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تصنيع ودراسة خواص معدن - فثالوسيانين العضويه كمتحسس حرارة == Fabrication and Study Properties of Organic Metal - Phthalocyanine as Temperature Sensor
Author name:
رؤى مثنى علي
Supervisor name:
ندى خضير عباس
General topic:
Physics
Specific topic:
Solid State and Materials Physics
Degree:
Master
University:
University of Baghdad - College Of Science For Girls - Physics Department
Language:
English
University location:
Baghdad
First pages:
26T1843 - p.pdf
Abstract:
Copper Phthalocyanine tetrasulfonic acid tetrasodium salt (CuPcTs) thin films with different annealing temperatures (100, 150 and 200)oC have been prepared by spin coating technique on glass & ITO substrate with speed rate of 1000 rpm for 1 min, the obtain films have 100±5 nm thickness. This dissertation deals with different measurement techniques (Thermal, Structure, Morphological, Optical and Electrical measurements) in order to investigate the optimum condition to fabricate sensor device.The structures of CuPcTs thin films which deposited on glass substrate have been studied by X - ray diffraction (XRD), Atomic Force Microscope (AFM) and (FESEM) techniques, XRD studies show that thin films have polycrystalline structure for all annealing emperatures with perfect orientation (001). Also the surface morphology by AFM measurement for CuPcTs thin films has been studied; it shows that all films after heat treatment go to Nano size. The roughness decreases with increasing temperatures, and by (EDX) technique the elemental ratios of thin films are determined.The optical measurement showed that the as - deposited and annealed films have two peaks which are (B, Q1and Q2) bands, B in Ultra Violet region attributed to transition between d level for Cu metal and π* in LUMO, and Q bands in Visible region attributed to the transition between π(HOMO) - π* (LUMO). These measurements demonstrated that the energy gap of CuPcTs depends on the annealing temperatures, the photoluminescence spectra (PL) showed the traps inside energy gap play an important role and effect onoptical behavior. It’s studied to confirm the results of optical band gap, FTIR spectra give results about the bonds of (CuPcTs) and its position compared with H2Pc as a reference. The electrical properties of these films were studied with differentannealing temperature. Hall measurements showed by increasing thin films temperature the conductivity decreased at 100oC then it increase at 150oC finally it returned to decrease that may be due to phase transitions, all the films are p - type.CuPcTs Capacitive - Resistive surface type temperature device sensor has been fabricated by using two electrodes (Aluminum and Silver), the capacitive response of this sensor was observed by Raising the temperature gradually.Capacitive - Resistive temperature sensor showed that the response to variation of temperature in range (RT - 200)0C and the response time ≈ 20±5 Sec. for two electrodes, The fabricated sensor appear enough sensitivity and good response and recovery times and strong affected by frequency variation.Practical experience has shown results that aluminum electrode has capacitance and resistance higher than the silver electrode depending on the different frequencies values, while the silver electrode has the shortest response time.
