Surface tailoring of polyacrylate-grafted graphene oxide for controlled interactions at the biointerface

Consiglio, Giuseppe; Pietro, Patrizia Di; D’Urso, Luisa; Forte, Giuseppe; Grasso, Giuseppe; Sgarlata, Carmelo; Cossement, Damien; Snyders, Rony; Satriano, Cristina

doi:10.1016/j.jcis.2017.07.080

Cited by 22 publications

(31 citation statements)

References 55 publications

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“…23 Owing to the increase in the amount of the polar oxygen groups, the C 1s peak becomes more asymmetric and broadens towards the high binding energy side. 29 This trend is clearly observed as the graphite is converted to GO (as discussed above) and for the P-GO as well. 29 Furthermore, upon the grafting of polyacrylate on GO, the C 1s peak of of P-GO broadened further ( Fig.…”

Section: Resultsmentioning

confidence: 61%

“…29 This trend is clearly observed as the graphite is converted to GO (as discussed above) and for the P-GO as well. 29 Furthermore, upon the grafting of polyacrylate on GO, the C 1s peak of of P-GO broadened further ( Fig. 2(a)), which can be attributed to the relative increase of contributions from the carbon-oxygen double bonds (C3+C4 components from ~11%…”

Section: Resultsmentioning

confidence: 61%

“…22,29 The C 1s XPS spectrum of starting GO is indicative of the high degree of oxidation with the characteristic peaks observed at ~285.0, 286.5 eV, 288.4, 292.9 and 295.6 eV corresponding to C-C/C-H, C-OH, C=O, O=C-OH and ππ* shake up satellite, respectively. 18,22,29 It should be noted that various structural models of GO include an epoxide group (C-O-C) which has a binding energy similar to that of C-OH, however its precise contribution is difficult to ascertain. In their work on the thermal deoxygenation of GO, Shar ma et al 23 have attributed the component at ~286.5 eV to the C-O-C group with the smaller components at ~ 287.5 and 288.9 eV being ascribed to carbonyl (>C=O) and carboxyl groups (O=C-OH).…”

Section: Resultsmentioning

confidence: 99%

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Polyacrylate grafted graphene oxide nanocomposites for biomedical applications

Ganya

Soin

Moloi

et al. 2020

Journal of Applied Physics

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Utilising a reverse micelle process, we have grafted polyacrylate (P) on graphene oxide (GO) to realise polyacrylate-graphene oxide (P-GO) nanocomposites, upon whose subsequent reduction, polyacrylatereduced graphene oxide (P-rGO) nanocomposites are achieved. Using techniques such as ultraviolet photoelectron spectroscopy (UPS), X-ray photoelectron spectroscopy and X-ray absorption near edge structure (XANES) spectroscopy, in conjunction with high resolution microscopy, Raman spectroscopy and superconducting quantum interference device analysis, we have studied in-depth the electronic, microstructural, electrical and magnetic properties of these P-GO and P-rGO nanocomposites. While the polyacrylate grafting ensures a high solubility of the P-GO and P-rGO, the P-rGO nanocomposites additionally show a near doubling of the paramagnetic response (9.6 × 10-3 emu/g) as compared to the r-GO (5.6 × 10-3 emu/g) and P-GO (5.5 × 10-3 emu/g), respectively at 2 K. The grafting of diamagnetic polyacrylate enhances the magnetic response for the P-GO and P-rGO owing to the increase in the defect states, sp 3-type bonding and enhanced magnetic coupling between the magnetic moments arising due to the presence of nitrogen functionalities. This behaviour is further corroborated via the measurements of the electronic structure by XANES and UPS measurements. Thus, the possibility of manipulation of the magnetic behaviour along with the abundance of surface functional groups makes both P-GO and P-rGO nanocomposites highly conducive for deriving water-soluble functionalised graphene by linking affinity molecules with polyacrylate backbone for biological and bio-medical applications.

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Section: Resultsmentioning

confidence: 61%

Section: Resultsmentioning

confidence: 61%

Section: Resultsmentioning

confidence: 99%

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Polyacrylate grafted graphene oxide nanocomposites for biomedical applications

Ganya

Soin

Moloi

et al. 2020

Journal of Applied Physics

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“…The peak at 1730 cm −1 is assigned to the characteristic C=O vibration peak of –NHCOO–, which is due to the formation of hydrogen bonds, while the shift to lower wavenumber and higher intensity indicate that a large number of urethane bonds are generated . There is no stretching vibration peak of –NCO at 2274 cm −1 , suggesting the complete absence of any residual –NCO in the system . The stretching vibration peaks of methyl and methylene at 2945 and 2865 cm −1 are not clearly observed in the spectrum because the KPG absorption peak coincides with that of the WPUA film.…”

Section: Resultsmentioning

confidence: 93%

Preparation and properties of modified graphene oxide incorporated waterborne polyurethane acrylate

Yin

Muhammad

et al. 2019

Polymer International

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In this study, a new modifier (KPG) was prepared by modifying graphene oxide with -glycidoxypropyl trimethoxysilane (KH560) and polydimethylsiloxane (PDMS). KPG was in turn added to aqueous urethane acrylate for the fabrication of waterborne polyurethane polyacrylate emulsion modified with KH560-PDMS composite (KPG/WPUA). Textural characterizations of the KPG/WPUA coating were achieved via Fourier transform infrared, SEM, TGA and AFM techniques, which revealed that the KPG/WPUA film possessed a smooth surface. The synthesized KPG/WPUA films were tested for mechanical properties, hydrophobicity and acid/water corrosion performance which suggested their highly hydrophobic surface. KPG/WPUA with 0.1% KPG showed a contact angle of 118.35 ∘ , 30.35 ∘ higher than that of pristine WPUA. The KPG/WPUA film exhibited higher thermal stability, i.e. a 5% weight loss temperature of 305 ∘ C, which was 30 ∘ C higher than that of pristine WPUA film. The Young's modulus and elongation at break of the KPG/WPUA film were 34.1 MPa and 74.88% respectively, which were higher than that of WPUA film. Furthermore, KPG/WPUA films exhibited greater resistance (without obvious blistering and the white spotting phenomenon) to H 2 O 2 , HCl and water corrosion than pristine WPUA. The superior performance of KPG/WPUA films was attributed to the network chain structure formed upon the introduction of KPG into WPUA. The outstanding performance of KPG/WPUA films in terms of mechanical properties, thermal stability and high resistance to acidic and water corrosion makes them interesting alternative contenders for target applications.

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“…The bwGO was suspended in ultrapure water to reach a final concentration of 0.4 mg/mL with 120 min sonication (59 kHz, 25 • C) and then ultra-sonicated 2 h with a titanium cup-horn sonicator (Hielscher UP200Ht) at 200 W and 24 kHz to obtain bwGO120. The as-prepared suspension was centrifuged (20 min at 15,871× g RCF, RT) and the supernatant (bwGO120S), containing nanosheets of 200-nm average lateral size [72], and the pellet (bwGO120P) were lyophilized overnight.…”

Section: Preparation Of Base-washed Graphene Oxidementioning

confidence: 99%

Theranostic Nanoplatforms of Thiolated Reduced Graphene Oxide Nanosheets and Gold Nanoparticles

et al. 2020

Self Cite

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In this study, graphene oxide (GO) and reduced-thiolated GO (rGOSH) were used as 2D substrate to fabricate nanocomposites with nanoparticles of gold nanospheres (AuNS) or nanorods (AuNR), via in situ reduction of the metal salt precursor and seed-mediated growth processes. The plasmonic sensing capability of the gold-decorated nanosheets were scrutinized by UV-visible (UV-VIS) spectroscopy. Attenuated total reflectance Fourier transform infrared spectroscopy (ATR-FTIR), thermogravimetric analyses (TGA), and atomic force microscopy (AFM) were performed in order to prove the actual reduction that occurred concomitantly with the thiolation of GO, the increase in the hydrophobic character as well as the size, and preferential gathering of the gold nanoparticles onto the nanosheet substrates, respectively. Moreover, the theoretical electronic and infrared absorption (UV-VIS and IR) spectra were calculated within a time-dependent approach of density functional theory (DFT). Eventually, in vitro cellular experiments on human neuroblastoma cells (SH-SY5Y line) were carried out in order to evaluate the nanotoxicity of the nanocomposites by the 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide tetrazolium reduction (MTT) colorimetric assay. Results pointed out the promising potential of these hybrids as plasmonic theranostic platforms with different hydrophilic or hydrophobic features as well as cytotoxic effects against cancer cells.

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Surface tailoring of polyacrylate-grafted graphene oxide for controlled interactions at the biointerface

Cited by 22 publications

References 55 publications

Polyacrylate grafted graphene oxide nanocomposites for biomedical applications

Polyacrylate grafted graphene oxide nanocomposites for biomedical applications

Preparation and properties of modified graphene oxide incorporated waterborne polyurethane acrylate

Theranostic Nanoplatforms of Thiolated Reduced Graphene Oxide Nanosheets and Gold Nanoparticles

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