The combinations of hollow MoS₂ micro@nano-spheres: one-step synthesis, excellent photocatalytic and humidity sensing properties

Abstract

The combinations of hollow MoS 2 micro@nano-spheres were successfully fabricated through a one-step hydrothermal method. A possible growth mechanism was presented in detail based on time-dependent experimental facts. Besides, the photocatalytic activities of the samples were evaluated by monitoring the photodegradation of methylene blue (MB). The adsorption value of 150 mg g À1 shows a strong adsorption capability in the dark. After irradiation for only 30 min, the remaining MB in solution is about 9.7%. Moreover, the humidity sensing properties of the samples were measured for the first time. The results revealed high sensitivity at high RH, small humidity hysteresis, fast response and recovery times, and good stability. The greatest sensitivity is 32.19 nF/% RH and the maximum hysteresis is $6.3% RH.For humidity cycling of 17.2-89.5-17.2% RH, the response and recovery times are $140 s and $80 s, respectively. Capacitance fluctuations for one month are less than AE7% at various relative humidities (RHs).

Optical humidity sensor using methylene blue immobilized on a hydrophilic polymer

“…Since conventional electronic RH sensors are based on picking up the changes in electric conductivity or capacitance [5][6][7][8], electrical-resistance [9,10] and surface acoustic wave types [11], among others [4], there are some difficulties in highly humid conditions. Moreover, an inevitable problem is the fact that the sensor head has to be an electrically powered device.…”

One-step hydrothermal synthesis of flowerlike MoS2/CdS heterostructures for enhanced visible-light photocatalytic activities

“…20,21 Aer the discovery and applications of graphene-based nanomaterials, two-dimensional (2D) layered transition metal dichalcogenide have aroused research interest in industrial and scientic elds because of their unique properties and wide potential applications. Indeed, TiO 2 /MoS 2 and graphene/MoS 2 heterostructures have been prepared, [33][34][35] but few researches study the photocatalytic degradation activities of CdS/MoS 2 hybrids constructed by a one-pot process. [25][26][27][28] Therefore, a great deal of efforts have been devoted to the MoS 2 studies.…”

Ionic liquid assisted hydrothermal synthesis of MoS2 double-shell polyhedral cages with enhanced catalytic hydrogenation activities

“…22,23 Up to now, spherical or quasi-spherical MoS 2 hollow particles have been easily synthesized since the interface energy of sphere is relatively low. [24][25][26][27][28] Recently, nonspherical MoS 2 hollow cages have been constructed successfully. Xie and co-workers prepared MoS 2 hierarchical hollow cubic cages assembled by bilayers via a one-step self-assembly process.…”