Fig. 2 | Nature Communications

Fig. 2

From: High-power hybrid biofuel cells using layer-by-layer assembled glucose oxidase-coated metallic cotton fibers

Fig. 2

Characterization of the metallic cotton fiber electrode. a Photographic images of bare cotton fiber (i.e. 0-MCF, metallic cotton fibers is abbreviated as MCF) and 20-bilayered metallic cotton fibers (20-MCF) (scale bar, 1 mm). b Field-emission scanning electron microscopy (FE-SEM) images of the 20-MCF (scale bar, 50 µm (left) and 5 µm (right)). c Cross-sectional FE-SEM, and energy-dispersive X-ray spectroscopy (EDS) mapping images of the 20-MCF electrode with a diameter of ~200 μm (scale bar, 100 µm (left) and 20 µm (right)). d Change in the areal loading amount of the (tetraoctylammonium bromide-stabilized Au nanoparticle (TOA-Au NP)/tris-(2-aminoethyl)amine (TREN))n multilayers adsorbed onto porous cotton fibers and nonporous nylon fibers with the same diameter (~200 μm) as the number of bilayers (n) increases. e Resistivity and electrical conductivity of n-MCFs as a function of n. The error bars show the standard deviation from the mean value of electrical conductivities for 3−5 independent experiments. f Fourier transform infrared (FTIR) spectra of the (TOA-Au NP/TREN)n multilayers as a function of n. g CV curves of n-bilayered metallic cotton fibers (n-MCF) at a scan rate of 5 mV s−1 in a phosphate-buffered saline (PBS) solution. h Nyquist plots of n-MCFs in the frequency range 0.2 Hz to 100 kHz. Inset: Nyquist plots magnified in the high-frequency range. The equivalent series resistance (ESR) values of n = 5, 10, and 20 were 1346, 60, and 30 Ω, respectively

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