Surface studies of the chemical environment in gold nanorods supported by X-ray photoelectron spectroscopy (XPS) and ab initio calculations

Oliveira, Camila I. de; Chaves, Claudilene R.; Bargiela, Pascal; Rocha, Maria da Graça Carneiro da; Silva, Antônio Ferreira da; Chubaci, J.F.D.; Boström, Mathias; Persson, Clas; Malta, Maíra Barreto

doi:10.1016/j.jmrt.2021.08.059

Cited by 29 publications

(13 citation statements)

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“…S2 †), indicating that Au is mainly in its metallic state. 14 Au NPs exhibit a neat surface plasmon resonance band in the UV spectrum at 518 nm (Fig. S3 †), which matches earlier observations.…”

Section: Synthesis and Characterization Of Particlessupporting

confidence: 90%

Light-driven Pickering interfacial catalysis for the oxidation of alkenes at near-room temperature

et al. 2023

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Section: Synthesis and Characterization Of Particlessupporting

confidence: 90%

Light-driven Pickering interfacial catalysis for the oxidation of alkenes at near-room temperature

et al. 2023

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“…The figure shows the XPS Ag 3d spectrum, and the curve fitting presents characteristic Ag 3d 5/2 and Ag 3d 3/2 peaks at 368.4 and 374.35 eV, respectively. Other research teams that attributed this particular energy to zerovalent silver (Ag(0)) observed comparable values 35,36 …”

Section: Resultsmentioning

confidence: 76%

Fabrication of bimetallic Ni‐Ag/CNFs nanoparticles as a catalyst in direct alcohol fuel cells (DAFCs)

Awad

Mohammed

Abdel-Hady

et al. 2023

Polymers for Advanced Techs

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In the present work, an attempt to improve DAFC by replacing platinum with cheaper materials. Ni acetate-Ag nitrate supported by carbon nanofibers with three different samples (S1 95-5, S2 90-10, and S3 80-20%) for Ni and Ag, respectively, were synthesized by using the electrospinning method and then calcined under an Argon atmosphere at 900 C. Numerous analysis methods were employed to examine the chemical structure, the morphology, and the electrochemical (EC) features. The scanning electron microscope (SEM) confirms that all samples with different Ag concentrations exhibit good nanofiber morphology and a clear appearance of the nanoparticles. According to energy dispersive X-ray (EDX) mapping, the results prove that the carbonized polyvinyl alcohol nanofibers (PVANFs) have a consistent and even distribution of nickel and silver with an accurate percentage as previously prepared by molar ratio. Transmission electron microscope (TEM) shows that the interior structure has an amorphous carbon nanofiber structure with embedded crystalline spheres of silver and nickel. From X-ray diffraction (XRD) analysis, no hydroxide or oxide phases can be identified in the XRD pattern, which prove the existence of Ni-Ag nanoparticles in the metallic phase. For the electrooxidation of ethanol and methanol, the samples' electrocatalytic characteristics were examined. The effects of the electrolyte concentration, scan rate on the catalytic performance and electrode stability were studied using cyclic voltammetry (CV), chronoamperometry, and electrochemical impedance measurements (EIS). CV, chronoamperometry, and EIS reveal that the S2 sample has the best, superior electro-oxidation activity for both methanol and ethanol with the highest current density. Hence, This research provided a promising approach to fabricating a promising bimetallic Ni-Ag/CNFs catalyst to replace platinum in direct DAFCs.

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“…The most intense signal at lower BE (Ag3d 5/2 BE = 367.3 eV) is assigned to Ag + ions at the NR surface leading to the Ag + /Br − /CTA + , according to the literature on analogous systems. 15,17 It is noteworthy that this signal percentage is about 90% of all the silver sampled by XPS, i.e. , in the first nm of the AuNR surface (XPS sampling depths of a few nanometers 35 ).…”

Section: Resultsmentioning

confidence: 97%

Gold nanorods derivatized with CTAB and hydroquinone or ascorbic acid: spectroscopic investigation of anisotropic nanoparticles of different shapes and sizes

Amatori,

Lopez,

Meneghini

et al. 2023

Nanoscale Adv.

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Surface studies of the chemical environment in gold nanorods supported by X-ray photoelectron spectroscopy (XPS) and ab initio calculations

Cited by 29 publications

References 50 publications

Light-driven Pickering interfacial catalysis for the oxidation of alkenes at near-room temperature

Light-driven Pickering interfacial catalysis for the oxidation of alkenes at near-room temperature

Fabrication of bimetallic Ni‐Ag/CNFs nanoparticles as a catalyst in direct alcohol fuel cells (DAFCs)

Gold nanorods derivatized with CTAB and hydroquinone or ascorbic acid: spectroscopic investigation of anisotropic nanoparticles of different shapes and sizes

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