▎ 摘　　要

NOVELTY - Preparing integrated polysaccharide/three dimensional nitrogen-doped graphene-carbon nanotube composite material, comprises e.g. (i) dispersing graphene oxide in water to obtain graphene oxide suspension, ultrasonicating with carbon nanotube and graphene oxide suspension, mixing with pyrrole monomer to obtain homogeneous graphene oxide suspension, freezing and calcining to obtain three dimensional nitrogen-doped graphene-carbon nanotube, (ii) dispersing sodium alginate in deionized water to obtain sodium alginate solution, mixing with N-hydroxysuccinimide, ethylene dichloride and chitosan powder to obtain chitosan solution, and freezing to obtain integrated polysaccharide sodium alginate-chitosan composite material, and (iii) mixing integrated polysaccharide sodium alginate-chitosan composite material with deionized water to obtain saturated uniform solution, ultrasonicating with three dimensional nitrogen-doped graphene-carbon nanotube to saturated uniform solution, and centrifuging. USE - The composite material is useful in electrochemical sensor (claimed), and in super capacitor, electrochemical sensor, lithium ion battery and nano-material fields. ADVANTAGE - The composite material has excellent electron transport performance. DETAILED DESCRIPTION - Preparing integrated polysaccharide/three dimensional nitrogen-doped graphene-carbon nanotube composite material, comprises (i) dispersing 10-15 mg graphene oxide in 20-25 ml water to obtain graphene oxide suspension, then adding 3-4 mg carbon nanotube to the graphene oxide suspension, ultrasonic processing for 1-1.5 hours, adding 1-1.2 ml pyrrole monomer, ultrasonic mixing to obtain homogeneous graphene oxide suspension, adding 2-3 mg pyrrole monomer to the homogeneous graphene oxide suspension, ultrasonic mixing at 180-185 degrees C for 12-13 hours, naturally cooling to room temperature to obtain gel, freezing and drying, and calcining at 800-805 degrees C for 3.5-4 hours under argon atmosphere to obtain three dimensional nitrogen-doped graphene-carbon nanotube, (ii) dispersing sodium alginate in 50-53 ml deionized water to obtain sodium alginate solution having concentration of 2 mg/ml, vigorously stirring sodium alginate solution, stirring and adding 50-55 mg N-hydroxysuccinimide and 50-55 mg ethylene dichloride to the sodium alginate solution to obtain activated sodium alginate solution, adding chitosan powder into 50-53 ml 0.1M concentration of acetic acid solution and vigorously stirring, completely dissolving the chitosan to obtain chitosan solution with volume concentration of 2 mg/ml, dropping the chitosan solution into activated sodium alginate solution, keeping at room temperature for 8-8.5 hours, centrifuging, thoroughly washing many times with ultrapure water and acetic acid solution, freezing and drying to obtain integrated polysaccharide sodium alginate-chitosan composite material, and (iii) mixing integrated polysaccharide sodium alginate-chitosan composite material with deionized water to obtain saturated uniform solution, then adding three dimensional nitrogen-doped graphene-carbon nanotube to saturated uniform solution, ultrasonicating for 1-1.5 hours, centrifuging and washing to obtain final product. An INDEPENDENT CLAIM is also included for use of integrated polysaccharide/three dimensional nitrogen-doped graphene-carbon nanotube composite material in electrochemical sensor.