Homogenous Dispersion of MoS₂ Nanosheets in Polyindole Matrix at Air–Water Interface Assisted by Langmuir Technique

Abstract

Two-dimensional (2D) inorganic layered materials when embedded in organic polymer matrix exhibit exotic properties that are grabbing contemporary attention for various applications. Here, nanosheet morphology of molybdenum disufide (MoS) synthesized via one-pot facile hydrothermal reaction are exfoliated in benign aqueous medium in the presence of indole to obtain a stable dispersion. These exfoliated nanosheets then act as host to template the controlled polymerization of indole. The preassembled MoS-polyindole (MoS-PIn) nanostructures are reorganized at the air-water interface using the Langmuir method to facilitate maximum interfacial interaction between nanosheet and polymer. This report emphasizes large area, homogeneous dispersion of uniform-sized MoS nanosheets (40-60 nm diameter) in the PIn matrix and the formation of stable and uniform film via the Langmuir-Schaefer (LS) method. These self-assembled, MoS decorated PIn LS films are characterized using atomic force microscopy (AFM) and transmission electron microscopy (TEM). The fabricated LS films in sandwiched structure Al/MoS-PIn/ITO as the Schottky diode portrayed remarkable enhancements in charge transport properties. Our study illustrates the potential of the MoS-PIn LS film in electronic applications and opens a new dimension for uniform dispersion of 2D materials in other polymers via the Langmuir method for device fabrication and enhancement of electrical properties.

Preparation and Characterization of a Novel Activated Carbon@Polyindole Composite for the Effective Removal of Ionic Dye from Water

“…Peaks at 254 nm originates from n-π* transition, whereas peaks positioned at 325 nm and 388 nm are due to the π-π* transition. Moreover, absorption peak at 428 nm and 505 nm arises due to polaronic transition in PIN [ 41 , 42 ]. Compared to indole UV-Vis spectrum as in the literature, the presence of more peaks with their shift towards the longer wavelength (bathochromic shift) in the spectra of PIN provides the evidence of higher extent of π-electronic conjugation in polymer.…”

Unique supramolecular assembly through Langmuir – Blodgett (LB) technique

“…Lots of efforts have been given to investigate different kinds of molecular aggregate formed onto LB films [37, 38, 39, 40, 41]. It has been shown that this technique is very suitable for preparation of different supramolecular aggregates, where the properties of such aggregates can be tuned by optimizing various parameters during film formation [83, 84].…”

Nonlinear Optical Response of Graphene Oxide Langmuir-Blodgett Film as Saturable Absorbers

“…The Langmuir-Blodgett (LB) technique has been widely used for nearly a century to deposit large-area molecular and particular monolayers onto a variety of substrates [28,29]. In addition, the LB technique has been used to obtain solid films of molybdenum disulfide (MoS 2 ) [30], and metal nanoparticles [20,31]. However, surface roughness of these films affects their optical properties [32,33].…”