Stabilizer-free nanosized gold sols

Andreescu, Daniel; Sau, Tapan K.; Goia, Dan V.

doi:10.1016/j.jcis.2006.01.011

Cited by 97 publications

(58 citation statements)

References 52 publications

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“…The 0.005 mol each of M(NO3)2 (M = Ca, Sr and Ba) and Na2WO4 were separately dissolved in 15 cm 3 propylene glycol (boiling point = 187°C 17) ), correspondingly mixed and stirred for 1.8 × 10 3 s (30 min). Dielectric constant (relative permittivity) and dielectric loss for 2.45 GHz of propylene glycol at 25°C are 30.2 and 6.3, respectively; 18) therefore, it is highly susceptible to microwave radiation.…”

Section: Methodsmentioning

confidence: 99%

Cyclic microwave-assisted synthesis and characterization of nano-crystalline alkaline earth metal tungstates

Phuruangrat

Thongtem

2008

J. Ceram. Soc. Japan

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Nano-crystalline MWO4 (M = Ca, Sr and Ba) were successfully produced using cyclic microwave radiation in propylene glycol. XRD, TEM, SAED and EDX analyses revealed the presence of nano-crystalline MWO4 containing the corresponding alkaline earth metals, W and O. Their lattice parameters and crystallite sizes were determined, and enlarged with the increase in the ionic radii of the corresponding divalent metals. Six different vibrations were detected using Raman spectroscopy and very strong W-O stretching of [WO4] 2-tetrahedrons using FTIR.

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Section: Methodsmentioning

confidence: 99%

Cyclic microwave-assisted synthesis and characterization of nano-crystalline alkaline earth metal tungstates

Phuruangrat

Thongtem

2008

J. Ceram. Soc. Japan

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“…Of significant scientific and practical interest are stabilizers which can also act as reductants. Such compounds not only simplify the precipitation systems but also offer opportunities for developing environmentally friendly processes [42][43][44][45][46][47][48][49][50][51]. The most likely candidates for this purpose are large organic molecules containing functional groups with reducing properties.…”

Section: Introductionmentioning

confidence: 99%

Preparation and stabilization of monodisperse colloidal gold by reduction with aminodextran

Morrow

Matijević

Goia

2009

Journal of Colloid and Interface Science

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“…These results were comparable to the previous nanocube system, in which the rougher Au coating was often accomplished on preformed Ag nanocubes at a low temperature (i.e., 20°C) rather than a high temperature (i.e., 100°C) [25]. In addition to the low temperature, it is also important to remember that such rough core-shell type nanoparticles could also be affected by the presence of excess AsA, which could cause the formation of rough and partially aggregated nanoparticles [37,39,41,42]. As the amount of the K-Au solution increased, the size of the core-shell nanoparticles systematically increased, probably due to the thicker coating of the Au layer.…”

Section: Resultsmentioning

confidence: 99%

One-pot synthesis of various Ag–Au bimetallic nanoparticles with tunable absorption properties at room temperature

2013

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This report describes the formation of gold-coated silver bimetallic nanoparticles prepared by the one-pot synthetic approach which involves the subsequent reduction of silver and gold ions at ambient conditions. The reduction of silver ions by excess L-ascorbic acid initially led to the formation of silver cores. This step was followed by the addition of gold ions into the preformed cores, resulting in the formation of silver-core gold-shell type bimetallic nanoparticles at room temperature. This process systematically allowed for the formation of various bimetallic nanoparticles which exhibited tunable absorption properties corresponding to the visible and near-IR regions. The thickness of the gold shells and the diameter of the silver-core nanoparticles were readily controlled; the morphological and structural properties of the resulting bimetallic nanoparticles were thoroughly analyzed by SEM/TEM, DLS, and UV-Vis spectrophotometry. The overall results demonstrated not only that these gold-coated silver nanoparticles were reliably prepared by our one-pot synthetic approach, but also that their optical properties were tunable in the visible and near-IR areas as a function of the core size and shell thickness.

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Stabilizer-free nanosized gold sols

Cited by 97 publications

References 52 publications

Cyclic microwave-assisted synthesis and characterization of nano-crystalline alkaline earth metal tungstates

Cyclic microwave-assisted synthesis and characterization of nano-crystalline alkaline earth metal tungstates

Preparation and stabilization of monodisperse colloidal gold by reduction with aminodextran

One-pot synthesis of various Ag–Au bimetallic nanoparticles with tunable absorption properties at room temperature

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