Abstract
Assembly of plasmonic nanoparticles (NPs) in suspensions is a promising approach for the control of optical and sensing properties that depend on the assembled states of plasmonic NPs. This review focuses on the controlling methods to assemble the NP via external stimuli such as pH, temperature, light, magnetic field, and electric field. External stimuli are introduced as powerful tools to assemble the NPs because of various operational factors, such as the intensity, application time, and frequency, which can be employed. In addition to a summary of recent studies on the controlling methods, a future study on the reversible control over assembled states of the plasmonic NPs via external stimuli is proposed.
Highlights
Localized surface plasmon resonance (LSPR) is a remarkable characteristic of plasmonic nanometals such as silver and gold [1,2]
This study showed that the assembled state of the NPs was restored dispersed state of of the
We focused on the control over plasmonic NP assembly via external stimuli: pH, temperature, light, magnetic field, and electric field
Summary
Localized surface plasmon resonance (LSPR) is a remarkable characteristic of plasmonic nanometals such as silver and gold [1,2]. Previous magnetic reports onfield, assembling plasmonic according external stimuli: pH, light, temperature, and electric field. Kundu et al [60] proposed a reversible system for controlling the Spiropyran, which is commercially used asthe a photochromic compound, a remarkable assembly of Au. NPs coated is with spiropyran light-responsive molecule [60,61]. Since it is possible that the photoresponsive molecules are damaged by high-powered light, an alternative approach without the molecules developed to control the assembled states of plasmonic. NPs. Lin et al [62]using proposed an assemblywas system of Au nanoplates with a laser low enough alternative approach without using the molecules was developed to control the assembled states of (power: 0.1 Lin mW)etnot damage non-photoresponsive molecules, as cetyltrimethylammonium plasmonic al. Not to damageofnon-photoresponsive molecules, suchasasshown cetyltrimethylammonium and induced thermophoresis the
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