NDLI: Synthesis of stable AuAg bimetallic nanoparticles encapsulated by diblock copolymer micelles

Content Provider	Royal Society of Chemistry (RSC)
Author	Zielasek, V. Dzhardimalieva, G. I. Hartwig, A. Wöhrle, D. Pomogailo, S. I. Menezes, W. G. Bäumer, M. Thiel, K.
Copyright Year	2012
Abstract	We present a facile method for the preparation of bimetallic AuAg nanoparticles (NPs) with controlled size and composition rendering them ideally suitable for optical and catalytic applications. In analogy to methods for the generation of monometallic Au and Ag NPs, AuAg NPs were prepared inside polystyrene-b-poly(4-vinylpyridine) (PS-b-P4VP) block-copolymer micelles formed in toluene, by loading the P4VP cores of the micelles first with AgNO3 and then with HAuCl4. In contrast to the reverse sequence of loading, homogenously bimetallic AuAg particle arrays were achieved after reduction carried out in solution with hydrazine monohydrate as the reducing agent. TEM reveals that stable and spherical NPs can be prepared well separated from one another and with a narrow size distribution with diameters of ∼3 nm. The bimetallic NP composition was confirmed by energy-dispersive X-ray spectroscopy (EDX) of single NPs. The atomic ratio of Ag and Au contained in single particles is in good agreement with the relative concentrations of both metals used in the synthesis which was confirmed by atomic absorption spectroscopy. The atomic ratio Au : Ag was systematically varied between 3 : 1 and 1 : 3. For all ratios UV-vis spectra showed a single plasmon band. Its wavelength varied from 430 for Au : Ag = 1 : 3 to 515 nm for Au : Ag = 3 : 1, showing a linear dependence on the relative amount of gold within the range of plasmon wavelengths from monometallic gold (538 nm) to silver (415 nm).
Starting Page	1658
Ending Page	1664
Page Count	7
File Format	HTM / HTML PDF
ISSN	20403364
Volume Number	4
Issue Number	5
Journal	Nanoscale
DOI	10.1039/c2nr11082b
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	NP Transmission electron microscopy Energy-dispersive X-ray spectroscopy Atomic absorption spectroscopy Toluene Hydrazine Reducing agent Correlation and dependence Wavelength
Content Type	Text
Resource Type	Article
Subject	Nanoscience and Nanotechnology

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