Carbon quantum dots directly generated from electrochemical oxidation of graphite electrodes in alkaline alcohols and the applications for specific ferric ion detection and cell imaging

The Analyst ◽  
2016 ◽  
Vol 141 (9) ◽  
pp. 2657-2664 ◽  
Author(s):  
Mengli Liu ◽  
Yuanhong Xu ◽  
Fushuang Niu ◽  
J. Justin Gooding ◽  
Jingquan Liu
Keyword(s):  
Quantum Dots ◽  
Optical Properties ◽  
Electrochemical Oxidation ◽  
Cell Imaging ◽  
Carbon Quantum Dots ◽  
Ferric Ion ◽  
Graphite Electrodes ◽  
Low Toxicity ◽  
Water Dispersibility ◽  
Ferric Ion Detection

Carbon quantum dots (CQDs) are attracting tremendous interest owing to their low toxicity, water dispersibility, biocompatibility, optical properties and wide applicability.

scholarly journals Formation of Carbon Quantum Dots via Hydrothermal Carbonization: Investigate the Effect of Precursors

Energies ◽  
2021 ◽  
Vol 14 (4) ◽  
pp. 986
Author(s):  
Md Rifat Hasan ◽  
Nepu Saha ◽  
Thomas Quaid ◽  
M. Toufiq Reza
Keyword(s):  
Quantum Dots ◽  
Optical Properties ◽  
Microcrystalline Cellulose ◽  
Uv Light ◽  
Synthesis Method ◽  
Hydrothermal Carbonization ◽  
Carbon Quantum Dots ◽  
Medical Diagnostics ◽  
Particle Size Range ◽  
Wide Range

Carbon quantum dots (CQDs) are nanomaterials with a particle size range of 2 to 10 nm. CQDs have a wide range of applications such as medical diagnostics, bio-imaging, biosensors, coatings, solar cells, and photocatalysis. Although the effect of various experimental parameters, such as the synthesis method, reaction time, etc., have been investigated, the effect of different feedstocks on CQDs has not been studied yet. In this study, CQDs were synthesized from hydroxymethylfurfural, furfural, and microcrystalline cellulose via hydrothermal carbonization at 220 °C for 30 min of residence time. The produced CQDs showed green luminescence behavior under the short-wavelength UV light. Furthermore, the optical properties of CQDs were investigated using ultraviolet-visible spectroscopy and emission spectrophotometer, while the morphology and chemical bonds of CQDs were investigated using transmission electron microscopy and Fourier-transform infrared spectroscopy, respectively. Results showed that all CQDs produced from various precursors have absorption and emission properties but these optical properties are highly dependent on the type of precursor. For instance, the mean particle sizes were 6.36 ± 0.54, 5.35 ± 0.56, and 3.94 ± 0.60 nm for the synthesized CQDs from microcrystalline cellulose, hydroxymethylfurfural, and furfural, respectively, which appeared to have similar trends in emission intensities. In addition, the synthesized CQDs experienced different functionality (e.g., C=O, O-H, C-O) resulting in different absorption behavior.

Synthesis of amphiphilic carbon quantum dots with phosphorescence properties and their multifunctional applications

2016 ◽  
Vol 4 (42) ◽  
pp. 10146-10153 ◽  
Author(s):  
Jing Tan ◽  
Jie Zhang ◽  
Wang Li ◽  
Liqun Zhang ◽  
Dongmei Yue
Keyword(s):  
Quantum Dots ◽  
Cell Imaging ◽  
Carbon Quantum Dots ◽  
Ion Detection ◽  
Two Photon

Amphiphilic quantum dots with phosphorescence properties have been synthesized and applied for ion detection and two-photon cell imaging.

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