Multifunctional Nanohybrids by Self-Assembly of Monodisperse Iron Oxide Nanoparticles and Nanolamellar MoS₂ Plates

Abstract

Here, we report the synthesis, characterization, and properties of novel nanohybrids formed by self-assembly of negatively charged MoS 2 nanoplates and positively charged iron oxide nanoparticles (NPs) of two different sizes, 5.1 and 11.6 nm. Iron oxide NPs were functionalized with an amphiphilic random copolymer, quaternized poly(2-(dimethylamino)ethyl metacrylate-co-stearyl metacrylate), synthesized for the first time using atom transfer radical polymerization. The influence of the MoS 2 fraction and the iron oxide NP size on the structure of the nanohybrids has been studied. Surprisingly, larger NPs retained a larger fraction of the copolymer, thus requiring more MoS 2 nanoplates for charge compensation. The nanohybrid based on 11.6 nm NPs was studied in oxidation of sulfide ions. This reaction could be used for removing the dangerous pollutant from wastewater and in the production of hydrogen from water using solar energy. We demonstrated a higher catalytic activity of the NP/MoS 2 nanohybrid than that of merely dispersed MoS 2 in catalytic oxidation of sulfide ions and facile magnetic recovery of the catalyst after the reaction.

A general one-step approach for in situ decoration of MoS2 nanosheets with inorganic nanoparticles

“…It is reported that the oxygen-containing functional groups play a crucial role in controlling the size, morphology and distribution of anchored INPs. [17][18][19][20][21][22] From the perspective of materials design, the decoration of INPs not only suppresses the agglomeration and restacking of MoS 2 nanosheets that may result in the loss of the unique layer-dependent properties but also endows MoS 2 nanosheets with new physical and chemical properties. [8][9][10][11][12] For example, the monolayer MoS 2 is a direct semiconductor and shows an intrinsic bandgap and high mobility as compared with a graphene sheet.…”

“…[8][9][10][11][12] For example, the monolayer MoS 2 is a direct semiconductor and shows an intrinsic bandgap and high mobility as compared with a graphene sheet. 22 To the best of our knowledge, however, only few papers have reported the deposition of INPs onto MoS 2 nanosheets until now as compared with a graphene support. [13][14][15][16] To facilitate these applications, it is oen required to integrate MoS 2 nanosheets with INPs.…”

“…Recent studies show that the MoS 2 nanosheet can be applied effectively in catalysis, optoelectronic devices, and biosensors. [17][18][19][20][21][22][23][24][25] This is not due to the unimportance of this issue, but likely due to the extreme difficulty in the controllable and scalable fabrication of MoS 2 -INP nanohybrids. [17][18][19][20][21][22] From the perspective of materials design, the decoration of INPs not only suppresses the agglomeration and restacking of MoS 2 nanosheets that may result in the loss of the unique layer-dependent properties but also endows MoS 2 nanosheets with new physical and chemical properties.…”

Hydrophilization of CdS nanoparticles using a polymeric coating and their photocatalytic properties

“…6 We carried out the hydrophilization of the iron oxide NPs due to surface functionalization by cationic comb shaped co polymer of 2 (methacryloxy)ethyltrimethylammonium methyl sulfate and stearyl methacrylate (PMEASM), and their aqueous suspensions were used for the preparation of a nanocomposite with negatively charged monolay er dispersions of molybdenum disulfide. 7 The obtained nanocomposite exhibited a higher catalytic activity (by 1.4 times) in the oxidation of sulfide ions than the compo nents of the nanocomposite.…”

Quantum dot encapsulation in virus-like particles with tuneable structural properties and low toxicity

“…12,17,18 In the former case, the guest molecules are entrapped within the cage during capsid assembly via complementary electrostatic interactions, whereas in the latter, the precursor molecules diffuse into the pre-formed cage to form nanocrystals. VLP self-assembly around inorganic 'guests' has been explored for gold nanoparticles, 7,19-22 magnetic cores, [23][24][25][26] and QDs 10,14,16,[27][28][29] among others, which have been discussed in recent reviews. [30][31][32] In this work, we extend the QD encapsulation concept to cowpea chlorotic mottle virus (CCMV)-based protein cages.…”