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Structural and morphological transformations of Zn–Al layered double hydroxides through hydrothermal treatment

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Abstract.
The Zn–Al layered double hydroxides (LDH) with Zn/Al molar ratio of 2 were prepared by
coprecipitation, followed by hydrothermal treatment at various hydrothermal conditions. The phase
transformation was observed, accompanied by drastical morphological changes. As the results indicated,
in aqueous system the decomposition product was phase segregated into wurtzite ZnO and spinel
ZnAl2O4 by dissolution of the precursor hydroxide followed by recoprecipitation of the oxide phases. As a
single-source precursor, LDH facilitated the formation of ZnAl2O4 crystallites and their coating on ZnO
nanowires via the inherent linkage through interactions of coordination as well as hydrogen bonding via
medium of surface –OH on particles. The addition of ethanol with high vapor tension and low polarity
was against the adsorptive attachment of ZnAl2O4 on ZnO but in favor of the crystallization and size
decrease of the resulting oxides. Improved crystallization in LDH precursors was beneficial to intensify
the interactions to overcome the breaking effect of ethanol, achieving better coating of ZnAl2O4 on ZnO.
With the silane grafting of KH570, hydrothermal treatment promoted the formation of four phases by
partial decomposition of layered structure of ZnAl–CO3 and new emergence of smectite-like materials
with basal spacing of 12.35A˚ . As the aging time for LDH precursors gradually elongated, the whole
products finally transformed to ultrafine nanorods with mean size of 50 nm in length which were
segregated without any type of attachment.

Keywords: Layered double hydroxides, Solution decomposition, KH570, Hydrothermal treatment

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Informasi Detail

Judul Seri

Applied Surface Science

No. Panggil

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Penerbit

London : Elsevier B.V.., 2009

Deskripsi Fisik

Applied Surface Science 255 (2009) 6372–6377

Bahasa

English

ISBN/ISSN

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Klasifikasi

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Tipe Isi

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Tipe Media

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Tipe Pembawa

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Edisi

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Subjek

KIMIA

Info Detail Spesifik

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Pernyataan Tanggungjawab

agus

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