Supporting information. Insight mechanism revealing the peroxidase mimetic catalytic activity of
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1 Electronic Supplementary Material (ESI) for Nanoscale. This journal is The Royal Society of Chemistry 2015 Supporting information Insight mechanism revealing the peroxidase mimetic catalytic activity of quaternary CuZnFeS nanocrystals: colorimetric biosensing of hydrogen peroxide and glucose Amit Dalui, a Bapi Pradhan, a Umamahesh Thupakula, a Ali Hossain Khan, a Gundam Sandeep Kumar, a Tanmay Ghosh, b Biswarup Satpati, b and Somobrata Acharya*,a a Centre for Advanced Materials, Indian Association for the Cultivation of Science, Jadavpur, Kolkata , India; b Surface Physics and Material Science Division, Saha Institute of Nuclear Physics, 1/AF Bidhannagar, Kolkata , India *Corresponding author camsa2@iacs.res.in Contents: 1. XPS of OA, OLA capped CZIS NCs.Figure S1 2. Schematic of reaction pathways for TMB oxidation.figure S2 3. Dependence of peroxidise-like activity on ph...figure S3 4. Control experiment with leached ion solution...figure S4 5. TEM images of the different NCs..Figure S5 6. Effect of NCs composition on peroxidise-like activity...figure S6 7. STS and UPS spectra of M-CZIS NCs..Figure S7 8. Effect of scavenger on peroxidise-like activity of M-CZIS NCs...Figure S8 9. Comparison of peroxidise-like activity of with and without H 2 O 2....Figure S9 10. EPR spectrum of DMPO- OH adduct Figure S PL spectra of 2-hydroxyterephthalic acid...figure S Glucose selectivity experiment..figure S N 2 adsorption isotherm...figure S13
2 Figure S1. High resolution XPS spectrums of the as synthesized CZIS NCs revealing the peaks corresponding to the constituent elements, like (a) Cu, (b) Zn, (c) Fe and (d) S respectively. The Cu-2p doublet peaks (2p 1/2 and 2p 3/2 ) appear at binding energies of ~952.1 ev and ~932.4 ev respectively with a splitting energy of ~19.7 ev indicates the presence of monovalent Cu. The Zn-2p doublet peaks (2p 1/2 and 2p 3/2 ) appears at binding energy of ~ ev and ~ ev with a separation energy gap of ~22.6 ev are indicative of presence of divalent Zn. The Fe-2p doublet peaks (2p 1/2 and 2p 3/2 ) arise at binding energies of ~724.4 ev and ~710.7 ev with a separation of ~13.7 ev is attributed to trivalent Fe. The S-
3 2p doublet peaks at binding energies of ~161.9 ev and ~162.9 ev are consistent with the S in alloyed metal sulfides nanocrystals. H 2 N NH 2 + H 2 O 2 + 2H + M-CZIS NCs H 2 N + + NH 2 + H 2 O TMB λ max = 285 nm Di-imine (yellow) λ max = 450 nm H 2 N NH 2 Di-amine H 2 N + + NH 2 Di-imine Charge transfer complex (blue) oxtmb λ max = 370, 652 nm Figure S2. Schematic presentation of reaction pathways occurred during the conversion of TMB to oxidized TMB (oxtmb) in presence of M-CZIS NCs and H 2 O 2 in acetate buffer (ph= 4.2).The color of oxidized TMB (blue color) and the wavelength of maximum absorption peaks are leveled in the bottom of the each structures.
4 Relative activity (%) ph Figure S3. ph dependent peroxidase like activity of M-CZIS NCs of the reaction medium. The relative activity of 100% is set where the absorbance at 652 nm is highest and relative activity for other are calculated accordingly. Figure S4. Comparison of absorption spectra of oxtmb produced by the ion leached solution (black curve) and M-CZIS NCs (blue curve). Inset showing the photograph of reaction color solution produced by the leached ion solution (a) and M-CZIS NCs (b) respectively.
5 Abs (652 nm) Figure S5. Transmission electron microscope images of the nanocrystals used in the peroxidase-like catalytic activities. (a) copper sulfide (~9 ± 1 nm), (b) zinc sulfide (~10 ± 2 nm), (c) iron sulfide (~3 ± 2 nm), (d) copper-zinc-sulfide (~14 ± 2 nm), (e) copper-iron-sulfide (~10 ± 2 nm) and (f) copper-zinc-ironsulfide (~12 ± 3 nm) ZS CS IS CZS CIS CZIS Time (min) Figure S6. Effect the elemental composition of the NCs capped with MPA on the peroxidase-like catalytic activity by monitoring the absorbance change at 652 nm exhibited by different NCs; ZS (zinc sulfide), CS (copper sulfide), IS (iron sulfide), CIS (copper-iron-sulfide) and CZIS (copper-zinc-ironsulfide).
6 Figure S7. (a) I-V curve measured on isolated M-CIZS NCs. Typically ~50 I-V curves are averaged to improve the signal to noise ratio. The I-V measurements were performed at set-voltage of 1 V and setcurrent of 0.1 na. (b) UPS spectrum of M-CIZS NCs measured in UHV conditions. Inset: enlarged threshold position showing the onset binding energy of ~1.95 ev. Figure S8. Change in absorption of oxtmb in presence of scavenger during the catalytic TMB oxidation. Absorbance of oxtmb at 652 nm have been monitored in presence of different radical scavenger: blank (without any scavenger), N 2 (at inert atmosphere), MA (methyl alcohol), IPA (iso-propylalcohol), AO (ammonium oxalate), EDTA (ethylenediaminetetraacetic acid).
7 Intensity (a.u.) Figure S9. Peroxidase-like activity of M-CZIS NCs performed in presence of H 2 O 2 and absence of H 2 O 2. For without H 2 O 2 experiment, 0.9 mm TMB, 200 μg of M-CZIS NCs are used and solution is illuminated with UV light of 365 nm wavelength for 20 minutes. While for with H 2 O 2 experiment, 0.1mM TMB, 50 μg of M-CZIS NCs, 5 mm H 2 O 2 are used and reaction performed at normal day light. Absorption spectrum and photograph (inset of the figure) are taken after 20 minutes of the reaction Magnetic field (G) Figure S10. EPR spectrum of the DMPO- OH radical adduct.
8 Intensity (a.u.) 7 g ml g ml g ml g ml g ml Wavelength (nm) Figure S11. Evolution of PL spectra of the 2-hydroxy terephthalic acid measured in presence of different M-CZIS NCs concentration in acetate buffer medium. The excitation wavelength was 315 nm.
9 N 2 adsorbed (ccg -1 ) at STP Figure S12. Absorbance changes at 652 nm of TMB oxidation by hydrogen peroxide produced by glucose and other saccharides or interferents. Glucose was used 1mM while the other materials were used five times higher concentration than glucose. Inset showing the color of the reaction solution produced by the different materials. Although the glucose concentration was five times lower the greater absorbance for glucose indicates greater selectivity towards glucose. Inset photograph showing the color reaction produced by the different materials started from (a) ascorbic acid (b) maltose (c) galactose (d) mannose and (e) glucose respectively Dv(d) (cc/å/g)x Pore width (nm) 5 Adsorption Desorption Relative Pressure (P/P 0 ) Figure S13. N 2 adsorption isotherm of M-CZIS NCs measured using Brunauer-Emmett-Teller (BET) method to obtain surface area. Inset graph is showing the pore width distribution of M-CZIS NCs calculated using non-local density functional theory (NLDFT) method.
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