Synthesis and characterization of GO-hydrogels composites

Pereyra, Jesica Yanina del Carmen; Cuello, Emma Antonia; Rodríguez, Rusbel Coneo; Barbero, C.; Yslas, Edith Inés; Salavagione, Horacio J.; Acevedo, Diego F.

doi:10.1088/1757-899x/258/1/012002

Cited by 8 publications

(13 citation statements)

References 18 publications

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“…Natural graphite powder (Aldrich) was oxidized using the modified Hummers method [37]. The GO synthesis depicted has been extensively employed, as well as the GO produced has been exhaustively characterized by our research group [18,35,38]. Briefly, graphite powder (2 g) was added to concentrated H 2 SO 4 (200 mL) immersed in an ice bath.…”

Section: Synthesismentioning

confidence: 99%

“…However, using traditional electrodes, the oxidation peaks of these species overlap, making the simultaneous determination impossible [8][9][10][11][12][13]. To overcome this problem, various modified electrodes based on graphene have been developed [5,[14][15][16], since GO exhibits good conductivity, wide potential window, large electrochemical active surface area, relatively inert electrochemistry, and high electrocatalytic activity [17,18].Several nanomaterials has been extensively studied and applied in technological devices such as sensors, due to mainly their novel properties [19][20][21][22][23]. Among them, water-soluble sulfonated graphene [14], chitosan graphene [15], chemically reduced graphene oxide [16,17], and electrochemically reduced graphene oxide (ER-GO) [24] have been developed into modified electrodes.…”

mentioning

confidence: 99%

“…This is in contrast with modified electrodes where complex data analysis is required [34], since the diffusion is constrained by the finite thickness of the films.Consider the above mentioned, the incorporation of GO into a soft matrix based on crosslinked acrylamides to obtain a nanocomposite (NanoC) that works as an active material is shown. NanoC offers the following useful advantage: (i) the application to electrochemically determinate DA is straightforward, since it is not necessary to modify the glassy carbon electrode; (ii) the manipulation is easy, because NanoC is a monolithic piece separated from an electrode that can be synthesized in bulk; (iii) NanoC can be independently characterized by: ultraviolet-visible (UV-vis) and FTIR spectroscopies, scanning electron microscopy (SEM), mechanical assays and others [18,35]; and (iv) since the solid NanoC acts as electrolyte, the sampling of analytes from different environments could be separated from the electrochemical detection, allowing the building of portable devices.In this research work, NanoC was used as a platform to preload and detect simultaneously DA and AA, using a bare glassy carbon without further treatment, by employing electrochemical technique. The nanocomposite interacts selectively with the molecules under study choosing a suitable pH.…”

mentioning

confidence: 99%

mentioning

confidence: 99%

“…Consider the above mentioned, the incorporation of GO into a soft matrix based on crosslinked acrylamides to obtain a nanocomposite (NanoC) that works as an active material is shown. NanoC offers the following useful advantage: (i) the application to electrochemically determinate DA is straightforward, since it is not necessary to modify the glassy carbon electrode; (ii) the manipulation is easy, because NanoC is a monolithic piece separated from an electrode that can be synthesized in bulk; (iii) NanoC can be independently characterized by: ultraviolet-visible (UV-vis) and FTIR spectroscopies, scanning electron microscopy (SEM), mechanical assays and others [18,35]; and (iv) since the solid NanoC acts as electrolyte, the sampling of analytes from different environments could be separated from the electrochemical detection, allowing the building of portable devices.…”

mentioning

confidence: 99%

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Hydrogel-Graphene Oxide Nanocomposites as Electrochemical Platform to Simultaneously Determine Dopamine in Presence of Ascorbic Acid Using an Unmodified Glassy Carbon Electrode

et al. 2018

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The detection of dopamine, an important neurotransmitter in the central nervous system, is relevant because low levels of dopamine can cause brain disorders. Here, a novel electrochemical platform made of a hydrogel–graphene oxide nanocomposite was employed to electrochemically determine simultaneously dopamine (DA) and ascorbic acid (AA). Unlike previous work, where the base electrode is modified, the active material (graphene oxide, GO) was dispersed in the hydrogel matrix, making an active nanocomposite where the electrochemical detection occurs. The GO, hydrogel and nanocomposite synthesis is described. Dynamic Light Scattering, UV-visible and FTIR spectroscopies showed that the synthesized GO nanoparticles present 480 nm of diagonal size and a few sheets in height. Moreover, the polymer swelling, the adsorption capacity and the release kinetic of DA and AA were evaluated. The nanocomposite showed lower swelling capacity, higher DA partition coefficient and faster DA release rate than in the hydrogel. The electrochemical measurement proved that both materials can be employed to determine DA and AA. Additionally, the nanocomposite platform allowed the simultaneous determination of both molecules showing two well separated anodic peaks. This result demonstrates the importance of the incorporation of the nanomaterial inside of the hydrogel and proves that the nanocomposite can be used as a platform in an electrochemical device to determinate DA using an unmodified glassy carbon electrode.

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