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Dual-emitting carbon dot/carbon dot (CD1/CD2) conjugates were prepared from combination of poly(ethylenimine)-functionalized CD1 with carboxyl-modified CD2. When excited with a laser of 800nm, the CD1/CD2 conjugates showed two-photon fluorescence (TPF) emissions peaked at 465nm (CD1) and 600nm (CD2). The TPF peak intensities at 465nm decreased near linearly after the addition of Cu2+ (0–3.2μM) due...
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