▎ 摘　　要

NOVELTY - Preparation of graphene electrode array involves applying nail polish on target substrate to form a uniform coating and laser engraving the nail polish coating in air using laser with specific wavelength and power. USE - Preparation of graphene electrode array used in electrochemical sensors, supercapacitors, electrocatalysis, electroheating films, and antistatic coatings for detecting heavy metal ions (all claimed). ADVANTAGE - The method economically produces graphene electrode array by a simple method using economically available raw materials and equipment. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: (1) preparation of electrochemical sensor, which involves using graphene electrode array, sodium montmorillonite solution and carboxylated carbon nanotube solution; and (2) method for detecting heavy metal ions by anodic stripping voltammetry of electrochemical sensor.