Figure 1.

SPR spectra of the samples (a) 2, (b) 3, (c) 4 in Table 1 after preparation and (d) the sample 4 keeping still for a month. The inset is the photograph of samples 1, 2, 3, and 4 standing for a month at room temperature.

Wang et al. Nanoscale Research Letters 2011 6:259   doi:10.1186/1556-276X-6-259
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