Kinetic Study on the Adsorption of 2,3,5,6-Tetrafluoro-7,7,8,8-tetracyanoquinodimethane on Ag Nanoparticles in Chloroform: Implications for the Charge Transfer Complex of Ag–F₄TCNQ

Abstract

In this study, the kinetics of the adsorption of 2,3,5,6-tetrafluoro-7,7,8,8-tetracyanoquinodimethane (F 4 TCNQ) on the surface of Ag nanoparticles (Ag NPs) in chloroform has been intensively investigated, as molecular doping is known to play a crucial role in organic electronic devices. Based on the results obtained from UV−visible (vis)−near-infrared (NIR) absorption spectroscopy, cryogenic transmission electron microscopy, scanning nanobeam electron diffraction, and electron energy loss spectroscopy, a two-step interaction kinetics has been proposed for the Ag NPs and F 4 TCNQ molecules, which includes the first step of electron transfer from Ag NPs to F 4 TCNQ indicated by the ionization of F 4 TCNQ and the second step of the formation of a Ag−F 4 TCNQ complex. The whole process has been followed via UV−vis−NIR absorption spectroscopy, which reveals distinct kinetics at two stages: the instantaneous ionization and the long-term complex formation. The kinetics and the influence of the molar ratio of Ag NPs/F 4 TCNQ molecules on the interaction between Ag NPs and F 4 TCNQ molecules in an organic solution are reported herein for the first time. Furthermore, the control experiment with silica-coated Ag NPs manifests that the charge transfer at the surface between Ag NPs and F 4 TCNQ molecules is prohibited by a silica layer of 18 nm.

Colloidal Black Gold with Broadband Absorption for Plasmon-Induced Dimerization of 4-Nitrothiophenol and Cross-Linking of Thiolated Diazonium Compound

“…The nanowires were then dispersed in water for further use. In order to compare the plasmonic activity toward the cross-linking of the diazonium molecules, gold nanoparticles known as gold nanoflowers (AuNFs) and silver nanoparticles (AgNPs) have been prepared according to our recently published protocols and used as plasmonic substrates for the reaction. , …”

“…In order to compare the plasmonic activity toward the cross-linking of the diazonium molecules, gold nanoparticles known as gold nanoflowers (AuNFs) and silver nanoparticles (AgNPs) have been prepared according to our recently published protocols and used as plasmonic substrates for the reaction. 11,28 SERS Substrate. Before the Raman measurements, the silicon substrate was cleaned in a solution of 30 wt % H 2 O 2 and 30 wt % H 2 SO 4 .…”

Colloidal black gold with broadband absorption for plasmon-assisted crosslinking of thiolated diazonium compound

“…To compare the plasmonic activity towards the crosslinking of the diazonium molecules, gold nanoparticles known as gold nanoflowers (AuNFs) and silver nanoparticles (AgNPs) have been prepared according to our recent published protocols and used as plasmonic substrates for the reaction. 11,28 SERS substrate. Before the Raman measurements, the silicon substrate was cleaned in a solution of 30 wt % H2O2and 30 wt % H2SO4.…”

Colloidal black gold with broadband absorption for photothermal conversion and plasmon-assisted crosslinking of thiolated diazonium compound

“…To compare the plasmonic activity towards the crosslinking of the diazonium molecules, gold nanoparticles known as gold nanoflowers (AuNFs) and silver nanoparticles (AgNPs) have been prepared according to our recent published protocols and used as plasmonic substrates for the reaction. 11,28 SERS substrate. Before the Raman measurements, the silicon substrate was cleaned in a solution of 30 wt % H2O2 and 30 wt % H2SO4.…”