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Supplementary Information

Is Chemically Synthesized Graphene ‘Really’ a Unique Substrate for SERS and Fluorescence Quenching?

Sanchita Sil, Nikki Kuhar, Somnath Acharya, Siva Umapathy

 

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1. Characterization of graphene synthesized using NaBH4 and clove as reducing

agents

Figure S1a. XRD plot of NaBH4 reduced graphene from GO

Figure S1b. UV-Vis spectra of clove reduced graphene (black spectra refers to GO and red corresponds to graphene)

 

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Figure S1c. IR & XRD plot of clove reduced graphene from GO

2. Raman Spectra of Carbon Substrates

Figure S2a. Raman spectra of clove reduced graphene. The inset shows the spectra of the higher range

 

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Figure S2b. Raman spectra of NaBH4 reduced graphene. The inset shows the spectra of the higher range

Figure S2c. Raman spectra of MWCNT. The inset shows the spectra of the higher range

 

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Figure S2d. Raman spectra of graphite. The inset shows the spectra of the higher range

Figure S2e. Raman spectra of charcoal. The inset shows the spectra of the higher range

 

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3. Structure of analytes

Figure S3. Analytes chosen for the Raman spectroscopic studies.

4. BET Surface area measurement Samples Pore Diameter (nm) BET surface area (m2/g)

GO 9.4271 33 Chemically reduced Graphene 3.5045 401

MWCNT 29.1308 217 Graphite 21.5834 8

Activated Charcoal 4.2106 887 Table S4. BET Surface area measurements of the carbon substrates .

 

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5. UV-Vis spectra of analytes

Figure S.5a . Absorption spectra of R6G in water

Figure S.5b . Absorption spectra of RB in water

 

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Figure S.5c . Absorption spectra of CV in water

Figure S.5d . Absorption spectra of NBA in water

 

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6. Solid spectra of R6G

Figure S6. Raman spectra of solid R6G at 514.5 nm

 

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7. Raman spectra of RB, CV and NBA

Figure S.7a . Raman spectra of 10-7 M rhodamine B (RB) adsorbed on a) GO, b) graphene reduced by NaBH4, c) graphene reduced by clove extract, d) multi-walled carbon nanotube (MWCNT), e) graphite and f) charcoal (activated)

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Figure S.7b . Raman spectra of 10-6 M Crystal Violet (CV) adsorbed on a) GO, b) graphene reduced by NaBH4, c) graphene reduced by clove extract, d) multi-walled carbon nanotube (MWCNT), e) graphite and f) charcoal (activated)

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Figure S.7c . Raman spectra of 10-6 M Nile Blue A (NBA) adsorbed on a) GO, b)

graphene reduced by NaBH4, c) graphene reduced by clove extract, d) multi-walled carbon nanotube (MWCNT), e) graphite and f) charcoal (activated)

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