Quantum-confined bandgap narrowing of TiO2 nanoparticles by graphene quantum dots for visible-light-driven applications

2016 ◽  
Vol 52 (59) ◽  
pp. 9208-9211 ◽  
Author(s):  
Shujun Wang ◽  
Ivan S. Cole ◽  
Qin Li
Keyword(s):  
Quantum Dots ◽  
Visible Light ◽  
Tio2 Nanoparticles ◽  
Graphene Quantum Dots ◽  
Visible Light Range ◽  
Bandgap Narrowing ◽  
Uv Absorbers ◽  
Visible Light Driven ◽  
Quantum Confined ◽  
First Time

We for the first time report a quantum-confined bandgap narrowing mechanism through which the absorption of two UV absorbers, namely the graphene quantum dots (GQDs) and TiO2 nanoparticles, can be easily extended into the visible light range in a controllable manner.

scholarly journals Visible-Light Driven TiO2 Photocatalyst Coated with Graphene Quantum Dots of Tunable Nitrogen Doping

Molecules ◽  
2019 ◽  
Vol 24 (2) ◽  
pp. 344 ◽  
Author(s):  
Xiong Sun ◽  
Hui-Jun Li ◽  
Nanquan Ou ◽  
Bowen Lyu ◽  
Bojie Gui ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Photocatalytic Activity ◽  
Visible Light ◽  
Light Absorption ◽  
Photocatalytic Performance ◽  
Light Emission ◽  
Graphene Quantum Dots ◽  
Visible Light Absorption ◽  
Visible Light Driven ◽  
Nitrogen Doped Graphene

Nitrogen doped graphene quantum dots (NGQDs) were successfully prepared via a hydrothermal method using citric acid and urea as the carbon and nitrogen precursors, respectively. Due to different post-treatment processes, the obtained NGQDs with different surface modifications exhibited blue light emission, while their visible-light absorption was obviously different. To further understand the roles of nitrogen dopants and N-containing surface groups of NGQDs in the photocatalytic performance, their corresponding composites with TiO2 were utilized to degrade RhB solutions under visible-light irradiation. A series of characterization and photocatalytic performance tests were carried out, which demonstrated that NGQDs play a significant role in enhancing visible-light driven photocatalytic activity and the carrier separation process. The enhanced photocatalytic activity of the NGQDs/TiO2 composites can possibly be attributed to an enhanced visible light absorption ability, and an improved separation and transfer rate of photogenerated carriers.

scholarly journals A visible-light-driven composite photocatalyst of TiO2 nanotube arrays and graphene quantum dots

2014 ◽  
Vol 5 ◽  
pp. 689-695 ◽  
Author(s):  
Donald K L Chan ◽  
Po Ling Cheung ◽  
Jimmy C Yu
Keyword(s):  
Electron Microscopy ◽  
Quantum Dots ◽  
Visible Light ◽  
Graphene Quantum Dots ◽  
Infrared Spectrometry ◽  
Nanotube Arrays ◽  
X Ray Diffraction ◽  
Transmission Electron ◽  
Visible Light Driven ◽  
Photo Response

TiO2 nanotube arrays are well-known efficient UV-driven photocatalysts. The incorporation of graphene quantum dots could extend the photo-response of the nanotubes to the visible-light range. Graphene quantum dot-sensitized TiO2 nanotube arrays were synthesized by covalently coupling these two materials. The product was characterized by Fourier-transform infrared spectrometry (FTIR), scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), thermogravimetric analysis (TGA) and UV–vis absorption spectroscopy. The product exhibited high photocatalytic performance in the photodegradation of methylene blue and enhanced photocurrent under visible light irradiation.

Fe3O4/carbon quantum dots hybrid nanoflowers for highly active and recyclable visible-light driven photocatalyst

2014 ◽  
Vol 2 (38) ◽  
pp. 15740-15745 ◽  
Author(s):  
Hui Wang ◽  
Zengyan Wei ◽  
Hiroshi Matsui ◽  
Shuiqin Zhou
Keyword(s):  
Quantum Dots ◽  
Visible Light ◽  
Carbon Quantum Dots ◽  
Strong Absorption ◽  
Water Dispersible ◽  
Highly Efficient ◽  
Highly Active ◽  
Visible Light Range ◽  
Photocatalytic Activities ◽  
Visible Light Driven

Water dispersible Fe3O4@carbon quantum dots (CQDs) hybrid nanoflowers show highly efficient photocatalytic activities because of their strong absorption in the visible light range and upconversion photoluminescence.

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