Investigation of dye-doped sol–gels for ammonia gas sensing

Carbon Dots and Fluorescein: The Ideal FRET Pair for the Fabrication of a Precise and Fully Reversible Ammonia Sensor

“…Although fluorescein is well-known to increase its emission peak at higher pH values [8][9][10], such remarkable sharp response to ammonia cannot be exclusively ascribed to the fluorescein pH behavior. Indeed, as it has been observed by studying the FRET behavior in solution, a prominent increase in FRET efficiency from 85 to 88% is observed when 10 v/v % of 0.1 M NH4OH solution in water is added to the mixture.…”

Micro- and nanostructured sol-gel-based materials for optical chemical sensing (2005–2015)

“…The gas phase sensor exhibited a response time of~1 min and LOD of 13 ppb while the dissolved phase sensor exhibited a 10 min response time and detected NH 3 in water down to 5 ppb. The same silica material with high porosity (50 %) dried and annealed at 425°C was impregnated with bromocresol purple and bromocresol blue and its response to gaseous ammonia also investigated [112]. The films were not overcoated with a hydrophobic layer and therefore humidity had a significant effect on sensor response.…”

Synthesis and characterization of nano Ag/Pt and methyl violet co-doped sol–gel porous material

“…These methods develop materials that have the desired optical properties according to the added dopants. Functional, chemical and optical properties of the dye-doped sol-gel material and encapsulation of biological molecules in the sol-gel materials have been discussed extensively [11][12][13][14][15][16][17][18]. Sol-gel materials are appropriate for the independent encapsulation of methyl violet (MV), in such a way that their chemical reactivity is maintained.…”