Alcohols Assisted Hydrothermal Synthesis of Defect‐Rich MoS₂ and Their Applications in Humidity Sensing

Abstract

The influence of different alcohols on hydrothermal synthesis of molybdenum disulfide (MoS2) has been studied. X‐ray diffraction and scanning electron microscope results show that MoS2 synthesized in water and water/polyethylene glycol exhibits good flower‐like crystallization while in ethanol/water, ethylene glycol/water, and glycerol/water, the MoS2 shows a smaller size of 3D flower structure and larger layer distance. Strong absorbance peaks in Fourier‐transform infrared spectroscopy and Raman spectra indicate oxygen doping in MoS2. These defects from oxygen doping induce a good sensitivity to water vapor in the environment. A lower hydrothermal temperature (i.e., 180 and 200 °C) results in these defect rich MoS2 and benefits the humidity sensing performance.

One-Step Hydrothermal Synthesis of Phase-Engineered MoS2/MoO3 Electrocatalysts for Hydrogen Evolution Reaction

“…Taking into account the most intense (002) peak, the estimated interlayer d -spacing of the hydrothermally synthesized samples was found to be close (∼0.625 nm for M7.0 and M240) or slightly larger (∼0.66 nm for M2.5 and M200) to that of bulk MoS 2 (∼0.615 nm) . Apparently, in the reported literature, the increment in the interlayer spacing is much larger and has often been attributed to the intercalation of ammonia or ammonium ions (NH 4 + ) into the adjacent MoS 2 layers. , However, in our synthesis method, the intercalation of NH 3 or NH 4 + could not be evidenced by the appearance of any distinctive peaks in the N 1s spectra of the samples (Figure S6).…”

High-Yield Production of Few-Layer Graphene via New-fashioned Strategy Combining Resonance Ball Milling and Hydrothermal Exfoliation

“…Hydrothermal treatment is a thermo-chemical conversion technique resulting in efficient hydrolysis and pyrolysis with high temperature and high pressure [36,37]. During the hydrothermal process, the original layered structural materials can be exfoliated into few-layer materials by thermo-chemical intercalation, which provides an important method for the preparation of low-dimensional materials [36][37][38][39][40]. In 2014, Liu et al proposed that single-or few-layer graphene is produced by hydrothermal exfoliation of graphite [41].…”

Flexible Smart Noncontact Control Systems with Ultrasensitive Humidity Sensors

“…In this case, a noncontact humidity sensor can be a noteworthy candidate to the existing sensors. [15][16][17][18][19][20] Compared to the direct contact sensors, the humidity sensor can be controlled in a noncontact way through the humidity changes, thus avoiding the mechanical touch and bacteria transmission. Importantly, moisture is distributed on all humid surfaces such as fingers, thus the humidity sensor can effectively utilize the human body's sweat as an information source to realize long-range and noncontact control, which would be a novel control approach in advanced HMI interface.So far, a variety of sensing materials, such as graphene oxide (GO), [20][21][22][23] carbon nanotubes, [24,25] 2D materials, [19,[26][27][28] and porous membrane [29,30] have been studied for the use in humidity sensors, but there still exists some limitations in terms of stability and performance.…”

“…In this case, a noncontact humidity sensor can be a noteworthy candidate to the existing sensors. [15][16][17][18][19][20] Compared to the direct contact sensors, the humidity sensor can be controlled in a noncontact way through the humidity changes, thus avoiding the mechanical touch and bacteria transmission. Importantly, moisture is distributed on all humid surfaces such as fingers, thus the humidity sensor can effectively utilize the human body's sweat as an information source to realize long-range and noncontact control, which would be a novel control approach in advanced HMI interface.…”

“…So far, a variety of sensing materials, such as graphene oxide (GO), [20][21][22][23] carbon nanotubes, [24,25] 2D materials, [19,[26][27][28] and porous membrane [29,30] have been studied for the use in humidity sensors, but there still exists some limitations in terms of stability and performance. Besides, relatively few sensor arrays for real applications have been developed.…”