Morphologically manipulated Ag/ZnO nanostructures as surface enhanced Raman scattering probes for explosives detection

作者：Shaik Ummar Pasha; Hamad Syed; Mohiddon Md Ahamad; Soma Venugopal Rao; Krishna M Ghanashyam

来源：Journal of Applied Physics, 2016, 119(9): 093103.

DOI：10.1063/1.4943034

The detection of secondary explosive molecules (e.g., ANTA, FOX-7, and CL-20) using Ag decorated ZnO nanostructures as surface enhanced Raman scattering (SERS) probes is demonstrated. ZnO nanostructures were grown on borosilicate glass substrates by rapid thermal oxidation of metallic Zn films at 500 degrees C. The oxide nanostructures, including nanosheets and nanowires, emerged over the surface of the Zn film leaving behind the metal residue. We demonstrate that SERS measurements with concentrations as low as 10 mu M, of the three explosive molecules ANTA, FOX-7, and CL-20 over ZnO/Ag nanostructures, resulted in enhancement factors of similar to 10(7), similar to 10(7), and similar to 10(4), respectively. These measurements validate the high sensitivity of detection of explosive molecules using Ag decorated ZnO nanostructures as SERS substrates. The Zn metal residue and conditions of annealing play an important role in determining the detection sensitivity.

• 出版日期2016-3-7