One-step nitrogen plasma process for bimetallic impregnation to obtain N-TiO_2−X/Au/Ag composite

Abstract

The main motivation of this work is to deposit two different metals (gold and silver) on titanium oxide nanoparticles surface in a one-step simple and fast physical process by applying a nitrogen plasma as the main source of nitrogen atoms to obtain nanostructured N-TiO2 − X/Au/Ag materials. The obtained nanomaterials were characterized by X-ray photoelectron spectroscopy, X-ray diffraction, diffuse reflectance spectroscopy, scanning electron microscopy–energy dispersive X-ray spectroscopy, and high-resolution transmission electron microscopy. Based on the characterization results, we found that gold and silver nanoparticles were uniformly loaded on the titanium oxide nanocomposite surface, showing a surface plasmon absorption band due to the loading of the metal nanoparticles over titania samples. The results of this work have shown that nitrogen plasma technique is a more feasible and simple alternative to obtain the N-TiO2 − X/Au/Ag nanocomposite. Moreover, this plasma technique could be used to impregnate with other kind of metals over the surface of diverse nanomaterials.

Quantum dot-modified titanium dioxide nanoparticles as an energy-band tunable electron-transporting layer for open air-fabricated planar perovskite solar cells

“…The characteristic peak positions at 25.3 (101), 37.6 (004), 47.9 (200), 54.7 (105), 62.7 (204), and 75.1 (215) appeared in all samples, corresponding to the anatase-TiO 2 phase. 42,43,44 The expected characteristic peak of CdS was not found in all different conditions because of the high dispersion with the quantum size effect of CdS QDs. 40,45 Nevertheless, the main diffraction peaks of TiO 2 presented slight shifts to lower 2q positions for CdS-modified TiO 2 .…”

Multi-response optimization of chromium/gold-based nanofilm Kretschmann-based surface plasmon resonance glucose sensor using finite-difference time-domain and Taguchi method

“…[8][9][10] Recently, Trejo-Tzab et al introduced a very simple way to prepare a new nanocomposite comprising N-TiO 2-x /Au/Ag for potential SPR sensor applications. 11 This work is an extension of our previous work on K-SPR sensors where we have extended the current work to include root-mean-square (RMS) surface roughness of the SPR layers as noise factor as well as optimizing multi-responses of the full-width-at-halfmaximum (FWHM), minimum reflectivity (R min ), and sensitivity of the K-SPR sensor. 12 As in previous work, Taguchi method was used in this study to identify the optimum parameters that will produce a robust high-sensitivity multi-response Au nanofilm K-SPR glucose sensor.…”