Development of a dual-mode upconversion nanoparticles-3-aminophenol nanosystem based on Inner Filter Effect for sensitive detection of nitrite and its application on test strips

Upconversion Nanoparticles Based Sensing: From Design to Point‐of‐Care Testing

“…The preparation of paper-based UCNPs sensors involves the selection of various substrates, including options such as Whatman filter paper, chromatography paper, blotting paper, glossy paper, litmus paper, pure cellulose paper, etc., depending on the specific feature requirements. [189] A wide array of methods exists for coupling UCNPs sensors to paperbased substrates, including techniques such as filtration, [147] printing, [190] doping, [191] drop-addition, [192] immersion, [193] etc. Paper-based UCNPs sensors can serve as a feasible alternative to microfluidic chips.…”

Development of a Dual Mode UCNPs-MB Biosensor in Combination with PCR for Sensitive Detection of Salmonella

“…The above characteristics make UCNPs suitable for various applications, including pesticide residue detection [ 24 ], microbial monitoring [ 25 ], and heavy metal detection [ 26 ]. Furthermore, the detection mechanisms of these strategies are primarily based on internal filtration effects (IFE) and fluorescence resonance energy transfer (FRET) [ 27 ]. These fluorescence detection processes are activated by the overlapping of the absorption band of the fluorescent acceptor with the emission peak from the fluorescent donor.…”

Development of an Fe2+sensing system based on the inner filter effect between upconverting nanoparticles and ferrozine

“…30 Due to its simplicity and ease of implication, several UCNP-based sensing systems utilising IFE have been published in the literature for important analytes including NO 2 − , Ag + , Sn 2+ , Cr 6+ , F − , S 2− and various different biomolecules. 31–38…”

“…30 Due to its simplicity and ease of implication, several UCNP-based sensing systems utilising IFE have been published in the literature for important analytes including NO 2 − , Ag + , Sn 2+ , Cr 6+ , F − , S 2− and various different biomolecules. [31][32][33][34][35][36][37][38] Here, we report a new upconversion system for the detection of Fe 2+ , based on IFE between two different Er 3+ -doped upconverting nanophosphors and FZ using a low-power laser as the excitation source. The system is highly selective and sensitive towards Fe 2+ over other common competing ions.…”