Syed A. Malik

Determination of Morphology of Poly(3-hexythiophene) with Nanosphere- and Nanorod-Shape of Zinc Oxide

Morphology of thin film poly (3-hexylthiophene) (P3HT) embedded with nanosphere-and nanorod-shape Zinc Oxide (ZnO) has been studied. We deposited the materials on quartz substrate using spin coating technique. The morphology of P3HT: ZnO thin films were investigated using Field Emission Scanning Electron Microscopy (FESEM), Energy-dispersive X-ray emission spectroscopy (EDX) and RAMAN Spectroscopy and compared. Based on size and shape of both ZnO, it can be seen that nanospheres in P3HT was found to be better than ZnO nanorods in P3HT.

Properties of Calix4-Lead(Pb) Films Using Langmuir-Blodgett (LB) Technique as an Application of Ion Sensor

Calixarenes are promising compounds to be used as ionophores and for molecular recognition. Their ability to form Langmuir and Langmuir-Blodgett (LB) films is of great interest in order to obtain small sensor devices which incorporate an active nanometric film. Calix[4]arene (Calix4) has been used in this work and its ability to form Langmuir films has been shown. Calix4 forms monolayers but at higher compressions tends to form multilayers. The presence of ions in the subphase, as lead chloride salt solutions, leads to some changes in the surface pressure-area (П-A) isotherms and surface potential-area (ΔV-A) isotherms. The effective dipole moments (μ) of the calixarene molecules in the uncomplexed and complexed states has been calculated from the ΔV values by using Helmholtz equation. Some characteristics of the films and mean molecular area have been deduced from the isotherms graph.

Hybrid conjugated polymer/quantum dots thin films for electronics application

Thirteen layers of P3HT/stearic acid films have been deposited using angle lifting deposition technique onto ITO coated glass substrate at constant surface pressure. Gas exposure method was employed to embed semiconducting nanoparticles in the P3HT/SA matrixes. The isotherm of composite P3HT/SA shows a unique trend combination of small molecules of stearic acid and long chain polymer. UV-Vis result revealed the presence of CdS quantum dots in between P3HT/SA matrices. After subtracting the spectra before and after gas exposure, it was found that the CdS peak is at 420 nm, indicating the size of quantum dots created is around 4nm.