Master Thesis Discussion

The Department of Chemistry at the College of Education for Pure Sciences discussed a master’s thesis for the student (Furqan Saleh Mahdi) under the supervision of the respected Dean of the College of Education for Pure Sciences (Prof.Dr. Hamida Aidan Salman) and (Asst. Prof. Dr. Ahmed Khairallah Shaheed) from the Department of Physics. For her dissertation entitled (The comparison between two acids for the production of porous silicon). The study aimed to:
1. Study of the properties of electro-etched porous silicon.
2- Analysis of the response of porous silicon to hydrofluoric and nitric acids.
3- Studying the behavior of porous silicon in hydrofluoric and nitric acid.
-4 Measurement of porosity, layer thickness, refractive index, relative permittivity, and capacitance of porous silicon.
5- Preparation of porous silicon from silicon using HF + Ethanol, HF + HNO3 and HNO3 + Salt.
* The most important conclusions:
Given these results and data, the electrochemical etching method can be considered a highly valuable technology for manufacturing materials with acceptable qualities for use in a range of applications. This is because Ps materials can be produced by this technology. Here is an overview of the important findings:
1- Electrochemical etching of silicon, which is one of the etching processes currently available and currently under research. Its properties combine the properties of electrochemical etching with those of using induced etching to provide a straightforward, inexpensive, and easy-to-manage etching procedure.
2. The morphological characteristics of the Ps formed through the electrochemical etching method were striking and highly sensitive to the preparation preparations.
3- When compared to other methods, the amount of time required to fabricate porous silicon surfaces by electrochemical etching is significantly shorter.
4- The rise and fall of porosity is a result of the relative permittivity and refractive index, which are mathematically related to the properties.
5- Our data results in the conclusion that one morphological characteristic is related to another, and that the increase and decrease of one morphological characteristic are mathematically related to the other.
6- Nano-silicon produced from nitric acid and HF is of good quality, but its pattern is special, which means that the uses of nano-silicon for this solution are limited
7- Because nano-silicon is formed by the reaction of ethanol and HF in a variety of patterns, its uses are many and varied
8- Nanoballs made of ethanol and HF are thicker.
9- When the nano-silicon layer is formed, it turns into holes and the electrical charges are less contained, which leads to a decrease in the capacitance in nitric acid and HF.
After extensive scientific discussion and listening to the student’s defense of her thesis, her research method, and her use of sources and references, the thesis was approved with distinction. Congratulations to the student, her supervisors, the Department of Chemistry, and the College of Education for Pure Sciences for this great achievement. May God grant you success.