Cobalt(ii) ions detection using carbon dots as an sensitive and selective fluorescent probe

Abstract

A simple method was designed for detecting cobalt ions (Co 2+ ) based on the analyte induced fluorescence quenching of carbon dots (CDs). CDs with a quantum yield of 38.7% were synthesized by hydrothermal treatment of carbopol 934 and diethylenetriamine. Through the metal-ligand interaction, the prepared CDs can highly sensitive and selective detection of Co 2+ . The color changes (from transparent to brown) of the solution can be clearly seen with naked eye. This effective sensing platform shows high sensitivity and selectivity towards Co 2+ . Moreover, the CDs are also successfully utilized for monitoring natural water quality about Co 2+ contents.

Dual functional N- and S-co-doped carbon dots as the sensor for temperature and Fe3+ ions

“…Especially, distinguishing from metal-based quantum dots, C-dots possess high chemical inertness, low toxicity and good biocompatibility, which can be prepared with facile synthesis approaches. At present, a broad series of methods have been developed for their preparation since fluorescent C-dots were named since 2006 by Sun et al [12], such as chemical oxidation method [13], ultrasonic method [14], hydrothermal synthesis [15] [16], solvothermal method [17], microwave method [18] and laser ablation method [19] which can be divided into two classes of methods, "top-down" and "bottom-up" [20]. Among them, thermal treatment synthesis is regarded as a simple, direct and efficient route for synthesis of C-dots with novel properties.…”

The Application of Silver Nanoclusters to Sensing, Cell Imaging and Construction of Molecular Logic Gates

“…Excess Co 2+ may cause rhinitis, allergic dermatitis, asthma as well as pathogenic infections in the lung parenchyma due to inhalation of dust contaminated with Co. Adverse role of Co poisoning in living organisms may also arise in the form of gastrointestinal distress and heart failure ,,. On the other hand, thiols in biological systems play a significant role in the maintenance of life.…”

“…Adverse role of Co poisoning in living organisms may also arise in the form of gastrointestinal distress and heart failure. [3,25,26] On the other hand, thiols in biological systems play a significant role in the maintenance of life. Among biological thiols, glutathione (GSH), cysteine (Cys) and homocysteine (Hcy) have drawn crucial attention for reversible redox reactions and important cellular functions.…”

Surface passivation of carbon dots with ethylene glycol and their high-sensitivity to Fe3+

“…25 For these aqueous solutions, the refractive index for the solvents is Scheme 1 A schematic illustration of (a) the synthesis procedure of the H-CDs and (b) the formation process between H-CDs and Fe 3+ for the chelate compound.…”