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A ultra-sensitive fluorescent detection system (ppb level) for caffeine is formed by easily prepared poly(p-phenylenediamine) (PpPD) conducting polymer nanospheres. As a fluorescent sensing platform, the PpPD showed excellent selectivity, specificity and anti-interference ability. The dramatic quenching behavior in PL intensity of PpPD nanospheres when caffeine is added can be attributed to the fluorescence...
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