Direct Synthesis of Gallium Oxide Tubes, Nanowires, and Nanopaintbrushes

Abstract

We demonstrate bulk synthesis of highly crystalline beta-gallium oxide tubes, nanowires, and nanopaintbrushes using molten gallium and microwave plasma containing a mixture of monatomic oxygen and hydrogen. Gallium oxide nanowires were 20-100 nm thick and tens to hundreds of micrometers long. Transmission electron microscopy (TEM) revealed the nanowires to be highly crystalline and devoid of any structural defects. Results showed that multiple nucleation and growth of gallium oxide nanostructures could easily occur directly out of molten gallium exposed to an appropriate composition of hydrogen and oxygen in the gas phase. These gallium oxide nanostructures should be of particular interest for optoelectronic devices and catalytic applications.

Growth and luminescence properties of micro- and nanoneedles in sintered CdSe

“…Fabrication and characterization of low-dimensional elongated semiconductor structures such as nanowires, nanotubes, or nanorods is a subject of increasing interest due to their potential use in future nanoelectronics systems or other technological applications. Fabrication and properties of such nanostructures of different semiconductors as, for instance, ZnO, 1-5 Si, 6 TiO 2 , 7 SnO 2 , 8,9 Ga 2 O 3 , 10,11 have been reported in the past years. Thermal evaporation of the semiconductor powder and deposition on a substrate under a gas flow is the most widely reported method to grow elongated structures.…”

High-pressure behavior of β-Ga2O3 nanocrystals

“…[1][2][3][4][5] Recently, considerable effort has been devoted to the study of nanostructured ␤-Ga 2 O 3 because of the potential for applications in nanodevices. [6][7][8][9][10] In ambient conditions, monoclinic ␤-Ga 2 O 3 is the thermodynamically stable form and there are other four metastable structures: ␣-, ␥-, ␦-, and -Ga 2 O 3 . 11 Different forms have different physical properties.…”

Growth and luminescence properties of micro- and nanotubes in sintered tin oxide

“…For instance, nanowires, nanoribbons, and nanotubes of Ga 2 O 3 and TiO 2 have been synthesized by different methods. [6][7][8][9] However, there are only few reports on the fabrication of similar structures of SnO 2 , which is known to be an important material for gas sensors and optoelectronic devices. Dai et al 10 have synthesized long single-crystalline SnO 2 nanoribbons by thermal evaporation of SnO and SnO 2 powders at high temperature.…”