Fabrication of TiO2 nanotubes for chemical Sensing

العناوين الأخرى

تصنيع متحسس كيميائي باستخدام أنابيب التيتانيوم النانوية

مقدم أطروحة جامعية

Mirza, Bahar Ahmad

مشرف أطروحة جامعية

Muslim, Zaynab Rahim

أعضاء اللجنة

Natiq, Naji Usamah
Jafar, Harith Ibrahim
Najm, Tariq S.

الجامعة

جامعة بغداد

الكلية

كلية العلوم

القسم الأكاديمي

قسم الفيزياء

دولة الجامعة

العراق

الدرجة العلمية

ماجستير

تاريخ الدرجة العلمية

2014

الملخص الإنجليزي

TiO2 nanotubes fabricated through anodization of Ti foils in (NH4F 0.5 wt%) & (ethylene glycol 95.5wt%) with (4wt % di ionized water) The effect of voltage variation on the tube diameter, tube length, tube wall thickness and cell diameter for (1) hr, in room temperature was investigated in this thesis.

The anodization potential was varied from (10, 20, 30, 40, 50, 60, 70 and 80)V with fixed parameters like concentration NH4F, time and temperature was achieved in the preparation of nanotubes.

Optimum morphologies were observed for nanotubes prepared in (50, 80)V At 50V, the length and diameter of tubes approximate 3019 nm & 79 nm respectively, while at 80V the length and diameter of tubes approximate 8210 nm & 46 nm respectively.

Electro deposition of silver ions onto TiO2 NT was obtained by mixing silver nitrate (10 Mm) with sulfuric acid (0.1 M) to fabricate Ag-TiO2 nanotube for NO2 gas sensor.

NO2 gas sensor based on TiO2 & Ag- TiO2 nanotubes was fabricated and characterized as a function of temperature (50, 100, 150, 200, 250 and 300) oC .

Resistance variation as a function of temperature for different concentration of NO2 vapor gas (10, 20, 30 and 40) ppm was investigated.Higher resistance was observed for Ag-TiO2 nanotubes prepared for (50)V compared to the resistance of (80)V.

The resistance was increased with the increasing in NO2 concentration for pure TiO2 & Ag-TiO2 nanotubes.

In general the resistance of Ag-TiO2 was higher than pure TNT’S.

The sensor response was studied using sensitivity curve for TNT’S & Ag-TiO2 nanotube .

EDX was used for pure TNT’S & Ag-TiO2 nanotubes to find out the elements composing the produced samples.

Morphological studies of the tube dimensions was obtained using AFM used to measure the average diameter of TiO2 & nanotube and roughnes of the surface & SEM was used to image the topography of TiO2 nanotubes prepared for different voltages.

التخصصات الرئيسية

الفيزياء

عدد الصفحات

88

قائمة المحتويات

• APA
• MLA
• AMA

لغة النص

الإنجليزية

نوع البيانات

رسائل جامعية

رقم السجل

BIM-607291