Direct Fabrication of Reduced Graphene Oxide@SnO₂ Hollow Nanofibers by Single-Capillary Electrospinning as Fast NO₂ Gas Sensor

Figure 3

(a) TEM image of an as-prepared fiber segment; (b) TEM image of an open tip of a rGO@SnO₂ fiber; (c) HRTEM image of large nanoparticles; (d) HRTEM image of small nanoparticles.

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