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. Author manuscript; available in PMC: 2020 Sep 27.
Published in final edited form as: ACS Sens. 2019 Aug 21;4(9):2403–2411. doi: 10.1021/acssensors.9b00994

Fig. 1.

Fig. 1

Physical characterization of ND/CFMEs. SEM images of (A) ND-H 5/CFME, (B) ND-COOH 5/CFME, (C) ND-COOH 15/CFME, and (D) ND-COOH 60/CFME. The modified electrodes were prepared from drop casting for 10 drops. Scale bar: 500 nm.