For my lab on depositing thin films on a surface via thermal evaporation I was asked...

For my lab on depositing thin films on a surface via thermal evaporation I was asked hat would have happened if we had obtained different color metals on the samples after the thermal evaporation? The only thing I can think of is there was a leak in the vacuum chamber so a nonintended product could have formed via chemical reaction or chemical mixing. Can someone please give me a clearer answer. Thanks!

Expert Solution

1. High vacuum is critical for evaporation process. When gas is evacuated from a chamber, vapor molecules inside it can travel longer distances before they collide with a gas. Collision with gas molecules are undesirable as they change the direction and affects the absorption on the surface.

2. Background gases in the chamber can lead to contaminatio of the film because of presence of oxygen, moisture which are responsible for the light emission or absorption property.

3. Vapou presure of deposit material should be much higher than the resistive boat material otherwise it can contaminate the metal. When choosing a resistive boat for a given material, it is critical to ensure a high melting point differential and low solubility.

4. The size of the particle is also important as their property changes with change in the size. The thickness of the film also plays a role in deciding the color because the reflectivity property changes.

Amanda K answered 2 years ago

For my lab report, i was asked to find the volume uncertainty of different cylinders: Length...

For my lab report, i was asked to find the volume uncertainty of different cylinders: Length m Diameter m (r = d/2) A 0.0407 ± 0.00025 m 0.0179 ± 0.0005 m B 0.0377 ± 0.00025 m 0.0317 ± 0.0005 m C 0.0361 ± 0.00025 m 0.019 ± 0.0005 m D 0.0462 ± 0.00025 m 0.0158 ± 0.0005 m E 0.0339 ± 0.00025 m 0.019 ± 0.0005 m in the table below, its the volume but what I NEED IS ITS...

I designed a substrate holder for a thermal evaporator for a lab I work in, based...

I designed a substrate holder for a thermal evaporator for a lab I work in, based on the size of our chamber. It is height adjustable (rod stopping height from falling) with 2 or 3 mm tolerances. The boat will be very close to tungsten boats as they are heating up. My question is... what materials should I consider using for this design? And what temperatures can these materials go up to without oxidation occuring? What temperatures can they go...

I am doing a post lab for a acid and base buffers lab. I was asked...

I am doing a post lab for a acid and base buffers lab. I was asked to find the theoretical pH (what the pH should actually be) for each of my pH's in my data please help it is due tonight and that is the only question I cannot figure out. I just need one of the theoretical pHsd' one and I can do the rest. Background: 30 mL of sodium dihydrogen phosphate and 20 mL k2HPO4 was added to...

Is Aspirin polar or non-polar? In my thin layer chromotography lab the aspirin traveled far up...

Is Aspirin polar or non-polar? In my thin layer chromotography lab the aspirin traveled far up the silica gel plate which would mean it's non-polar. But looking that the chemical structure it looks to me like it is polar. Why would it travel up the plate so far if it is a polar molecule or is it not polar for some other reason?

Ok this is a exerpt from my lab. I prepared all my solutions correctly, and am...

Ok this is a exerpt from my lab. I prepared all my solutions correctly, and am getting ready to use the spectrophotometre. But is is asking for precise concentrations, and i am confused as two how to use the dilution formula M1V1=M2V2 to find them. Any advice would be appreciated. You should now have six “dilute” solutions containing known concentrations of tetraaquasalicylatoiron(III) ion in addition to the stock solution. The concentrations of these dilute solutions are approximately (assumes stock solution...

There is something wrong with my arduino lab. I want my four leds to light up...

There is something wrong with my arduino lab. I want my four leds to light up one after the other. Then the speaker plays music, and 4 leds change with music. But my code only makes one of them work. Please help me modify my code const int switchPin = 8; unsigned long previousTime = 0; int switchState = 0; int prevSwitchState = 0; int led = 2; // 600000 = 10 minutes in milliseconds long interval = 1000; int...

These are reactions I did in my lab. I need to write the molecular, total ionic,...

These are reactions I did in my lab. I need to write the molecular, total ionic, and net ionic reactions for them. Even after watching Khan Academy and using my book, I was still unsure, so I asked the professor and he said every single one was wrong and told me to figure it out. I know this is long, but I would really appreciate it. I need the molecular, total ionic, and net ionic equations for all of them....

This is my lab and I am very confused regarding the calculations! It is supposes to...

This is my lab and I am very confused regarding the calculations! It is supposes to demonstrate Le Chatelier’s principle. After doing the following I need to calculate the molar absorbance for Co(H20)6 2+. The path length is 1cm and absorbance is .551. I got 5.51 L/mol *cm. I also need to calculate the CoCl4 2- molar absorbance which I do not understand. The absorbance is .570 and the path length is 1cm. I do not know how to find...

This is for my biochemistry lab, the experiment is dealing with trypsin and BPTI. I need...

This is for my biochemistry lab, the experiment is dealing with trypsin and BPTI. I need to make a graph: plot the absorbance change per minute versus the BPTI concentration for each cuvette. here are my cuvettes and amount of BPTI added to each 1- 0uL BPTI added 2- 10 uL BPTI added 3-20 uL BPTI added 4-30 uL BPTI added 5- 40 uL BPTI added 6- 50 uL BPTI added. Each cuvette has a different amount of water and...

I almost finished my pre-lab... but I am stuck! What are the energies of (-)-menthone and...

I almost finished my pre-lab... but I am stuck! What are the energies of (-)-menthone and (+)-isomenthone? How can I find this (how to do it)? Thank you for the help!

Question