The Laser Science and Technology branch awarded a master's degree to graduate student "Hawraa Mohammed Abdul Redha

The Laser Science and Technology branch awarded a master's degree to graduate student "Hawraa Mohammed Abdul Redha" for her thesis titled
“Synthesis of In2O3 Nanoparticles Decorated CNTs by Laser Ablation Method for Optoelectronic Application “
The defense was held in the late Prof. Dr. Abdulmutalib Ibrahim Al-Sheikh Hall in the department building, and the discussion committee consisted of:

• Professor Dr. Alwan Mohammed Alwan Department of Applied Sciences / Laser Science and Technology Branch - Chair
• Professor Dr. Rana Osama Mahdi Department of Applied Sciences / Laser Science and Technology Branch - Member
• Assistant Professor Dr. Alaa Abdul Jabbar Hussein Department of Applied Sciences / Laser Science and Technology Branch - Member
• Professor Dr. Khawla Salah Khshaan Department of Applied Sciences / Laser Science and Technology Branch - Member and Supervisor
• Professor Dr. Aseel Abdul Kareem Hadi Department of Applied Sciences / Laser Science and Technology Branch - Member and Supervisor

In this work, room-temperature Q-switched Nd: YAG laser ablation in single-step of indium target in water and MWCNT suspension, respectively, was used to create (In2O3) nanoparticles (NPs) with various fluences (15.9-22.3J/cm2) at 100 pulses, and indium oxide decorated MWCNTs (In2O3@MWCNTs) with different pulse counts (50,75,100,125) at 17.5 J/cm2. The colloidal solutions of indium oxide nanoparticles and indium oxide decorated CNTs have been examined, and the effects of the laser fluence and number of pulses on the properties have been investigated through, XRD, RMS, SEM-EDX microscopy, TEM, UV-Vis, and photoluminescence PL. XRD and Raman spectra have demonstrated that the synthesized In2O3 has a crystallite structure of body-center cubic (bcc), which also confirmed that all the appeared peaks belonged to In2O3 and MWCNTs in the In2O3@MWCNTs composites. Additionally, it demonstrated that increasing laser fluences and adding MWCNTs, improved the crystalline quality of the prepared In2O3 and In2O3@MWCNTs. The prepared colloidal can be applied to a silicon base to create an In2O3/Si and In2O3 -MWCNTs/Si heterojunctions, which are made by drop casting colloidal In2O3 NPs and In2O3@ MWCNTs colloidal NPs onto a single crystal silicon wafer. The I-V characteristics of the In2O3NPs/Si and In2O3@MWCNTs/Si heterojunctions under both dark and light conditions verified the rectifying behavior and the good photoresponse. The C-V measurements showed an abrupt junction, which allowed for the determination of the built-in voltage, the value of which is dependent on the laser parameters. The optimization of the In2O3@MWCNTs /Si heterojunction for high-performance photodetection applications is greatly aided by these results.