Graphene Oxide Nanosheet Wrapped White-Emissive Conjugated Polymer Nanoparticles

Yoo, Doo-Yeol; Tu, Nguyen Dien Kha; Lee, Su Jin; Lee, Eunji; Jeon, Seong Ran; Hwang, Seokhwan; Lim, Ho Sun; Kim, Jong Kyu; Ju, Byeong Kwon; Kim, Heesuk; Lim, Jung Ah

doi:10.1021/nn4050968

Cited by 23 publications

(11 citation statements)

References 43 publications

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“…While the green band was suggested to be a result of the presence of a GO nanosheet shell surrounding the PFO NPs, PL decay analysis (Fig. (b)) showed that the PFO NPs wrapped in GO have a longer luminescence lifetime in comparison to the neat PFO NPs . Similar observations were made for the EL of such hybrid structures.…”

Section: Altering the Emission Properties Of Conjugated Polymers By Bsupporting

confidence: 67%

Altering the emission properties of conjugated polymers

Botiz

Aştilean

Stingelin

2015

Polymer International

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Many technological applications that have had tremendous impact on our society and lifestyle are exploiting the emission properties of organic species such as conjugated polymers and organic small‐molecule semiconductors. The most prominent case‐in‐point here are possibly organic light‐emitting diodes, which have found use in information displays, touch screens and beyond. To further advance the rapid development of these powerful and versatile technologies, it will be of paramount importance to gain fundamental insights about which strategies and processes we can employ to alter, control and eventually enhance the emission properties of this interesting class of material. In this work, we focus on macromolecular systems and review the most important categories of tools that can be employed to efficiently alter their emission properties by manipulating their molecular architecture and electronic structure; by influencing their molecular ordering, packing motifs and overall microstructure; as well as by utilizing the ability of some of these materials to respond to external stimuli and other physical parameters (pressure, light exposure etc.) and/or to interact with other compounds, including systems of different functionalities. © 2015 Society of Chemical Industry

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Section: Altering the Emission Properties Of Conjugated Polymers By Bsupporting

confidence: 67%

Altering the emission properties of conjugated polymers

Botiz

Aştilean

Stingelin

2015

Polymer International

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“…However, now they are always spotted in close contact with wrinkled sheets of GO, indicating the creation of intimate interface interactions and thus the formation of true P3HT NPs –GO nanohybrids. While Figure c eventually may suggest a wrapping of the P3HT NPs by GO sheets as observed in studies on poly(9,9‐di‐ n ‐octylfluorenyl‐2,7‐diyl) nanoparticles using small GO sheets, AFM studies rather suggest a deposition of the forming P3HT NPs onto the micrometer sized GO sheets, whose original size should not be affected by the employed reprecipitation process. This may even lead to the creation of larger agglomerates of P3HT NPs on the GO sheets as shown in Figure d.…”

Section: Resultsmentioning

confidence: 85%

Conjugated Polymer Nanoparticle–Graphene Oxide Charge‐Transfer Complexes

Istif

Hernández‐Ferrer

Urriolabeitia

et al. 2018

Adv Funct Materials

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The game-changing role of graphene oxide (GO) in tuning the excitonic behavior of conjugated polymer nanoparticles is described for the first time. This is demonstrated by using poly(3-hexylthiophene) (P3HT) as a benchmark conjugated polymer and employing an in situ reprecipitation approach resulting in P3HT nanoparticles (P3HT NPs ) with sizes of 50-100 nm in intimate contact with GO. During the self-assembly process, GO changes the crystalline packing of P3HT chains in the forming P3HT NPs from H to H/J aggregates exhibiting exciton coupling constants as low as 2 meV, indicating favorable charge separation along the P3HT chains. Concomitantly, π-π interface interactions between the P3HT NPs and GO sheets are established resulting in the creation of P3HT NPs -GO charge-transfer complexes whose energy bandgaps are lowered by up to 0.5 eV. Moreover, their optoelectronic properties, preestablished in the liquid phase, are retained when processed into thin films from the stable aqueous dispersions, thus eliminating the critical dependency on external processing parameters. These results can be transferred to other types of conjugated polymers. Combined with the possibility of employing water based "green" processing technologies, chargetransfer complexes of conjugated polymer nanoparticles and GO open new pathways for the fabrication of improved optoelectronic thin film devices.

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“…One specific example was in the work done by Zhao’s group 50 , who fabricated graphene wrapped mesoporous Silica nanoparticles with the total radius around ~50 nm which is very similar to our model. Besides the electrostatic self-assembly, graphene wrapped dielectric particles can be fabricated in an emulsification process 51 as well. Though experimental deviation from an idealized spherical graphene coating, as well as surface roughness, can’t be avoided, the above experimental evidences underscore the relevance of the geometry beyond a theoretical perspective.…”

Section: Resultsmentioning

confidence: 99%

Low-threshold optical bistability of graphene-wrapped dielectric composite

Huang

Miroshnichenko

Gao

2016

Sci Rep

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We theoretically study the effective third-order nonlinear response and optical bistability of the 3D graphene based composite consisting of graphene wrapped dielectric nanoparticles embedded in dielectric host at terahertz frequencies. Taking into account the nonlinear conductivity of graphene, we derive the analytical expressions for the effective third-order nonlinear coefficient in weakly nonlinear limit. Moreover, for strong applied fields, the criterion for achieving optical bistability in such a graphene coated sphere, as well as the switching thresholds of optical bistability are discussed. We find that both and optical bistability are strongly dependent on the Fermi energy of graphene and it is possible to achieve very low switching thresholds under the normal graphene dissipation. We further propose a scheme to study the transmittance of this nonlinear composite slab. These results reveal novel regime of the optical bistability of the transmittance of light. We show that this kind of graphene-wrapped composite, which has tunable and low threshold optical bistability, can be the best candidate for unique nonlinear optical materials.

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Graphene Oxide Nanosheet Wrapped White-Emissive Conjugated Polymer Nanoparticles

Cited by 23 publications

References 43 publications

Altering the emission properties of conjugated polymers

Altering the emission properties of conjugated polymers

Conjugated Polymer Nanoparticle–Graphene Oxide Charge‐Transfer Complexes

Low-threshold optical bistability of graphene-wrapped dielectric composite

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