On‐site Colorimetric Forensic Sensor (I): Quantitative Detection of Toxic H₂S and NH₃ Gases Using Metal‐Ion‐modified Silica Powders

Optical Detection of Acetone Using “Turn-Off” Fluorescent Rice Straw Based Cellulose Carbon Dots Imprinted onto Paper Dipstick for Diabetes Monitoring

“…However, these methods require expensive devices needing delicate handling, which limits their potential for the development of easily accessible bedside diagnostic applications. Both colorimetric and fluorescent gas sensors use a visual detection method where an immediate color change is seen by the eye when the chemical analyte contacts the receptor. − Sensors based on changes of colors have been used in various fields including environmental studies, analytical chemistry, forensics, and biological diagnostics. − Fluorescent sensors showing turn-on, turn-off, or turn-on-off behavior when in contact with the analyte were developed for the detection of different substances, such as ammonia gas, metal ions, and biothiols. , Fluorescent sensors are a composite of different materials such as dyes, fluorescent proteins, carbon dots (CDs), metal–organic frameworks (MOFs), and semiconductor quantum dots (QDs) . Interaction between fluorescent materials with analyte substances is either by covalent interactions or noncovalent interactions: coordination, hydrogen bonds, π–π interactions, hydrophobic- or hydrophilic-based interactions, donor/acceptor pairs, or electrostatic interactions.…”

Fabrication and characterization of cellulose acetate-based nanofibers and nanofilms for H2S gas sensing application

“…Environmental pollution has become a significant issue worldwide due to the growing industrial waste emission to the community (Lu et al, 2017). Toxic gases such as hydrogen Sulfide (H2S), carbon monoxide (CO) and ammonia (NH3) are recognized as environmentally dangerous gaseous pollutants (Kaur et al, 2008;Marszałek, Kowalski & Makara, 2018;Ryu, Arifin, Ha & Lee, 2015).…”