Semi-quantitative and visual assay of copper ions by fluorescent test paper constructed with dual-emission carbon dots

Abstract

A ratiometric fluorescence nanosensor has been developed by mixing blue fluorescent carbon dots and orange fluorescent carbon dots for the detection of copper ions.

Ultra-highly fluorescent N doped carbon dots-CdTe QDs nanohybrids with excitation-independent emission in the blue-violet region

“…Carbon-based dots (CDs), which are composed of sp 2 carbon structures and different surface functional groups, are a new kind of carbon nanomaterials that exhibit unique luminescent properties due to quantum connement and structural edge effects. 1,2 Compared to conventional luminescent semiconductor quantum dots (QDs), CDs have attracted more attention in the elds of optoelectronics, 3,4 biomedical 5,6 and environmental sciences 7,8 for the advantages of robust chemical inertness, low toxicity and good biocompatibility. 9,10 However, most of the CDs reported exhibit a relatively low photoluminescence (PL) quantum yield (QY) (less than 3%), which greatly limits their applications.…”

Review on carbon dots: Synthesis and application in biology field

“…In the presence of Cu (II), CDs had fluorescence quenching effect, realizing the detection of Cu (II). [122] In addition, in view of Cu (II) can promote the recruitment of β-amyloid in Alzheimer's disease, You Jung Chung et al synthesized o-phenylenediamine-derived carbon dots (OPCDs). OPCDs had N-containing polyaromatic compounds on the surface, which attracted Cu (II) to prevent the orderly β-layer accumulation of Aβ peptides.…”

“…Researchers use CA and urea as precursors to synthesize N‐CDs and modify Cys on their surface. In the presence of Cu (II), CDs had fluorescence quenching effect, realizing the detection of Cu (II) [122] . In addition, in view of Cu (II) can promote the recruitment of β‐amyloid in Alzheimer's disease, You Jung Chung et al.…”