Preparation and characterization of silver nanoparticles by chemical methods

مقدم أطروحة جامعية

Abd al-Aziz, Salah Mahdi

مشرف أطروحة جامعية

Ismail, Mukhlis Mawlud

الجامعة

الجامعة التكنولوجية

الكلية

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القسم الأكاديمي

قسم العلوم التطبيقية

دولة الجامعة

العراق

الدرجة العلمية

ماجستير

تاريخ الدرجة العلمية

2012

الملخص الإنجليزي

This thesis presents new, easy, and quick methods to prepare silver nano-particles at high concentrations without aggregate, non-toxic and freeof pollution.

The size and properties of these particles are controlled.

The AgNPs are prepared the approach chemical reductive silver salt solution (AgNO3) with seven different methods.

The main difference between the methods adopting different reducing agents and methods that used same reducing agents but of different quantities is explained.

The AgNPs are found to be pure and stable for long time.

Structures confirmed from X-ray diffraction (XRD) and the crystillate size was determined using Scherrer's equation to be about 32 nm (for AgNPs were prepared by 1mM of AgNO3 reduce with 2 mM NaBH4).

Effect of chemical solutions are studied utilizing absorption spectra measures.

This is used to get knowledge of the better concentration for the preparation of NPs, which improves the efficiency of the generation of NPs in the manner of the chemical method.

Solutions of NaBH4 at 2 mM, and (CTAB) at 0.8 mM, and oxalic acid at 14 mM, are found to enhance the efficiency for all the generation and the disperse, however, reduceing the aggregation of the AgNPs.

Absorption spectra for AgNPs showed a sharp and single absorption peaks.

In this search, the peak is extend between range 385-600 nm which indicates the generation of NPs of pure silver.

Better concentration for the preparation of silver particles in different solutions such as for NaCl was 5 mM, and PVP at 6 mM, where this concentration enhances the efficiency for all generations, size, dispersion, and prevents aggregation of the NPs prepared.

Nanocompsite matter was prepared from AgNPs, and a polymer PVA.

Decrease band gab energy for polymer PVA is tuned by adding different concentrations of AgNPs (from 5.82 eV to 2.65 eV).

التخصصات الرئيسية

العلوم الطبيعية والحياتية (متداخلة التخصصات)

الموضوعات

• الأموال
• الفضة

• APA
• MLA
• AMA

لغة النص

الإنجليزية

نوع البيانات

رسائل جامعية

رقم السجل

BIM-419347