Probing pH difference between micellar solution and nanoscale water within common black film by fluorescent dye

Nanometer-Thick Newton Black Film for Selective Formaldehyde Gas Detection

“…These methods suggest good potential for soap film based assay, benefiting from the large surface area to volume ratio of the film. Inspired by these studies, we recently developed assays using fluorescent pH probe in common black films (CBF) for the detection of ppm level ammonia and ppb level acetic acid. , In this paper, we report how Newton black films can be used to sense gaseous formaldehyde based on the Hantzsch reaction. The detection principle is shown in Figure .…”