Direct synthesis of carbon quantum dots in aqueous polymer solution: one-pot reaction and preparation of transparent UV-blocking films

2017 ◽  
Vol 5 (10) ◽  
pp. 5187-5194 ◽  
Author(s):  
Samuel C. Hess ◽  
Fitri A. Permatasari ◽  
Hiromitsu Fukazawa ◽  
Elia M. Schneider ◽  
Ratna Balgis ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Elevated Temperature ◽  
Polymer Solution ◽  
Uv Light ◽  
Direct Synthesis ◽  
Composite Films ◽  
Carbon Quantum Dots ◽  
One Pot ◽  
Aqueous Polymer ◽  
Aqueous Polymer Solution

Synthesized transparent CQD–PVA composite films performed stable UV-A blocking, even after exposure to UV light for several days and elevated temperature.

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.

A green synthetic route for the surface-passivation of carbon dots as an effective multifunctional fluorescent sensor for the recognition and detection of toxic metal ions from aqueous solution

2019 ◽  
Vol 11 (4) ◽  
pp. 490-506 ◽  
Author(s):  
K. Radhakrishnan ◽  
P. Panneerselvam ◽  
M. Marieeswaran
Keyword(s):  
Aqueous Solution ◽  
Quantum Dots ◽  
Carbon Dots ◽  
Surface Passivation ◽  
Fluorescent Sensor ◽  
Toxic Metal ◽  
Carbon Quantum Dots ◽  
Synthetic Route ◽  
One Pot ◽  
Hydrothermal Methods

In this work, a green synthetic route was used to create a number of surface passivated fluorescent carbon quantum dots, which are explored as promising sensing probes, via facile one-pot hydrothermal methods.

Optimal Drying Conditions of Porous Material Wetted with Aqueous Polymer Solution.

2003 ◽  
Vol 29 (1) ◽  
pp. 144-146 ◽  
Author(s):  
Hironobu Imakoma ◽  
Ryo Omori ◽  
Katsuyuki Kubota ◽  
Masamichi Yoshida
Keyword(s):  
Porous Material ◽  
Polymer Solution ◽  
Aqueous Polymer ◽  
Aqueous Polymer Solution ◽  
Drying Conditions

Control of Polymer Content Profile within Dried Porous Material Wetted with Aqueous Polymer Solution.

2002 ◽  
Vol 28 (4) ◽  
pp. 488-489 ◽  
Author(s):  
Hironobu Imakoma ◽  
Tatsuhiro Nakazawa ◽  
Katsuyuki Kubota ◽  
Masamichi Yoshida
Keyword(s):  
Porous Material ◽  
Polymer Solution ◽  
Polymer Content ◽  
Aqueous Polymer ◽  
Aqueous Polymer Solution

Convective-conductive Drying Characteristics of Thin Shrinkable Fibrous Layer Wetted with Aqueous Polymer Solution

2003 ◽  
Vol 29 (5) ◽  
pp. 695-697 ◽  
Author(s):  
Hironobu Imakoma ◽  
Takeshi Mori ◽  
Katsuyuki Kubota ◽  
Masamichi Yoshida
Keyword(s):  
Polymer Solution ◽  
Fibrous Layer ◽  
Drying Characteristics ◽  
Aqueous Polymer ◽  
Aqueous Polymer Solution
Sign in / Sign up

Export Citation Format

Share Document