Decoration of WS<sub>2</sub> Nanotubes and Fullerene-Like MoS<sub>2</sub> with Gold Nanoparticles

Polyakov, Alexander Yu.; Yadgarov, Lena; Popovitz‐Biro, Ronit; Лебедев, В. А.; Pinkas, Iddo; Rosentsveig, Rita; Feldman, Yishay; Goldt, Anastasia E.; Goodilin, Eugene A.; Tenne, Reshef

doi:10.1021/jp407388h

Cited by 60 publications

(66 citation statements)

References 68 publications

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“…1(d)). The same behavior was previously observed for gold nanoparticles grown on NT-WS 2 [32]. The local composition of the Ag-NT-WS 2 nanocomposite prepared using AgNO 3 was also visualized using STEM-EDX mapping (Fig.…”

Section: Resultssupporting

confidence: 75%

“…On the contrary, the functionalization of NT-WS 2 with plasmonic silver nanoparticles has not been studied yet, despite several attempts having been made to synthesize Au-NT-WS 2 nanocomposites [31][32][33][34]. Moreover, it was suggested in our previous work [32], which focused on the functionalization of NT-WS 2 with AuNPs via spontaneous HAuCl 4 reduction on the disulfide surface, that the same technique could be applied using AgNO 3 solutions for the production of Ag-NT-WS 2 nanocomposites.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Two facile routes for functionalization of WS2 nanotubes with silver nanoparticles

Polyakov¹,

Лебедев²,

Yadgarov³

et al. 2017

Nanosystems: Phys. Chem. Math.

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Silver-coated WS 2 nanotubes (NT-WS 2 ) were successfully synthesized via two wet chemistry techniques. The first employs spontaneous silver nanoparticle growth resulting from an interaction of disulfide nanotubes with AgNO 3 in aqueous suspensions at 100• C without any additional reducing agents or stabilizers. The second utilizes [Ag(NH 3 ) 2 ]OH complex to produce silver nanoparticles upon thermal decomposition. Both techniques are capable of producing Ag-NT-WS 2 nanocomposites containing 5-60 nm silver nanoparticles tightly attached to the nanotubes' surfaces. The hexagonal arrangement of sulfur atoms of the outer WS 2 layer was postulated to facilitate crystallization of silver nanocrystals with hexagonal crystallographic system (4H-Ag). The physical-chemical model for spontaneous AgNP formation is proposed.

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Section: Resultssupporting

confidence: 75%

Section: Introductionmentioning

confidence: 99%

Two facile routes for functionalization of WS2 nanotubes with silver nanoparticles

Polyakov¹,

Лебедев²,

Yadgarov³

et al. 2017

Nanosystems: Phys. Chem. Math.

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show abstract

“…262 A mechanism involving the oxidation of the molybdenum or tungsten atoms from +IV to +VI has been proposed in the case of WS2 nanotubes and fullerene-like MoS2. 263 Metal deposition on TMDCs monolayers can be controlled by a careful choice of the reducing agents, capping molecules and nature of both the nanosheet and the metal itself to induce an epitaxial growth of the metallic structure on top of the monolayer. 260 More complex phenomena have been recently observed on these TMDC/metal systems, leading to the formation of gold nanowires on MoS2 surfaces 264 , or to the synthesis of TMDC hybrid nanobelts (MoS2, TaS2, TiS2, WSe2 or TaSe2) decorated with Pt or PtAg alloy nanoparticles.…”

Section: O2 For (I) 0 H (Ii) 6 H and (Iii) 24 H Dark Contrast Dots mentioning

confidence: 99%

Two-Dimensional Colloidal Nanocrystals

et al. 2016

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Abstract:In this paper, we review recent progresses on colloidal growth of 2D nanocrystals.We identify four main sources of anisotropy which lead to the formation of plate-and sheetlike colloidal nanomaterials. Defect induced anisotropy is a growth method which relies on the presence of topological defects at the nanoscale to induce 2D shapes objects. Such a method is particularly important in the growth of metallic nanoobjects. Another way to induce anisotropy is based on ligand engineering. The availability of some nanocrystal facets can be tuned by selectively covering the surface with ligands of tunable thickness. Cadmium chalcogenides nanoplatelets (NPLs) strongly rely on this method which offers atomic control in the thinner direction, down to a few monolayers. 2D objects can also be obtained by post or in situ self-assembly of nanocrystals. This growth method differs from the previous ones in the sense that the elementary objects are not molecular precursors, and is a common method for lead chalcogenide compounds. Finally, anisotropy may simply rely on the lattice anisotropy itself as it is common for rod-like nanocrystals. Colloidally grown Transition Metal DiChalcogenides (TMDC) in particular result from such process. We also present hybrid syntheses which combine several of the previously described methods and other paths, such as cation exchange, which expand the range of available materials. Finally, we discuss in which sense 2D-objects differ from 0D nanocrystals and review some of their applications in optoelectronics, including lasing and photodetection, and biology.

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“…The gold NPs (AuNPs) are among the most intensively studied and applied groups of novel nanomaterials due to their aforementioned properties [20e24]. Pioneering works to anchor or decorate gold NPs to LTMD as well as inorganic nanotubes or fullerenes (INTs or IFs) showed that the NPs could be selectively seated on MoS 2 surfaces through non-covalent bonds [18] or chemical bonds [19,25]. Although growth mechanisms are different, rather small-sized NPs have been reported.…”

Section: Introductionmentioning

confidence: 99%