Preparation and characterization of silver nanoparticles homogenous thin films

Abstract

The wet chemical method by metal salt reduction has been widely used to synthesize nanoparticles. Accordingly the silver nitrate used as silver precursor and sodium borohydrate as reduction agent. The silver nanoparticles were characterized by different characterization techniques including UV-VIS spectrometry, Transmission electron microscope (TEM), and Zeta potential technique. Thin films of the colloidal solution were fabricated using direct precipitation technique on ITO glass, silicon substrate and commercial glass substrate and characterized by imaging technique. The absorption peak of the silver nanoparticles colloidal solution was around 400 nm. The TEM images indicate that the silver nanoparticles had spherical shape and their sizes were from 10 to 17 nm. The particle size of the silver nanoparticles was confirmed by Zeta potential technique. The imaging technique indicated that the homogeneous distribution of the colloidal silver solution thin film on the silicon substrate was stronger than the ITO glass and inhomogeneous film was emerged on the commercial glass.

Synthesis and deposition of silver nanoparticles on porous titanium substrates for biomedical applications

“…Furthermore, the confidence interval (lower and upper limits) has been calculated, which means that the proportion of samples of a given size that may be expected to contain the mean value, in our case for the 95 % (Figure 5 and Table 2). These results were in concordance with previously reported works in which the important role of the temperature and the NaBH 4 concentration was highlighted in order to control de nanoparticle size [40][41][42]. However, those synthesized by route B were spherical with main average diameter around three time smaller, 5.6 nm and standard deviation of 2.9 nm (Figure 5 and Table 2).…”

Bioactive Carboxymethyl Cellulose (CMC)-Based Films Modified with Melanin and Silver Nanoparticles (AgNPs)—The Effect of the Degree of CMC Substitution on the In Situ Synthesis of AgNPs and Films’ Functional Properties

“…As mentioned in the SEM imaging section, the silver nanoparticles obtained with melanin showed sizes between 8.5 and 14.5 nm on average. These sizes are in line with literature data on the antimicrobial properties of silver nanoparticles [ 23 , 30 , 44 , 46 , 66 , 67 ]. As was proven by Hebeish et al, as the degree of CMC substitution increases, the dispersion of silver nanoparticles increases [ 37 ], and consequently they exhibit an ever-increasing lethal effect against microorganisms.…”

PEI/Ag as an Optical Gas Nano-Sensor for Intelligent Food Packaging

“…Therefore, the maximum Ag NPs concentration occurs after 30 minutes of exposure to 0.01 M of 2-ME and after 180 minutes for 0.005 M 2-ME. The absorbance intensity increases for all tested wavelengths, indicating thereby the presence of rather a broad absorption band spectrum, due to a broad NPs size distribution and the presence of large particles (> 100 nm) [10], [12]. NPs size distribution could be also analyzed from the color change of the PEI/Ag once it reacted with 2-ME.…”