Graphene-quantum-dots-based ratiometric fluorescent probe for visual detection of copper ion

Abstract

A novel dual-photoluminescence probe for Cu(2+) has been developed, in which the graphene quantum dots with blue emission and CdTe QDs with yellow emission act as internal standard and probe, respectively. The photoluminescence probe exhibited selective sensing for Cu(2+) with a limit of detection (3SD/k) of 5.3 × 10(-8) M and showed its potential application in visual imaging. The results indicated that the constructed probe can be employed for sensing Cu(2+) by the naked eye, and also for monitoring intracellular Cu(2+).

Understanding the Photoluminescence Mechanism of Nitrogen‐Doped Carbon Dots by Selective Interaction with Copper Ions

“…However, blue emission from the TLC plate was observed when Cu 2+ was introduced into the NCDs, enabling easy visual detection of Cu 2+ . Although, the sensitivity of the present sensor towards Cu 2+ ions is weaker than many of the fluorescence based detection of Cu 2+ using CDs reported, the present method demonstrated excellent selectivity towards large number of metal cations and biomolecules …”

“…Graphitic carbon nitride nanosheets and photoluminescence polymer nanodots derived from grass are two other representative example of carbon based fluorescent probe used in the selective detection of Cu 2+ . In another study, a ratiometric detection of Cu 2+ using blue luminescent graphene QDs and yellow emitting CdTe QDs was demonstrated …”

“…tive example of carbon based fluorescent probe used in the selectived etection of Cu 2 + .I na nothers tudy,aratiometric detection of Cu 2 + using blue luminescent graphene QDs and yellow emitting CdTeQDs was demonstrated. [32] In the present report, we investigated the interaction of Cu 2 + with nitrogen-rich carbond ots (NCDs) in detail.W ed iscuss the PL mechanism of the NCDs andt he effect of nitrogen on the photophysical behavior of NCDs. Also, the high specificity of the NCDs towards Cu 2 + prompted us to develop an easy fluorescences ensing strategy for Cu 2 + ions.…”

Fluorescent nanoprobes for sensing and imaging of metal ions: Recent advances and future perspectives

“…GQDs were used to detect Ag + [253], Hg 2+ [254], Cu 2+ [255,256], Cr 6+ [257], Ni 2+ [258], and Fe 3+ [259]. The Lee group [260] reported a green synthesis method for graphitic carbon QDs (GCQDs) as a fluorescent sensing platform for the highly sensitive and selective detection of Fe 3+ ions.…”

Aqueous Synthesis of Protein‐Encapsulated ZnSe Quantum Dots and Physical Significance of Semiconductor‐Induced CuII Ion Sensing

“…Thus, the suitability of BSA‐ZnSe QDs in the detection of copper ions among the physiologically relevant metal ions has been examined and its efficiency with regard to other Cd or Zn‐based quantum dots compared. Further, it has been attempted in the present work to resolve the issues pertaining to the mechanism of Cu II ion detection, such as capping ligand based binding or electron transfer processes involving quantum dots . The importance of the detection of copper lies in the fact that it is the third most abundant essential transition metal, and it plays a vital role in the electron transport chain and acts as a catalytic cofactor for superoxide dismutase, cytochrome C oxidase, and tyrosinase.…”