“Four Birds with One Stone”: Synthesis of Nanostructures of ZnTe, Te, ZnAl₂O₄, and Te/ZnAl₂O₄ from a Single‐Source Precursor

Abstract

Four shape‐defined anisotropic nanostructures: Single‐crystalline nanowires of ZnTe and elemental tellurium, core–shell structures of the type Te/ZnAl2O4 (see picture), and nanotubes of zinc spinel ZnAl2O4 could selectively be produced from [Zn(TePh)2(tmeda)] (tmeda=N,N,N′,N′‐tetramethylethylenediamine) as a single‐source precursor. Porous alumina templates with a pore diameter of 25 nm were used both as shape‐defining molds and chemical reactants.

Self‐Supported Formation of Needlelike Co3O4 Nanotubes and Their Application as Lithium‐Ion Battery Electrodes

“…[10][11][12][13][14][15][16][17][18][19] For example, electrochemically prepared nano-architectured Fe 3 O 4 -Cu and Ni-Sn electrodes are shown to exhibit high rate capabilities, [16] and virus-templated Co 3 O 4 nanowires have recently been demonstrated as LIB electrodes with improved properties. [17] Although nanotubes of a wide range of materials in various types have been prepared by different strategies, [20][21][22][23][24][25][26][27] it remains a challenge to synthesize nanotubes of metal oxides with isotropic crystal structure. [20,26,27] Recently, Yang and others have prepared single-crystalline nanotubes of semiconductors (e.g., GaN and Si) and metal oxides (e.g., Fe 3 O 4 ) by using a novel "epitaxial casting" against single-crystalline nanowires.…”

“…[17] Although nanotubes of a wide range of materials in various types have been prepared by different strategies, [20][21][22][23][24][25][26][27] it remains a challenge to synthesize nanotubes of metal oxides with isotropic crystal structure. [20,26,27] Recently, Yang and others have prepared single-crystalline nanotubes of semiconductors (e.g., GaN and Si) and metal oxides (e.g., Fe 3 O 4 ) by using a novel "epitaxial casting" against single-crystalline nanowires. [24][25][26] More recently, single-crystalline spinel ZnAl 2 O 4 nanotubes have been fabricated based on the Kirkendall effect, [27] normally applied for preparation of hollow nanoparticles, [28] in which amorphous Al 2 O 3 was coated on ZnO nanowires by atomic layer deposition followed by annealing at high temperature.…”

Reactive Templates: Doing Chemistry with Pore Walls

“…[16] For example, vacuum thermolysis of Zn(TePh) 2 Á TMEDA inside self-ordered AAO with a pore diameter of 25 nm (anodized in aqueous sulfuric acid) yields single-crystalline nanowires consisting of the primary thermolysis product ZnTe (Fig. 3a) under conditions where the template is inert.…”

Simple Preparation of One-dimensional Metal Selenide Nanomaterials Using Anodic Aluminum Oxide Template

“…[12][13][14][15][16][17][18][19][20][21][22][23] Since the production of highly ordered AAO nanohole arrays was reported by Masuda and Fukuda in 1995, 12) extensive research has been devoted to the preparation of nanostructured materials using ordered AAO template. [24][25][26][27][28][29][30][31][32][33][34][35][36][37][38][39][40][41] The AAO membranes show remarkable hardness, high pore density, potentially low cost, uniform pore size, and relative ease of preparation.…”