Fig. 7From: AuNPs and 2D functional nanomaterial-assisted SPR development for the cancer detection: a critical reviewResonances shift of SPR biosensor with bare Au chip, silica-1 chip and silica-2 chip for PSA determination. The results showed that addition of silica layer between Au film and AuNPs significantly increased the resonance wavelength shift attributing to an improvement of sensitivity. Reprinted with permission from ref. (Jung et al. 2009)Back to article page