Abstract:This work demonstrats a convenient and effective approach to synthesize WSe 2 nanorods at only 600 °C in argon atmosphere after ball milling. The friction and wear properties of WSe 2 nanorods as additives in two kinds of base oil, GyT130 oil and 60N oil were systematically investigated. Compared to base oil, the friction coefficient of the base oil containing WSe 2 nanorods was obviously reduced and the wear behaviour was improved. The nanorods in the 60N base oil showed better tribological properties than th… Show more
“…The third is composed of the transition metal chalcogenides, containing MoS 2 , WS 2 , MoSe 2 , WSe 2, etc. [11,12,13,14,15]. The last category comprises other nanomaterials such as oxides, fluorides, and borides [16,17,18,19,20].…”
This paper presents the facile synthesis of two different morphologies of WS2 nanomaterials—WS2 hexagonal nanoplates and nanoflowers—by a sulfurization reaction. The phases and morphology of the samples were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). The tribological performance of the two kinds of WS2 nanomaterials as additives in paraffin oil were measured using a UMT (Universal Mechanical Tester)-2 tribotester. The results demonstrated that the friction and wear performance of paraffin oil can be greatly improved with the addition of WS2 nanomaterials, and that the morphology and content of WS2 nanomaterials have a significant effect on the tribological properties of paraffin oil. The tribological performance of lubricating oil was best when the concentration of the WS2 nanomaterial additive was 0.5 wt %. Moreover, the paraffin oil with added WS2 nanoflowers exhibited better tribological properties than paraffin oil with added WS2 hexagonal nanoplates. The superior tribological properties of WS2 nanoflowers can be attributed to their special morphology, which contributes to the formation of a uniform tribo-film during the sliding process.
“…The third is composed of the transition metal chalcogenides, containing MoS 2 , WS 2 , MoSe 2 , WSe 2, etc. [11,12,13,14,15]. The last category comprises other nanomaterials such as oxides, fluorides, and borides [16,17,18,19,20].…”
This paper presents the facile synthesis of two different morphologies of WS2 nanomaterials—WS2 hexagonal nanoplates and nanoflowers—by a sulfurization reaction. The phases and morphology of the samples were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). The tribological performance of the two kinds of WS2 nanomaterials as additives in paraffin oil were measured using a UMT (Universal Mechanical Tester)-2 tribotester. The results demonstrated that the friction and wear performance of paraffin oil can be greatly improved with the addition of WS2 nanomaterials, and that the morphology and content of WS2 nanomaterials have a significant effect on the tribological properties of paraffin oil. The tribological performance of lubricating oil was best when the concentration of the WS2 nanomaterial additive was 0.5 wt %. Moreover, the paraffin oil with added WS2 nanoflowers exhibited better tribological properties than paraffin oil with added WS2 hexagonal nanoplates. The superior tribological properties of WS2 nanoflowers can be attributed to their special morphology, which contributes to the formation of a uniform tribo-film during the sliding process.
“…Nath et al [37] had prepared WSe 2 nanotubes by H 2 reduction method. Yang et al [38] had prepared WSe 2 nanorods by ball milling. Li et al [39] had prepared WSe 2 nanosheets by solid state method.…”
Graphene-structure WSe nano-films (NFMs) were prepared by magnetron sputtering and vacuum selenization. The as synthesized WSe NFMs were characterized using various techniques such as SEM, XRD and EDS. Our work provides a simple and effective method to prepare WSe NFMs. We have observed the high photo responsivity of WSe2 NFMs up to 10 A W, which is 40% higher than the previously reported data. Our photoelectrochemical tests demonstrate that WSe NFMs have excellent photoelectric properties, indicating that NFMs have a wide application potentialsin solar cells and optoelectronic devices.
“…Thus, stemming from efforts to engineer graphene with a bandgap, 2D TMDC materials with a bandgap similar to that of silicon have recently been developed. TMDC materials are well known for their applications in solid state lubricants [22,23], photovoltaic devices [24,25], and rechargeable batteries [26,27]. The 2D TMDC materials are generally composed of few-atom-polyhedral layers with transition metal atoms (mainly Mo and W) sandwiched between two layers of chalcogen atoms (typically S, Se, or Te) and MX 2 stoichiometry (Figure 3a) [28,29].…”
Section: Mos 2 (A 2d Transition Metal Dichalcogenide Material)mentioning
The use of graphene and two-dimensional materials for industrial, scientific, and medical applications has recently received an enormous amount of attention due to their exceptional physicochemical properties. There have been numerous efforts to incorporate these two-dimensional materials into advanced flexible electronics, especially aimed for wearable biomedical applications. Here, recent advances in two-dimensional materials-based flexible electronic sensors for wearable biomedical applications with regard to both materials and devices are presented.
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