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Fig. 3 | Nano Convergence

Fig. 3

From: Ultrasensitive and real-time optical detection of cellular oxidative stress using graphene-covered tunable plasmonic interfaces

Fig. 3

Characteristics of the graphene-covered plasmonic NPs and their optical properties. a Graphene transfer process to the NP immobilized on the APTES-modified glass substrate (upper) and photographs of substrates before and after transferring a graphene layer (lower). Scale bars represent 2 cm. b Scanning electron micrographs of the SNPs (left) and the graphene-covered SNPs (right). Scale bars represent 200 nm. c Topographic images (i) and height profiles (ii) of the graphene layers transferred on the glass substrate. Scale bar represents 2 μm. Height profiles correspond to the lines denoted as G1 and G2. d Raman spectra of the graphene-covered SNP substrate. e Dark-field scattering images of the graphene-covered plasmonic SNPs with increasing number of graphene layers. The scale bars represent 10 μm. f Corresponding scattering spectra measured for the SNPs with increasing number of graphene layers. g Plots for the shifts in terms of λmax (i), FWHM (ii), and intensity (iii) with increasing number of graphene layers on the SNP

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