Sensitive “hot spot”: Upon exposure to polar organic vapors like acetone and ammonia, a large peak shift is observed for the NC stretching band of 1,4-PDI that is situated in the gap between a gold electrode and gold nanoparticles (see figure). The peak shift is due to the large surface-to-volume ratio of Au nanoparticles.
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Shin et al. (2009) studied this question.
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