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Carbon nanotube and related carbon (fullerene) nanoparticle aggregate in the El Paso, TX, USA outdoor air. (a) Bright-field TEM image. (b) Dark-field TEM image using the diffracted regime within the objective-aperture double exposure in the SAED pattern insert. Prominent hexagonal graphite (a = 0.25 nm, c = 0.67 nm) diffraction rings are indicated in the SAED pattern insert.
