Skip to main content
. 2019 Oct 14;9(4):125. doi: 10.3390/bios9040125

Figure 1.

Figure 1

(a) Process of TLC-SERS detection of THC from urine samples via a portable Raman spectrometer. (b) The Raman spectra of a Si wafer at various working distances from the fiber tip, and (c) intensities versus different working distances using the IRaman peak at 518 cm−1.