We report a novel wet-chemical approach at 180 degrees C for the synthesis of monodispersed ZnO nanorods with high single-crystallinity. The method has successfully brought nanorod diameter from reported 150 nm down to 50 regime in this work. aspect ratio synthesized achieved is exceptionally (in range 30-40). This simple low-cost should promise us future large-scale nanostructures many important applications nanotechnology controlled manner.

In this work, we report a simple "one pot" approach to prepare hollow anatase TiO2 nanospheres via Ostwald ripening under hydrothermal conditions. Inner nanospace and highly organized crystallites in the shell structure surface regions can be created with wide range of controlling parameters. The formation mechanism has been investigated TEM/ED/SEM/EDX/XRD/XPS methods. shows high versatility for structural engineering various targeted morphological products, including inner material refills.

A two-tiered organizing scheme with multiple-length scales for construction of dandelion-like hollow CuO microspheres has been elucidated: (1) mesoscale formation rhombic building units from smaller nanoribbons via oriented aggregation and (2) macroscopic organization these into the microspheres. This self-assembly concept may also be applicable to other metal oxides by creating geometric constraints constructional units.

Abstract Two methodic concepts, symmetric and asymmetric Ostwald ripening, are elucidated by solution‐route syntheses of oxide sulfide semiconductors. While the original shape a crystallite aggregate forms exterior appearance, preorganization crystallites determines ultimate interior space structure upon ripening. Further investigations on design control solution process will allow construction complex architectures, including nonspherical configurations.

Abstract In this work, a novel hydrothermal route is developed to synthesize cobalt carbonate hydroxide, Co(CO 3 ) 0.5 (OH)·0.11H 2 O. method, sodium chloride salt utilized organize single‐crystalline nanowires into chrysanthemum‐like hierarchical assembly. The morphological evolution process of organized product investigated by examining different reaction intermediates during the synthesis. growth and thus final assembly O can be finely tuned selecting preparative parameters, such as molar...

We report that in addition to the fabrication of hollow nanomaterials, Kirkendall-type diffusion can also be utilized synthetic nanoarchitecture, through which low-dimensional nanobuilding blocks designed and organized chemically into complex geometrical conformations. Our approach may provide a new chemical alternative materials self-organization. In principle, great variety inorganic "dandelions" their nanocomposites tailored fabricated this type total architecture.

The well-known physical phenomenon Ostwald ripening in crystal growth has been widely employed template-free fabrication of hollow inorganic nanostructures recent years. Nevertheless, all reported works so far are limited only to stoichiometric phase-pure solids. In this work we describe the first investigation doped (nonstoichiometric) materials using as a means creating interior space. particular, chose xSnO2−(1 − x)TiO2 binary system establish preparative principles for approach synthesis...

The preparation of SnO2 nanotubes with coaxially grown carbon nanotube overlayers good conformal control shape and size is reported. SnO2-core/carbon-shell (see Figure) are excellent reversible lithium-ion storage compounds combining the best features (for cyclability) capacity). These structures deliver high specific capacity (∼ 540–600 mA h g–1) cyclability (0.0375% loss per cycle).

In this work, we demonstrate that cuprous oxide Cu2O nanospheres with hollow interiors can be fabricated from a reductive conversion of aggregated CuO nanocrystallites without using templates. A detailed process mechanism has been revealed: (i) formation nanocrystallites; (ii) spherical aggregation primary crystallites; (iii) to Cu2O; and (iv) crystal aging hollowing nanospheres. template-free process, Ostwald ripening is operative in for controlling crystallite size shell structures thus...

One of the major technological challenges in nanoscience and nanotechnology is self-assembly tiny nano-building units (e.g., nanokits nanoparts) into larger (i.e., mesoscale or microscale) organized conformations geometrical architectures for device applications. To meet requirements new applications, an interior space nanostructures may be further required. When coupled with chemical functionality boundary materials, "nanospace" possesses both aesthetic beauty scientific attraction. For...

0D→2D→3D oriented attachment has been exploited to prepare octahedra of rutile-like SnO2 with a central cavity by template-free hydrothermal route. The synthesis is based on the two-dimensional nanocrystallites and stabilization family {111}-like crystal planes in 2-propanol/water presence ethylenediamine. In TEM images octahedron (see picture), evidenced lighter regions. Supporting information for this article available WWW under http://www.wiley-vch.de/contents/jc_2002/2004/z461129_s.pdf...

In this work we demonstrated that uniform polycrystalline SnO2 nanotubes, in either array or free-standing form, can be fabricated by an infiltration technique using nanoparticles as starting building units. With method, the diameter, length, thickness, and texture of nanotubes further controlled. The tubular shows a significant improvement electrochemical performance over unorganized nanoparticles. specific capacity Sn-based nanotube electrode was 525 mAh/g after 80 cycles. principle,...

In this work, a template-free synthetic approach for generating single-crystalline hollow nanostructures has been described. Using the small optical band-gap cuprous oxide Cu2O as model case, we demonstrate that, instead of normally known spherical aggregates, primary nanocrystalline particles can first self-aggregate into porous organized solids with well-defined polyhedral shape according to oriented attachment mechanism, during which chemical conversion also be introduced. contrast where...

Carbon nanotubes (CNTs)-based composites have attracted significant research interest in recent years, owing to their important applications various technological fields. In this investigation, we describe a general approach make CNTs-based nanocomposites via self-assembly. The method allows one prepare binary as well complex systems such ternary or even quaternary where nanoparticles of active phases (e.g., metals and metal oxides) are used primary building blocks. Six different kinds...

Ag2S and Ag are important functional materials that have received considerable research interest in recent years. In this work, we develop a solution-based synthetic method to combine these two into hollow/solid Ag2S/Ag heterodimers at room temperature. Starting from monodisperse Cu2O solid spheres, CuS hollow spheres can be converted through modified Kirkendall process, the obtained then used as precursor for preparation of ion exchange photo-assisted reduction. We found formation is...

Fabrication of nanomaterials with hollow interiors is an important research area in nanoresearch, owing to their potential applications photonic devices, drug delivery, material encapsulation, ionic intercalation, surface functionalization, nanocatalysts, membrane nanoreactors, and many other technologies. The common preparative methods for this new class materials can be broadly divided into hard soft template-assisted syntheses. In recent years, furthermore, the interest template-free...

In recent years, nanostructured materials with interior cavities and surface porosity have received extensive interest in the research community, owing to their many important applications emerging technologies. Among synthetic strategies, Ostwald ripening has become a direct matter-relocation approach create spaces for this class of new functional materials. short article, we review general processes various types crystalline noncrystalline materials, as well stoichiometric...

Bottom-up fabrication of complex 3D hollow superstructures from nonspherical building blocks (BBs) poses a significant challenge for scientists in materials chemistry and physics. Spherical colloidal silica or polystyrene particles are therefore often integrated as BBs the preparation an emerging class materials, namely colloidosomes (using Pickering stabilization fusing them to form permeable shell). Herein, we describe first time one-step emulsion-based technique that permits assembly...

In this work, we describe a solution-based synthesis of monodisperse Cu2O nanocrystals with controllable sizes in the nanoscale regime. Two types nanocrystals, cubes and rhombic dodecahedra unifaceted either {001} or {110} crystal planes, have been prepared at 100% morphological yield. particular, synthetic parameters formation processes investigated detail, range well-oriented supercrystals/superlattices built from two nanobuilding blocks attained for first time. It has revealed that...

Synthesis of metal–organic frameworks (MOFs) is based on coordination‐driven self‐assembly metal ions and organic ligands. However, to date, it remains difficult adjust the coordination behaviors MOFs then control geometric shapes nanostructures; especially their morphologies in 1D nanofibers or 2D nanosheets have seldom been explored. Here, a facile route at room temperature ambient pressure reported for preparation copper‐based with low‐dimensional (i.e., nanofibers, nanorods, nanosheets,...

Abstract In-plane sulfur vacancies (Sv) in molybdenum disulfide (MoS 2 ) were newly unveiled for CO hydrogenation to methanol, whereas edge Sv found facilitate methane formation. Thus, selective exposure and activation of basal plane is crucial methanol synthesis. Here, we report a mesoporous silica-encapsulated MoS catalysts with fullerene-like structure atomic copper (Cu / @SiO ). The main approach based on physically constrained topologic conversion dioxide (MoO within silica. spherical...

A conductive hydrogel is widely used in flexible electronics, strain sensors, and energy harvesting. However, poor mechanical property, low sensitivity, slow response time limit their application sensors triboelectric nanogenerators (TENG). In order to address these issues, using polyacrylamide (PAM), cellulose nanofibers (CNF), MXene composites as preparation materials, an electrohydrodynamic (EHD) printing method assisted in-situ photopolymerization proposed fabricate a PAM/CNF/MXene (PCM)...