Loading...
Please wait, while we are loading the content...
Similar Documents
A New Synthesis Approach and Properties of Bismuth Coated Spherical to Hexagonal Silver Nanoparticles in Dichroic Ag : Bismuth Glass Nanocomposites
| Content Provider | Semantic Scholar |
|---|---|
| Author | Singh, Shiv Prakash Karmakar, Basudeb |
| Copyright Year | 2011 |
| Abstract | Here we report for the first time, the synthesis of bismuth coated silver nanoparticles in dichroic bismuth glass nanocomposites by a novel and simple one-step melt quench technique without using any external reducing agent. The metallic silver nanoparticles (Ag NPs) were generated first and subsequently metallic bismuth was deposited on the Ag NPs and formed a thick layer. The reduction of Bi to Bi and subsequently its deposition on the Ag NPs (which were formed earlier than Bi) in the K2O-Bi2O3-B2O3 (KBB) glass system has been explained by their standard reduction potentials. The UV-vis absorption spectra show a prominent surface plasmon resonance (SPR) absorption band at 575 nm at lower concentrations (up to 0.01 wt %); three bands at 554, 609 and 780 nm at medium concentration (0.02-0.03 wt %); and two weak bands at 619 and 817 nm at highest concentration (0.06 wt %) of silver. They have been explained by the electrodynamics theories. TEM images reveal the conversion of spheroidal (5-15 nm) to hexagonal (10-35 nm) shaped Ag NPs with the increase in concentration of silver (up to 0.06 wt %). SAED pattern confirm the crystalline planes of rhombohedral bismuth and cubic silver. Thermal treatment at 360C, which is the glass transformation temperature (Tg) of the sample containing lower concentration of silver (0.007 wt %) shows red shifted SPR band due to increase in size of NPs. Where as the sample containing higher concentration (0.06 wt %) of silver under similar treatment |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | http://cgcri.csircentral.net/355/3/SPS-Plasmonics.pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
