Fluorescent probe based nitrogen doped carbon quantum dots with solid-state fluorescence for the detection of Hg2+ and Fe3+ in aqueous solution

2020 ◽  
Vol 158 ◽  
pp. 105142 ◽  
Author(s):  
Jiantao Zhu ◽  
Huiyuan Chu ◽  
Tianshu Wang ◽  
Chaozhan Wang ◽  
Yinmao Wei
Keyword(s):  
Aqueous Solution ◽  
Quantum Dots ◽  
Solid State ◽  
Fluorescent Probe ◽  
Carbon Quantum Dots ◽  
Nitrogen Doped ◽  
Solid State Fluorescence ◽  
Nitrogen Doped Carbon

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.

scholarly journals Environment-dependent Emission Tuning in the Multicolor Nitrogen-doped Carbon Quantum Dots

2021 ◽  
Author(s):  
Dineshkumar Sengottuvelu ◽  
Abdul Kalam Shaik ◽  
Satish Mishra ◽  
Mahsa Abbaszadeh ◽  
Nathan Hammer ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Solid State ◽  
Large Scale ◽  
Low Cost ◽  
Visible Region ◽  
Carbon Quantum Dots ◽  
One Pot ◽  
Nitrogen Doped ◽  
Emission Changes ◽  
Nitrogen Doped Carbon

Carbon quantum dots (CQDs) are fascinating luminous materials from the carbonaceous family and are increasingly being investigated in many optoelectronic applications due to their unique photoluminescence (PL) characteristics. Herein, we report the synthesis of nitrogen-doped carbon quantum dots (NCQDs) from citric acid and m-phenylenediamine using a one-pot hydrothermal approach. The environment-dependent emission changes of NCQDs were extensively investigated in various solvents, in solid-state, and in physically assembled PMMA-PnBA-PMMA copolymer gels in 2-ethyl hexanol. The NCQDs display bright emission in various solvents as well as in solid-state and a temperature-dependent enhanced emission in gels. In detail, these NCQDs exhibit multicolor PL emission across the visible region and its enhancement upon changing the environment (solutions and polymer matrices). The NCQDs also exhibit excitation-dependent PL and solvatochromism, which are rarely observed in CQDs. Most CQDs are non-emissive in the aggregated or solid-state due to the aggregation-caused quenching (ACQ) effect, limiting their solid-state applications. However, these NCQDs display a strong solid-state emission centered at 568 nm ascribed to the presence of abundant surface functional groups, which helps to prevent the - interaction between the NCQDs and to overcome the ACQ effect in the solid-state. Interestingly, the NCQD containing gels display a significant fluorescence enhancement than the NCQDs in 2-ethyl hexanol solution because of the interaction between the polar PMMA blocks and NCQDs. This research opens up the development of large-scale, low-cost multicolor phosphor for the fabrication of optoelectronic devices, sensing, and bioimaging applications.

Preparation of nitrogen-doped carbon quantum dots and its application as a fluorescent probe for Cr(vi) ion detection

2019 ◽  
Vol 43 (14) ◽  
pp. 5488-5494 ◽  
Author(s):  
Xiaomin Luo ◽  
Pengxia Bai ◽  
Xuechuan Wang ◽  
Guohui Zhao ◽  
Jianyan Feng ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Fluorescent Probe ◽  
Hydrothermal Treatment ◽  
Carbon Quantum Dots ◽  
Synthetic Method ◽  
Ion Detection ◽  
Nitrogen Doped ◽  
Nitrogen Doped Carbon

A facile synthetic method was used to prepare N-CQDs via the hydrothermal treatment of gelatin.

Nitrogen Doped Carbon Quantum Dots Modified by Lens culinaris β-Galactosidase as a Fluorescent Probe for Detection of Lactose

2019 ◽  
Vol 29 (5) ◽  
pp. 1213-1219 ◽  
Author(s):  
Ranjana Singh ◽  
Anjali Yadav ◽  
Shashank Shekhar ◽  
Ranjan K. Ajad ◽  
Ranjan K. Singh ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Fluorescent Probe ◽  
Lens Culinaris ◽  
Carbon Quantum Dots ◽  
Nitrogen Doped ◽  
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.

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