Preparation of cotton fabric based non-invasive colorimetric sensor for instant detection of ketones

Cotton based colorimetric sensing offers great potential for the detection of desired analytes due to their easy naked-eye sensing, ease in fabrication, cost effectiveness, rapid recognition, high sensitivity and selectivity. Poly (2-(dimethylamino ethyl) methacrylate) (pDMAEMA) and sodium nitroprusside (SNP) were deposited alternatively on a treated cotton fabric for non invasive calorimetric sensing of ketones. Physical and chemical characterizations such as FESEM, EDS, XRD, UV–vis, FTIR and XPS of the treated cotton based sensor were carried out. Standard colour chart of the targeted ketones is prepared by dissolving appropriate amount of them with distilled water to get down to the final concentration as 80 mM and 10 µL of each solution of analyte was dropped on the surface of treated cotton fabric. The fabricated sensor is also tested for its practicability by analyzing the targeted ketones in human urine and the results obtained were compared with the standard colour chart. The results shows consistency in colours thereby making it a quick, efficient, eco-friendly and reliable monitoring tool to detect various ketones.