Tunable Photoluminescence from Graphene Oxide

Chien, Chih-Tao; Li, Shao Sian; Lai, Wei-Jung; Yeh, Yun-Chieh; Chen, Hsin‐An; Chen, I-Shen; Chen, Li‐Chyong; Chen, Kuei‐Hsien; Nemoto, Takashi; Isoda, Seiji; Chen, Mingwei; Fujita, Takeshi; Eda, Goki; Yamaguchi, Hisato; Chhowalla, Manish; Chen, Chun-Wei

doi:10.1002/ange.201200474

Cited by 71 publications

(84 citation statements)

References 24 publications

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“…2 shows the PL spectra acquired at room temperature and under excitation wavelength of 420 nm for FGO, PN and FGO/PN composite. The PL spectrum of GO shows similar peaks to the results reported in the literature for as-produced GO [14,15]. These peaks originate from the recombination of electron-hole (e-h) pairs, localized within small sp 2 carbon clusters embedded within a sp 3 matrix and agglomeration phenomena.…”

Section: Steady-state Photoluminescencesupporting

confidence: 80%

Photoluminescence Quenching and Structure of Nanocomposite Based on Graphene Oxide Layers Decorated with Nanostructured Porphyrin

Bajjou

Mongwaketsi

Khenfouch

et al. 2015

Nanomaterials and Nanotechnology

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Nanocomposites based on few-layers graphene oxide (FGO) decorated with porphyrin nanorods (PN) were synthesized and the interfacial interaction between these two components was investigated by using scanning electron microscopy (SEM), photoluminescence spectroscopy, resonant Raman scattering and Fourier transform infrared (FT-IR) techniques. SEM showed good exfoliation of FGO and its successful interaction with the PN. The photoluminescence results showed an important interaction between FGO and PN resulting in a quenching of the photoluminescence of the PN-FGO composite. Resonant Raman with PN aggregates and FT-IR results revealed a π-π intermolecular interaction confirming the energy/charge transfer. Moreover, the investigation of X-ray diffraction confirmed the intercalation of PN in FGO and their disaggregation. The findings presented here are an important contribution to achieving the functionalization of graphene derivative surfaces with PN for various optoelectronic applications and particularly photovoltaic cells.

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Section: Steady-state Photoluminescencesupporting

confidence: 80%

Photoluminescence Quenching and Structure of Nanocomposite Based on Graphene Oxide Layers Decorated with Nanostructured Porphyrin

Bajjou

Mongwaketsi

Khenfouch

et al. 2015

Nanomaterials and Nanotechnology

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“…The hydroxyl group is bonded with the single-crystalline GQD lattice most likely at edge sites rather than at basal plane sites. This unique edge-site functionalization could not induce any sp 3 defects within the graphene basal plane, which is different from random functionalization commonly observed in graphene oxide [42][43][44] and highly defective GQDs 2,11-13,16-23,33,34,36,37 cut from carbon materials. Their thicknesses characterized by atomic force microscope (AFM; Fig.…”

Section: Resultsmentioning

confidence: 54%

“…High-quality colloidal GQDs with excellent optical properties are highly desirable for solutionprocessable applications including bioimaging 13,[15][16]20,[26][27][28][29] , biosensing 25,[30][31][32][33] , light emitting diodes (LEDs) 6,34 , solar cells 4,6,8,10,19,35,36 and photocatalysis 21,22 . Recently, chemical and electrochemical cutting routes have been developed to produce water-soluble colloidal GQDs 2,6,8,9,[11][12][13][16][17][18][19][20][21][22][23]33,34,36,37 and derivatives (carbon dots [38][39][40][41] and graphene oxide nanoparticles [42][43]…”

mentioning

confidence: 99%

Gram-scale synthesis of single-crystalline graphene quantum dots with superior optical properties

et al. 2014

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Graphene quantum dots (GQDs) have various alluring properties and potential applications, but their large-scale applications are limited by current synthetic methods that commonly produce GQDs in small amounts. Moreover, GQDs usually exhibit polycrystalline or highly defective structures and thus poor optical properties. Here we report the gram-scale synthesis of single-crystalline GQDs by a facile molecular fusion route under mild and green hydrothermal conditions. The synthesis involves the nitration of pyrene followed by hydrothermal treatment in alkaline aqueous solutions, where alkaline species play a crucial role in tuning their size, functionalization and optical properties. The single-crystalline GQDs are bestowed with excellent optical properties such as bright excitonic fluorescence, strong excitonic absorption bands extending to the visible region, large molar extinction coefficients and long-term photostability. These high-quality GQDs can find a large array of novel applications in bioimaging, biosensing, light emitting diodes, solar cells, hydrogen production, fuel cells and supercapacitors.

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“…This type of redshift is an indicative of combined aromatic groups or cyclic molecules with several pi (π) bonds [22]. The fluorescence exhibited by the graphene oxide may be due to the optical transitions occurring in the π-π* gap of sp 2 sites [23,24]. The role of sp 2 clusters within the sp 3 matrix is very prominent in deciding the emission wavelengths.…”

Section: Resultsmentioning

confidence: 99%