▎ 摘　　要

NOVELTY - The sensor has a nucleus-shell quantum dot that is made of metal compound-multilayer graphene. The metal compound is selected from zinc oxide (ZnO), cadmium sulfide (CdS), and a cadmic tellide (Te). A thickness of the multi-layer graphene in the quantum dot is provided to be 2-10 nanometers. An average particle size of the metal compound ranges from 10-20 nanometers, whereas the sensor is made of sulfur dioxide, nitrogen monoxide, nitrogen dioxide, carbon monoxide and carbon dioxide. A gas sensing layer is arranged for coating the quantum dots prepared on an electrode. USE - Gas sensor for detecting toxic gas, explosive gas, and environmentally harmful gas in various industries, health care field, national defense field, terrorism field, and environment field. ADVANTAGE - The gas sensor detects trace amount of gas with high sensitivity, high selectivity, and high speed through synthesis of quantum dot nanostructures having high specific surface area. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method for manufacturing gas sensor. DESCRIPTION OF DRAWING(S) - The drawing shows a photographic view of the arrangement for detecting toxic gas.