Synthesis and characterization of MoS ₂ / WO ₃ nanocomposite for electrochromic device application

Abstract

In this work, WO 3 nanopowder was synthesized by an acidic co-precipitation method using sodium tungstate, nitric acid, and distilled water as precursors, while molybdenum disulfide (MoS 2 )/tungsten trioxide (WO 3 ) nanocomposite was prepared by exfoliation of MoS 2 in WO 3 at different concentrations of MoS 2 on WO 3 . All materials were analysed for their structural characteristics using X-ray diffraction (XRD) spectra. The XRD spectra confirm the formation of prepared samples. The morphology of the nanocomposites was investigated by field emission scanning electron microscopy (FESEM) and high-resolution transmission electron microscopy (HRTEM). FESEM and HRTEM show that the addition of 2% MoS 2 has an insignificant effect on the morphology of WO 3 but when the MoS 2 concentration is increased to 4%, the particles' edges agglomerate and combine to create layered nanostructures that resemble flowers and join together to form a sphere. The electrochemical performance of all prepared samples was investigated using charge/discharge, chronoamperometry, and cyclic voltammetry. The electrochemical test results show that the electrochemical properties increase after the addition of MoS 2 in WO 3 due to the large active surface area. At ±1.5 V operating voltage, The electrochromic and optical properties of the prepared thin films were investigated using UV/Vis spectroscopy. The MSW2 nanocomposite exhibits the highest optical transmittance of 84% in the bleached state and 25% in the coloured state with a colouration efficiency of 67 cm 2 C À1 . The MSW2 nanocomposite retains a 97% colouration efficiency after 100 cycles. The electrochromic studies show that MoS 2 /WO 3 nanocomposites exhibit good results at low MoS 2 contents (ie, up to 2%). When the proportion of MoS 2 in WO 3 is increased (above 2%), the electrochromic performance decreases due to the deterioration of the transmittance (T%) of the nanocomposite.

Tungsten Disulfide Wrapped WO3 Based Thin Film Transparent Electrode Material for Electrochromic Device Application

“…The EC materials for ECDs are transition metal oxides, such as cobalt oxide (Co 3 O 4 ), copper oxide (CuO), manganese oxide, nickel oxide (NiO), titanium dioxide (TiO 2 ), tin oxide (SnO 2 ), and tungsten oxide (WO 3 ), [10][11][12][13][14][15] where WO 3 is recognized as a remarkable EC material. 16 However, due to their limitations, such as low stability and long switching times, they have not been used for many largescale applications. 17,18 Despite excellent optical properties and high efficiency, amorphous WO 3 still has long response time, poor electrochromic repeatability, and instability.…”

Plasmonics Stimulated Enhanced Performance MoS2/WO3 Heterojunction Based Broadband Self-Powered Photodetector

“…MoS 2 , as a semiconducting 2D material, offers a unique combination of excellent electrical and optical properties, rendering it an appealing choice for photodetection applications. On the other hand, WO 3 , known for its semiconducting nature and wide bandgap, complements MoS 2 by facilitating the efficient separation of photogenerated charge carriers and ensuring broad-spectrum light absorption . The n–n type heterojunction between MoS 2 and WO 3 in photosensors is crucial for efficient electron transport and enhanced photogenerated carrier collection.…”

Enhanced Acetone Sensing Based on Group-11 Metal (Cu, Ag, and Au) Nanoparticles Embedded in Graphitic Carbon Nitride (gCN)

“…Moreover, acetone is classified as a carcinogen by the US Environmental Protection Agency [6], and it also causes infertility in male as well as female animals [7]. Acetone can also act as a breath marker for the noninvasive and rapid detection of diabetes [8,9]. Thus, the detection of acetone is vital from a health and safety point of view.…”

“…The incorporation of transition metals into gCN can trap the electrons, thus prolonging the electron-hole recombination rate, making electrons available on the surface to interact more efficiently with the analyte [35]. Moreover, the localized surface plasmon resonance due to these noble metals can further support the interaction process between the sensor material and the analyte [8]. The electrical conductivity can also be enhanced by incorporating the transition metals in gCN, making it an efficient sensing material near room temperature [9].…”