Ghulam Ishaq Khan Institute of Engineering Sciences and Technology

About: Ghulam Ishaq Khan Institute of Engineering Sciences and Technology is a education organization based out in Topi, Pakistan. It is known for research contribution in the topics: Thin film & Quantum efficiency. The organization has 618 authors who have published 940 publications receiving 10674 citations.

A novel and stable ultraviolet and infrared intensity sensor in impedance/capacitance modes fabricated from degraded CH3NH3PbI3-xClx perovskite materials

Abstract: The present situation of COVID-19 diverted our focus towards utilizing the degraded solar cells for sensor application, this will help in global energy harvesting So, here is our successful effort to reuse already degraded solar cells as ultraviolet (UV) and infrared (IR) sensor The spin-coated perovskite (CH3NH3PbI3-XClX) has been already tested for visible light spectrum, as an extension to that now it is utilized as UV and IR intensity sensors to cover the whole spectrum The employed CH3NH3PbI3-XClX material was used after its efficiency loss has been reached to a saturation point in photovoltaic devices Each deposited layer was investigated from UV to the IR absorption spectrum for deepening study through UV-vis spectroscopy In the sandwiched architecture possessing FTO/PEDOT: PSS/Perovskite/PC61BM/CdS/Au symmetry, the perovskite film has been employed as an absorbent layer, however, other layers participation also plays a key role The resultant device yielded very good sensing performance because of the enhanced excitons generation which is attributed to the precise selection of the interfacial materials, e g CdS and PC61BM as an ETM and PEDOT: PSS as HTM The impedance and capacitance of the devices within 0 01-200 kHz under varied UV and IR illumination intensities were investigated Measurements showed that as the intensity of the light increased i e , UV (0-200 W/m2) and IR (0-5800 W/m2), impedance decreased while capacitance increased The current results are attributed to the increase in the concentration of charges i e , electron-hole pairs generation depending on the built-in capacitance and frequency of the charges © 2020 The Authors

Cholesterol immobilization on chemical vapor deposition grown graphene nanosheets for biosensors and bioFETs with enhanced electrical performance

Abstract: The intensive bio-effects on graphene surface is an attention-grabbing field which determine the capability of performing rapid detection of biomolecules with high accuracy. Here, we report the electrical performance of graphene devices with the immobilization of cholesterol molecules. In electrical transport measurements, the Dirac point position is gradually shifted towards negative gate voltage as cholesterol concentration increases which reveals the clear influence of cholesterol molecules on the graphene. This graphene surface modifications induce n-type doping and the charge carrier mobility is increased from ∼2000 cm 2 V −1 s −1 to ∼3900 cm 2 V −1 s −1 by increasing the cholesterol concentration. The detection of cholesterol molecules is further investigated by Raman spectroscopy, FTIR and AFM characterizations. The results indicate significant impact of cholesterol-graphene interaction on the performance of graphene devices. Furthermore, sensing approach can be quantitatively deployed for commercial use of portable graphene-based cholesterol sensing devices for biomedical applications.

Microstructural study on oxidation of aluminized coating on inconel 625

Abstract: The high-temperature oxidation behavior of aluminized Inconel 625 has been examined using scanning electron microscopy (SEM) and fine-probe spot and linescan energy dispersive spectroscopy (EDS) microanalysis techniques. The formation of adherent slowly growing metallic coatings is essential for protection against severe environments. The coated (aluminized) and uncoated samples were subsequently oxidized in air at 1000 and 1100 °C to examine the performance of the aluminized coating. The micro-structural changes that occurred in both coated and uncoated samples were examined. It was found that coated samples showed superior performance against high-temperature oxidation, as compared to the uncoated samples. The coated samples revealed uniform and adherent oxidized layer, as compared to the uncoated samples. The oxidation behavior and multilayered microstructural morphology observed in the coated samples can be attributed to the interdiffusion and variation in kinetics of oxidation.

Plants Species Selection for Afforestation: A Case Study of the Billion Tree Tsunami Project of Pakistan

Abstract: Afforestation is one potential action for improving the environment from local to global scales. Deforestation plagues many regions of the world and in recent times, there are ongoing efforts by so...