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. 2018 Jun 13;34(27):8031–8041. doi: 10.1021/acs.langmuir.8b01289

Figure 2.

Figure 2

(a) UV–vis absorption spectra of Bn-PNIPAm-SH brushes onto AuNRs in aqueous dispersion with cAuNRs = 1 mg mL–1 at 20 °C (solid line) and 50 °C (dotted line). The polymer molecular weight is Mn = 30 000 g mol–1. The inset shows the photograph of the corresponding aqueous dispersion that is temperature-independent. (b) Photographs of Bn-PNIPAm-SH brushes (Mn = 30 000 g mol–1) onto AuNRs in purified aqueous dispersion with cAuNRs = 50 mg mL–1 at 20 and 50 °C. (c) Photographs of Bn-PNIPAm-SH brushes (Mn = 12 500 g mol–1) onto AuNRs in purified aqueous dispersion with cAuNRs = 1.3 mg mL–1 (V = 500 μL) at 20 and 50 °C (left-hand side) and after addition of 12.5 mg sulphur-free PNIPAm (Mn = 12 500 g mol–1) at 50 °C and after cooling back to 20 °C (right-hand side).