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. Author manuscript; available in PMC: 2018 Aug 1.
Published in final edited form as: J Raman Spectrosc. 2017 May 31;48(8):1056–1064. doi: 10.1002/jrs.5170

Figure 4.

Figure 4

(a) Raman spectra of bio-GO incubated with SKBR3 cell for 24 hours after that extracted by cell acid digestion. (b) Inverted microscope image shows no fluorescence after 24 hours incubated cell under 514 nm light illumination. (c) Bright field inverted microscope image of acid digested sample showing accumulated GO in white light background. (d) Fluorescence microscope image of acid digested sample shows a strong luminescence directly from nano size graphene oxide retrieved after acid digestion.