Limits...
Great blue-shift of luminescence of ZnO nanoparticle array constructed from ZnO quantum dots.

Wang N, Yang Y, Yang G - Nanoscale Res Lett (2011)

Bottom Line: The cathodoluminescence measurements showed that there is a pronounced blue-shift of luminescence comparable to those of the bulk counterpart, which is suggested to originate from ZnO QDs with small size where the quantum confinement effect can work well.The fabrication mechanism of the ZnO nanoparticle array constructed from ZnO QDs was proposed, in which the immiscible-like interaction between ZnO nuclei and Si surface play a key role in the ZnO QDs cluster formation.These investigations showed the fabricated nanostructure has potential applications in ultraviolet emitters.

View Article: PubMed Central - HTML - PubMed

Affiliation: State Key Laboratory of Optoelectronic Materials and Technologies, Institute of Optoelectronic and Functional Composite Materials, Nanotechnology Research Center, School of Physics & Engineering, Sun Yat-sen University, Guangzhou 510275, Guangdong, P, R, China. stsygw@mail.sysu.edu.cn.

ABSTRACT
ZnO nanoparticle array has been fabricated on the Si substrate by a simple thermal chemical vapor transport and condensation without any metal catalysts. This ZnO nanoparticles array is constructed from ZnO quantum dots (QDs), and half-embedded in the amorphous silicon oxide layer on the surface of the Si substrate. The cathodoluminescence measurements showed that there is a pronounced blue-shift of luminescence comparable to those of the bulk counterpart, which is suggested to originate from ZnO QDs with small size where the quantum confinement effect can work well. The fabrication mechanism of the ZnO nanoparticle array constructed from ZnO QDs was proposed, in which the immiscible-like interaction between ZnO nuclei and Si surface play a key role in the ZnO QDs cluster formation. These investigations showed the fabricated nanostructure has potential applications in ultraviolet emitters.

No MeSH data available.


Related in: MedlinePlus

The CL measurements of the ZnO nanoparticle array. SEM image (a), the panchromatic CL image (b), and the corresponding CL spectrum (c).
© Copyright Policy - open-access
Related In: Results  -  Collection

License
getmorefigures.php?uid=PMC3211426&req=5

Figure 3: The CL measurements of the ZnO nanoparticle array. SEM image (a), the panchromatic CL image (b), and the corresponding CL spectrum (c).

Mentions: In order to explore this fabricated nanostructure's potential applications, we measure the optical properties as shown in Figure 3. Figure 3 shows the CL measurement of the sample. The panchromatic CL image in Figure 3b exhibits that the intense luminescence is mainly from the ZnO nanoparticles. Interestingly, we can observe that the luminescence peak is centered at 363 nm as shown in Figure 3c, which is known as the near-band edge emission of ZnO. However, there is a great blue-shift compared to bulk ZnO in the CL spectrum. Based on previous reports [1,10,24,25], the blue-shift of the CL spectrum of ZnO QDs in our studies is attributed to the quantum-size confinement effect as follows [5,26](1)


Great blue-shift of luminescence of ZnO nanoparticle array constructed from ZnO quantum dots.

Wang N, Yang Y, Yang G - Nanoscale Res Lett (2011)

The CL measurements of the ZnO nanoparticle array. SEM image (a), the panchromatic CL image (b), and the corresponding CL spectrum (c).
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3211426&req=5

Figure 3: The CL measurements of the ZnO nanoparticle array. SEM image (a), the panchromatic CL image (b), and the corresponding CL spectrum (c).
Mentions: In order to explore this fabricated nanostructure's potential applications, we measure the optical properties as shown in Figure 3. Figure 3 shows the CL measurement of the sample. The panchromatic CL image in Figure 3b exhibits that the intense luminescence is mainly from the ZnO nanoparticles. Interestingly, we can observe that the luminescence peak is centered at 363 nm as shown in Figure 3c, which is known as the near-band edge emission of ZnO. However, there is a great blue-shift compared to bulk ZnO in the CL spectrum. Based on previous reports [1,10,24,25], the blue-shift of the CL spectrum of ZnO QDs in our studies is attributed to the quantum-size confinement effect as follows [5,26](1)

Bottom Line: The cathodoluminescence measurements showed that there is a pronounced blue-shift of luminescence comparable to those of the bulk counterpart, which is suggested to originate from ZnO QDs with small size where the quantum confinement effect can work well.The fabrication mechanism of the ZnO nanoparticle array constructed from ZnO QDs was proposed, in which the immiscible-like interaction between ZnO nuclei and Si surface play a key role in the ZnO QDs cluster formation.These investigations showed the fabricated nanostructure has potential applications in ultraviolet emitters.

View Article: PubMed Central - HTML - PubMed

Affiliation: State Key Laboratory of Optoelectronic Materials and Technologies, Institute of Optoelectronic and Functional Composite Materials, Nanotechnology Research Center, School of Physics & Engineering, Sun Yat-sen University, Guangzhou 510275, Guangdong, P, R, China. stsygw@mail.sysu.edu.cn.

ABSTRACT
ZnO nanoparticle array has been fabricated on the Si substrate by a simple thermal chemical vapor transport and condensation without any metal catalysts. This ZnO nanoparticles array is constructed from ZnO quantum dots (QDs), and half-embedded in the amorphous silicon oxide layer on the surface of the Si substrate. The cathodoluminescence measurements showed that there is a pronounced blue-shift of luminescence comparable to those of the bulk counterpart, which is suggested to originate from ZnO QDs with small size where the quantum confinement effect can work well. The fabrication mechanism of the ZnO nanoparticle array constructed from ZnO QDs was proposed, in which the immiscible-like interaction between ZnO nuclei and Si surface play a key role in the ZnO QDs cluster formation. These investigations showed the fabricated nanostructure has potential applications in ultraviolet emitters.

No MeSH data available.


Related in: MedlinePlus