Synthesis of graphene-coated carbon nanotubes-supported metal nanoparticles as multifunctional hybrid materials

Gallego, Jaime; Tapia, Juan; Vargas, Merlyn; Santamarı́a, Alexander; Orozco, Jahir; López, Diana

doi:10.1016/j.carbon.2016.10.014

Cited by 22 publications

(14 citation statements)

References 34 publications

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“…The hybrid material based on MWCNT decorated with Fe and coated with graphene was synthetized according with an already reported procedure , and the morphology was studied herein by using TEM. Figure shows TEM micrographs of the resultant hybrid material.…”

Section: Resultsmentioning

confidence: 99%

“…Unlike MWCNT‐embedded Fe nanoparticles commonly reported, in our hybrid material, the Fe nanoparticles are decorating the MWCNT surface, being more exposed, thereby favoring the Fe catalytic activity and the faster electrochemical response of the hybrid material. The metallic nanoparticles were well‐wrapped within the graphene thin sheets, from the intrinsic impregnation‐reduction‐decoration fabrication process . The graphene coating surface seems to be rougher than the bare MWCNT, which is related with the curling and corrugated graphene sheets.…”

Section: Resultsmentioning

confidence: 99%

“…The hybrid was rationally designed and fabricated by accommodating the different materials, in a sequential and controlled manner as follow. MWCNT were obtained through an ethanol decomposition reaction process at 900 °C in presence of perovskites (LaFeO 3 ) as catalyst precursors . The catalyst was placed into a horizontal reactor; temperature was raised at 10 °C⋅min −1 under N 2 atmosphere until the desired reaction temperature, for 4 h. The MWCNT obtained were treated with 65 % HNO 3 and 96 % H 2 SO 4 (3 : 1), for 15 min at 130 °C, by applying a power of 500 W in a Milestone MicroSYNTH microwave.…”

Section: Methodsmentioning

confidence: 99%

“…The treated MWCNTs were decorated with iron nanoparticles (Fe‐MWCNT) through the metal impregnation method as previously reported . Briefly, carbon nanotubes were dispersed into an iron nitrate solution to obtain a nominal mass fraction of 10 % of Fe, over MWCNT, using an ultrasound bath.…”

Section: Methodsmentioning

confidence: 99%

“…Among CNM, carbon nanotubes (CNT) and graphene are nanomaterials widely explored in the development of nanobioengineered platforms because of their unique structural and physicochemical properties . For example, multi‐walled carbon nanotubes (MWCNT) have been broadly interrogated for chemical and biological sensing applications .…”

Section: Introductionmentioning

confidence: 99%

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Electroanalysis of an Iron@Graphene‐Carbon Nanotube Hybrid Material

et al. 2018

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Hybrid nanomaterials have outstanding properties that are superior to the corresponding constituents working alone. This work reports on the electroanalysis of a hybrid material‐decorated screen‐printed carbon electrode (SPCE) that consists of iron nanoparticles supported at multi‐wall carbon nanotubes (MWCNT), coated with graphene layers, named Fe@G‐MWCNT. Electrochemical and morphological characterizations were carried out by cyclic voltammetry, electrochemical impedance spectroscopy and high‐resolution transmission electron microscopy, respectively. After optimizing the amount of hybrid material to be drop casted at the SPCE, its electrochemical activation in sulphuric acid produced an enhanced response. The resultant electrochemically reduced Fe@G‐MWCNT‐e‐modified electrode exhibited a diffusion‐controlled redox process with an enhanced heterogeneous electron‐transfer rate constant of 3.21×10−2 cm⋅s−1, which was superior to that from the MWCNT counterpart. However, it was slightly lower than that from a Fe‐MWCNT‐decorated electrode. The graphene coating limited slightly the electron‐transfer process, but works as a protective layer that prevent the loss of Fe catalytic activity. The electrochemical response of the hybrid with graphene coated Fe decreased only a 24.3 % after one week, respect to 51.9 % of the uncoated one. In addition, the hybrid material‐modified electrode exhibited electrocatalytic activity towards the reduction of H2O2 in a linear range of 0.5 mM to 9.8 mM, with sensitivity of 7.97 μA⋅mM−1 and LOD of 0.65 mM, thereby opening an avenue for the development of more specific and highly sensitive Fe@G‐MWCNT hybrid‐based (bio) sensors.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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