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 Green Preparation of Fluorescent Nitrogen-Doped Carbon Quantum Dots for Sensitive Detection of Oxytetracycline in Environmental Samples

Nanomaterials ◽  
2020 ◽  
Vol 10 (8) ◽  
pp. 1561
Author(s):  
Rong Gao ◽  
Zhibin Wu ◽  
Li Wang ◽  
Jiao Liu ◽  
Yijun Deng ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Tap Water ◽  
Orange Peel ◽  
Carbon Quantum Dots ◽  
Sensitive Detection ◽  
Biomass Waste ◽  
Visible Absorption ◽  
Nitrogen Doped ◽  
Relative Standard ◽  
Nitrogen Doped Carbon

Nitrogen-doped carbon quantum dots (N-CQDs) with strong fluorescence were prepared by a one-step hydrothermal method using natural biomass waste. Two efficient fluorescent probes were constructed for selective and sensitive detection of oxytetracycline (OTC). The synthesized N-CQDs were characterized by UV-visible absorption spectra, fluorescence spectra, Fourier transform infrared spectroscopy (FT-IR), X-ray photon spectroscopy (XPS), atomic force microscopy (AFM), and high-resolution transmission electron microscopy (HRTEM), which proved that the synthesized N-CQDs surface were functionalized and had stable fluorescence performance. The basis of N-CQDs detection of OTC was discussed, and various reaction conditions were studied. Under optimized conditions, orange peel carbon quantum dots (ON-CQDs) and watermelon peel carbon quantum dots (WN-CQDs) have a good linear relationship with OTC concentrations in the range of 2–100 µmol L−1 and 0.25–100 µmol L−1, respectively. ON-CQDs and WN-CQDs were both successfully applied in detecting the OTC in pretreated tap water, lake water, and soil, with the recovery rate at 91.724–103.206%, and the relative standard deviation was less than 5.35%. The results showed that the proposed N-CQDs proved to be green and simple, greatly reducing the detection time for OTC in the determination environment.

scholarly journals Synthesis of polyurethane-derived nitrogen-doped carbon dots for a high-performance fluorescence bioimaging probe

RSC Advances ◽  
2021 ◽  
Vol 11 (54) ◽  
pp. 34174-34180
Author(s):  
Fang-Jun Cao ◽  
Lu Wang ◽  
Cheng-Li Feng ◽  
Xiao Lin ◽  
Hui Feng
Keyword(s):  
Quantum Dots ◽  
High Performance ◽  
Solvothermal Method ◽  
Carbon Quantum Dots ◽  
Soluble Nitrogen ◽  
Nitrogen Doped ◽  
Fluorescence Bioimaging ◽  
Polyurethane Sponge ◽  
Doped Carbon Dots ◽  
Nitrogen Doped Carbon

A universal and robust strategy using polyurethane sponge as a precursor was developed to synthesize highly-soluble nitrogen-doped carbon quantum dots via a solvothermal method.

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.

scholarly journals Nitrogen doped carbon quantum dots demonstrate no toxicity under in vitro conditions in a cervical cell line and in vivo in Swiss albino mice

2019 ◽  
Vol 8 (3) ◽  
pp. 395-406 ◽  
Author(s):  
Vimal Singh ◽  
Sunayana Kashyap ◽  
Umakant Yadav ◽  
Anchal Srivastava ◽  
Ajay Vikram Singh ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Cell Line ◽  
Biomedical Imaging ◽  
Carbon Quantum Dots ◽  
Nitrogen Doped ◽  
Cervical Cell ◽  
Potential Applications ◽  
Nitrogen Doped Carbon

Carbon quantum dots (CQDs) and their derivatives have potential applications in the field of biomedical imaging.

scholarly journals Production of nitrogen-doped carbon quantum dots with controllable emission wavelength, excellent sensing of Fe3+ in aqueous solution, and potential application for stealth quick response coding in the visible regime

RSC Advances ◽  
2021 ◽  
Vol 11 (54) ◽  
pp. 34117-34124
Author(s):  
Yu-Hsun Su ◽  
Hsuan-Hao Huang ◽  
Chao-Chi Tseng ◽  
Hsin-Jung Tsai ◽  
Wen-Kuang Hsu
Keyword(s):  
Quantum Dots ◽  
Carbon Quantum Dots ◽  
Quick Response ◽  
Transfer Printing ◽  
Environmental Friendliness ◽  
Nitrogen Doped ◽  
Thermal Transfer ◽  
Potential Applications ◽  
Nitrogen Doped Carbon ◽  
Response Coding

Carbon quantum dots have received attention due to their environmental friendliness, low biological toxicity and production cost. Polymer–CQD composite fibers, detection of Fe3+, and stealthy fluorescent labels made by thermal transfer printing are potential applications.

scholarly journals Nitrogen-doped carbon quantum dots for fluorescence detection of Cu2+ and electrochemical monitoring of bisphenol A

RSC Advances ◽  
2018 ◽  
Vol 8 (36) ◽  
pp. 20000-20006 ◽  
Author(s):  
Xinran Wu ◽  
Lina Wu ◽  
Xizhong Cao ◽  
Ying Li ◽  
Anran Liu ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Bisphenol A ◽  
Electrochemical Detection ◽  
Fluorescence Detection ◽  
Carbon Dots ◽  
Carbon Quantum Dots ◽  
Nitrogen Doped ◽  
Doped Carbon Dots ◽  
Nitrogen Doped Carbon ◽  
Electrochemical Monitoring

Nitrogen-doped carbon dots were applied in the fluorescence detection of Cu2+ and electrochemical detection of BPA.

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