Effect of Reaction Time on the Blue Shift of Chemically Created Silver Nanoparticles

The structural properties of (Ag-NPs) nanoparticles prepared by the chemical method were examined using (XRD) diffraction. Additionally, the optical properties were tested using a UV-Vis spectroscopy instrument, and a scanning electron microscope was used to analyze the surface morphology, We found that (Ag-NPs) nanoparticles have the highest absorbance at wavelengths of (400)nm and that the granular size of these material ranges between (29 – 89)nm. And The morphology analysis further revealed that (Ag-NPs) particles are spherical in shape

Optical and structure Characteristics of diamond like-carbon thin films produced by PLD.

تم استخدام ليزرND: YAG الطول الموجي ١٠٦٤ نانومتر  في الترسيب بالليزر النبضي  PLD لتكوين غشاء الماس شبيه الكاربون DLC على اساس زجاجي في درجة حرارة الغرفة. التركيب ومورفولوجيا السطح بالفحص بمجهر القوى الذرية  AFM لدراسة الغشاء  وتحويل فورييه لأطياف الأشعة تحت الحمراء FTIR للماس شبيه الكاربون DLC المستخدمة لمعرفة وجود الروابط وكذلك خصائص المجهر الالكتروني الماسح SEM وتشتيت الطاقة بالأشعة السينية EDX . يحتوي غشاء الماس شبيه الكاربون DLC المرسب على بنية مدمجة من الحبيبات المتراصة ويحتوي الغشاء على جسيمات غير منتظمة الشكل ( عناقيد) منDLC واكدت أطياف FTIR ان غشاء DLCيحتوي على ذرات كاربون مع تهجينsp3  وتم التحقيق في الخواص البصرية مع النتائج المتعلقة مثل النفاذية ومعامل الامتصاص وفجوة الطاقة البصرية والانعكاس R ومعامل الخمودKومعامل الانكسارn .     The utilizing of Nd: YAG laser (wave length-1064 nm) in the pulsed laser-deposition-PLD for placing diamond-like carbon DLC-film on glass substratum at the normal temperature of room. The composition and morphology of the surface for the atomic force microscopy (AFM), synthesized film and Fourier transform infrared FTIR-spectra for DLC utilized to know the presence of bonding were characterized by scanning electron microscopy-SEM and energy dispersive x-ray -EDX. Deposited DLC-film has a compact structure of dense grains, and the film contained irregular shape particles (clusters) of DLC. FTIR-spectra confirmed that the DLC-film contains carbon atoms with sp3-hybridization.Were investigated in optical properties with the results concerning the transmittance, absorption coefficient-(α), optical energy-gap, reflectance-R, extinction coefficient-k and refractive index-n

Optical properties of TiO2 thin films prepared by reactive d.c. magnetron sputtering

TiO2 thin films were deposited by reactive d.c magnetron sputtering method on a glass substrate with various ratio of gas flow (Oxygen /Argon) (50/50, 100/50 and 150/50) at substrate temperature 573K. It can be observe that the optical energy gap of TiO2 thin films dependent on the ratio of gas flow (oxygen/argon), it varies between (3.45eV-3.57eV) also it is seen that the optical constants (α, n, K, εr and εi ) has been varied with the change of the ratio of gas flow (Oxygen /Argon)

<i style="mso-bidi-font-style:normal"><span style="mso-bidi-language:AR-IQ" lang="EN-US">AC</span></i><span style="mso-bidi-language: AR-IQ" lang="EN-US"> conductivity and dielectric behaviour of CuZnSnO₄ compound prepared by powder technology </span>

784-787A new type of oxides like CuZnSnO4 compound was synthesized by powder technology and pressed it as a pellet of 8.4 mm diameter and 1 mm thickness. X-ray diffraction patterns for the prepared samples have been studied. The behaviour of the dielectric (i.e. dielectric constant ε1 and dielectric loss ε2) and ac conductivity have been investigated. The sharply decrease of dielectric constant ε1 was noticed at low frequency range and was independent of frequency at high frequency range. Otherwise, the variation of the dielectric loss ε2 with frequency is shown and the absorption peak located at 120 Hz frequency at room temperature and moves to higher frequency with the increase of temperature. It was found that after critical frequency, ac conductivity logs increases nonlinearly with the increase of temperature but there is no variation at low frequency up to the critical frequency. The frequency exponent (s) is determined, and the data suggest that s increases with temperature. The variation of s with temperature suggests that ac conduction is due to the correlated barrier hopping. These data confirmed that this compound has good stability at high frequencies for waveguide devices and is useful as dielectric material at low frequencies. </span