Graphene oxide as a radiation sensitive material for XPS dosimetry

Torrisi, A.; Silipigni, L.; Cutroneo, M.

doi:10.1016/j.vacuum.2020.109175

Cited by 83 publications

(29 citation statements)

References 31 publications

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“…The intensity of C-O (epoxy and hydroxy) in PrGO is comparatively lower than the GO. PrGO also possesses a higher C/O ratio of 1.4 compared to GO (1.0), manifesting removal of a large fraction of oxygenated functional groups within the GO sheet as a result of the electrochemical reduction reaction 33 , 34 . The wide scan XPS spectrum of PrGO/HKUST-1 (Fig.…”

Section: Resultsmentioning

confidence: 99%

Facile synthesis of PEDOT-rGO/HKUST-1 for high performance symmetrical supercapacitor device

Mohanadas

Abdah

Azman

et al. 2021

Sci Rep

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A novel poly(3,4-ethylenedioxythiophene)-reduced graphene oxide/copper-based metal–organic framework (PrGO/HKUST-1) has been successfully fabricated by incorporating electrochemically synthesized poly(3,4-ethylenedioxythiophene)-reduced graphene oxide (PrGO) and hydrothermally synthesized copper-based metal–organic framework (HKUST-1). The field emission scanning microscopy (FESEM) and elemental mapping analysis revealed an even distribution of poly(3,4-ethylenedioxythiophene) (PEDOT), reduced graphene oxide (rGO) and HKUST-1. The crystalline structure and vibration modes of PrGO/HKUST-1 were validated utilizing X-ray diffraction (XRD) as well as Raman spectroscopy, respectively. A remarkable specific capacitance (360.5 F/g) was obtained for PrGO/HKUST-1 compared to HKUST-1 (103.1 F/g), PrGO (98.5 F/g) and PEDOT (50.8 F/g) using KCl/PVA as a gel electrolyte. Moreover, PrGO/HKUST-1 composite with the longest charge/discharge time displayed excellent specific energy (21.0 Wh/kg), specific power (479.7 W/kg) and an outstanding cycle life (95.5%) over 4000 cycles. Thus, the PrGO/HKUST-1 can be recognized as a promising energy storage material.

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Section: Resultsmentioning

confidence: 99%

Facile synthesis of PEDOT-rGO/HKUST-1 for high performance symmetrical supercapacitor device

Mohanadas

Abdah

Azman

et al. 2021

Sci Rep

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“…Magnesium (Mg) alloys are potential biodegradable implant materials such as screws and plates for bone fixation, tissue engineering scaffolds, as well as cardiovascular stents. 1,2 Mg alloys have a density of 1.81 g cm À3 and modulus of elasticity of 45 GPa, which are relatively close to the density (1.8-2.1 g cm À3 ) and modulus of elasticity (20)(21)(22)(23)(24)(25)(26)(27) GPa) of natural bone tissues compared to other common metals such as stainless steels. [2][3][4] However, since Mg alloys typically degrade within 6-8 weeks, it is important to minimize implant loosening during the recovery period which can take up to 12 weeks.…”

Section: Introductionmentioning

confidence: 77%

“…They are in accordance with the standard phase cards of Mg (00‐035‐0821), Mg 3 N 2 (00‐001‐1,289), Ca 10 (PO 4 ) 6 (OH) 2 (01‐072‐1,243), and Ca 8 (HPO 4 ) 2 (PO 4 ) 4 (H 2 O) 5 (01‐079‐0423) corresponding to the cubic crystalline Mg 3 N 2 layer with diffraction planes of (321), (400), and (611) at 34.46°, 36.73° and 57.65°, respectively, and crystallite size of 30 nm. XPS is employed to determine the chemical states of Ca, P, O, N, and F. The survey XPS spectrum reveals the peak of Ca2p, P2p, O1s, N1s, C1s, and F1s at 350.4, 132.8, 529.6, 284.8, 404.8, and 684 eV, respectively 7,22‐28 . The high‐resolution spectra are displayed in Figure S1.…”

Section: Resultsmentioning

confidence: 99%

“…The Ca/O and Ca/P ratios are calculated to be 0.43 and 1.41 in comparison with the theoretical values of 0.38 and 1.67 for hydroxyapatite. [25][26][27] The difference between the calculated and theoretical ratios may stem from incomplete formation of HA in the top coating because of the low temperature.…”

Section: In Vitro Cell Culture Studiesmentioning

confidence: 99%

“…corresponding to the cubic crystalline Mg 3 N 2 layer with diffraction planes of (321), (400), and (611) at 34.46 , 36.73 and 57.65 , respectively, and crystallite size of 30 nm. XPS is employed to determine the chemical states of Ca, P, O, N, and F. The survey XPS spectrum reveals the peak of Ca2p, P2p, O1s, N1s, C1s, and F1s at 350.4, Bode and Bode-phase plots of the coated AZ91 Mg alloy after immersion in for 1, 24, 48, 72, 96, 108, and 120 hr (the results represent averages of three trials) T A B L E 1 EIS analysis parameters and pH values of the AZ91 Mg alloy and nitrided AZ91 Mg alloy after immersion for 1, 24, and 48 hr .8, 529.6, 284.8, 404.8, and 684 eV, respectively 7,[22][23][24][25][26][27][28]. The highresolution spectra are displayed in FigureS1.The XPS depth profile of the coated AZ91 Mg alloy (Figure2) reveals the presence of calcium and phosphorus in the top coating with a thickness of 790 nm and a PAA/Cip middle multilayer (deposited 10 times) with a total thickness of 8,650 nm (thickness of each layer is about 865 nm).…”

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Enhanced corrosion resistance and reduced cytotoxicity of the AZ91 Mg alloy by plasma nitriding and a hierarchical structure composed of ciprofloxacin‐loaded polymeric multilayers and calcium phosphate coating

Shanaghi

Mehrjou

Chu

2021

J Biomedical Materials Res

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Much effort has made to lessen the cytotoxicity and enhance the corrosion resistance of biodegradable magnesium alloys, for example, by depositing multilayered polymeric coatings containing hydroxyapatite. In this work, a hierarchical structure composed of ciprofloxacin (Cip)‐loaded on polyacrylic acid (PAA) and poly (ethyleneimine) (PEI) as biocompatible polymeric multilayers and calcium phosphate coating as the top layer is formed by the sol–gel method on the AZ91 Mg alloy with an intermediate layer formed by nitrogen plasma immersion ion implantation. The thicknesses of the multilayered coating and nitrided layer (Mg3N2) are 10 μm and 140 nm, respectively. The corrosion current density decreases by 95.6% and the corrosion potential in the polarization curve shifts to the positive direction by 23%. The passivation process which occurs at defects by deposition of corrosion products mitigates both galvanic and localized corrosion. Slight increase in the contact angle and surface free energy, enhanced corrosion resistance, and reduced cytotoxicity are observed from the multilayered structure. The better corrosion resistance enables better control of release of Cip. Biological assessment indicates that the antibacterial activity against Escherichia coli is improved by 100% after culturing for 24 hr and the cell viability and noncytotoxic behavior of the coated AZ91 are enhanced as well. The corrosion behavior and biological results suggest that the strategy of using a hierarchical structure composed of Cip‐loaded polymeric multilayers in conjunction with an intermediate plasma nitrided layer has large potential in the development of biodegradable orthopedic implants made of Mg alloys.

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Tuning the Laser‐Induced Processing of 3D Porous Graphenic Nanostructures by Boron‐Doped Diamond Particles for Flexible Microsupercapacitors

Deshmukh

Jakóbczyk

Ficek

et al. 2022

Adv Funct Materials

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Carbon (sp3)‐on‐carbon (sp2) materials have the potential to revolutionize fields such as energy storage and microelectronics. However, the rational engineering and printing of carbon‐on‐carbon materials on flexible substrates remains a challenge in wearable electronics technology. This study demonstrates the scalable fabrication of flexible laser‐induced graphene (LIG)‐boron doped diamond nanowall (BDNW) hybrid nanostructures for microsupercapacitors. Direct laser writing on polyimide film is tuned by the presence of BDNW powder where an appreciable absorbance of the BDNWs at the CO2 laser wavelength enhances the local film temperature. The thermal shock due to laser irradiation produces graphitized and amorphous carbon at the diamond grain boundaries which increases the thermal and charge transfer capacity between the LIG–diamond interfaces. The samples are further treated with O2 plasma to tune the wettability or to improve the microsupercapacitor device performance. The outstanding electrical characteristics of graphene, exceptional electrochemical stability of diamond, and essential contributions of oxygen‐containing groups result in a remarkable charge storage capacity (18 mF cm−2 @ 10 mV s−1) and cyclic stability (98% retention after 10 000 cycles) outperforming most state‐of‐the‐art LIG‐based supercapacitors. Furthermore, despite extreme mechanical stress, these microsupercapacitors maintain their outstanding electrochemical properties, thus holding promise for high‐power, flexible/wearable electronics.

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Graphene oxide as a radiation sensitive material for XPS dosimetry

Cited by 83 publications

References 31 publications

Facile synthesis of PEDOT-rGO/HKUST-1 for high performance symmetrical supercapacitor device

Facile synthesis of PEDOT-rGO/HKUST-1 for high performance symmetrical supercapacitor device

Enhanced corrosion resistance and reduced cytotoxicity of the AZ91 Mg alloy by plasma nitriding and a hierarchical structure composed of ciprofloxacin‐loaded polymeric multilayers and calcium phosphate coating

Tuning the Laser‐Induced Processing of 3D Porous Graphenic Nanostructures by Boron‐Doped Diamond Particles for Flexible Microsupercapacitors

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