2-D organization of silica nanoparticles on gold surfaces: CO₂marker detection and storage

Abstract

A single layer of silica nanoparticles with an average size of ∼200 nm was deposited over the surface of pristine gold wafers, aided by (3-mercaptopropyl)trimethoxysilane.

APTES-Based Silica Nanoparticles as a Potential Modifier for the Selective Sequestration of CO2 Gas Molecules

“…Binding energies were calibrated against the binding energy of the Au 4f 7/2 peak at 84.0 eV for the gold samples. With the aim of analyzing the SiO 2 (50 nm) and APTES@SiO 2 (50 nm) elemental composition and chemical bonding, the nanoparticles were immobilized in a 11 × 11 × 1 mm size gold wafer following a protocol adapted from Cueto et al [35]. To a solution of 3-MPTS (40 mM) in MeOH was added a gold wafer and was kept submerged for 3 h. After that, the wafer was rinsed with MeOH, dried, and submerged in a different solution of NaOH 0.01 M for 3 h. In parallel, a pH = 9 suspension of SiO 2 (100 mg) in 20 mL of mQ water was prepared.…”

“…The hybrid nanomaterials were immobilized into Au wafers following the protocol adapted from Cueto et al [35] and recorded in a ThermoScientific Apreo C-LV field emission electron microscope (FE-SEM) equipped with an Aztec Oxford energy dispersive X-ray microanalysis system (EDX)…”

“…A deconvolution study of the C 1s peak (Figure 4, right) shows three components for both cases, the first component has a binding energy (B.E.) at 284.8 eV is attributed to the C-H and C-C group [35], the second component at 286.6 eV corresponds to O-CH 3 (MPTS-mediated binding by Au wafers to NPs) and C-N groups (APTES chemical composition), whereas the third component observed at 288.7 eV is assigned to the C=O groups. After APTES functionalization there is a remarkable increase, four times the intensity for the first component (at 284.8 eV, assigned to the C-H and C-C group [35]), and three times the intensity for the second component at 286.6 eV related to the C-N groups, both carbon components are strongly related to the functional groups forming part of APTES ligand structure.…”

“…at 284.8 eV is attributed to the C-H and C-C group [35], the second component at 286.6 eV corresponds to O-CH 3 (MPTS-mediated binding by Au wafers to NPs) and C-N groups (APTES chemical composition), whereas the third component observed at 288.7 eV is assigned to the C=O groups. After APTES functionalization there is a remarkable increase, four times the intensity for the first component (at 284.8 eV, assigned to the C-H and C-C group [35]), and three times the intensity for the second component at 286.6 eV related to the C-N groups, both carbon components are strongly related to the functional groups forming part of APTES ligand structure. Then, the increment of the XPS signal for both elements, nitrogen and carbon, confirm the successful linkage of the APTES molecule onto the silica nanoparticles' surface.…”

Novel magnetic bimetallic AuCu catalyst for reduction of nitroarenes and degradation of organic dyes

“…In the Si 2p spectroscopy, the peaks at 101.6, 102.8, and 103.5 eV corresponded to Si–C, Si–O–C, and O–Si–O, respectively (Fig. 5 b) 47 , 48 . XPS analysis of C 1s plot showed peaks located at 284.8, 286, and 288.5 eV which were ascribed to C–C, C–OH, and N–C=N, individually (Fig.…”