Pal, Sudipto and De, Goutam (2007) Oriented Au-Cu nanoalloy particle incorporated SiO(2) films using a new layer by layer deposition technique. JOURNAL OF MATERIALS CHEMISTRY, 17 (5). pp. 493-498. ISSN 0959-9428

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Oriented Au-Cu nanoalloys have been generated in SiO(2) films using a new two-layer (TL) coating approach. Two successive overlapping coating layers were deposited on silica glass substrate using Au- and Cu-incorporated inorganic-organic hybrid silica sols. The concentrations of the Au and Cu (3 equivalent mol% metal-97% SiO(2) in each case) in the respective layers and their individual coating thicknesses were kept similar for the generation of Au-Cu alloys of an approximate atomic ratio 1 : 1. The UV-visible and X-ray diffraction (XRD) spectra of the TL films show the formation of nanoalloys with a gradual increase of Cu content with increasing heat-treatment temperature up to 750 degrees C in 10% H(2)-90% Ar. The XRD patterns reveal that the Au and Cu gradually formed Au-Cu nanoalloys of different ratios with a < 111 > orientation. Estimation shows that the final nanoalloy composition reaches Au(0.58)Cu(0.42). The transmission electron microscope (TEM) image obtained from an Au(0.58)Cu(0.42) nanoalloy containing film shows the presence of mainly < 111 > oriented plate-like circular nanoalloys of diameter 9-14 nm. XRD and TEM confirm that the alloy formation took place mainly through the diffusion and gradual dissolution of Cu atoms onto the < 111 > planes of Au and intermediate Au-Cu nanoalloy crystals.

Item Type: Article
Subjects: Engineering Materials
Depositing User: Namita Dutta
Date Deposited: 30 Jan 2012 10:45
Last Modified: 30 Jan 2012 10:45

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