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(A): absorption spectra of as-prepared inks; (B): inks after 7 days ageing; (C–E) absorption spectra of dry printed patterns after 1 day (dashed lines) and 14 days ageing (solid lines) for AuNP@HS-PEGCOO(−) (C), AuNP@HS-PEGCOO(−)/PAH(+) (D), AuNP@HS-PEGCOO(−)/PAH(+)/PSS(−) (E); insets are photos taken on 14 days aged prints; F-G: SEM imaged of 14 days aged prints with AuNP@HS-PEGCOO(−) (F) and AuNP@HS-PEGCOO(−)/PAH(+)/PSS(−) (G).
