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By adjusting the pore size of the porous anodic alumina (AAO) template, electron beam evaporation was used to evaporate silver on the surface of the AAO template. Then gold was deposited to obtain the surface-enhanced Raman (SERS) substrate with an Au@Ag structure. The characterisics of samples were characterized by scanning electron microscopy (SEM), X-ray diffractometry (XRD), UV-visible absorption spectroscopy (UV-Vis), and Raman spectroscopy. The results show that the sample presents a reticulate mccro-nano Au@ Ag structure, and the substrate shows the highest enhancement ability. When it was used for the residue identification of Rhodamine 6G (R6G) soluion, SERS detects that the residual concentraion of R6G can be as low as 10-12 mol/L. The experimental method with simple operation, low cost, and high-yield can provide a possible soluiion for preparing highly sensitive and highly stable SERS substrates. [ABSTRACT FROM AUTHOR]

The exploration of the superconducting properties of antiferromagnetic parent compounds containing transition metals under pressure provides a unique idea for finding and designing superconducting materials with better performance. In this paper, the close relationship between the possible superconductivity and structure phase transition of the typical van der Waals layered material 1 T -CrSe 2 induced by pressure is studied by means of electrical transport and x-ray diffraction for the first time. We introduce the possibility of pressure-induced superconductivity at 20 GPa, with a critical T c of approximately at 4 K. The superconductivity persists up to the highest measured pressure of 70 GPa, with a maximum T c ∼ 5 K at 24 GPa. We observed a structure phase transition from P -3 m 1 to C 2/ m space group in the range of 9.4-11.7 GPa. The results show that the structural phase transition leads to the metallization of 1 T -CrSe 2 and the further pressure effect makes the superconductivity appear in the new structure. The material undergoes a transition from a two-dimensional layered structure to a three-dimensional structure under pressure. This is the first time that possible superconductivity has been observed in 1 T -CrSe 2 ., (© 2024 IOP Publishing Ltd.)