Phase Control and Formation Mechanism of New-Phase Layer-Structured Rhombohedral In3Se4 Hierarchical Nanostructures

作者：Han Guang; Chen Zhi Gang^*; Yang Lei; Cheng Lina; Drennan John; Zou Jin

来源：Crystal Growth & Design, 2013, 13(11): 5092-5099.

DOI：10.1021/cg401269p

New layer-structured rhombohedral In3Se4 hierarchical nanostructures, assembled by thin nanosheets with a thickness of similar to 20 nm, are controllably synthesized by an ethylenediaminetetraacetic acid (EDTA) and ascorbic acid (AA) assisted solvothermal method in a solvent of deionized water (DIW) and ethylene glycol (EG). Detailed structural and chemical characterizations, using transmission electron microscopy and X-ray diffraction with Rietveld refinement, reveal that the new In3Se4 phase crystallizes in a layered rhombohedral structure (space group: R (3) over barm) with lattice parameters of a = 3.962 +/- 0.001 angstrom and c = 39.59 +/- 0.01 angstrom and with layers consisting of Se-In-Se-In-Se-In-Se. Through systematic investigation, the key synthesis parameters, namely, the EDTA/In mole ratio, DIW/EG volume ratio, AA dosage, and reaction temperature, are found to play vital roles in the formation of such rhombohedral hierarchical nanostructures. The investigation of intermediate products shows that the In3Se4 hierarchical nanostructures are formed by the reaction between Se microspheres and In precursors. This study provides a key method to large-scale fabrication of such a new In3Se4 phase for potential applications.

• 出版日期2013-11