Platinum/nitrogen-doped carbon nanoparticles synthesized in nitrogen-doped carbon quantum dots aqueous solution for methanol electro-oxidation

2016 ◽  
Vol 213 ◽  
pp. 332-340 ◽  
Author(s):  
Aofeng Zhang ◽  
Xingwei Li ◽  
Ying He
Keyword(s):  
Aqueous Solution ◽  
Quantum Dots ◽  
Carbon Nanoparticles ◽  
Carbon Quantum Dots ◽  
Nitrogen Doped ◽  
Electro Oxidation ◽  
Nitrogen Doped Carbon

Synthesis of Carbon Quantum Dots from Novel Carbon Sources of Black Tea and Detection of pb2+ Ions

2020 ◽  
Vol 10 (5) ◽  
pp. 596-601
Author(s):  
Dongqiang Zhang ◽  
Yuanyuan Wang ◽  
Jialin Xu ◽  
Hongxia Li ◽  
Mei Du ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Quantum Dots ◽  
Metal Ions ◽  
Black Tea ◽  
Transition Metal Ions ◽  
Carbon Quantum Dots ◽  
Diameter Distribution ◽  
Nitrogen Doped ◽  
Quenching Efficiency ◽  
Nitrogen Doped Carbon

Carbon based quantum dots (CQDs) have found their applications in various areas due to their unique properties such as photoluminescence (PL) properties, good water solubility and biocompatibility, high chemical stability, low toxicity, environmental friendliness and light bleaching resistance. Herein, a novel functional sensing platform based on bright green fluorescent nitrogen-doped carbon quantum dots (N-CQDs) was prepared for the detection of a variety of ions. Using black tea as a new carbon source, ethylenediamine as nitrogen source and surface modifier, nitrogen doped carbon quantum dots (N-CQDs) with low crystallinity, spherical and uniformly dispersed graphite structure were prepared. Its diameter distribution is between 1.0 and 3.0 nm. Unlike the other transition metal ions such as Al3+, Cu2+, Cd2+ , Hg2+, Ni2+, Fe2+, Zn2+ , and Ag +, as well as the main group metal ions such as Na +, K + , Mg2+, Ca2+ , and Ba2+ , the addition of Pb2+ to the aqueous solution of the as prepared CQDs leads to the significant quenching of the fluorescence centered at 450 nm. Such quantitative quenching effect was used to develop a CQDs sensor that is able to detect the trace amount of Pb2+ in the aqueous solution. The sensor exhibits a detection limit of 13.3 nmol/L for Pb2+ , and the quenching efficiency reaches 70.2%. The quenching mechanism was also discussed. The results in the present work indicate the Pb2+ sensor developed from the tea based CQDs may find broad application in the real time monitoring of water quality and other environmental samples.

Intense multi-state visible absorption and full-color luminescence of nitrogen-doped carbon quantum dots for blue-light-excitable solid-state-lighting

2016 ◽  
Vol 4 (38) ◽  
pp. 9027-9035 ◽  
Author(s):  
Daqin Chen ◽  
Weiwei Wu ◽  
Yongjun Yuan ◽  
Yang Zhou ◽  
Zhongyi Wan ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Solid State ◽  
Carbon Quantum Dots ◽  
Solid State Lighting ◽  
Visible Absorption ◽  
Nitrogen Doped ◽  
Full Color ◽  
Potential Applications ◽  
Doped Carbon Dots ◽  
Nitrogen Doped Carbon

Nitrogen-doped carbon dots with multi-state visible absorption and full-color blue/yellow/red emissions are synthesized, and show potential applications in solid-state-lighting.

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