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Experiment Nanoscale thin films

Education

Experiment Nanoscale thin films

Mon, 31 Mar 2014
2 comments

We are teachers from “Emil Racovita” high school from Galati, Romania. I, Enache Gabriela Elena together with Cozmaciuc Aurica have coordinated our students: Enache Nicoleta and Ilie Adriana during the “EXPERIMENT B: NANOSCALE THIN FILMS”. First of all we made sure that all the personal protection are taken as indicated and then started the experiment.

 

1. We used the piece of conductive glass ( ITO glass) as working electrode. The deposition of the nanoscale this film occurred on this surface. The measured the the resistance on both sides and then marked the conductive surface (they wore gloves during this whole process to avoid fingerprints).

 

2. The next step was immersing the ITO glass inside a solution and a nanoscale film forms once once we started the electrosynthesis. They measured the area of the ITO glass first in order to decide how much current to give during the electrosynthesis.

 

3. The students connected the working electrode (glass-ITO) to the negative lead of the galvanostat and the positive lead to the counter electrode (Pt or graphite). Then performed the synthesis on different samples for different times. (under our surveillance)

 

4. The following step consisted in obtaining information on the absorbency of the thin films we have produced using a desktop scanner.

                         

Conclusion: Based on the results they have obtained, they could say there is a linear correlation between the time of synthesis of the samples and their optical absorbency. The optical absorbance rises along with the amount of time hey have submersed the sample (time of synthesis) and the estimated thickness.

 

The second part of the experiment was based on the electroreduction that yields Prussian white (PW) also known as Everitt’s salt (and this is the process we will be focusing on in this part of the experiment). During this process Prussian Blue thin films became colorless. In this part, our students  used the Prussian Blue thin film they have had prepared in Part 1 and studied their electroreduction to Prussian white (WP): they applied a positive voltage using a 1.5 V battery to the film and noticed the color variation from blue to transparent.

 

2 Comments

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Buna ziua,

Buna ziua, Am realizat si eu experimentul si mi-ar face placere sa impartasim impresii. adresa mea: dana_arv@yahoo.com Dana Arvunescu

congratulations!

congratulations!

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