Department of Physics
Permanent URI for this communityhttps://repository.cuilahore.edu.pk/handle/123456789/24
Browse
3 results
Search Results
Item Synthesis of Nickel Oxide (NiO) Fluorescence Nano Quencher and Their Application in Aptasensing of Ochratoxin-A(Library Information Services, COMSATS University Islamabad, Lahore Campus, 2019) Aqsa Khan; FA17-RPH -042; Dr. Rizwan Raza; LHR TP 5727The fabrication of fluorescence based biosensor for the ultra-sensitive and selective monitoring of Ochratoxin-A in the food samples is very important these days. We demonstrate for the first time, the development of nickel oxide nanoparticles (NiO) quenching based aptasensing platform for the detection of target molecule (OTA). In this work, NiO quench the fluorescence of FAM-labeled aptamer. These quenched intensities were due to energy transfer processes to the metal nanoparticles. Conversely, increase in fluorescence quenching intensities with a decrease in the size of the nanoparticles which may be useful for the design of new analytical tool to detect the presence of target analyte. The structural properties of prepared nano materials were analyzed by X- Ray diffraction (XRD).Surface morphology of prepared metal oxide nano materials were studied by Scanning Electron Microscopy (SEM) and crystalline behaviors size/shape was analyzed by RAMAN spectroscopy. We have found the cost-effective, easy to use and affordable method to design aptamer based fluorescence quenching assay for the detection and early diagnoses of mycotoxins (OTA).Item Smart Nitrite Sensor for Real Time Food and Water Quality Monitoring ‒ Improving Public Health(Library Information Services, COMSATS University Islamabad, Lahore Campus, 2019) AMINA SALEEM; CIIT/FA17-RPH-060/LHR; Dr. Rizwan Raza; LHR TP 5734In the preparation of CCE, SiO2 has been used as the support, due to its characteristics in forming very stable and mechanically resistant framework, resulting a porous structure of the support, a desirable characteristic in term of immobilization of electroactive species with good yield of surface density, silica has been the main component of the ceramic material. However, it is known that modification of the surface requires the presence of more active and reactive functional groups. On silica surface the reactive species are the silanol, Si-OH, groups. In this project the main objective is to study the synthesis, characterization and application of a new carbon ceramic, designated as SiO2/Al2O3/C (C= graphite). The technique of the conducting ceramic material was the sol-gel processing technique. The well characterized SiO2/Al2O3/C, modified with 3-n propylpyridinium silsesquioxane chloride functional groups, and tested as an electrochemical sensor of NO2 - in the environment. Nitrite plays an important role in environmental and biological processes, its monitoring is important since it is used as a food preservative against antimicrobial action. However, the presence of nitrite in food or drinking water can be hazardous to health, especially for infants and pregnant women, and, in the stomach, it can react with dietary components to form toxic and carcinogenic nitrosamines. The presence of nitrite in environmental samples, arising from industrial activities, indicates the extend of pollution and eutrophication of natural waters. So in this project, a novel nitrite sensor fabricated based on a SiO2/Al2O3/C/SiPy+Cl new conducting ceramic material. The degree of functionalization of the material determined by C, H, N elemental analysis and the local structure by 13C and 27Si SEM and diffuses reflectance Raman spectroscopies.Item Facile Synthesis of Nanostructured Bimetallic Mixed Oxides and their Electrochemical Characterization as Energy Storages Devices(Library Information Services, COMSATS University Islamabad, Lahore Campus, 2019) Muhammad Mudassir Hassan; CIIT/FA17-RPH-007/LHR; Dr. Rizwan Raza; LHR TP 5711Global warming is the major issue of our modern world. Thus, scientists and researchers are in search of more efficient and more environmental friendly energy materials. With the increasing development in the field of nanoscience and nanotechnology the modern world has transformed the old energy devices into more efficient and more sustainable energy devices. Therefore, there is a lot of need to find out more high performance energy storage devices. In this regard supercapacitor has a lot of potential to overcome the modern world Challenges. In this research work supercapacitor electrodes are prepared with improved energy density and power density. The material used in this research work for supercapacitor is Fe2(MoO4)3 which is a bimetallic mixed oxide. Sample is prepared by a facile hydrothermal method. The structural properties of the prepared sample are analyzed by the X-ray diffraction XRD. The XRD of the prepared sample shows the monoclinic crystal structure with average crystallite size of 68nm. To study the bonding between the atoms FTIR analysis is done. The results of FTIR shows the strong bonding between Fe and MoO4 ions. For electrochemical measurements 3 electrode system is used and two characterizations are done. CV of the prepared sample is done in two electrolytes to find out the best results. The CV curve shows the clear redox reactions occurring. As the scan rate is increased the current increases which confirms the fast electron transfer of electrons in the sample. GCD measurements shows that the sample has fast charging and discharging rate with excellent cyclability. The energy density and power density of the prepared sample was calculated to be 99.91 Wh/Kg and 5533.78 W/Kg respectively.