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A novel surface plasmon resonance (SPR) enhanced upconversion (UC) luminescence system was designed for the detection of α-fetoprotein (AFP) by using gold nanoparticle (NP) coated NaYF 4 :Yb,Er,Gd upconversion nanoparticles (UCNPs) as probes.
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Ma et al. (2017) studied this question.
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