Ag@SiO2 nanoparticles performing as a nanoprobe for selective analysis of 2-aminoanthracene in wastewater samples via metal-enhanced fluorescence

Recent progress in sensing application of metal nanoarchitecture-enhanced fluorescence

“…So far, LSP has been used to enhance emission of dyes 17,19,21,22 , rare earth, [23][24][25][26][27][28] quantum dots (QDs), 14,[29][30][31][32][33][34][35][36][37][38][39][40][41][42][43] carbon dots, 36,38 carbon nanotubes, 44 gold nanoclusters 45,46 and even upconversion fluorophores. 33,47,48 And these enhanced fluorescence has already been extensively applicated in environmental analysis, 45,[48][49][50][51][52][53][54][55][56][57][58][59][60][61][62]…”

“…10,135 The spacer layer is usually a dielectric layer with precisely/atomically controlled thickness, and used to separate and connect metal core/film and fluorophore layer. 26,50,56,58,74,136 Both the detect-free quality and the dielectric properties of the spacer can affect the plasmonic enhancement. 137 In addition, an ideal spacer layer should play ARTICLE Please do not adjust margins Please do not adjust margins Table 2 MEF-based sensors for heavy metal ions.…”

Metal Nanoparticles‐Enhanced Biosensors: Synthesis, Design and Applications in Fluorescence Enhancement and Surface‐enhanced Raman Scattering

“…While the analyte could be different from the fluorophore used in the MEF biosensor, some fluorescent analytes can act as the sensing probe for the 'turn-on' MEF biosensors. For example, Tian et al [108] have developed the Ag@SiO 2 nanoparticles to quantify fluorescent 2-aminoanthracene molecule which design principle is shown in Figure 8b. As the maximum absorbance of the other interfering molecules (i. e., aromatic amines, some dyes such as methylene blue and Crystal violet) does not overlap with the LSPR peak of the developed Ag@SiO 2 , MEF can occur only in the presence of 2-aminoanthracene with a detection limit of 1 nM.…”

“… a) DNA‐functionalized gold nanobipyramids (AuNBPs) for the detection of ATP. Interaction between the DNA and ATP results in adjustment of distance between the AuBP and Cy‐7 for fluorescence enhancement, b) Ag@Silica nanoparticles (Ag@SiO 2 ) for metal‐enhanced fluorescence detection of 2‐aminoanthracene, c) dsDNA‐functionalized Ag@SiO 2 probes for MEF detection of ATP through a competition assay design. As the ATP molecule interacts with the aptamer leaving the original dsDNA structure, the PicoGreen (PG) dye cannot bind to the cDNA−Ag@SiO 2 , leading to weaker fluorescence, d) Schematic illustration of (A) the synthesis of Au nanocube@Silica@dye MEF biosensor.…”

“…While the analyte could be different from the fluorophore used in the MEF biosensor, some fluorescent analytes can act as the sensing probe for the ‘turn‐on’ MEF biosensors. For example, Tian et al . have developed the Ag@SiO 2 nanoparticles to quantify fluorescent 2‐aminoanthracene molecule which design principle is shown in Figure b.…”