The　CuO　nanorods　were　in-situ　grown　on　sensing　electrodes　by　a　chemical　bath　method　for　the　detection　of　volatile　organic　compounds　(VOCs).　The　synthesized　material　was　characterized　by　using　X-ray　diffraction　(XRD),　scanning　electron　microscopy　(SEM),　transmission　electron　microscopy　(TEM),　X-ray　photoelectron　spectroscopy　(XPS),　and　Fourier-transform　infrared　spectroscopy　(FTIR).　The　CuO　nanorods,　with　lengths　of　100–150　nm　and　diameters　of　35–55　nm,　were　uniformly　formed　into　a　thin　film　on　the　electrode　surface,　with　a　thickness　of　approximately　1　μm.　The　gas　test　results　demonstrated　that　the　sensor　achieved　a　peak　response　of　1.32　for　formaldehyde　at　200　°C,　and　a　response　of　1.92　for　ethanol　at　175　°C.　At　a　concentration　of　50　ppm,　ethanol　and　formaldehyde　at　an　operating　temperature　of　200　°C　exhibit　short　response/recovery　times　of　28　s/48　s　for　ethanol　and　45　s/62　s　for　methanol,　respectively,　coupled　with　good　reproducibility.　Moreover,　the　sensor　exhibited　a　power-law　response　to　varying　gas　concentrations　and　showcased　superior　selectivity　in　the　VOCs　gas　detection.　This　in-situ　growing　CuO　of　our　work　provides　a　facial　gas　sensing　material　fabricated　method.　©　2024