One-Pot Exfoliation of Graphite and Synthesis of Nanographene/Dimesitylporphyrin Hybrids

Bernal, M. Mar; Pérez, Emilio M.

doi:10.3390/ijms160510704

Cited by 20 publications

(10 citation statements)

References 42 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This suggested that the UV light was absorbed at a higher degree by well‐dispersed graphite flakes and sheets; this reflected the presence of the thinner and smaller graphite flakes and sheets delaminated from the graphite bulks because of the mechanical grinding process in the case of the ground graphite compared to the raw one. This finding was consistent with earlier reports . Particularly, an increase in light absorbance was observed with increases in the concentration of the light absorbate (graphene and GO) according to the Beer–Lambert law.…”

Section: Resultssupporting

confidence: 93%

Compatibilizing and reinforcing an immiscible blend based on poly(lactic acid) with delaminated graphite: From raw graphite to enhanced polymer mechanical properties

Komrapit

Punyodom

Worajittiphon

2018

J of Applied Polymer Sci

View full text Add to dashboard Cite

The centrifugation-filtration method is widely applied to the delamination of layered fillers for polymer reinforcement. However, it is a time-consuming, multistep procedure and offers low product yield. In this study, a simple mechanical grinding process was used as a delamination method for raw graphite. For the first time, without centrifugation and the removal of the graphite precipitate, the incorporation of the entire ground graphite obtained from the grinding process into a poly(lactic acid) (PLA)-poly(butylene adipate-co-terephthalate) (PBAT) immiscible blend was capable of improving the polymer mechanical properties. The composites obtained displayed an enhancement of either the ductility or strength, depending on the loaded ground graphite content. The blend films uniquely exhibited an enhanced elongation at break because of the PLA-PBAT compatibilizing role of the delaminated graphite at a low loading (0.1 phr). With the higher content of ground graphite (0.5-3 phr), the Young's modulus of the blend increased to achieve the value predicted by the Halpin-Tsai equation. Mechanical grinding required only a small amount of delamination medium without the aid of surfactants and harsh preparation conditions and, thus, was promisingly simple, cost effective, general, high yield, and practically scalable. The use of a low filler content rendered it potentially extendable to the delamination of other layered fillers available in limited amounts for high-mechanical-performance polymer composites.

show abstract

Section: Resultssupporting

confidence: 93%

Compatibilizing and reinforcing an immiscible blend based on poly(lactic acid) with delaminated graphite: From raw graphite to enhanced polymer mechanical properties

Komrapit

Punyodom

Worajittiphon

2018

J of Applied Polymer Sci

View full text Add to dashboard Cite

show abstract

“…These intrinsic properties have made them two of the most popular families of organic dyes, particularly in the frame of photovoltaics. [35][36][37][38][39][40][41][42][43][44] However, their use for the modulation of the optoelectronic properties of TMDC-based devices has not been yet described. Considering this, we decided to investigate the effects of the noncovalent functionalization of MoS2 photodetectors with the soluble PDI and tetraphenyl porphyrin (TPP) depicted in Chart 1.…”

Section: Introductionmentioning

confidence: 99%

Engineering the optoelectronic properties of MoS₂ photodetectors through reversible noncovalent functionalization

et al. 2016

View full text Add to dashboard Cite

We present an easy drop-casting based functionalization of MoS2-based photodetectors that results in an enhancement of the photoresponse of about four orders of magnitude, reaching responsivities up to 100 A·W -1 . The functionalization is technologically trivial, air-stable, fully reversible and reproducible, and opens the door to the combination of 2D-materials with molecular dyes for the development of high performance photodetectors.Among the novel two-dimensional (2D) materials, 1-8 transition metal dichalcogenides (TMDCs) [9][10][11][12] show particularly promising electronic and optoelectronic properties. 13 In particular, their intrinsic bandgap within the visible part of the spectrum, makes them highly interesting materials for optoelectronic applications.14 In fact, the presence of a bandgap has allowed for the construction of a wealth of prototype electronic devices based on TMDCs. [15][16][17][18][19][20][21][22][23][24] In the last years, there has been a significant effort to modulate the optical properties of TMDCs in order to optimize the performance of the corresponding devices. Most of the strategies investigated so far rely on physical methods, such as strain-engineering, 25,26 fieldeffect doping, 12,27 or artificial stacking of different 2D materials. 28,29 In comparison, the chemical modification of TMDCs is still rather underexplored, despite the appealing combination of low-cost and high degree of control offered by synthetic chemistry. Examples of doping of TMDCs through surface charge-transfer using metal atoms, 30 gases, 31 and a few organic molecules has already been demonstrated. 32,33 Responsivities of just a few A·W -1 have been reported for MoS2 photodetectors functionalized with a rhodamine dye, 34 a rather modest value for MoS2-based photodetectors. Among the readily available organic dyes, perylenediimides (PDIs) and porphyrins show remarkable optical properties, including large molar absorptivity -ca. 10 5 M −1 cm −1 for PDIs and 10 6 M −1 cm −1 for porphyrins-, and outstanding photostability under ambient conditions. These intrinsic properties have made them two of the most popular families of organic dyes, particularly in the frame of photovoltaics. [35][36][37][38][39][40][41][42][43][44] However, their use for the modulation of the optoelectronic properties of TMDC-based devices has not been yet described. Considering this, we decided to investigate the effects of the noncovalent functionalization of MoS2 This is the post-peer reviewed version of the following article: A.J. Molina-Mendoza et al. "Engineering the optoelectronic properties of MoS2 photodetectors through reversible noncovalent functionalization" Chem. Comm., 2016 DOI: 10.1039/C6CC07678E Which has been published in final form at: http://pubs.rsc.org/en/content/articlelanding/2016/cc/c6cc07678e#!divAbstract photodetectors with the soluble PDI and tetraphenyl porphyrin (TPP) depicted in Chart 1. Here, we describe that the supramolecular functionalization of mechanically exfoliated MoS2-based photodetector...

show abstract

“…22 Furthermore, this class of molecules exhibits unique photophysical and electrochemical properties, which are tunable by changing the functional groups on the porphyrin core as well as through interactions with metal ions in the core of the porphyrin macrocycle, 2,23 making them valuable molecules for exploring the potential of carbon-based hybrid materials. Previous studies have shown that porphyrins can be used to functionalize carbon materials such as fullerene and graphene 24 . Moreover, it was proven that photoinduced electron-transfer processes with carbon-based materials for the development of optoelectronic devices can benefit from the electron-donor characteristic of porphyrins.…”

Section: Introductionmentioning

confidence: 99%

“…24 Previous studies have shown that porphyrins can be used to functionalize carbon materials such as fullerene and graphene. 25 Moreover, it was proven that photoinduced electron-transfer processes with carbon-based materials for the development of optoelectronic devices could benefit from the electron-donor characteristic of porphyrins. 26−28 Being in this regime, the initial studies have used simple, standard porphyrins as an active layer.…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, this class of molecules exhibits unique photophysical and electrochemical properties, which are tunable by changing the functional groups on the porphyrin core as well as through interactions with metal ions in the core of the porphyrin macrocycle. , Chemical approaches to design new nanohybrid systems to improve the light-harvesting and charge-transfer (CT) processes, which lead to a final enhanced solar energy conversion efficiency, are provided and developed thanks to porphyrin derivatives and other optoelectronic functional materials . Previous studies have shown that porphyrins can be used to functionalize carbon materials such as fullerene and graphene . Moreover, it was proven that photoinduced electron-transfer processes with carbon-based materials for the development of optoelectronic devices could benefit from the electron-donor characteristic of porphyrins. − Being in this regime, the initial studies have used simple, standard porphyrins as an active layer. ,,− …”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Controllable Charge-Transfer Mechanism at Push–Pull Porphyrin/Nanocarbon Interfaces

et al. 2019

View full text Add to dashboard Cite

Ultrafast charge transfer at the interfaces between 5,15-donor-acceptor push-pull porphyrins (Por-tBu and Por-OC8) and nanocarbon materials in the form of fullerene (C60) and graphene carboxylate (GC) are investigated using femtosecond (fs) pump-probe spectroscopy with broadband capabilities. The strong photoluminescence (PL) quenching of the porphyrin indicates electron and/or energy transfer from the photoexcited porphyrin to the nanocarbon materials. More interestingly, the Stern-Volmer plots of PL quenching shows linear and nonlinear patterns upon increasing the concentration of GC or C60 in the porphyrin solution, respectively, clearly indicating static and a combination of static and dynamic quenching at the interfaces with these nanocarbon materials. Using femtosecond transient absorption (TA) spectroscopy, ultrafast electron transfer from a singlet-excited porphyrin to the nanocarbon materials is clearly identified by the fast ground state bleach recovery and the formation of cation radical species. Furthermore, a fs-TA study revealed that both porphyrins show very long-lived ground state bleach (GSB) and excited state absorption (ESA), which can be attributed to the triplet-state formation. This work provides new physical insights into the electron transfer process and its driving force in donor-accepter systems that include nanocarbon materials.

show abstract

One-Pot Exfoliation of Graphite and Synthesis of Nanographene/Dimesitylporphyrin Hybrids

Cited by 20 publications

References 42 publications

Compatibilizing and reinforcing an immiscible blend based on poly(lactic acid) with delaminated graphite: From raw graphite to enhanced polymer mechanical properties

Compatibilizing and reinforcing an immiscible blend based on poly(lactic acid) with delaminated graphite: From raw graphite to enhanced polymer mechanical properties

Engineering the optoelectronic properties of MoS₂ photodetectors through reversible noncovalent functionalization

Controllable Charge-Transfer Mechanism at Push–Pull Porphyrin/Nanocarbon Interfaces

Contact Info

Product

Resources

About