Ultrasensitive SERS Detection of Trinitrotoluene through Capillarity-constructed Reversible Hot Spots based on ZnO-Ag Nanorods Hybrids

a Instruments The as-prepared nanostructures on the substrate were sent to characterizations on a CAMSCAN APOLLO 300 field-emission scanning electron microscopy (FE-SEM) at 15KV. The crystal structure of the products was studied using a Bruker D8 X-ray diffractometer with Cu K irradiation at λ = 1.5406 Å. For high-resolution TEM measurements, one drop of the alcohol dispersed suspension of sample was placed on a carbon-coated copper grid and allowed to dry in air. The grid was then observed on a Tecnai GF2 operated at an accelerating voltage of 400 kV. Selected area electron diffraction (SAED) patterns were also obtained. The absorbance spectrum of ZnO and ZnO-Ag hybrids samples were measured using a PerkinElmer Lambda35 fiber-optic UV-vis NIR spectrophotometer.