Confinement Effect of Plasmon for the Fabrication of Interconnected AuNPs through the Reduction of Diazonium Salts

Abstract

This paper describes a rapid bottom-up approach to selectively functionalize gold nanoparticles (AuNPs) on an indium tin oxide (ITO) substrate using the plasmon confinement effect. The plasmonic substrates based on a AuNP-free surfactant were fabricated by electrochemical deposition. Using this bottom-up technique, many sub-30 nm spatial gaps between the deposited AuNPs were randomly generated on the ITO substrate, which is difficult to obtain with a top-down approach (i.e., E-beam lithography) due to its fabrication limits. The 4-Aminodiphenyl (ADP) molecules were grafted directly onto the AuNPs through a plasmon-induced reduction of the 4-Aminodiphenyl diazonium salts (ADPD). The ADP organic layer preferentially grew in the narrow gaps between the many adjacent AuNPs to create interconnected AuNPs. This novel strategy opens up an efficient technique for the localized surface modification at the nanoscale over a macroscopic area, which is anticipated to be an advanced nanofabrication technique.

Plasmonic Au Nanoparticles Coated on ReS2 Nanosheets for Visible-Near-Infrared Photodetectors

“…The energy band diagram of synthesized ReS 2 is shown in Figure 7d. Because of the n-type nature of ReS 2 and the fact that the work function of Au-NPs (∼5.2 eV) 51,52 is greater than the work function of 5.1 eV, the nature of the contact is Schottky and hence a Schottky barrier is formed at the junction of Au-NPs and ReS 2 , as depicted in Figure 7e. The amelioration in the fabricated Au-NPs/ReS 2 device photocurrent compared to the pristine ReS 2 photodetector is attributed to the plasmonic effect of Au-NPs decorated on ReS 2 nanosheets.…”

Fabrication of an inverse opal structure of a hybrid metal-conducting polymer for plasmon-induced hyperthermia applications

“…hot holes and hot electrons), [11][12][13] and (ii) a local heat generation which is known as a consequence of transferring photon energy into the metal particle lattice through electron-photon interactions, along with phonon-phonon interactions with the medium surrounded. 14,15 In the literature, using plasmonic nanoparticle-induced heat towards thermal therapy for cancer treatment application have been widely developed. 16 This approach is similar to what has been proposed for magnetic hyperthermia when applying an alternate magnetic eld.…”

When ionic liquids meet diazonium salts to generate thin layers of modified surfaces

“…[16,17] Combining properly defined nanostructures and confinement effect even led to inhomogeneous growth of diazonium films on isotropic gold nanoparticles. [18] However, the most common reductive method remains the electrochemical assisted grafting. It is observed at soft reducing potential ranging from (0 to -0.6 V/SCE) which makes the grafting suitable over a wide range of conductive surfaces (metal, carbon-based materials, semiconductors).…”