X-ray Energy Dispersive Spectrometry (XEDS) and Electron Spectrometry (EELS)

Aim:

To confirm the atomic ray Energy Dispersive SpectrometrySpectroscopy (EELS).

Experiment details:

The experiments were spectroscopic measurements of X

Results and Discussions:

� Image:

The fig.1 shows that the TEM image of of sizes of the nanoparticles ranging from 7.98 nm to as big as 22.7 nm. If we closely look at the shapes of the nanoparticles, it shows the crystal facets.region where we have carried out the XEDS and EELS measurements of the given nanoparticles.The black region in the left corners of the image is due to the selective area

Fig. 1 TEM image of Fe3CoO

Rajasekarakumar Vadapoo

D

University of Puerto

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ray Energy Dispersive Spectrometry (XEDS) and Electron Spectrometry (EELS)- Report # 2.

atomic composition of the given sample by the spectroscopic method trometry (XEDS) and reconfirming by using Electron Energy Loss

were carried out in Carl zeiss 200 KeV TEM with the capability of spectroscopic measurements of XEDS and EELS. The sample used was Fe

The fig.1 shows that the TEM image of Fe3CoO4 nanoparticles. As we see we have a distribution of sizes of the nanoparticles ranging from 7.98 nm to as big as 22.7 nm. If we closely look at the shapes of the nanoparticles, it shows the crystal facets. Fig.2. shows the TEM image of the

have carried out the XEDS and EELS measurements of the given nanoparticles.The black region in the left corners of the image is due to the selective area

CoO4 nanoparticles Fig.2. The area of XEDS &EELS taken.

Rajasekarakumar Vadapoo

Department of Physics,

University of Puerto Rico,PR-00931,USA.

ttp://nanophysics.wordpress.com

ray Energy Dispersive Spectrometry (XEDS) and Electron Energy Loss

by the spectroscopic method X-using Electron Energy Loss

TEM with the capability of Fe3CoO4 nanoparticles.

nanoparticles. As we see we have a distribution of sizes of the nanoparticles ranging from 7.98 nm to as big as 22.7 nm. If we closely look at the

Fig.2. shows the TEM image of the have carried out the XEDS and EELS measurements of the given nanoparticles.

The black region in the left corners of the image is due to the selective area aperture corners.

The area of XEDS &EELS taken.

� X-ray Energy Dispersive Spectrometry (XEDS):

Fig. 3. The XEDS plot shows the presence of the elements present in the sample for the corresponding peak.

0 1 2 3 4 5 6 7 8 9 10

0

200

400

600

800

1000

1200

1400

1600

0.51

0.74

0.93 4.97

4.51

6.41

6.93

8.05

Energy in keV

8.92

Fig. 4. The plot shows the measured XEDS energy of the peaks in keV.

Experimental (keV)

Reported (keV)

Corresponding lines

0.51 0.525 O Kα 0.74 0.776 Co Lα 0.93 0.93 Cu Lα 4.51 4.508 Ti Kα 4.97 4.931 Ti Kβ 6.41 6.398 Fe Kα 6.93 6.924 Co Kα 8.05 8.04 Cu Kα 8.92 8.904 Cu Kβ

Table. 1. Shows the experimentally observed XEDS peaks and the corresponding reported value of X-Ray emission and absorption edge energies.

Fig. 3 & 4 shows the measured XEDS peaks corresponding possible elements and the corresponding energies respectively. Table 1. Clearly shows that the experimentally observed XEDS peaks exactly match with the corresponding reported lines of the element as shown in the table as well as the corresponding elemental details shown in fig.3. From these details we can confirm that the nanoparticles what we measured were containing the atomic elements Fe, Co & O.

� Energy Loss Spectrometry (EELS):

The measured EELS spectrum of the given sample is given below for the corresponding elements present

Edge-type Reported edges (eV) Measured edges (eV) Kα K(a,b) 1st Edge 2nd Edge 3rd Edge C-K 277 282 ~ 277 ~ 292 ~ 318 O-k 525 531 ~532 ~ 538 ~ 565 Table. 2. Experimentally measured X-Ray energy emission and absorption edges along with the reported edges of the element C & O.

Edge-type Reported edges (eV) Measured edges (eV) Lα Lβ1 Lν1 LIII(ab) LII(ab) 1st Edge 2nd Edge Co-L3 776 791 794 779 794 ~ 785 ~ 805 Fe-L3 705 718 721 709 720 ~ 715 ~ 725 Table.3. Experimentally measured X-Ray energy emission and absorption edges along with the reported edges of the element Co & Fe.

Fig. 5. EELS spectrometry spectrums obtained in the experiment for the constituent elements of the sample along with carbon.

The fig.5 & table.2, 3 showconstituent elements. It could be overcome by havingzero eV. Overall the measured edges match with the reported edges ofelements which show that the particular elements are present in the given sample. The broadening of peaks which cover thetogether and or contains some other fine structure details

Conclusions:

We have carried out the Transmission Electron Microscopy nanoparticles. The elemental characterization atomic elements Fe, Co and O

740.0 760.0 780.0 -10.0

0.0

10.0

20.0

30.0

40.0

Energy Loss

Digits

Inte

nsity

Parallel EELS Co

EELS spectrometry spectrums obtained in the experiment for the constituent elements of the sample along with carbon.

3 show that the measured edges have little shifttituent elements. It could be overcome by having the correction of exact

zero eV. Overall the measured edges match with the reported edges ofthat the particular elements are present in the given sample. The

which cover the area of edges shows that it could have several esome other fine structure details along with the edges

We have carried out the Transmission Electron Microscopy imaging of given he elemental characterization using XEDS & EELS show

atomic elements Fe, Co and O in the measured region of the sample.

530.0 550.0

0.0

50.0

100.0

Energy Loss

Digits

Inte

nsity

Parallel EELS O

800.0eV

Parallel EELS Co - L3

680.0 700.0 720

0.0

20.0

40.0

Energy Loss

Digits

Inte

nsity

Parallel EELS Fe

EELS spectrometry spectrums obtained in the experiment for the constituent elements of

that the measured edges have little shift for most of the of exact Zero loss peak at

zero eV. Overall the measured edges match with the reported edges of the given constituent that the particular elements are present in the given sample. The

area of edges shows that it could have several edges merges along with the edges.

maging of given Fe3CoO4 using XEDS & EELS show the existance of the

570.0 590.0eVEnergy Loss

Parallel EELS O - K

720.0 740.0eVEnergy Loss

Parallel EELS Fe - L3