Recent developments in edge-selective functionalization of surface of graphite and derivatives – a review

Aliyeva, Solmaz; Alosmanov, Rasim; Buniyatzadeh, Irada; Azizov, Abdulsaid A.; Maharramov, Abel M.

doi:10.1080/1539445x.2019.1600549

Cited by 16 publications

(10 citation statements)

References 101 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It may be argued that pure graphene is not easily dispersable in water. However, there are several possibilities to obtain a stable dispersion of graphene in water, such as modifying the graphene surface [45][46][47][48][49][50] , or adding dispersants to the solution 51,52 . In these situations, our theory is expected to apply as long as the slip length remains larger than the platelet's thickness.…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Hydrodynamic slip can align thin nanoplatelets in shear flow

2020

View full text Add to dashboard Cite

The large-scale processing of nanomaterials such as graphene and MoS 2 relies on understanding the flow behaviour of nanometrically-thin platelets suspended in liquids. Here we show, by combining non-equilibrium molecular dynamics and continuum simulations, that rigid nanoplatelets can attain a stable orientation for sufficiently strong flows. Such a stable orientation is in contradiction with the rotational motion predicted by classical colloidal hydrodynamics. This surprising effect is due to hydrodynamic slip at the liquid-solid interface and occurs when the slip length is larger than the platelet thickness; a slip length of a few nanometers may be sufficient to observe alignment. The predictions we developed by examining pure and surface-modified graphene is applicable to different solvent/2D material combinations. The emergence of a fixed orientation in a direction nearly parallel to the flow implies a slip-dependent change in several macroscopic transport properties, with potential impact on applications ranging from functional inks to nanocomposites.

show abstract

Section: Resultsmentioning

confidence: 99%

“…Increasing graphene's dispersibility will not necessarily alter the relevant hydrodynamic stress distribution at the particle surface. For example a selective modification of the edges of a graphene platelet can lead to an improved dispersibility 49,50 without altering the slip at the basal surface.…”

Section: Resultsmentioning

confidence: 99%

Hydrodynamic slip can align thin nanoplatelets in shear flow

2020

View full text Add to dashboard Cite

show abstract

“…For example, surface chemical modification of graphene nanoparticles is generally needed to obtain good dispersion of graphene in water, and when functionalisation is applied to the planar region of the platelet, the slip length is expected to be reduced (Wei, Peng & Xu 2014). Particles for which the functionalisation is limited to the particle edges may not have this problem (Park et al 2017;Aliyeva et al 2019), and could be more suitable to confirm the theory. Detecting rotation may not be trivial.…”

Section: Discussionmentioning

confidence: 99%

Effect of hydrodynamic slip on the rotational dynamics of a thin Brownian platelet in shear flow

2021

View full text Add to dashboard Cite

show abstract

“…Functionalization of carbon‐based surfaces is mainly categorized in covalent and non‐covalent methods. [ 20,21 ] Typically, covalent functionalization is described for introducing changes in the pristine structure of carbon, causing disruption of the π ‐ π conjugated structure, and hence, modification of the hybridization state from carbon sp 2 to sp 3 . These changes are considered to be detrimental to electrical properties.…”

Section: Introductionmentioning

confidence: 99%

“…[ 21,22 ] To ensure the integrity of the carbon pristine structure, maintaining the sp 2 hybridization state that confers the good electrical properties found for these materials, non‐covalent functionalization based on the formation of hydrophobic and van der Waals interactions and π‐π stacking are more suitable. [ 20,21 ] The main compounds applied for this functionalization method are based on conjugated and aromatic structures. [ 23–29 ] For carbon on paper‐based substrates, polyaniline, [ 24,25 ] polypyrrole [ 26 ] and other carbon derivatives such as oxidized multiwalled carbon nanotubes [ 27 ] have already been demonstrated.…”

Section: Introductionmentioning

confidence: 99%

Polydopamine nanofilms for high‐performance paper‐based electrochemical devices

et al. 2021

View full text Add to dashboard Cite

Since the discovery of polydopamine (PDA), there has been a lot of progress on using this substance to functionalize many different surfaces. However, little attention has been given to prepare functionalized surfaces for the preparation of flexible electrochemical paper‐based devices. After fabricating the electrodes on paper substrates, we formed PDA on the surface of the working electrode using a chemical polymerization route. PDA nanofilms on carbon were characterized by contact angle (CA) experiments, X‐ray photoelectron spectroscopy, scanning electron microscopy, atomic force microscopy (topography and electrical measurements) and electrochemical techniques. We observed that PDA introduces chemical functionalities (RNH2 and RC═O) that decrease the CA of the electrode. Moreover, PDA nanofilms did not block the heterogeneous electron transfer. In fact, we observed one of the highest standard heterogeneous rate constants (ks) for electrochemical paper‐based electrodes (2.5 ± 0.1) × 10−3 cm s−1, which is an essential parameter to obtain larger currents. In addition, our results suggest that carbonyl functionalities are ascribed for the redox activity of the nanofilms. As a proof‐of‐concept, the electrooxidation of nicotinamide adenine dinucleotide showed remarkable features, such as, lower oxidation potential, electrocatalytic peak currents more than 30 times higher when compared to unmodified paper‐based electrodes and electrocatalytic rate constant (kobs) of (8.2 ± 0.6) × 102 L mol−1 s−1.

show abstract

Recent developments in edge-selective functionalization of surface of graphite and derivatives – a review

Cited by 16 publications

References 101 publications

Hydrodynamic slip can align thin nanoplatelets in shear flow

Hydrodynamic slip can align thin nanoplatelets in shear flow

Effect of hydrodynamic slip on the rotational dynamics of a thin Brownian platelet in shear flow

Polydopamine nanofilms for high‐performance paper‐based electrochemical devices

Contact Info

Product

Resources

About