scholarly journals Donor–Acceptor Interaction Determines the Mechanism of Photoinduced Electron Injection from Graphene Quantum Dots into TiO2: π-Stacking Supersedes Covalent Bonding

2017 ◽  
Vol 139 (7) ◽  
pp. 2619-2629 ◽  
Author(s):  
Run Long ◽  
David Casanova ◽  
Wei-Hai Fang ◽  
Oleg V. Prezhdo
Keyword(s):  
Quantum Dots ◽  
Graphene Quantum Dots ◽  
Electron Injection ◽  
Covalent Bonding ◽  
Acceptor Interaction ◽  
Π Stacking ◽  
Donor Acceptor

scholarly journals Facet-Dependent Interfacial Charge Transfer in TiO2/Nitrogen-Doped Graphene Quantum Dots Heterojunctions for Visible-Light Driven Photocatalysis

Catalysts ◽  
2019 ◽  
Vol 9 (4) ◽  
pp. 345 ◽  
Author(s):  
Ou ◽  
Li ◽  
Lyu ◽  
Gui ◽  
Sun ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Photocatalytic Activity ◽  
Charge Transfer ◽  
Graphene Quantum Dots ◽  
Anatase Tio2 ◽  
Charge Carriers ◽  
Acceptor Interaction ◽  
Nitrogen Doped ◽  
Donor Acceptor ◽  
Interfacial Charge

Interfacial charge transfer is crucial in the efficient conversion of solar energy into fuels and electricity. In this paper, heterojunction composites were fabricated, comprised of anatase TiO2 with different percentages of exposed {101} and {001} facets and nitrogen-doped quantum dots (NGQDs) to enhance the transfer efficiency of photo-excited charge carriers. The photocatalytic performances of all samples were evaluated for RhB degradation under visible light irradiation, and the hybrid containing TiO2 with 56% {001} facets demonstrated the best photocatalytic activity. The excellent photoactivity of TiO2/NGQDs was owed to the synergistic effects of the following factors: (i) The unique chemical features of NGQDs endowed NGQDs with high electronic conductivities and provided its direct contact with the TiO2 surface via forming Ti–O–C chemical bonds. (ii) The co-exposed {101} and {001} facets were beneficial for the separation and transfer of charge carriers in anatase TiO2. (iii) The donor-acceptor interaction between NGQDs and electron-rich {101} facets of TiO2 could remarkably enhance the photocurrent, thus hindering the charge carriers recombination rate. Extensive characterization of their physiochemical properties further showed the synergistic effect of facet-manipulated electron-hole separation in TiO2 and donor-acceptor interaction in graphene quantum dots (GQDs)/TiO2 on photocatalytic activity.

Daunomycin delivery by ultrasmall graphene quantum dots to DNA duplexes: understanding the dynamics by resonance energy transfer

2020 ◽  
Vol 8 (42) ◽  
pp. 9756-9763
Author(s):  
Riya Sinha ◽  
Pradipta Purkayastha
Keyword(s):  
Quantum Dots ◽  
Energy Transfer ◽  
Graphene Quantum Dots ◽  
Resonance Energy Transfer ◽  
Resonance Energy ◽  
Dna Duplexes ◽  
Π Stacking

Crystalline graphene quantum dots are shown to carry daunomycin to DNA via π–π stacking with the planar anthracenyl moiety of the drug.

Electron injection from graphene quantum dots to poly(amido amine) dendrimers

2016 ◽  
Vol 108 (16) ◽  
pp. 161904
Author(s):  
T. N. Lin ◽  
M. R. Inciong ◽  
S. R. Santiago ◽  
C. W. Kao ◽  
G. W. Shu ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Graphene Quantum Dots ◽  
Electron Injection

Hot Electron Injection from Graphene Quantum Dots to TiO2

ACS Nano ◽  
2013 ◽  
Vol 7 (2) ◽  
pp. 1388-1394 ◽  
Author(s):  
Kenrick J. Williams ◽  
Cory A. Nelson ◽  
Xin Yan ◽  
Liang-Shi Li ◽  
Xiaoyang Zhu
Keyword(s):  
Quantum Dots ◽  
Graphene Quantum Dots ◽  
Electron Injection ◽  
Hot Electron ◽  
Hot Electron Injection

Synthesis and photophysical properties of BODIPY-decorated graphene quantum dot–phthalocyanine conjugates

2018 ◽  
Vol 42 (8) ◽  
pp. 6051-6061 ◽  
Author(s):  
Nnamdi Nwahara ◽  
Reitumetse Nkhahle ◽  
Bokolombe P. Ngoy ◽  
John Mack ◽  
Tebello Nyokong
Keyword(s):  
Quantum Dots ◽  
Quantum Dot ◽  
Singlet Oxygen ◽  
Photophysical Properties ◽  
Graphene Quantum Dots ◽  
Quantum Yields ◽  
Graphene Quantum Dot ◽  
Π Stacking

A BODIPY dye is linked to graphene quantum dots followed by immobilization of a Zn phthalocyanineviaπ–π stacking, resulting in improved triplet and singlet oxygen quantum yields.

Preparation of Graphene Quantum Dots and Their Biological Applications

2016 ◽  
Vol 31 (4) ◽  
pp. 337 ◽  
Author(s):  
SUN Xiao-Dan ◽  
LIU Zhong-Qun ◽  
YAN Hao
Keyword(s):  
Quantum Dots ◽  
Graphene Quantum Dots ◽  
Biological Applications
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