A pH sensor based upon gentle covalent modification of individual metallic single-wall carbon nanotubes is demonstrated. The sensing mechanism relies upon the protonation-dependent charge carrier scattering (see figure) by N,N-diethylaniline moieties anchored to the tube sidewall. This novel approach holds promise to extend the accessible range of nanotube-based (bio)chemical sensors.
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Maroto et al. (2006) studied this question.
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