Disclosed is a method for preparing a collagen/carboxylated carbon nanotube/polyacrylamide composite gel, the method comprising the steps of : extracting collagen and formulating a collagen aqueous solution; preparing a carboxylated carbon nanotube solution; preparing a cross-linking agent solution; and mixing the collagen aqueous solution, the carboxylated carbon nanotube solution and the cross-linking agent solution uniformly, subjecting the mixture to an ultrasound at room temperature, performing an airtight evacuation, then respectively adding a TEMED solution and an ammonium persulfate solution to cause a polymerization reaction, and obtaining a collagen/carboxylated carbon nanotube/polyacrylamide composite hydrogel. A solar cell and a method of preparing the same are also provided. The above material has stable properties and high electrical conductivity.
; 秦松
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