Preparation of polyvinyl alcohol/two‐dimensional transition metal dichalcogenides composites by high‐pressure homogenization

Abstract

In this article, water-soluble polymer polyvinyl alcohol solution was used to exfoliate the graphene-like two-dimensional materials (MoS 2 and WS 2 ). The concentrations of the two disulfide nanosheets were 0.092 and 0.087 mg/mL in the 10% aqueous solution of PVA. UV-Vis and Raman spectrum demonstrated that the two dispersions were the few layer nanosheets in the solution. Then, taking the exfoliated WS 2 as filler, a series of PVA/WS 2 composites showing the pale yellow transparent films were prepared by solution process method. Composite films showed good thermal performance. When 1 wt% were added in the PVA matrix, the T 90% improved 44 C in the air. Furthermore, the three kinds of characteristic temperature of T 10% , T 50% , and T 90% had obvious increase in the N 2 . The main reason may be the physical barrier of the 2D nanosheets and the strong interaction force of the S atom of exfoliated 2D nanosheets. The composites could slow the thermal decomposition.

Photocurrent conversion capability of a 2D WS2-polyvinyl alcohol matrix and its DFT-based charge carrier dynamics analysis

“…These exposed S atoms produced a strong contact with the PVOH molecular chain, delaying the thermal breakdown of the composite material. 66 In the metallopolymeric system, there is contact between them because the W atom is in the WS 2 and the –OH functional group is in the PVOH matrix. There are certain electronic parameters, such as HOMO–LUMO gap (Δ E ), electron affinity (EA), ionization potential (IP), electronegativity ( μ ), chemical potential ( χ ), chemical hardness ( η ), chemical softness ( σ ), and nucleophilicity index ( ω ), which can be calculated by relations (17)–(24), 67–69 to investigate the properties of the metallopolymeric system as presented in Table 3.…”

“…11. Ning Xu et al 66 also showed that the metallopolymer of WS 2 PVOH looks yellowish green, and is smooth with no obvious defects and excellent transparency. Certain S bare atoms that appeared at the edges of the nanosheets and could easily interact increased the force between PVOH and WS 2 .…”

High Pressure Homogenization – An Update on its Usage and Understanding

“…Correspondingly, HPH is suitable for use to directly produce a wide variety of dispersions and has been demonstrated as an effective technique for dispersing and potentially modifying nanomaterials (Azoubel and Magdassi, 2010;Li et al, 2019;Schlüter et al, 2014;Tölle et al, 2012). Many studies have reported successful use of HPH as a processing step to produce advanced materials such as graphene films and inks (Tölle et al, 2012), polymer composites incorporating nanomaterials for improved mechanical, thermal and electrical properties (Appel et al, 2012;Chatterjee et al, 2012;Clausi et al, 2020;Shayganpour et al, 2019;Wu et al, 2021;Xu et al, 2020), and nanofluids which will be discussed. One particularly noteworthy application which has gained significant industrial traction recently, but is comparatively less explored in the academic literature is the production of graphene / carbon nanotube slurries for electrode coatings in batteries (Park et al, 2022;Wen et al, 2023).…”

High Pressure Homogenization – An Update on its Usage and Understanding

“…Correspondingly, HPH is suitable for use to directly produce a wide variety of dispersions and has been demonstrated as an effective technique for dispersing and potentially modifying nanomaterials (Azoubel and Magdassi, 2010;Li et al, 2019;Schlüter et al, 2014;Tölle et al, 2012). Many studies have reported successful use of HPH as a processing step to produce advanced materials such as graphene films and inks (Tölle et al, 2012), polymer composites incorporating nanomaterials for improved mechanical, thermal and electrical properties (Appel et al, 2012;Chatterjee et al, 2012;Clausi et al, 2020;Shayganpour et al, 2019;Wu et al, 2021;Xu et al, 2020), and nanofluids which will be discussed.…”