S1
Supporting information
“Rinse, Repeat”: An Efficient and Reusable SERS and Catalytic Platform Fabricated by Controlled Deposition of Silver Nanoparticles on Cellulose Paper
Debanjan Das, Subrata Senapati and Karuna Kar Nanda*
Materials Research Centre, Indian Institute of Science, Bangalore – 560012, India
*E-mail: nanda@iisc.ac.in
Number of pages: 7, Number of Figures: 5, Number of Tables: 1.
Contents:
EDX spectrum of Ag nanoparticles……….…………..… Figure S1 Photograph of the in-situ synthesis process and SEM images of Ag nanoparticles .… Figure S2 Raman Spectrum of Rh6G on Si and EF of Ag nanoparticles for Rh6G ………...….. Figure S3
Raman Spectrum of RhB on Si and EF of Ag nanoparticles for RhB ...……….. Figure S4 UV-Vis absorbance spectra of 4-nitrophenolate ……….. Figure S5 Comparison table for different Ag substrates ……… Table S1
S2 Figure S1: EDX spectrum of Ag NPs decorated paper.
Figure S2: (a) Photograph of the in-situ synthesis, (b) low and (c) high magnification SEM micrographs of Ag NPs decorated paper obtained in absence of ammonia.
(c) (a)
(b)
S3
Figure S3. (a) Normal Raman spectrum of Rh6G (10-3mM) on Si substrate. (b) Variation of EF with Ag content in the substrate.
500 1000 1500 2000
2000 3000 4000 5000 6000 7000
Intensity (a.u.)
Raman shift (cm-1)
(a)
0.5 1.0 1.5 2.0
0.6 0.8 1.0 1.2 1.4
EF (1010 )
Amount of Ag
Rh6G
(b)
S4
Figure S4. (a) Normal Raman spectrum of RhB on Si substrate. (b) Variation of EF with Ag contents.
500 1000 1500 2000 2500
Intensity (a.u.)
Raman shift (cm-1)
RhB on Si (10-3)
(a)
0.05 0.10 0.15 0.20
0.3 0.4 0.5 0.6 0.7
EF (x106 )
Amount of Ag
(b)
S5
Figure S5. (a) UV-Vis absorbance spectra of 4-nitrophenol before (blue) and after (red) the addition of NaBH4, (b) UV-Vis absorbance spectra of 4-Nip in absence of catalyst.
S6
Table S1: Comparison between Ag decorated filter paper (Ag3) with other Ag-based SERS substrates reported in literature
SERS substrates Preparation method
Analyte/s EF References
Polyvinyl alcohol (PVA) film
Spin
coating/annealing
Rh6G 2.8108
1
Polyaniline Fiber Stirring at 25 oC 4-MBA and R6G 1.9 × 108 and 1.2 × 109
2
Graphene Ultrasonication followed by heating at 90 oC
p-ATP 2.16 103
3
Silicon substrate Stirring at 30 oC Rh6G 4.91010
4
Porous carbon films
Shaking at room temperature
crystal violet 2.7 × 106
5
Porous anodized aluminum oxide
Thin film deposition by sputtering
Rh6G 1104
6
Porous anodic Alumina
DC sputtering Chloramphenicol (antibiotic in food systems)
2 × 104
7
Cellulose paper (Ag3)
“Silver mirror”
reaction at 70 oC using glucose
Rh6G and RhB 1.421010 and 0.695106
Present work
S7 References:
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