Abstract
In the present contribution, we describe the synthesis of highly dispersed silver nanorods (NRs) of different aspect ratios using a chemical route. The shape and size of the synthesized NRs were characterized by Transmission Electron Microscopy (TEM) and UV-visible spectroscopy. Longitudinal and transverse absorptions bands confirm the rod type structure. The experimentally recorded UV-visible spectra of NRs solutions were fitted by using an expression of the extinction coefficient for rod like nano structures under the dipole approximation. Simulated and experimentally observed UV-visible spectra were compared to determine the aspect ratios (R) of NRs. The average values of R for NR1, NR2 and NR3 solutions are estimated to be 3.0 ± 0.1, 1.8 ± 0.1 and 1.2 ± 0.1, respectively. These values are in good agreement with those obtained by TEM micrographs. The silver NRs of known aspect ratios are used to study antimicrobial activities against B. subtilis (gram positive) and E. coli (gram negative) microbes. We observed that the NRs of intermediate aspect ratio (R = 1.8) have greater antimicrobial effect against both, B. subtilis (gram positive) and E. coli (gram negative). The NRs of aspect ratio, R = 3.0 has better antimicrobial activities against gram positive than on the gram negative.
Highlights
Almost fifty years ago Richard Feynman suggested that the properties of materials can be modified by miniaturization and atomic level control [1]
The antimicrobial activity of NRs of R = 1.2 at concentration 30 μl and 50 μl on gram positive bacteria is shown in Figure 4 (a) while Figure 4 (b) shows the activity NRs of R = 3.0 against gram negative bacteria
From the test results it may be concluded that silver particles with intermediate aspect ratio (R = 1.8) has high antimicrobial activity against both gram positive and gram negative microbes and it has been observed that the silver nanorods are more effective against gram positive strains compared to gram negative
Summary
Almost fifty years ago Richard Feynman suggested that the properties of materials can be modified by miniaturization and atomic level control [1]. A new scheme is applied for synthesizing well dispersed silver nanorods of different aspect ratios using chemical method. The silver nanorods of known aspect ratio were further used for studying the antimicrobial effects against B. subtilis and E. coli microbes.
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