Facile reversible LSPR tuning through additive-induced self-aggregation and dissemination of Ag NPs: role of cyclodextrins and surfactants

摘要: Tuning the optoelectronic properties by controlling coupled surface plasmon modes in metal nanomaterials is a major challenge. Several methods have been developed for localized resonance (LSPR) tuning, which are generally provoked self-assembly of certain molecule (e.g. protein or viologen) that cause aggregation nanoparticles. Here, we new, simple method applied on dilute cetyltrimethylammonium bromide (CTAB)-stabilized Ag NPs reversible LSPR tuning through additive-induced formation and subsequent dispersion self-aggregates. Addition cyclodextrin (α- β-) results decrease charge taking away CTAB from nanoparticle an inclusion complex. The slow self-aggregates due to gradual charge, large red-shifting band (436 nm 537 nm). Subsequent addition different types surfactants alters re-attachment stabilizer with blue-shifting (537 420 This efficient break down monitored dynamic light scattering (DLS) transmission electron microscopy (TEM) measurements correlated alteration plasmonic absorption band. Variation followed zeta-potential measurements. easy approach control position can be very significant applications such as sensing devices.