Mechanism of Photoluminescence from Chemically Derived Graphene Oxide: Role of Chemical Reduction

Gan, Zhixing; Xiong, Shi‐Jie; Wu, Xinglong; Xu, Tao; Zhu, Xiaobin; Gan, Xiao; Guo, Junhong; Jin, Shangtai; Sun, Litao; Chu, Paul K.

doi:10.1002/adom.201300368

Cited by 172 publications

(125 citation statements)

References 41 publications

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“…In particular, the onset of the ORR is, for the S-GOQDs, shifted by 113 mV with respect to pure GOQDs. 54,71,72 This is in line with previous works in the literature, which state that in graphene the edges are characterized by higher electroactivity than the basal plane because of the distortion of the electronic density and of the possible presence of special functional groups. As shown by Table 3, the synergistic effect of the co-doping influences the reduction potential onset, which is 21 mV more positive than in S-GOQDs, with an overall gain of 134 mV with respect to the pure GOQDs.…”

Section: B Photo-physical Properties Of Pure and Doped-goqdssupporting

confidence: 91%

Multiple doping of graphene oxide foams and quantum dots: new switchable systems for oxygen reduction and water remediation

Favaro¹,

Carraro²,

Cattelan³

et al. 2015

J. Mater. Chem. A

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ARTICLE This journal isSingle-and multi-Boron, Nitrogen, Sulphur doped graphene oxide quantum dots and threedimensional foams are synthesized by a simple and environmental friendly electrochemical method. The electrochemical activity of these materials in the oxygen reduction reaction is investigated by cyclic voltammetry and rotating disk electrode measurements. The experimental data demonstrate that the reaction selectivity is controlled by the oxidation degree of the materials: as-prepared graphene oxide quantum dots, which present highly oxidized functional groups, follow a two-electron reduction pathway and produce hydrogen peroxide, whereas after a reduction treatment by NaBH 4 , the same materials favour a fourelectron reduction of oxygen to water. The high selectivity and high efficiency of the graphene oxide quantum dots for the production of hydrogen peroxide can be efficiently used for water remediation applications (phenol decomposition). ARTICLEThis journal is

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Section: B Photo-physical Properties Of Pure and Doped-goqdssupporting

confidence: 91%

Multiple doping of graphene oxide foams and quantum dots: new switchable systems for oxygen reduction and water remediation

Favaro¹,

Carraro²,

Cattelan³

et al. 2015

J. Mater. Chem. A

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“…The microsphere emission color shifted to higher wavelength but emission spectra showed the hypochromic shift (Figure S3, Supporting Information). The phenomena were also reported for graphene quantum dots or carbon dots as well . The hypochromic shift in the microspheres can be correlated to their absorbance spectra as there is less absorbance at a higher wavelength ( Figure d).…”

Section: Resultssupporting

confidence: 60%

Poly(cyclotriphosphazene‐co‐tris(4‐hydroxyphenyl)ethane) Microspheres with Intrinsic Excitation Wavelength Tunable Multicolor Photoluminescence

Basharat

Liu

Zhang

et al. 2019

Macro Chemistry & Physics

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Functional photoluminescent materials with a tunable multicolor emission without incorporation of metals is the current focus on luminescent materials due to their multifaceted applications. Herein, novel poly(cyclotriphosphazene‐co‐tris(4‐hydroxyphenyl)ethane) microspheres are synthesized with size distribution of ≈0.8–1.6 µm by reacting hexachlorocyclotriphosphazene and tris(4‐hydroxyphenyl)ethane at different molar ratios under facile conditions. The thermogravimetric analysis shows that the microspheres are highly thermally stable with 10% weight loss at around 500 °C. Fluorescence microscopy results show that the microspheres emit three blue, green, and red colors with an emission maximum at 487, 530, and 623 nm under different excitation wavelengths of 365, 420, and 546 nm, respectively. Furthermore, under UV and visible (365 and 420 nm) excitations, microspheres demonstrate extraordinary photobleaching stability and highly intense luminescence for expending time and repeating excitations. The microspheres also demonstrate semiconductor‐like optical absorption at 235–285 nm with a tail extended to 700 nm. This exploration provides an insight for the preparation of intrinsic superior wavelength tunable multicolor emission materials from phosphazene. These microspheres are potential candidates for anti‐counterfeits, solar cells, full spectrum fluorescence emitters, organic light emitting diodes, biological, catalysis applications and unlock new areas of research on multicolor photoluminescence.

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“…Raman spectra of C spheres and Au‐C core‐shell spheres are shown in Figure b. Both spectra show a G band at around 1590 cm −1 corresponding to the first‐order scattering of the E 2g mode of sp 2 carbon domains, and a D band at around 1350 cm −1 stemming from sp 3 ‐hybridized carbon, structural defects, carbon amorphous, or edge planes . A magnified Raman spectrum of C sphere can be found in Supporting Information Figure S8, from which a weak G band can be resolved.…”

Section: Resultsmentioning

confidence: 99%

Highly Efficient Solar‐Driven Photothermal Performance in Au‐Carbon Core‐Shell Nanospheres

et al. 2017

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Optical absorptions, electron–phonon interactions, and thermal conductances at the interface are the key factors for excellent photothermal (PT) agents. To simultaneously enhance them, Au‐cored carbon nanospheres show high photothermal energy conversion efficiency. A broadband enhancement in optical absorption is acquired by broadening the size distribution of the Au cores, and hot electron–phonon interactions are reinforced through plasmon–phonon couplings. The conversion efficiency of the composites is found to be as high as 33.84%, which is improved by 73.8 and 405% compared to the pure carbon spheres and Au nanoparticles (NP), respectively. The Au‐carbon core‐shell nanospheres, acting as a general design of solar‐driven photothermal agent, have a unique property of effectively heating of bulk surroundings, and they can be extensively applied to solar‐driven energy and sustainable development in the future.

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Mechanism of Photoluminescence from Chemically Derived Graphene Oxide: Role of Chemical Reduction

Cited by 172 publications

References 41 publications

Multiple doping of graphene oxide foams and quantum dots: new switchable systems for oxygen reduction and water remediation

Multiple doping of graphene oxide foams and quantum dots: new switchable systems for oxygen reduction and water remediation

Poly(cyclotriphosphazene‐co‐tris(4‐hydroxyphenyl)ethane) Microspheres with Intrinsic Excitation Wavelength Tunable Multicolor Photoluminescence

Highly Efficient Solar‐Driven Photothermal Performance in Au‐Carbon Core‐Shell Nanospheres

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