SIZE CONTROL OF ZnO NANOROD PREPARED BY HYDROTHERMAL PROCESS FOR REUSABLE SERS APPLICATIONS
Keywords:
Reusable SERS, Raman signal, ZnO nanorods, Hydrothermal process, Self-cleaningAbstract
Surface Enhanced Raman Scattering (SERS) is a sensitive surface used to amplify the Raman signal of Raman spectroscopy. The enhancement of SERS sensitivity can reach up to a million times because of the surface Plasmon resonance of noble metal decorated on SERS substrate. Reusable SERS was originated to reduce production cost and extend life time; however, the ability to enhance Raman signal of reusable SERS is still less than the original SERS. In this work, the optimum performance to enhance the Raman signal of the reusable SERS will be investigated. Diameter and length of ZnO nanorods, grown as SERS substrates, are varied. ZnO nanorods are grown by hydrothermal process with different concentrations of zinc nitrate hexahydrate (Zn(NO3)2•6H2O) mix with hexamethylenetetramine (CH2)6N4 between 2.5-70 mM. Field Emission Scanning Electron Microscope (FE-SEM) images show that diameters and lengths of ZnO nanorods are directly proportional to the concentrations of the solution. Afterwards, gold nanoparticles are decorated on the nanorods by magnetron sputtering technique. The hot spot of gold nanoparticles is changed according to the different appearance of ZnO nanorods which affects the Raman signal. Performance to enhance the Raman signal is examined by dropping methylene blue (MB) on reusable SERS and analysing with Raman technique. UV light is used to activate the self-cleaning property of the reusable SERS. From the results, all reusable SERS can enhance the Raman signal. The reusable SERS substrate with the highest concentration, 70 mM, demonstrates the highest performance to enhance Raman signal even in a small amount of instant solution.
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