Wei Shan,Zhengqian Fu,Mingsheng Ma,Zhifu Liu,Zhenggang Xue,Jiaqiang Xu,Faqiang Zhang,Yongxiang Li
Tin(II) monosulfide (SnS) nanosheets were synthesized using SnCl4•5H2O and S powders as raw materials in the presence of H2O via a facile chemical bath method. Orthorhombic phase SnS nanosheets with a thickness of ~100 nm and lateral dimensions of 2~10 μm were obtained by controlling the synthesis parameters. The formation of a SnO2intermediate is key to the valence reduction of Sn ions (from IV to II) and the formation of SnS. The gas sensors fabricated from SnS nanosheets exhibited an excellent response of 14.86 to 100 ppm ethanol vapor when operating at 160 °C, as well as fast response and recovery times of 23 s and 26 s, respectively. The sensors showed excellent selectivity for the detection of ethanol over acetone, methanol, and ammonia gases, which indicates the SnS nanosheets are promising for high-performance ethanol gas sensing applications.Keywords:gas sensors;SnS nanosheets;chemical bath synthesis;oleylamine;ethanol sensing
Epinephrine (EP) is a catecholamine neurotransmitter produced from l -tyrosine (L-TY), which usually coexists with each other in biological fluids. Moreover, their abnormal concentrations are related to multiple diseases, so sensitive simultaneous determination of EP and l -TY is important. Herein, we delicately designed 3D SnS@Co ,N- C hierarchical hollow microrod assembled from 2D SnS nanoplates vertically anchored on the MOF derived cobalt, nitrogen co-doped carbon rod (Co ,N- C) as electrode materials using one-step hydrothermal method, followed by thermal annealing in N 2 , and accompanying sequential phase transformation (2D SnS 2 nanoplates in-situ reduced to SnS phase). Obtained hierarchical hollow carbon microrod with beneficial heteroatom doped not only provided sufficient electroactive sites, but also increased the conductivity of the materials. As-fabricated strongly coupled 3D SnS@Co ,N- C microrod displayed enhanced electrochemical performance, offering highly sensitive sensing responses toward biomolecules EP and L-TY. Differential pulse voltammetry (DPV) study indicated that the sensor offered wide linear ranges of 0.01–300.0 and 0.01–250.0 μmol/L, and low detection limits of 3.3 and 3.1 nmol/L for EP and L-TY respectively. The constructed sensor was successfully applied to monitor simultaneously EP and L-TY in milk, human urine and serum samples with high accuracy and reliability.
An alkali-treated MXene-SnS hybrid was prepared through hydrothermal methods. The Alk-MXene microplates provide highway for electronic transport, and the 3D wrinkled morphology ensures sufficient channels for Li + diffusion. The alkali treatment of MXene gives Alk-MXene@SnS enhanced binding strength, which allows the SnS nanosheets to remain firm binding with the Alk-MXene substrate during cycling and overcome capacity decay caused by large volume change. The synergy between the two components guarantees the hybrid excellent electrochemical properties by enabling high electronic/ionic conductivity and superior kinetic properties as evidenced by EIS, GITT tests and DFT calculation. As a result, the Alk-MXene@SnS retains specific capacities of 519 mAh/g after 100 cycles at 200 mA g −1 , and 330 mAh/g at the high rate of 8000 mA g −1 . In addition, a reversible capacity of 421 mAh/g can be provided after long term cycle test at 1000 mA g −1 for 800 cycles.
危险品化学品经营许可证（带存储）