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Large‐Scale Synthesis of Single‐Crystalline RE 2 O 3 (RE=Y, Dy, Ho, Er) Nanobelts by a Solid–Liquid‐Phase Chemical Route
Author(s) -
Han Min,
Shi NaiEn,
Zhang WenLi,
Li BaoJun,
Sun JianHua,
Chen KunJi,
Zhu JianMing,
Wang Xin,
Xu Zheng
Publication year - 2008
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.200700808
Subject(s) - selected area diffraction , transmission electron microscopy , materials science , crystallography , crystallinity , powder diffraction , yttrium , high resolution transmission electron microscopy , scanning electron microscope , nucleation , analytical chemistry (journal) , oxide , chemical engineering , chemistry , nanotechnology , organic chemistry , engineering , metallurgy , composite material
Yttrium‐group heavy rare‐earth sesquioxide (RE 2 O 3 , RE=Y, Dy, Ho, Er) nanobelts were successfully fabricated by thermolysis of solid RE(NO 3 ) 3 ⋅ x H 2 O in a dodecylamine/1‐octadecene mixed solvent system. The synthetic principle is based on separating the nucleation and growth processes by utilizing the poor solubility of RE(NO 3 ) 3 ⋅ χ H 2 O in the solvent mixture and the heat‐transportation difference between the liquid and solid. By using dodecylamine, RE 2 O 3 nanobelts can be readily obtained. X‐ray diffraction (XRD) analysis shows that the synthesized RE 2 O 3 nanobelts are body‐centered cubic and crystalline. Field‐emission scanning electron microscopy (FE‐SEM), transmission electron microscopy (TEM), selective‐area electron diffraction (SAED), and high‐resolution transmission electron microscopy (HR‐TEM) demonstrate that the synthesized RE 2 O 3 compounds possess regular geometric structure (beltlike) with perfect crystallinity. Preliminary experimental results prove that the dodecylamine plays a key role in the formation of RE 2 O 3 nanobelts and cannot be replaced by other surfactants. Furthermore, this method can be extended to the synthesis of RE 2 O 3 nanobelt/metal nanocrystal nanocomposites and ABO 3 (A=Y, Dy, Ho, Er; B=Al) and A 3 B 5 O 12 (A=Y, Dy, Ho, Er; B=Al)‐type ternary oxide nanobelts, using mixed‐metal nitrate salts in the correct stoichiometry instead of single rare‐earth nitrates.