Synthesis and characterization of sulfophenyl-functionalized reduced graphene oxide sheets

Ossonon, Benjamin Diby; Bélanger, Daniel

doi:10.1039/c6ra28311j

Cited by 423 publications

(197 citation statements)

References 105 publications

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“…[62] It can also be attributed to the structural changes that occur during the nanocomposite formation, whereby partial graphitic (sp 2 ) structure is restored. [63] This is also supported by the PXRD pattern of the sonochemically prepared composite, wherein it shows a peak corresponding to the graphitic structure as explained. In case of the nanocomposite prepared by the sonochemical method, a slight deviation (24 cm -1 ) in the position of D band and lowering of the I D /I G ratio as compared to the GO only sample is seen, which may be attributed to the interaction of metal ions with the organic functionalities on the GO surface.…”

Section: Surface and Morphological Characterizationsupporting

confidence: 62%

“…A low I D /I G ratio indicates an increase in the crystallite size that results in diminished disorder in GO associated with oxygen functional groups due to the harsh oxidation employed in preparing the GO . It can also be attributed to the structural changes that occur during the nanocomposite formation, whereby partial graphitic (sp 2 ) structure is restored . This is also supported by the PXRD pattern of the sonochemically prepared composite, wherein it shows a peak corresponding to the graphitic structure as explained.…”

Section: Resultsmentioning

confidence: 65%

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Copper/Cuprous Oxide Nanoparticles Decorated Reduced Graphene Oxide Sheets Based Platform for Bio‐Electrochemical Sensing of Dopamine

2019

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A rudimentary simple sonochemical approach has been employed for the synthesis of copper/cuprous oxide nanoparticles (Cu/Cu2O NPs) decorated graphene oxide (GO) sheets. Simply, an aqueous dispersion of GO was sonochemically treated with Cu/Cu2O NPs as obtained through a simple electrochemical dissolution method to get the Cu/Cu2O/rGO nanocomposite. The decoration of Cu/Cu2O NPs on GO sheets resulted in the excellent sensing activity of Cu/Cu2O/rGO nanocomposite towards dopamine in the pharmaceutical formulation at the electrode interface due to enhanced electron mobility in GO sheet and high catalytic activity of Cu/Cu2O NPs. The comparison has been laid out based on various characterization techniques viz. powder X‐ray diffraction (PXRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier transform infra‐red (FTIR) spectroscopy and Raman spectroscopy. The fabricated sensor depicted high sensitivity of 0.806 μA/μM for dopamine in a broad linear range of 0.25 –17 μM. Moreover, the remarkable detection limit of 2.6 nM was found for dopamine, and the developed sensor exhibited a wide separation ca. 140 mV between the respective detection peaks of dopamine and uric acid, which is a major interferent in the analysis of dopamine.

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Section: Surface and Morphological Characterizationsupporting

confidence: 62%

Section: Resultsmentioning

confidence: 65%

Copper/Cuprous Oxide Nanoparticles Decorated Reduced Graphene Oxide Sheets Based Platform for Bio‐Electrochemical Sensing of Dopamine

2019

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“…In addition, the spectrum does not show the characteristic stretching vibrational bands of CN in amide groups at ≈1260 cm −1 that are commonly known as demonstrative evidence for covalent conjugation . At the same time, the peak at 1712 cm −1 , characteristic of carboxylic acid and carbonyl moieties, is present in the spectrum of the nanocomposite, demonstrating that thionine is predominantly conjugated to GA via noncovalent π–π interactions. The slight shift in the thionine bands of the nanocomposite is likely due to the π network.…”

Section: Resultsmentioning

confidence: 87%

Thionine Functionalized 3D Graphene Aerogel: Combining Simplicity and Efficiency in Fabrication of a Metal‐Free Redox Supercapacitor

Shabangoli

Rahmanifar

El‐Kady

et al. 2018

Advanced Energy Materials

163

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transportation sector with electric vehicles. [1] The potential of renewable energy to power electric vehicles can contribute to a future world with cleaner skies, cheaper energy, and healthier air. Energy distribution can also be simplified by sending electrons over the grid, or even by locally generating energy using solar panels, instead of shipping chemical fuels through pipelines or via road transport. One of the core technologies required to realize the viability of renewable energy sources is to develop improved electrochemical energy storage systems. [2] Electric doublelayer capacitors (EDLCs) are more appropriate for high-power applications, while secondary batteries are well suited for high-energy applications. EDLCs are thus sometimes used in tandem with batteries so that the former provide power and the latter provide energy for the integrated system. Current research in the field of energy storage is converging to target single devices that have EDLClevel power density as well as cycling stability and battery-level energy density. [3] Supercapacitors are an important technology for the future of energy storage. Supercapacitors are especially designed for applications that require a high rate capability, where a sudden burst of energy in a very short time interval is needed. However, supercapacitors have a rather limited energy density. Thus, different charge storage mechanisms, in addition to and/or in place of EDLCs, have been developed to boost the energy content of supercapacitors. [4] The most intriguing approach is the incorporation of nanostructured solid-state electrode materials, mainly transition metal oxides/sulfides, [5] layered double hydroxides, [2b] or conductive polymers, [6] that utilize fast Faradaic redox reactions for energy storage. Another intriguing approach is the development of hybrid ion capacitors, which are intermediate in energy between batteries and supercapacitors, while demonstrating supercapacitor-like power performance and cycling stability. [7] Inspired by the solid-state pseudocapacitive charge storage mechanism, the concept of liquid-state redox electrolytes has also been developed to supply extra energy. [8] Via this fascinating approach, the dead weight of the formerly inert electrolytes is utilized as an active component to augment the energy storage performance, and the wasted Discovering efficient pseudocapacitive charge storage materials has become one of the grand challenges to reduce the gap between high energy density batteries and high power density and durable electrical double-layer capacitors.This research direction is facilitated by the introduction of redox-active species that add Faradaic charge storage to the system. However, the astonishing abilities of organic redox species to increase energy density are insufficient to compensate for their poor electrical conductivity and inferior cyclability. Herein, it is proposed that these challenges can be simultaneously met by thoughtful selection of a redox species, thionine, that can be conjugate...

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“…The BJH pore size distribution with mesoporous nature and high specific surface area of the sample EC-GC10 demonstrates that the thermal reduction with loss of oxygen functional group has created more porosity when compared to that of the other two samples and this may be due to high-temperature annealing 53 . The above-obtained BET reports suggest that the sample having a high specific surface area with mesoporous nature may play a significant role and can also afford ideal pathways that will improve current density in PSC device 54 .…”

Section: Resultsmentioning

confidence: 88%

Perovskite Solar Cells: A Porous Graphitic Carbon based Hole Transporter/Counter Electrode Material Extracted from an Invasive Plant Species Eichhornia Crassipes

Pitchaiya

Eswaramoorthy

Muthukumarasamy³

et al. 2020

Sci Rep

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perovskite solar cells (pScs) composed of organic polymer-based hole-transporting materials (HtMs) are considered to be an important strategy in improving the device performance, to compete with conventional solar cells. Yet the use of such expensive and unstable HTMs, together with hygroscopic perovskite structure remains a concern -an arguable aspect for the prospect of onsite photovoltaic (PV) application. Herein, we have demonstrated the sustainable fabrication of efficient and air-stable PSCs composed of an invasive plant (Eichhornia crassipes) extracted porous graphitic carbon (ec-Gc) which plays a dual role as HTM/counter electrode. The changes in annealing temperature (~450 °C, ~850 °C and ~1000 °C) while extracting the EC-GC, made a significant impact on the degree of graphitization -a remarkable criterion in determining the device performance. Hence, the fabricated champion device-1 c : Glass/fto/c-tio 2 /mp-tio 2 /cH 3 nH 3 pbi 3−x cl x /EC-GC10@CH 3 nH 3 pbi 3−x cl x /EC-GC10) exhibited a PCE of 8.52%. Surprisingly, the introduced EC-GC10 encapsulated perovskite interfacial layer at the perovskite/HtM interface helps in overcoming the moisture degradation of the hygroscopic perovskite layer in which the same champion device-1 c evinced better air stability retaining its efficiency ~94.40% for 1000 hours. We believe that this present work on invasive plant extracted carbon playing a dual role, together as an interfacial layer may pave the way towards a reliable perovskite photovoltaic device at low-cost.Lower cost, shorter payback time and an unprecedented rise in power conversion efficiency (PCE) escalating from 3.8% in 2009 to 24.2% (2019) have turned the attention of researchers and industrial community towards perovskite solar cells (PSCs) within a decade 1-5 . Outstanding photovoltaic properties such as high charge carrier mobility, long electron-hole diffusion length, high absorption coefficient with tuneable bandgap property, low-exciton binding energy, and easy solution preparation techniques make it to compete with traditional commercial silicon solar cells 6,7 . In general, a typical PSC is composed of an electron transport layer (ETL), an active absorbing layer, a HTL, and a counter electrode. Nevertheless, the use of expensive and unstable conducting polymers based hole transporting materials (HTMs) such as (2,2′,7,7′-tetrakis(N,N-di-p-methoxyphenylamine)-9

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Synthesis and characterization of sulfophenyl-functionalized reduced graphene oxide sheets

Abstract: We report modification of graphene oxide by thermal reduction to obtain reduced graphene oxide and subsequent functionalization with sulfophenyl groups to obtain SRGO as well as the characterization of these materials by TGA-MS.

Cited by 423 publications

References 105 publications

Copper/Cuprous Oxide Nanoparticles Decorated Reduced Graphene Oxide Sheets Based Platform for Bio‐Electrochemical Sensing of Dopamine

Copper/Cuprous Oxide Nanoparticles Decorated Reduced Graphene Oxide Sheets Based Platform for Bio‐Electrochemical Sensing of Dopamine

Thionine Functionalized 3D Graphene Aerogel: Combining Simplicity and Efficiency in Fabrication of a Metal‐Free Redox Supercapacitor

Perovskite Solar Cells: A Porous Graphitic Carbon based Hole Transporter/Counter Electrode Material Extracted from an Invasive Plant Species Eichhornia Crassipes

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