Low-dimensional Nanomaterials Research Articles

Self-assembly and properties of low-dimensional nanomaterials based on π-conjugated organic molecules

Abstract Building supramolecular architectures with well-defined shapes and functions is of great importance in materials science, nanochemistry, and biomimetic chemistry. In recent years, we have devoted much effort to the construction of well-defined supramolecular structures through noncovalent forces such as hydrogen bonding, π-stacking, metal-ligand bonds, and hydrophilic and hydrophobic interactions, with the aid of functional building blocks. The morphologies and their physical properties were studied, and new methods for the construction of one-dimensional nanoscale structures have been developed. In this review, we summarize our recent studies on the design and synthesis of the supramolecular systems, as well as the physical properties of nanoscale structures.

Self-assembled low-dimensional nanomaterials via low-temperature plasma processing

Examples of successful fabrication of low-dimensional semiconducting nanomaterials in the Integrated Plasma-Aided Nanofabrication Facility are shown. Self-assembled size-uniform ZnO nanoparticles, ultra-high-aspect ratio Si nanowires, vertically aligned cadmium sulfide nanostructures, and quarternary semiconducting SiCAlN nanomaterial have been synthesized using inductively coupled plasma-assisted RF magnetron sputtering deposition. The observed increase in crystallinity and growth rates of the nanostructures are explained by using a model of plasma-enhanced adatom surface diffusion under conditions of local energy exchange between the ion flux and the growth surface. Issues related to plasma-based growth of low-dimensional semiconducting nanomaterials are discussed as well.

Silicon‐Based Low‐Dimensional Nanomaterials and Nanodevices

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Classification and Representations of Low-Dimensional Nanomaterials: Terms and Symbols

A simple scheme, with special terms and symbols useful in categorizing various nanostructures, is introduced. Using “n-D in/on m-D” composite nanomaterials where n,m ≤ 2 as examples, we illustrate how these terms and symbols can be used to represent various hetero nanostructures. This simple nomenclature system also allows a systematization of a wide variety of multi-dimensional nanocomposite heterostructures.

Silicon-Based Low-Dimensional Nanomaterials and Nanodevices

Silicon-Based Low-Dimensional Nanomaterials and Nanodevices

One-Dimensional Oxide Nanomaterials through Rheological Self-Assembling

This article introduces a process for the growth of one-dimensional oxide nanomaterials that combines rheological phase reaction and hydrothermal self-assembling process. Fundamentals and practical approaches of hydrothermal self-assembling process and rheological phase reaction are briefly described. Particular attention is devoted to the rheological self-assembling for the growth of low dimensional oxide nanomaterials. Many examples are shown that the rheological self-assembling is an effective method to prepare one-dimensional nanomaterials, organic-inorganic hybrids and 1-D nanomaterial array for optical-electronic and electrochemical devices and catalysis. Morphologies, microstructures, properties, and application of one-dimensional oxide nanomaterials are reviewed.

Catalyst-Assisted Pyrolysis of Polymeric Precursors: A New Method to Synthesize Low-Dimensional Nanomaterials

Catalyst-Assisted Pyrolysis of Polymeric Precursors: A New Method to Synthesize Low-Dimensional Nanomaterials

Controlled Al-Doped Single-Crystalline Silicon Nitride Nanowires Synthesized via Pyrolysis of Polymer Precursors

Al-doped single-crystalline Si(3)N(4) nanowires were synthesized by catalyst-assisted pyrolysis of polymeric precursors. The doping levels can be controlled by tailoring the Al concentration in the precursors. It is found that the Al concentration has a significant effect on the shape, sizes, and phase compositions of the synthesized Si(3)N(4) low-dimensional nanomaterials. The photoluminescence measurements revealed that the Al dopants have a profound effect on the emission behavior. The current study provides a simple way to realize the controlled doping in Si(3)N(4) nanomaterials, which could be useful for applications in optoelectronic nanodevices.

Recent advances in hydrothermal syntheses of low dimensional nanoarchitectures

Recently, considerable attention has been focused on low-dimensional nanomaterials owing to their unique physical properties and potential applications in sensors, magnetics, electric transportation, optics, and even as building blocks for nanoscale devices. The past couple of decades have witnessed the development on new mild soft solution based strategies for fabrication of low dimensional nanostructures. In particular, hydrothermal synthesis, as a traditional method but a good choice, has provided various general routes for the rational synthesis of a variety of low dimensional nanostructured materials such as nanorods, nanowires, nanosheets, nanotubes, and their assemblies with controllable size, shape, phase, length scale, and structural complexity. This review gives an overview of recent advances in hydrothermal syntheses of low dimensional nanoarchitectures. Recent progresses undoubtedly emphasise that a rich family of inorganic nanostructures can be accessible by this facile approach and their shape, size, and structures can be controlled. However, hydrothermal synthesis for rational design of nanomaterials is still at its infancy and far beyond its maturity even though this traditional approach has been studied for many years. The further understanding of the reaction kinetics and formation mechanics in this reaction system by taking advantage of various characterisation techniques will make this route become a mature and reliable technique in future for the rational design of diverse nanomaterials with expected well-defined shapes, sizes, phases, and compositions, and even with unique structural specialty and complexity. These new nanobuilding blocks of different functionalities will find potential applications in nanoscience and nanotechnology.

Chromate Nanorods/Nanobelts: General Synthesis, Characterization, and Properties

A general synthesis route to a family of single-crystal chromate nanorods/nanobelts has been established. The effects of pH and surfactant on phase and morphology of these microcrystalline materials have been investigated. The physical properties of the as-synthesized chromate nanocrystals such as dielectric, electrochemical, UV-vis absorbance, and photoluminescent properties have also been studied. The present general synthesis of various low-dimensional chromate nanomaterials provides useful information on the possible synthesis of other microcrystalline transition metal oxysalts.

Different morphology at different reactant molar ratios: synthesis of silver halide low-dimensional nanomaterials in microemulsions

A simple method is introduced to prepare silver halide low-dimensional nanomaterials in water/oil (W/O) microemulsions. AgCl, AgBr nanoparticles and AgI nanoparticles/nanorods/nanowires are respectively synthesized. The reactant molar ratio plays an important role on the morphology of AgI nanomaterials. The possible reasons are tentatively discussed here.

Synthesis and Raman scattering of GaN nanorings, nanoribbons and nanowires

Low-dimensional GaN materials, including nanorings, nanoribbons and smooth nanowires have been synthesized by reacting gallium and ammonia using Ag particles as a catalyst on the substrate of MgO single crystals. They were characterized by field emission scanning electron microscopy (FE-SEM), energy dispersive X-ray spectroscopy (EDX) and X-ray diffraction (XRD). EDX, XRD indicated that the low-dimensional nanomaterials were wurtzite GaN. New features are found in Raman scatterings for these low-dimensional GaN materials, which are different from the previous observations of GaN materials.