Aggregation/assembly induced emission based on silk fibroin-templated fluorescent copper nanoclusters for “turn-on” detection of S2−

Copper nanoclusters: designed synthesis, structural diversity, and multiplatform applications

“…Starting from 2012, 82 a great deal of research has been conducted to develop various CuNCs for applications in sulphide ion sensing. 113,117,268,269 For instance, Po-Cheng Chen et al 35 have developed a paper-based device using CuNCs aggregates and were able to detect hydrogen sulphide at 650 nM concentration. However, a highly selective and almost 65 times more sensitive bio-sensor was prepared by Lihua Jin et al (LOD 10 nM).…”

Facile synthesis of up‐conversionCit‐NaYF4:Yb,Tm @phenol‐formaldehyde resin@Ag composites for the sensitive detection ofS2−

“…For the UC@PFR@Ag composites, Figure 5(b), line a shows that the absorbance of the Ag NPs was approximately 430 nm, which partly overlapped with the emission of the UC@PFR composites. In a FRET system, a complete or part overlap of the donor's emission spectrum and the absorption spectrum of acceptor is needed 32,33 . The overlap integral of UC@PFR and Ag NPs is 2.1 × 10 −14 cm 3 L mol −1 , as shown in Figure 5(b), which is effective in establish the FRET between UC@PFR nanosphere and Ag NPs.…”

Ligand functionalized copper nanoclusters for versatile applications in catalysis, sensing, bioimaging, and optoelectronics

“…Among these sensing schemes, the detection based on absorption and emission properties has been employed more frequently, and included in situ synthesis of fluorescent Cu NCs (through the turn on/turn-off mechanism), fluorescent quenching through the inner filter effect (IFE), FRET, and electron transfer, and enhanced fluorescent intensity (mostly due to AIE mechanisms). Accordingly, a lot of studies have recently been conducted on potential applications of Cu NCs as a fluorescent sensor for detection of various compounds such as anions, namely, halides (Cl À , Br À and I À ), 63,201 S 2À , 28,153,165,202,203 64 and phosphate; 204 cations, such as Ag + , 63,205 This journal is © The Royal Society of Chemistry and the Chinese Chemical Society 2019…”

“…This chemosensor was employed to detect Fe 3+ in real water samples, including tap water and river water with recoveries in the range of 82. . A turn-on PL sensor based on silk fibroin (SF) protected-Cu NCs (SF@Cu NCs) has been developed by Zhang et al 203 It was used to detect S 2À in aqueous solutions with a LOD of B0.3 mM and a linear range of 5-110 mM. The working mechanism of the sensor was ascribed to the assembly induced emission enhancement (AIEE).…”