Iron Sample

Iron Sample

Here is a blog that consists our data about the Iron (Fe) Sample taken under the Scanning Electron Microscope (SEM). Dr. Hassel and Dr. McColgan provided us with 3 stages that each consisted of 6 different element samples in them. This is the data we collected when we studied the Iron Sample from these stages. Below is the data we collected:

Data Number: SAInTCentr

Magnification: 3000

Accelerating Voltage: 30000 Volt

Emission Current: 84000 nA

Working Distance: 15400 um

Above is the spectrum for the Iron Sample.

In the Iron sample we observed we found both traces of Iron(Fe) and Chromium(Cr). The Iron traces peaked at 0.707 keV, 0.619 keV, 6.406 keV, and 7.058 keV. The Chromium peaked only at 5.416keV.

 Below is the data we collected using the HD Prime X-Ray Flourescence (XRF) Analyzer:

Quantum Dot Sample

We received 6 different quantum dot samples, each with a different UV Abs Peak. The various peaks can be seen in the following images for each of our quantum dots samples. Notice the change in color as the peak changes. Also notice each of the samples has a +/- 10 nm error. The images of our samples can be seen below.

The Individual images of each quantum dot can be seen here.

Steel Sample

Steel Sample

Here is a blog that consists our data about the Steel Sample taken under the Scanning Electron Microscope (SEM). We obtained a Steel Sample from Metal Supermarkets located in Albany, NY. They were nice enough to donate some metal samples to us so we could conduct our research on various metal samples under the SEM. Below is the data we collected:

Owner/Manager - Diane H Watters

1054 Broadway, Albany, NY 12204

(518) 435-0024

dwatters@metalsupermarkets.com

Data Number: SAInTCentr

Magnification: 2300

Accelerating Voltage: 30000 Volt

Emission Current: 86000 nA

Working Distance: 9700 um

Above we can see the spectrum for the Steel Sample.

We found that Steel consists of Iron(Fe), Aluminium(Al), and Chlorine(Cl). The Iron traces peaked at 0.708 keV, 6.404 keV, and 7.061 keV. The Aluminium peaked at 1.487 keV. The Chlorine peaked at 2.622 keV, and interestingly enough there were also some traces of Silicon(Si). The Silicon peaked at around 1.744 keV.

 Below is the data we collected using the HD Prime X-Ray Flourescence (XRF) Analyzer:

Previous Experimentation on Quantum Dots

From here the software is used to record an emission Spectra that looks something like the image below.

Another possible experiment is through the use of various glass filters, each filter having a different size quantum dot. By find the absorption spectra one can determine the quantum dot band gaps and radii. The experiment would look something like the image below.

The results from each filter should look like the following image here.

A very useful equation in determining the size of a quantum dot can be seen below.

General view of Using Spectroscopy with Quantum Dots - Lab Overview (Buffalo.edu)

To record the spectra, samples each with a different nanocrystal radius can be used. From these data, you can determine the average nanocrystal radius as well as its range of values.

Finally, you can record the emission spectrum for just the light source (light emitting diode LED) which you use to excite the Quantum Dot spectra

The spectrometer can be used to record the absorption spectra from CdSe nanocrystals also known as “quantum dots.” 
The QDs will be in the form of glass filters each with a different nanocrystal radius. 

"These filters aren’t just painted or colored glass, but actually quantum dots inside of the glass itself."

The spectrometer captures a transmission spectrum similar to the one shown below;

Expected result from the SEM for Quantum Dots;

http://www.physics.buffalo.edu/faculty/APetrou/QD_Intro.pdf

Brass Sample

Brass Sample

Here is a blog that consists our data about the Brass Sample taken under the Scanning Electron Microscope (SEM). We obtained a Brass Sample from Metal Supermarkets located in Albany, NY. They were nice enough to donate some metal samples to us so we could conduct our research on various metal samples under the SEM. Below is the data we collected:




Owner/Manager - Diane H Watters
1054 Broadway, Albany, NY 12204
(518) 435-0024
dwatters@metalsupermarkets.com

Data Number: SAInTCentr

Magnification: 2300

Accelerating Voltage: 30000 Volt

Emission Current: 84000 nA

Working Distance: 12400 um

Above we can see the spectrum acquired by the Brass Sample.

We found that Brass consists of Zinc(Zn), Copper(Cu), and Aluminium(Al). The Zinc peaked at 1.015 keV, 8.627 keV, and 9.575 keV. The Copper peaked at 0.933 keV, 8.046 keV, and 8.908 keV. The Aluminium only peaked at 1.489 keV.

 Below is the data we collected using the HD Prime X-Ray Flourescence (XRF) Analyzer:

Aluminium Sample

Aluminium Sample

Here is a blog that consists our data about the Aluminium Sample taken under the Scanning Electron Microscope (SEM). For this sample, we studied the aluminium from the stages we use to place most of our other samples on. When we study other samples that we place on the stage, most of the time aluminium shows up on the spectrum for other samples. This is most likely because of the aluminium stage that we place our samples on. For this data collection we zoomed in on just the aluminium stage itself and took data from there. Below is the data we collected:

Data Number: SAInTCentr

Magnification: 2300

Accelerating Voltage: 30000 Volt

Emission Current: 87000 nA

Working Distance: 18200 um

As we expected, this sample mostly consists of the element Aluminium. There were however some Magnesium traces in this particular sample. 

Above we can see the spectrum obtained for the Aluminium Sample. 

We found the Aluminium(Al) to peak at 1.496 kev, and the Magnesium(Mg) to peak at 1.255 keV.

 Below is the data we collected using the HD Prime X-Ray Flourescence (XRF) Analyzer: