Electronic Supplementary Information (ESI) Three dimensional dendrite Cu-Co/rGO architectures on disposable

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1 Electronic Supplementary Information (ESI) Three dimensional dendrite Cu-Co/rGO architectures on disposable pencil graphite electrode as an electrochemical sensor for non-enzymatic glucose detection K. Justice Babu, Sunirmal Sheet, Yang Soo Lee, and G. Gnana kumar*, Department of Physical Chemistry, School of Chemistry, Madurai Kamaraj University, Madurai , Tamil Nadu, India Department of Forest Science and Technology, College of Agriculture and Life Sciences, Chonbuk National University, 567Baekje-daero, Jeonju-si, Jeollabuk-do, Republic of Korea * Corresponding author: G. Gnana kumar : kumarg2006@gmail.com; Tel.No: µm (a) Figure S1. SEM image of PGE. 50 µm S1

2 Figure S2. EDAX patterns of (a) PGE, (b) Cu/PGE, (c) Cu-Co/PGE, and Cu-Co/rGO/PGE. S2

3 Figure S3. XPS core level spectra of (i) Cu 2p, (ii) Co 2p and (iii) C 1s energy levels of Cu-Co/rGO. S3

4 Figure S4. CV of Cu/PGE in 0.1 M NaOH at a scan rate of 20 mv s -1 (insets (a) and (b) show the corresponding magnified CV curve). S4

5 Figure S5. Plot of Ipa vs. pencil grade obtained from the Cu-Co/rGO nanostructures deposited over the different pencil grades in the presence of 5 mm glucose in 0.1 M NaOH at a scan rate of 20 mv s -1. S5

6 Figure S6. Calibration plot of (a) Ip vs. v 1/2 and (b) log Ip vs. log v for the CVs obtained at Cu-Co/rGO/PGE in the presence of 5 mm glucose as a function of scan rates in 0.1 M NaOH solution. S6

7 Figure S7. Electrochemical impedance spectra of studied PGEs in 0.1 M NaOH solution containing 5 mm glucose at the frequency range of 0.1HZ 0.1 MHZ. S7

8 Figure S8. The stability profile of Cu-Co/rGO/PGE in 2 mm glucose in 0.1 M NaOH solution. 50 µm S8

9 Table S1. Comparison of the electrochemical performances of enzyme-free glucose sensors. Electrode materials Linear range (mm) LOD a (μm) Sensitivity (μamm -1 cm -2 ) Ref. Co 3 O 4 /PbO 2 /carbon cloth NiCo 2 O 4 /ITO b r 2 rgo c /Cu NPs/Au NiCo 2 S 4 /Pt r 4 CuOx-CoOx/rGO c /GCE d Graphene/Cu/GCE d up to Cu NPs e /ZnO/ITO b q 7 Ni-Co NSs/RGO c /GCE d Cu-NG f /GCE d q 9 CuNi/KTO g /ITO b q 10 Ti/TiO 2 NTA h /Ni Cu CuO/C i Upto NiCFP j electrode PVdF-HFP k /Ni/Co NiNPs/TiO 2 Ny NWAs l CoOOH NSA m /Ti foils Cu/CuO/ZnO CuNiO-GR n /GCE d PtNi/ERGO o /GCE d Upto Cu-Co/rGO c /PGE p This work a limit of detection, b indium tin oxide, c reduced graphene oxide, d glassy carbon electrode, e nanoparticles, f nitrogen-doped graphene, g layered lithium potassium titanate, h nanotube arrays, i carbon electrode, j carbon nanofiber paste electrode, k polyvinylidenefluoride-cohexafluoropropylene, l nitrogen-doped TiO 2 nanowire arrays, m nanosheet arrays, n graphene, o electrochemically reduced graphene oxide, p pencil graphite electrode, q µamm -1, r μaμm -1 cm -2. S9

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