Controlled Growth of Silver Oxide Nanoparticles on the Surface of Citrate Anion Intercalated Layered Double Hydroxide

Abstract

Silver oxide nanoparticles with controlled particle size were successfully obtained utilizing citrate-intercalated layered double hydroxide (LDH) as a substrate and Ag+ as a precursor. The lattice of LDH was partially dissolved during the reaction by Ag+. The released hydroxyl and citrate acted as a reactant in crystal growth and a size controlling capping agent, respectively. X-ray diffraction, X-ray photoelectron spectroscopy, and microscopic measurements clearly showed the development of nano-sized silver oxide particles on the LDH surface. The particle size, homogeneity and purity of silver oxide were influenced by the stoichiometric ratio of Ag/Al. At the lowest silver ratio, the particle size was the smallest, while the chemical purity was the highest. X-ray photoelectron spectroscopy and UV-vis spectroscopy results suggested that the high Ag/Al ratio tended to produce silver oxide with a complex silver environment. The small particle size and homogeneous distribution of silver oxide showed advantages in antibacterial efficacy compared with bulk silver oxide. LDH with an appropriate ratio could be utilized as a substrate to grow silver oxide nanoparticles with controlled size with effective antibacterial performance.

A label-free and selective SERS-based sensor for determination of ampicillin contamination in water using a fabric gold–silver alloy substrate with a handheld Raman spectrometer

“…76-1393). 35 The characteristic diffraction peaks of cotton-based fabric were reported to be at 2 θ = 14.36°, 16.36°, 22.60° and 33.98°, which were assigned to cellulose I of the cotton fabric. 36…”

“…76-1393). 35 The characteristic diffraction peaks of cotton-based fabric were reported to be at 2y = 14.361, 16.361, 22.601 and 33.981, which were assigned to cellulose I of the cotton fabric. 36 From our study, the XRD pattern of playdough obviously existed for all samples as seen as the gray label in Fig.…”

Nanosilver-loaded metal–organic framework UiO-66 with strong fungicidal activity

“…This mechanism of Ag 2 O generation is similar to that observed in solids containing OH − groups in their structure which in contact with a silver nitrate solution form Ag + OH − adducts and produce Ag 2 O at the surface. 27…”

“…In addition, an Ag 3d signal (Fig. 9a) with an Ag 3d 5/2 component at 367.4 eV typical of oxidized silver species, 10,27 was observed. Further relevant information of the XPS analyses came from the spectrum in the O 1s region (Fig.…”

“…This mechanism of Ag 2 O generation is similar to that observed in solids containing OH − groups in their structure which in contact with a silver nitrate solution form Ag + OH − adducts and produce Ag 2 O at the surface. 27 The silver-impregnated UiO-66 obtained with citrate showed a smaller Ag 2 O crystallite size (Table 1), while as R decreased the pH of the impregnation solution progressively increased thus originating a decrease in the relative crystallinity of the MOF as well as in the mass of the recovered solid. This is because when the pH of the solution became higher than 7.7, a destabilization of the UiO-66 structure began.…”