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Growth and structure analysis of tungsten oxide nanorods using environmental TEM.

Tokunaga T, Kawamoto T, Tanaka K, Nakamura N, Hayashi Y, Sasaki K, Kuroda K, Yamamoto T - Nanoscale Res Lett (2012)

Bottom Line: The initial growth of the nanorods did not consist of tungsten oxide but rather crystal tungsten.The formed crystal tungsten nanorods were then oxidized, resulting in the formation of the tungsten oxide nanorods.Furthermore, it is expected that the nanorods grew through cracks in the natural surface oxide layer on the tungsten wire.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Quantum Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi, 464-8603, Japan. t.tokunaga@numse.nagoya-u.ac.jp.

ABSTRACT
WO3 nanorods targeted for applications in electric devices were grown from a tungsten wire heated in an oxygen atmosphere inside an environmental transmission electron microscope, which allowed the growth process to be observed to reveal the growth mechanism of the WO3 nanorods. The initial growth of the nanorods did not consist of tungsten oxide but rather crystal tungsten. The formed crystal tungsten nanorods were then oxidized, resulting in the formation of the tungsten oxide nanorods. Furthermore, it is expected that the nanorods grew through cracks in the natural surface oxide layer on the tungsten wire.

No MeSH data available.


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Environmental TEM images of the growing WO3 nanorod observed from [100] (a) and [010] (b).
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Figure 5: Environmental TEM images of the growing WO3 nanorod observed from [100] (a) and [010] (b).

Mentions: Environmental TEM images of the growing WO3 nanorod observed from [100] and [010] to reveal the WO3 nanorod middle growth mechanism are shown in Figure 5. Steps pointed by white arrows in Figure 5a were confirmed on the edge of the nanorods; the steps grew and moved to the top of the nanorods, as observed from the [100] direction in Figure 5a. The steps were not confirmed on the edge of the nanorod observed from the [010] direction. Instead, a changing contrast line marked by white arrows that gradually moved to the top of the nanorods was present, as shown in Figure 5b. This line was proposed to be the edge step of the nanorod observed from the [100] direction. These results indicate that the plane on (010) grows preferentially during WO3 nanorod growth.


Growth and structure analysis of tungsten oxide nanorods using environmental TEM.

Tokunaga T, Kawamoto T, Tanaka K, Nakamura N, Hayashi Y, Sasaki K, Kuroda K, Yamamoto T - Nanoscale Res Lett (2012)

Environmental TEM images of the growing WO3 nanorod observed from [100] (a) and [010] (b).
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3278358&req=5

Figure 5: Environmental TEM images of the growing WO3 nanorod observed from [100] (a) and [010] (b).
Mentions: Environmental TEM images of the growing WO3 nanorod observed from [100] and [010] to reveal the WO3 nanorod middle growth mechanism are shown in Figure 5. Steps pointed by white arrows in Figure 5a were confirmed on the edge of the nanorods; the steps grew and moved to the top of the nanorods, as observed from the [100] direction in Figure 5a. The steps were not confirmed on the edge of the nanorod observed from the [010] direction. Instead, a changing contrast line marked by white arrows that gradually moved to the top of the nanorods was present, as shown in Figure 5b. This line was proposed to be the edge step of the nanorod observed from the [100] direction. These results indicate that the plane on (010) grows preferentially during WO3 nanorod growth.

Bottom Line: The initial growth of the nanorods did not consist of tungsten oxide but rather crystal tungsten.The formed crystal tungsten nanorods were then oxidized, resulting in the formation of the tungsten oxide nanorods.Furthermore, it is expected that the nanorods grew through cracks in the natural surface oxide layer on the tungsten wire.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Quantum Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi, 464-8603, Japan. t.tokunaga@numse.nagoya-u.ac.jp.

ABSTRACT
WO3 nanorods targeted for applications in electric devices were grown from a tungsten wire heated in an oxygen atmosphere inside an environmental transmission electron microscope, which allowed the growth process to be observed to reveal the growth mechanism of the WO3 nanorods. The initial growth of the nanorods did not consist of tungsten oxide but rather crystal tungsten. The formed crystal tungsten nanorods were then oxidized, resulting in the formation of the tungsten oxide nanorods. Furthermore, it is expected that the nanorods grew through cracks in the natural surface oxide layer on the tungsten wire.

No MeSH data available.


Related in: MedlinePlus