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Carbon-assisted growth and high visible-light optical reflectivity of amorphous silicon oxynitride nanowires.

Zhang L, Shi T, Tang Z, Liu D, Xi S, Li X, Lai W - Nanoscale Res Lett (2011)

Bottom Line: The obtained nanowires were attractive for their exceptional whiteness, perceived brightness, and optical brilliance.These nanowires display greatly enhanced reflection over the whole visible wavelength, with more than 80% of light reflected on most of the wavelength ranging from 400 to 700 nm and the lowest reflectivity exceeding 70%, exhibiting performance superior to that of the reported white beetle.Intense visible photoluminescence is also observed over a broad spectrum ranging from 320 to 500 nm with two shoulders centered at around 444 and 468 nm, respectively.

View Article: PubMed Central - HTML - PubMed

Affiliation: Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan 430074, China. zirong@mail.hust.edu.cn.

ABSTRACT
Large amounts of amorphous silicon oxynitride nanowires have been synthesized on silicon wafer through carbon-assisted vapor-solid growth avoiding the contamination from metallic catalysts. These nanowires have the length of up to 100 μm, with a diameter ranging from 50 to 150 nm. Around 3-nm-sized nanostructures are observed to be homogeneously distributed within a nanowire cross-section matrix. The unique configuration might determine the growth of ternary amorphous structure and its special splitting behavior. Optical properties of the nanowires have also been investigated. The obtained nanowires were attractive for their exceptional whiteness, perceived brightness, and optical brilliance. These nanowires display greatly enhanced reflection over the whole visible wavelength, with more than 80% of light reflected on most of the wavelength ranging from 400 to 700 nm and the lowest reflectivity exceeding 70%, exhibiting performance superior to that of the reported white beetle. Intense visible photoluminescence is also observed over a broad spectrum ranging from 320 to 500 nm with two shoulders centered at around 444 and 468 nm, respectively.

No MeSH data available.


SEM and TEM images of Si-O-N nanowires. (a) A typical SEM image of the as-grown Si-O-N nanowires. (b) A typical TEM image of Si-O-N nanowires.
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Figure 1: SEM and TEM images of Si-O-N nanowires. (a) A typical SEM image of the as-grown Si-O-N nanowires. (b) A typical TEM image of Si-O-N nanowires.

Mentions: Figure 1a, b shows the typical SEM and TEM images of nanowires on a Si substrate, respectively. The diameter of the nanowires is ranging from 50 to 150 nm, and the length is about 100 μm. Splitting phenomena of nanowires are observed, where a three-branch structure with the same diameter is demonstrated in Figure 1b. The observation is different from the report by L. Gu et al., in which the diameter of the splitted branches is usually smaller than that of the trunk [15]. The individual branches here can be differentially chemically functionalized and terminated to create complex multiple chemical sensors in one unit [17].


Carbon-assisted growth and high visible-light optical reflectivity of amorphous silicon oxynitride nanowires.

Zhang L, Shi T, Tang Z, Liu D, Xi S, Li X, Lai W - Nanoscale Res Lett (2011)

SEM and TEM images of Si-O-N nanowires. (a) A typical SEM image of the as-grown Si-O-N nanowires. (b) A typical TEM image of Si-O-N nanowires.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3211981&req=5

Figure 1: SEM and TEM images of Si-O-N nanowires. (a) A typical SEM image of the as-grown Si-O-N nanowires. (b) A typical TEM image of Si-O-N nanowires.
Mentions: Figure 1a, b shows the typical SEM and TEM images of nanowires on a Si substrate, respectively. The diameter of the nanowires is ranging from 50 to 150 nm, and the length is about 100 μm. Splitting phenomena of nanowires are observed, where a three-branch structure with the same diameter is demonstrated in Figure 1b. The observation is different from the report by L. Gu et al., in which the diameter of the splitted branches is usually smaller than that of the trunk [15]. The individual branches here can be differentially chemically functionalized and terminated to create complex multiple chemical sensors in one unit [17].

Bottom Line: The obtained nanowires were attractive for their exceptional whiteness, perceived brightness, and optical brilliance.These nanowires display greatly enhanced reflection over the whole visible wavelength, with more than 80% of light reflected on most of the wavelength ranging from 400 to 700 nm and the lowest reflectivity exceeding 70%, exhibiting performance superior to that of the reported white beetle.Intense visible photoluminescence is also observed over a broad spectrum ranging from 320 to 500 nm with two shoulders centered at around 444 and 468 nm, respectively.

View Article: PubMed Central - HTML - PubMed

Affiliation: Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan 430074, China. zirong@mail.hust.edu.cn.

ABSTRACT
Large amounts of amorphous silicon oxynitride nanowires have been synthesized on silicon wafer through carbon-assisted vapor-solid growth avoiding the contamination from metallic catalysts. These nanowires have the length of up to 100 μm, with a diameter ranging from 50 to 150 nm. Around 3-nm-sized nanostructures are observed to be homogeneously distributed within a nanowire cross-section matrix. The unique configuration might determine the growth of ternary amorphous structure and its special splitting behavior. Optical properties of the nanowires have also been investigated. The obtained nanowires were attractive for their exceptional whiteness, perceived brightness, and optical brilliance. These nanowires display greatly enhanced reflection over the whole visible wavelength, with more than 80% of light reflected on most of the wavelength ranging from 400 to 700 nm and the lowest reflectivity exceeding 70%, exhibiting performance superior to that of the reported white beetle. Intense visible photoluminescence is also observed over a broad spectrum ranging from 320 to 500 nm with two shoulders centered at around 444 and 468 nm, respectively.

No MeSH data available.