Bulk Fabrication of WS₂ Nanoplates: Investigation on the Morphology Evolution and Electrochemical Performance

Two-dimensional layered chalcogenide WS₂, similar to graphene, is considered to be very interesting for materials scientists. However, to make it a useful material platform, it is necessary to develop sophisticated synthesis methods to control its morphology. In this paper, we present a simple approach to prepare various morphologies of WS₂ nanostructures by direct thermal evaporation of WO₃ and S powders onto Si substrates sputtered with W film without using any nanostructured W-contained precursors and highly toxic sulfide gases. This method can produce bulk quantities of pure hexagonal, horizontally grown WS₂ nanoplates, vertically grown nanoplates, and nanoplate-formed flowers simply by tuning the distance between the substrate and source powders. The synthesis mechanism and morphology evolution model were proposed. Moreover, when employed as a thin-film anode material, the Li-ion battery with as-prepared, vertically grown WS₂ nanoplates presented a rechargeable performance between 3 and 0.01 V with a discharge capacity of about 773 mAh/cm³ after recycling three times, much better than its already-reported counterparts with randomly distributed WS₂ nanosheet electrodes, but the battery with horizontally grown WS₂ nanoplates could not show any charge–discharge cycling property, which could be attributed to the different structures of WS₂ anodes for Li⁺ ion intercalation or deintercalation

φC31 -Mediated Cassette Exchange in Sf9 Insect Cells for Stable Expression

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PEGylated Self-Growth MoS₂ on a Cotton Cloth Substrate for High-Efficiency Solar Energy Utilization

Solar steam generation, utilizing abundant solar energy and floating photothermal materials, has been considered as one of the most sustainable, efficient ways to solve the problem of water shortage. Here, a new system for solar steam generation is fabricated based on a PEGylated MoS₂-cotton cloth (PMoS₂-CC). 80.5–90 ± 3.5% of high-efficiency solar steam generation is achieved under a light density of 1–5 kW m^–2 because of the good gas permeability of CC and the hydrophilic property of PMoS₂-CC. The self-growth PMoS₂-CC provides good photothermal performances in pure water and saline water. The water evaporation rate with PMoS₂-CC keeps a stable value after a long-time illumination (4 h) and 32 times cycle tests. Our result provides a way to prepare pure water in the applications for alleviating a scarcity of drinking water

Aptamer-Based Solution-Gated Graphene Transistors for Highly Sensitive and Real-Time Detection of Thrombin Molecules

Thrombin is an important biomarker for various diseases and biochemical reactions. Rapid and real-time detection of thrombin that quickly neutralizes in early coagulation in the body has gained significant attention for its practical applications. Solution-gated graphene transistors (SGGTs) have been widely studied due to their higher sensitivity and low-cost fabrication for chemical and biological sensing applications. In this paper, the ssDNA aptamer with 29 bases was immobilized on the surface of the gate electrode to specifically recognize thrombin. The SGGT sensor achieved high sensitivity with a limit of detection (LOD) up to fM. The LOD was attributed to the amplification function of SGGTs and the suitable aptamer choice. The ssDNA configuration folding induced by thrombin molecules and the electropositivity of thrombin molecules could arouse the same electrical response of SGGTs, helping the device obtain a high sensitivity. The channel current variation of sensors had a good linear relationship with the logarithm of thrombin concentration in the range of 1 fM to 10 nM. The fabricated device also demonstrated a short response time to thrombin molecules, and the response time to the 1 fM thrombin molecules was about 150 s. In summary, the sensing strategy of aptamer-based SGGTs with high sensitivity and high selectivity has a good prospect in medical diagnosis