Equipment-free chromatic determination of formaldehyde by utilizing pararosaniline-functionalized cellulose nanofibrous membranes

- Easy-to-perform and cost-effective electrospun nanofibrous membrane-based colorimetric strips were developed.
- The strips achieved naked eye detection limit of 0.06 mg m−3, linear range of 0.12-6 mg m−3, and fast response of 15 min.
- The colorimetric strips exhibited excellent reversibility, satisfactory specificity, and fast response to formaldehyde.