Structure and catalytic properties of hexagonal molybdenum disulfide nanoplates

Castro-Guerrero, Carlos Fernando; Deepak, Francis Leonard; Ponce, Arturo; Cruz-Reyes, J.; Fuentes-Moyado, Sergio; Galván, D. H.; José–Yacamán, Miguel

doi:10.1039/c1cy00055a

Cited by 37 publications

(33 citation statements)

References 50 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…8 Graphene oxide nanoplatelets were synthesized using a modified Hummers method 27 and nano-hexagonal molybdenum di-sulfite nanoplatelets were synthesized using previously reported method. 28 …”

Section: Methodsmentioning

confidence: 99%

Two-Dimensional Nanostructure-Reinforced Biodegradable Polymeric Nanocomposites for Bone Tissue Engineering

et al. 2013

View full text Add to dashboard Cite

This study investigates the efficacy of two dimensional (2D) carbon and inorganic nanostructures as reinforcing agents of crosslinked composites of the biodegradable and biocompatible polymer polypropylene fumarate (PPF) as a function of nanostructure concentration. PPF composites were reinforced using various 2D nanostructures: single- and multi-walled graphene oxide nanoribbons (SWGONRs, MWGONRs), graphene oxide nanoplatelets (GONPs), and molybdenum di-sulfite nanoplatelets (MSNPs) at 0.01–0.2 weight% concentrations. Cross-linked PPF was used as the baseline control, and PPF composites reinforced with single- or multi-walled carbon nanotubes (SWCNT, MWCNT) were used as positive controls. Compression and flexural testing show a significant enhancement (i.e., compressive modulus = 35–108%, compressive yield strength = 26–93%, flexural modulus = 15–53%, and flexural yield strength = 101–262% greater than the baseline control) in the mechanical properties of the 2D-reinforced PPF nanocomposites. MSNPs nanocomposites consistently showed the highest values among the experimental or control groups in all the mechanical measurements. In general, the inorganic nanoparticle MSNPs showed a better or equivalent mechanical reinforcement compared to carbon nanomaterials, and 2-D nanostructures (GONP, MSNP) are better reinforcing agents compared to 1-D nanostructures (e.g. SWCNTs). The results also indicate that the extent of mechanical reinforcement is closely dependent on the nanostructure morphology and follows the trend nanoplatelets > nanoribbons > nanotubes. Transmission electron microscopy of the cross-linked nanocomposites indicates good dispersion of nanomaterials in the polymer matrix without the use of a surfactant. The sol-fraction analysis showed significant changes in the polymer cross-linking in the presence of MSNP (0.01–0.2 wt %) and higher loading concentrations of GONP and MWGONR (0.1–0.2 wt%). The analysis of surface area and aspect ratio of the nanostructures taken together with the above results indicates differences in nanostructure architecture (2D vs. 1D nanostructures), as well as the chemical compositions (inorganic vs. carbon nanostructures), number of functional groups, and structural defects for the 2D nanostructures maybe key properties that affect the mechanical properties of 2D nanostructure-reinforced PPF nanocomposites, and the reason for the enhanced mechanical properties compared to the controls.

show abstract

Section: Methodsmentioning

confidence: 99%

Two-Dimensional Nanostructure-Reinforced Biodegradable Polymeric Nanocomposites for Bone Tissue Engineering

et al. 2013

View full text Add to dashboard Cite

show abstract

“…MoS 2 nanoplatelets (MSNPs) were synthesized as mentioned previously [24]. Briefly, we added MoO 3 and sulfur to an alumina crucible and placed it in a horizontal tube furnace.…”

Section: Methodsmentioning

confidence: 99%

Interactions of 1D- and 2D-Layered Inorganic Nanoparticles with Fibroblasts and Human Mesenchymal Stem Cells

Rashkow

Talukdar

Lalwani

et al. 2015

Nanomedicine (Lond.)

View full text Add to dashboard Cite

Aim This study investigates the effects of tungsten disulfide nanotubes (WSNTs) and molybdenum disulfide nanoplatelets (MSNPs) on fibroblasts (NIH-3T3) and mesenchymal stem cells (MSCs) to determine safe dosages for potential biomedical applications. Materials & methods Cytotoxicity of MSNPs and WSNTs (5–300 µg/ml) on NIH-3T3 and MSCs was assessed at 6, 12 or 24 h. MSC differentiation to adipocytes and osteoblasts was assessed following treatment for 24 h. Results Only NIH-3T3 cells treated with MSNPs showed dose or time dependent increase in cytotoxicity. Differentiation markers of MSCs in treated groups were unaffected compared with untreated controls. Conclusion MSNPs and WSNTs at concentrations less than 50 µg/ml are potentially safe for treatment of fibroblasts or MSCs for up to 24 h.

show abstract

“…GONPs were synthesized utilizing the modified Hummer’s method (the modified technique allows synthesis of macroscopic quantities of graphene oxide nanoplatelets through additional dispersing and filtration steps compared to the conventional Hummer’s method [37]). MSNPs were synthesized using well established chemical method using molybdenum trioxide and sulfur as starting materials [38]. …”

Section: Methodsmentioning

confidence: 99%

In vitrocytocompatibility of one-dimensional and two-dimensional nanostructure-reinforced biodegradable polymeric nanocomposites

Farshid

Lalwani

Sitharaman

2014

J. Biomed. Mater. Res.

View full text Add to dashboard Cite

This study investigates the in vitro cytocompatibility of one- and two-dimensional (1-D and 2-D) carbon and inorganic nanomaterial reinforced polymeric nanocomposites fabricated using biodegradable polymer poly (propylene fumarate), crosslinking agent N-vinyl pyrrolidone (NVP) and following nanomaterials: single- and multi- walled carbon nanotubes, single- and multi- walled graphene oxide nanoribbons, graphene oxide nanoplatelets, molybdenum disulfide nanoplatelets, or tungsten disulfide nanotubes dispersed between 0.02–0.2 wt% concentrations in the polymer. The extraction media of unreacted components, crosslinked nanocomposites and their degradation products between 1X-100X dilutions were examined for effects on viability and attachment employing two cell lines: NIH3T3 fibroblasts and MC3T3 pre-osteoblasts. The extraction media of unreacted PPF/NVP elicited acute dose-dependent cytotoxicity attributed to leaching of unreacted components into cell culture media. However, extraction media of crosslinked nanocomposites showed no dose dependent adverse effects. Further, all crosslinked nanocomposites showed high viability (78–100%), high cellular attachment (40–55%), and spreading that was confirmed by confocal and scanning electron microscopy. Degradation products of nanocomposites showed a mild dose-dependent cytotoxicity possibly due to acidic degradation components of PPF. In general, compared to PPF control, none of the nanocomposites showed significant differences in cellular response to the unreacted components, crosslinked nanocomposites and their degradation products. The initial minor cytotoxic response and lower cell attachment numbers were observed only for a few nanocomposite groups; these effects were absent at later time points for all PPF nanocomposites. The favorable cytocompatibility results for all the nanocomposites opens avenues for in vivo safety and efficacy studies for bone tissue engineering applications.

show abstract

Structure and catalytic properties of hexagonal molybdenum disulfide nanoplates

Cited by 37 publications

References 50 publications

Two-Dimensional Nanostructure-Reinforced Biodegradable Polymeric Nanocomposites for Bone Tissue Engineering

Two-Dimensional Nanostructure-Reinforced Biodegradable Polymeric Nanocomposites for Bone Tissue Engineering

Interactions of 1D- and 2D-Layered Inorganic Nanoparticles with Fibroblasts and Human Mesenchymal Stem Cells

In vitrocytocompatibility of one-dimensional and two-dimensional nanostructure-reinforced biodegradable polymeric nanocomposites

Contact Info

Product

Resources

About