Biophotonic Imaging
In Laser Zentrum Hannover (LZH), at the department of "industrial and Biomedical Optics" and under the supervision of Dr. Heiko Meyer and Lena Nolte, I am working with multiphoton microscope and scanning laser optical tomography setup to image different biomedical samples, such as cochlea,the embryo of insects, lymph nodes cells, mouse's aorta, and so on. During this project, I get also acquainted with optical clearing techniques and received the valuable knowledge of biomedical tissues and specimens.
Fiber-Optic sensor
In this project, I designed an evanescent based fiber optic gas sensor. For this purpose, I used a 9/125 single mode fiber optic and etched its clad chemically to reach to the core. I chose nano-sized tin oxide as a sensing layer and using the electron-beam evaporation technique to depositing the tin oxide on the fiber optic core surface. In order to reach to desire tin oxide particle size, I controlled the rate, thickness and temperature of the deposition process.
Within this research I design and fabricate a home-made fiber optic gas sensor test setup and also I design and fabricate an additional module for Shimadzu UV1800 spectrophotometer to modify its capabilities in order to investigate thin films Optical spectrum in presence of gases and vapors.
IR Smoke Detector
Graphene Synthesis
In this project we synthesized multi and mono-layer graphene using the mechanical exfoliation method on silicon wafer surface. Then we tried to cut the monolayer graphene to make graphene nanoribbon. During this project I became familiar with the fascinating world of two dimensional materials and carbon based structures, and I owe these all to Dr. M. Berahaman who first introduced this world to me.
Wet Chemical Etching
In this project, I designed and fabricated a home made setup for wet chemical etching with precise temperature control and a cooler for cooling the evaporated vapor from etchant solution and restoration them into solution to fix the solution concentration. In addition, this setup had a water circulation system to prevent from increasing the temperature the back side of wafer. Using this set up I etched various layers and substrates such as Silicon, Gold, Platinum, Chrome and so on, for my colleague's projects and my own projects in Shiraz University Nanotechnology research institute. Moreover, during this project, I worked on the roughness of etched Silicon wafers. Adding alcohol to KOH solution and control the temperature and alcohol concentration I suggested a protocol to achieve optimal roughness and etch rate for silicon wafers.
CNT Based Gas Sensor
In this project, I worked in interdigitated electrodes. I used Corel Draw software to design the electrodes, then using photo-lithography technique and chemical etching I created the interdigitated electrodes on silicon wafers. The distance between two electrodes was about 50 micrometers. These project was part of Dr. Dehghani's project for his doctoral thesis. I was a Bachelor student when I did this project. Dr. Dehghani is an assistant professor in Shiraz University, now.
Organic Transistors
In this project, my duty was research about proper organic material for organic FETs and deposition different layers of transistor using evaporation techniques. Moreover, I measured the capacitance value of contact layers. During this project I learnt about organic materials and organic devices such as OLEDs and OFETs. These project was part of Dr. Karimi's project for his doctoral thesis. I've just finished my B.S. studies when I did this project. Dr. Karimi is an assistant professor in Isfahan University, now.