Successful synthesis of a novel triphenylamine based salicylaldehyde fluorophore (compound 1) was performed via Suzuki cross-coupling reaction. Subsequently, the identification the hydrazine vapor of an electrospun nanofiber sheet combined with compound 1 depending on solid condition was described. Furthermore, cellulose acetate (CA) combined with the electrospun nanofiber sheet based on compound 1was formed by applying the electrospinning technique where the average diameter was 324.6 ± 91.6 nm. The sensing nanofiber sheet exhibited a sensitive and selective reaction to hydrazine vapor with a linear concentration range of 0.2-1 %w/v in aqueous solution according to the analysis of fluorescence images using ImageJ. Moreover, it exhibited the elevated selectivity with hydrazine across 21 convenient interferences. Initial findings revealed the nanofibrous mat’s sensitivity and selectivity in terms of the identification of hydrazine via naked-eye detection under backlight 365 nm with fluorescent turn-off mode. Additionally, the generation of compound 1 and the hydrazone product (compound 1-HZ) was investigated through the use of 1H-NMR titration and HRMS, which affirmed the formation of hydrazine with a proton chemical shift at 7.95 ppm, HRMS of compound 1-HZ at m/z = 380.1764 [1-HZ+H]+). It has been demonstrated that the nanofibrous mat offers a basic and suitable method for detecting water vapour in water environments as well as industrial chemical setting.