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. 2016 Aug 30;6:32185. doi: 10.1038/srep32185

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(a) SERS spectra of MTZ with different concentration using G-D-Ag, (b) calibration curve of the band at 1359 cm⁻¹. Laser ʎ = 633 nm, acquisition time; 20 sec, and objective; 50x.