Wednesday, 25 May 2016

Reflection for 25 May 2016 (Wednesday)

Today, we learn about something call the Scanning Electrons Microscope or SEM for short. We got to experience how the SEM works. We also got hands-on experience on a virtual one as we are teenagers and we often are careless, therefore, we do not get a hands-on action on the real SEM. However, from the virtual SEM, we can learn plenty. Firstly, we learn the procedure that needs to be taken to achieve an SEM of an object. Secondly, we also learn about the objectives of using an SEM instead of a light microscope. Thirdly, we also learn about how to operate a real SEM although we did not get a hands-on experience. 

Firstly, the procedure that needs to be taken when using an SEM. Firstly, we have to vent the column before inserting the specimen. Then, we have to pump down, which in other words evacuation. After that, you set the value for accelerating voltage, spot size and working distance before turning on the high voltage. However, in the real SEM, the accelerating voltage, spot size and working distance could be auto set by the computer. After that, you select the load current then select TV rate. After that, click slow scan 1 and you adjust coarse focus and fine focus. Following, click slow scan 2 and adjust the image control accordingly. Last but not least, make sure all of the red dots are in-line in the middle and then save the image. 

Secondly, the objectives of using an SEM instead of a light microscope. SEM is a type of electron microscope that produces images of a sample by scanning it with a focused beam of electrons. The electrons interact with atoms in the sample's surface topography and composition. Therefore, an SEM can have a resolution much clearer than that of a light microscope. Hence, when collecting results, we will always want clearer and more reliable results, therefore, we will use an SEM instead of a light microscope. 

Thirdly, we learn how to operate a real SEM through the teachings and mentorings of Mentor Jerome Lim. He showed us step by step on how the machine can be use and the RAMS on the SEM. Of course, Mentor Gavindo and Mentor Alex did the exact same thing and we learn a lot from this NTU - SST Flagship Programme. 






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