X-ray Photoelectron Spectra of Ag-Au Colloidal Nanoparticles after Interaction with Linear Carbon Chains

Abstract

The results of X-ray photoelectron spectra (XPS) characterization of the surface of Ag-Au colloidal nanoparticles (Ag-Au NPs), prepared by laser ablation in water before and after interaction with linear carbon chains (LCC), are presented. No additional features appear in high-energy resolved XPS core level spectra of Ag-Au NPs which indicates that surface is not oxidized. The measurements of XPS Ag 3d-spectrum of (Ag-Au)@LCC manifests the additional low-energy structure that is associated with the formation of Ag–C bonds. The charge transfer between Au atoms on the NPs surface and LCC was established. Additionally, some oxidation of the Ag atoms on the surface of (Ag-Au)@LCC is observed which arises during laser ablation in water. We assume that oxidative species will preferably interact with the areas outside the LCC instead of oxidizing the carbon chains which was confirmed by XPS C 1s spectra.

AgAu Hollow Nanoshells on Layered Graphene Oxide and Silica Submicrospheres as Plasmonic Nanozymes for Light-Enhanced Electrochemical H2O2 Sensing

“…This signal is lower than the 84.0 eV expected for Au 0 . This difference can be related to the cluster-sized material, which already lead to works reporting Au 0 -related signals between 82.6 and 83.1 eV. ,, …”

“…This can indicate the presence of Ag + , to some extent, but due to the low signal-to-noise ratio observed, a deconvolution could not be performed. 65,66 For the Au 4f signals, the intensity was very low and the proximity to the Si 2p signals made the analysis more difficult. In this case, we decided to discuss just the Au 4f 7/2 , since the signals which should be related to Au 4f 5/2 were too broad to be distinguished from the baseline in the case of the SiO 2 supported material.…”

“…50 This difference can be related to the cluster-sized material, which already lead to works reporting Au 0 -related signals between 82.6 and 83.1 eV. 65,67,68 Electrochemical Characterization. After material synthesis and characterization, we focused on their application as nanozymes for plasmon-enhanced H 2 O 2 electroreduction and sensing.…”

“…In both cases, the signal located at lower binding energies is always broader than that located at higher binding energies. This can indicate the presence of Ag + , to some extent, but due to the low signal-to-noise ratio observed, a deconvolution could not be performed. , …”

Stretchable and Directly Patternable Double-Layer Structure Electrodes with Complete Coverage

“…This coordination anchors PDMS substrates and Ag NWs by forming PDMS–O–PVP–Ag linkage. In addition, the interface between Ag NWs and Au showed high adhesion because the Ag 3d 5/2 in the Ag–Au bond has a high binding energy of ∼368 eV owing to the default metal (hydrophilic)–metal (hydrophilic) interaction . Additionally, the O present in the pyrrolidone ring of PVP bonded via Ag:O coordination − on the surface of the Ag NWs form the hydrophilic interactions with Au, thus improving the Ag NWs and Au adhesion further.…”