Recent advances in MoS₂-based nanomaterial sensors for room-temperature gas detection: a review

Abstract

Two-dimensional (2D) material of MoS2 has attracted great attention in developing room temperature gas sensors in recent years due to its large specific surface area, ultra-high carrier mobility, strong surface...

Sensitivity Enhancement of CO2 Sensors at Room Temperature Based on the CZO Nanorod Architecture

“…Physisorption does not result in electronic structures or electron transitions, as no chemical bonds occur. However, there is a uniform upward shift in the work function of the sensing layer, ranging from Φ S1 to Φ S2 by a specific value . It is noteworthy that within this investigation, two observed phenomena substantiate the binary nature of the sensory properties: physisorption and chemisorption, as confirmed by experimental data (see Figure S4, Supporting Information).…”

Facile synthesis and effect of thermal treatment on MoO3−x@MoS2 (x = 0, 1) bilayer nanostructure: toward photoelectrochemical applications

“…The Mo:S atomic ratios were approximately 1.0:1.0, 1.0:1.0, and 1.0:1.7 for S0-1, S0-2, and S0-3 samples, respectively. After thermal treatment, the values dramatically increased to 1:2.5 for the S300-1 sample and decreased by 1.4:1.0 and 1.2:1.0 for the S300-2 and S300-3 samples, respectively [6,30]. The atomic percentage of O significantly increased from 1.39% to 41.36% for the S0-1 and S0-3 samples, respectively, and decreased to 7.61% for the S0-2 samples.…”

“…The excessive sulfur led to a mixture of phases (crystalline and amorphous regions) and a disorder of the MoS 2 structure. To verify the oxidation state, atomic bonding energy, vacancies, and formation of some surface oxides, the X-ray photoelectron spectroscopy (XPS) spectrum is suggested for MoO 3-x @MoS 2 samples [6,14,38,69]. However, within the scope of this study, we utilized the XRD pattern, Raman, and EDS spectra investigation instead.…”

“…Upon illumination and applied potential, the photogenerated electron-hole pairs in the MoO 3-x /MoS 2 active layer are proposed to be separated. Subsequently, the electron is transferred to the Pt counter electrode via the FTO surface and external circuit to participate in the water reduction reaction to generate H 2 , according to equation (6). Simultaneously, the holes diffuse to the surface of the MoO 3-x @MoS 2 working electrode to participate in the water oxidation reaction to generate O 2 , following equation (7).…”

“…In recent years, molybdenum sulfide (MoS 2 ), a metal dichalcogenide, has emerged as a versatile material for diverse applications, including photodetector [1][2][3], light-emitting diode [4,5], gas sensor [6][7][8], supercapacitor [9,10], field effect transistor [11,12], photoelectrochemical or hydrogen evolution reaction (HER) [13][14][15][16][17][18][19], photocatalysis [20], Li-battery [21,22], and environmental treatment [23,24]. The two-dimensional (2D) MoS 2 nanoflake structure exhibits a pseudo-quantum confinement effect, which gives rise to superior properties such as high carrier mobility, fast photoexcited electron-hole pair separation/transfer, adjustable energy bandgap, and robust thermal stability [1,7,[25][26][27].…”