▎ 摘　　要

NOVELTY - Nanocomposite with a polymer/reduced graphene oxide/metal oxide or polymer/borophene/metal oxide structure comprises at least one conductive polymer, and at least one metal oxide and graphene or borophene structure. USE - Nanocomposite with polymer/reduced graphene oxide/metal oxide or polymer/borophene/metal oxide structure used for electrochemical sensor (claimed). Uses include but are not limited to defense, aviation, energy, electronics, textile industries, furniture, automobile and cosmetic industries. ADVANTAGE - The nanocomposite with polymer/reduced graphene oxide/metal oxide or polymer/borophene/metal oxide structure ensures portability, high conductivity, high mechanical strength, thermal stability, chemical stability, quick response (short response time), low device cost, and sensitivity at room temperature. The nanocomposite ensures easy, quick and particularly low cost synthesis procedure for the commercial applications in many sectors so as to synthesize high-quality borophene with low layers in large quantities. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: (1) preparation of nanocomposite, which involves (a) preparing the graphene oxide with Hummers Method and making the same functional with the azide groups on the surface of the same, (b) preparing a suspension by mixing the obtained graphene oxide dispersion with the metal salt solutions and making the same ultrasonic by stirring the same in distilled water, (c) preparing a suspension by mixing the borophene dispersion with the metal salt solutions and making the same ultrasonic by stirring the same in distilled water, preparing the polymer solution in ultrasonic bath preferably in oxalic acid, (d) keeping this solution for dissolution, (e) adding all metal oxides and/or metal chloride, preferably zinc nitrate hexahydrate, titanium(IV)chloride, vanadium(III)chloride, and graphene oxide or borophene respectively into the solutions preferably into sodium hydroxide solution under continuous magnetic stirring, (f) immersing the solution with graphene or borophene into the ultrasonic bath, (g) adding the mixture with graphene or borophene into the polymer solution, (h) homogenizing (ultrasonic irradiation) the final mixture by sonochemical method, and (i) drying graphene based or borophene based nanocomposites obtained by ultrasonic irradiation; and (2) electrochemical sensor, which comprises nanocomposite produced for the detection of the formaldehyde gas in a precise and fast manner. DESCRIPTION OF DRAWING(S) - The drawing shows a sectional view of electrochemical sensor. Nanocomposite thin film (2)