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Morphological variations in cadmium sulfide nanocrystals without phase transformation.

Dhage SR, Colorado HA, Hahn T - Nanoscale Res Lett (2011)

Bottom Line: Environmentally stable and highly crystalline CdS nanorods have been obtained via a chemical bath method.The prepared CdS nanorods have been characterized by X-ray powder diffraction, TEM, UV-Vis spectroscopy, and photoluminescence spectroscopy.The importance of this phenomenon is vital for the potential application for CdS such as smart materials.

View Article: PubMed Central - HTML - PubMed

Affiliation: Mechanical and Aerospace Engineering Department, University of California, Los Angeles, CA 90095, USA. sanjay.dhage@gmail.com.

ABSTRACT
A very novel phenomenon of morphological variations of cadmium sulfide (CdS) nanorods under the transmission electron microscopy (TEM) beam was observed without structural phase transformation. Environmentally stable and highly crystalline CdS nanorods have been obtained via a chemical bath method. The energy of the TEM beam is believed to have a significant influence on CdS nanorods and may melt and transform them into smaller nanowires. Morphological variations without structural phase transformation are confirmed by recording selected area electron diffraction at various stages. The prepared CdS nanorods have been characterized by X-ray powder diffraction, TEM, UV-Vis spectroscopy, and photoluminescence spectroscopy. The importance of this phenomenon is vital for the potential application for CdS such as smart materials.

No MeSH data available.


Related in: MedlinePlus

(a) and (b) TEM image and corresponding SAED pattern of the CdS nanorods;); (c) and (d) images of different parts of rods at a higher magnification.
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Figure 2: (a) and (b) TEM image and corresponding SAED pattern of the CdS nanorods;); (c) and (d) images of different parts of rods at a higher magnification.

Mentions: A detailed microstructure information and morphology variation of the CdS nanorods was further characterized by TEM. Overall representative TEM images shown in Figure 2a revealed that the length of the CdS nanorods is in the range of 2 to 3 μm. The corresponding SAED pattern obtained from a field consisting of several tens of nanorods, as shown in Figure 2b, is an indication of a highly crystalline zinc blend CdS. The images at higher magnification are shown in Figure 2c,d. The shape of the nanorods appeared to be sharper towards the tip and wider at the bottom. The diameter of the nanorods at the bottom is about 90 nm and towards the tip is 40 nm. In Figure 2b, the SAED pattern is identified over all the rods, indicating the single-crystalline nature of the CdS nanorods. It is also interesting to note that the tip of the nanorods had a dark spot, which might have been CdS nanoparticles. The oriented growth of nanorods might have started from CdS particles and lead to the formation of CdS nanorods with a dark tip. This is somewhat similar to the CdS nanorod growth reported by Zhang et al [21].


Morphological variations in cadmium sulfide nanocrystals without phase transformation.

Dhage SR, Colorado HA, Hahn T - Nanoscale Res Lett (2011)

(a) and (b) TEM image and corresponding SAED pattern of the CdS nanorods;); (c) and (d) images of different parts of rods at a higher magnification.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3211837&req=5

Figure 2: (a) and (b) TEM image and corresponding SAED pattern of the CdS nanorods;); (c) and (d) images of different parts of rods at a higher magnification.
Mentions: A detailed microstructure information and morphology variation of the CdS nanorods was further characterized by TEM. Overall representative TEM images shown in Figure 2a revealed that the length of the CdS nanorods is in the range of 2 to 3 μm. The corresponding SAED pattern obtained from a field consisting of several tens of nanorods, as shown in Figure 2b, is an indication of a highly crystalline zinc blend CdS. The images at higher magnification are shown in Figure 2c,d. The shape of the nanorods appeared to be sharper towards the tip and wider at the bottom. The diameter of the nanorods at the bottom is about 90 nm and towards the tip is 40 nm. In Figure 2b, the SAED pattern is identified over all the rods, indicating the single-crystalline nature of the CdS nanorods. It is also interesting to note that the tip of the nanorods had a dark spot, which might have been CdS nanoparticles. The oriented growth of nanorods might have started from CdS particles and lead to the formation of CdS nanorods with a dark tip. This is somewhat similar to the CdS nanorod growth reported by Zhang et al [21].

Bottom Line: Environmentally stable and highly crystalline CdS nanorods have been obtained via a chemical bath method.The prepared CdS nanorods have been characterized by X-ray powder diffraction, TEM, UV-Vis spectroscopy, and photoluminescence spectroscopy.The importance of this phenomenon is vital for the potential application for CdS such as smart materials.

View Article: PubMed Central - HTML - PubMed

Affiliation: Mechanical and Aerospace Engineering Department, University of California, Los Angeles, CA 90095, USA. sanjay.dhage@gmail.com.

ABSTRACT
A very novel phenomenon of morphological variations of cadmium sulfide (CdS) nanorods under the transmission electron microscopy (TEM) beam was observed without structural phase transformation. Environmentally stable and highly crystalline CdS nanorods have been obtained via a chemical bath method. The energy of the TEM beam is believed to have a significant influence on CdS nanorods and may melt and transform them into smaller nanowires. Morphological variations without structural phase transformation are confirmed by recording selected area electron diffraction at various stages. The prepared CdS nanorods have been characterized by X-ray powder diffraction, TEM, UV-Vis spectroscopy, and photoluminescence spectroscopy. The importance of this phenomenon is vital for the potential application for CdS such as smart materials.

No MeSH data available.


Related in: MedlinePlus