Reduced graphene oxide multilayers for gas and liquid phases chemical sensing

Gross, Marcos A.; Sales, Maria J. A.; Soler, Maria A. G.; Pereira-da-Silva, Marcelo A.; Silva, Mauro F. P. da; Paterno, Leonardo G.

doi:10.1039/c4ra01469c

Cited by 38 publications

(34 citation statements)

References 36 publications

(43 reference statements)

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Nevertheless, our results corroborate the information of better electronic properties for GPSS when compared to GO [60] due to a better reestablishment of the sp 2 carbon network in the formed rGO nanoplatelets, which is not disturbed owing to the non-covalent interactions between PSS molecules, in close agreement with the MD simulation, Raman and FTIR analysis.…”

Section: Resultssupporting

confidence: 89%

Experimental and computational investigation of reduced graphene oxide nanoplatelets stabilized in poly(styrene sulfonate) sodium salt

Miyazaki

Borges

et al. 2018

J Mater Sci

Self Cite

View full text Add to dashboard Cite

The production of large area interfaces and the use of scalable methods to build-up designed nanostructures generating advanced functional properties are of high interest for many materials science applications. Nevertheless, large area coverage remains a major problem for pristine graphene and here we present a hybrid, composite graphene-like material soluble in water, which can be exploited in many areas, such as energy storage, electrodes fabrication, selective membranes and biosensing. Graphene oxide (GO) was produced by the traditional Hummers´ method being further reduced in the presence of poly(styrene sulfonate) sodium salt (PSS), thus creating stable reduced graphene oxide (rGO) nanoplateles wrapped by PSS (GPSS).Molecular dynamics simulations were carried out ot further clarify the interactions between PSS molecules and rGO nanoplatelets, with calculations supported by FTIR analysis. The intermolecular forces between rGO nanoplatelets and PSS lead to the formation of a hybrid material (GPSS) stabilized by van der Waals forces, allowing the fabrication of high quality layer-by-layer (LbL) films with polyalillamine hydrochloride (PAH). Raman and electrical characterizations corroborated the successful modifications in the electronic structures from GO to GPSS after the chemical treatment, resulting in (PAH/GPSS) LbL films four orders of magnitude more conductive than (PAH/GO).

show abstract

Section: Resultssupporting

confidence: 89%

Experimental and computational investigation of reduced graphene oxide nanoplatelets stabilized in poly(styrene sulfonate) sodium salt

Miyazaki

Borges

et al. 2018

J Mater Sci

Self Cite

View full text Add to dashboard Cite

show abstract

“…As was indicated before, the mentioned mechanism is more clearly manifested when the gas molecules display strong electron‐donating or withdrawing character . For the case of volatile solvents (acetone, ethanol, etc.…”

Section: Resultsmentioning

confidence: 65%

“…For the case of volatile solvents (acetone, ethanol, etc. ), another mechanism is preferred . The authors studied impedance properties of multilayered thin films of poly(diallyldimethyl ammonium‐chloride) and graphene oxide and showed that it is more likely that such analytes swell the multilayers and enlarge the distance between neighbour graphene oxide domains, which thus increases resistivity.…”

Section: Resultsmentioning

confidence: 99%

Impedance spectroscopy of single graphene layer at gas adsorption

Skryshevsky

Milovanov

Gavrilchenko

et al. 2015

Phys. Status Solidi A

View full text Add to dashboard Cite

Impedance spectroscopy and micro‐Raman spectroscopy were applied for analysis of single graphene layer. Despite that Raman spectra showed the high quality of studied layers (ratio of intensities of the D and G peaks ID/IG is better than <0.01), two semicircles on the Nyquist curve of the Ni–graphene–Ni structure suggest the existence of inhomogeneous regions. Exposure in ethanol and acetone vapors by different degrees affects the reactive and active resistance of graphene film. Moreover, the dynamic response behavior of impedance differs in the vapor of ethanol, acetone, and phenol. It ensures that impedance spectroscopy of graphene is a useful tool for detection of different gases.

show abstract

“…a shows that absorbances (in arbitrary units) registered at 230 and 300 nm scale linearly with the number of PDAC/GO bilayers. This observation reflects the stepwise growth of the film in which the amount of GO is the same in each deposited bilayer . Therefore, the film's architecture can be designed by simply varying the number of PDAC/GO bilayers.…”

Section: Resultsmentioning

confidence: 91%

Electrochemical behaviour of some redox couples at layer-by-layer assembled poly(diallyl dimethylammonium)/reduced graphene oxide electrodes

Santos

Sales

Paterno

2017

Phys. Status Solidi A

View full text Add to dashboard Cite

The electrochemical behaviour of three redox couples, namely ferri/ferrocyanide, dopamine and 1,4-naphtoquinone is investigated at the surface of ITO substrates modified with layer-by-layer assembled poly(diallyl dimethylammonium) hydrochloride (PDAC) and reduced graphene oxide (RGO) films. The study with ITO modified with PDAC/RGO films is performed by cyclic voltammetry and electrochemical impedance spectroscopy. Regardless of the type of electrode (bare ITO and PDAC/RGO-modified), the electrochemical behaviour of all three redox couples is diffusion controlled. Despite that, modification of the ITO substrate with the PDAC/RGO film decreases the electron transfer rate constant and makes more irreversible the ferri/ ferrocyanide redox interconversion. In fact, it evidences that ferri/ferrocyanide is not a classical outer-sphere redox probe. On the other hand, the PDAC/RGO film has an inverse and positive effect on dopamine and 1,4naphtoquinone redox reactions. Further, impedance spectroscopy data reveal that the PDAC/RGO film reduces by about 9 orders of magnitude the charge transfer resistance with these organic redox couples. As a main conclusion of the study, it is found that the right matching between RGO energy levels and the reduction potential of the redox species is not enough to provide electrocatalytic activity. The surface chemistry of RGO-based electrode plays an equivalent role for the electrodes' response.

show abstract

Reduced graphene oxide multilayers for gas and liquid phases chemical sensing

Cited by 38 publications

References 36 publications

Experimental and computational investigation of reduced graphene oxide nanoplatelets stabilized in poly(styrene sulfonate) sodium salt

Experimental and computational investigation of reduced graphene oxide nanoplatelets stabilized in poly(styrene sulfonate) sodium salt

Impedance spectroscopy of single graphene layer at gas adsorption

Electrochemical behaviour of some redox couples at layer-by-layer assembled poly(diallyl dimethylammonium)/reduced graphene oxide electrodes

Contact Info

Product

Resources

About