▎ 摘　　要

NOVELTY - A graphene/gold dope silver nanoparticle modified electrode preparing method involves taking a droplet of graphene oxide suspension as a modification solution, applying it on the surface of cleaned electrode, and naturally drying the electrode, placing the electrode is placed in monopotassium phosphate solution, and reducing the graphene oxide on the surface of the electrode by a constant potential reduction of -0.8 V for 600 seconds to obtain a graphene-modified electrode. The graphene modified electrode is placed in a 5 mmol/L tetrachloroauric acid solution, and a potential of -0.2 V is applied for 60 seconds to obtain a graphene/nanogold modified electrode, silver nitrate solution, 485 mu L of 0.1 mol/L diethanolamine-nitric acid buffer solution and 10 mu L of 1 mmol/L ascorbic acid are mixed uniformly, and the graphene/nanogold is quickly modified, the electrode is immersed in the mixed solution and protected from light for 5 minutes at 37 degrees C to obtain the finished product. USE - Method for preparing graphene/gold dope silver nanoparticle modified electrode for detecting iodide ions (claimed). ADVANTAGE - The method enables preparing graphene/gold dope silver nanoparticle modified electrode with strong specificity, high sensitivity and in simple manner. DETAILED DESCRIPTION - A graphene/gold dope silver nanoparticle modified electrode preparing method involves taking a droplet of 1 mg/mL graphene oxide suspension as a modification solution, applying it on the surface of cleaned electrode, and naturally drying the electrode, where the electrode is glassy carbon electrode, and the amount of the modifying solution is 0.71 mu L/mm2, which is equivalent to 5 mu L of the modified solution of the electrode having a diameter of 3 mm, placing the electrode is placed in 0.1 mol/L monopotassium phosphate solution, and reducing the graphene oxide on the surface of the electrode by a constant potential reduction of -0.8 V for 600 seconds to obtain a graphene-modified electrode. The graphene modified electrode is placed in a 5 mmol/L tetrachloroauric acid solution, and a potential of -0.2 V is applied for 60 seconds to obtain a graphene/nanogold modified electrode, 5 mu L of 0.05 mol/L silver nitrate solution, 485 mu L of 0.1 mol/L and pH 9.8 diethanolamine-nitric acid buffer solution and 10 mu L of 1 mmol/L ascorbic acid are mixed uniformly, and the graphene/nanogold is quickly modified, the electrode is immersed in the mixed solution and protected from light for 5 minutes at 37 degrees C to obtain the finished product.