparent solution, continuing heating at 120 degrees C, inserting the upper end of air condenser in nitrogen-filled balloons, extracting solution, oxygen and water vapor into the three-necked flask, inserting protective role in the upper condenser, heating to the mixed solution at 285 degrees C at rate of 5 degrees C/minute, maintaining the temperature for 30 minutes, stopping heating, cooling to room temperature, centrifuging 10 mL ethanol for 5 minutes, dispersing product in 20 mL chloroform, adding 10 mL chloroform solution, adding polyethylene glycol to the 30 mg monocarboxylic acid, stirring reaction at room temperature for night, adding 5 mL ethanol, centrifuging and dispersing in water.