Direct Synthesis of Alumina Nanowires on Ceramic Substrates Using Sn Catalysts

Abstract

Direct integration of nanostructures into macroscopic substrates is very important for their practical applications. In this work, we report a simple method that can be introduced for the Sn‐catalyzed growth of alumina nanowires on ceramic substrates such as porous disk, monolith, and foam. Our study focuses on the role of the Sn catalysts in the formation mechanisms governing nanowire growth. Using the proposed approach, hair‐ or grass‐like tufts of 20 nm diameter nanowires grow on the surface of the ~3 μm diameter Sn particles, in a tip growth mechanism. The nanowires of α‐phased polycrystalline structure grow and are packed via a complex process involving batch‐by‐batch, branching, and amalgamation growth. The detailed observations reveal that the Sn catalyst is key to tailoring the growth patterns of the nanowires. In addition, cathodoluminescence studies highlight the potential optical applications of the alumina nanowires.

Epitaxial growth of aluminum borate whiskers and simultaneous joining of alumina ceramics via a sol–gel method

“…Joints obtained at 950 C and held for 8 h had the optimum shear strength (84.5 MPa), where the width of the joint was less than 10 mm, both types of whiskers had single-crystal structures, and the preferential growth orientation of Al 4 Joints obtained at 950 C and held for 8 h had the optimum shear strength (84.5 MPa), where the width of the joint was less than 10 mm, both types of whiskers had single-crystal structures, and the preferential growth orientation of Al 4 …”

“…[1][2][3][4] It is difficult to manufacture alumina into complex-shaped products due to the high hardness and brittleness of the material. [1][2][3][4] It is difficult to manufacture alumina into complex-shaped products due to the high hardness and brittleness of the material.…”

Droplet assisted growth and shaping of alumina and mixed alumina-silicone 1-dimensional nanostructures

“…For the precise information about the presence of bonding between atoms of synthesized nanostructures, solid state NMR measurements were performed. 29 Si NMR is a very useful technique to accurately determine the bonding of Si with other atoms. 29 Si NMR spectra of SNFs and Al-SiNFs is shown in Figure 8.…”

“…29 Si NMR is a very useful technique to accurately determine the bonding of Si with other atoms. 29 Si NMR spectra of SNFs and Al-SiNFs is shown in Figure 8. Three peaks were observed for both SNFs and Al-SiNFs.…”

“…Al and mixed Al-Si based 1D nanostructures have been usually synthesized using various methods, e.g. hydrothermal method [27][28] or chemical vapor deposition [29] are a few examples; all of them involve application of high synthesis temperature and complex synthesis procedure. In this publication we describe for the first time the synthesis of aluminum and mixed aluminum-silicone based nanostructures using the DAGS synthesis principle.…”