Author
Muhammad Hassan Sayyad
Other affiliations: Dublin City University
Bio: Muhammad Hassan Sayyad is an academic researcher from Ghulam Ishaq Khan Institute of Engineering Sciences and Technology. The author has contributed to research in topics: Dye-sensitized solar cell & Thin film. The author has an hindex of 20, co-authored 93 publications receiving 1200 citations. Previous affiliations of Muhammad Hassan Sayyad include Dublin City University.
Papers published on a yearly basis
Papers
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TL;DR: In this article, the currentvoltage characteristics of Al/methyl-red/Ag surface-type structure were investigated in air at room temperature, using three different methods: conventional forward bias I-V method, Cheung functions and modified Norde's function.
Abstract: The current–voltage (I–V) characteristics of Al/methyl-red/Ag surface-type structure were investigated in air at room temperature. The conventional forward bias I–V method, Cheung functions and modified Norde's function were used to extract the diode parameters including ideality factor, barrier height and series resistance. The parameter values obtained from these three different methods were found in good agreement.
78 citations
TL;DR: In this article, a 300-nm-thick film of methyl-red was deposited by a spin coater at an angular speed of 2000 revolutions per minute (RPM) on a glass substrate with preliminary deposited metal electrodes to form the Ag/methyl-red/Ag surface type cell.
Abstract: This paper describes the experimental results for humidity-dependent resistive and capacitive response of methyl-red thin films in a Ag/methyl-red/Ag surface-type cell. A 300-nm-thick film of methyl-red was deposited from 10 wt% solution in benzene by a spin coater at an angular speed of 2000 revolutions per minute (RPM) on a glass substrate with preliminary deposited metal electrodes to form the Ag/methyl-red/Ag surface-type cell. The length and width of the gap between the electrodes were 50 μm and 15 mm, respectively. The resistance of the film reduced from 37 to 17 MΩ with an elevation of relative humidity level over the whole humidity range. It was also observed that under the effect of humidity, the capacitance of the methyl-red thin film increased by 12 times. The capacitive/resistive sensor has a quasi-linear function with relative humidity in the range of 30–95% and has a small hysteresis. The response and recovery time of the sensor was about 10 s for the capacitive sensor. The humidity-dependent resistive and capacitive properties of this sensor make it promising for use in a humidity meter.
72 citations
TL;DR: In this paper, a multilaser multichannel spectrometer system was developed that allows a wide range of investigations of the interaction of extreme-ultraviolet (EUV) photons with matter in the form of free atoms or ions, e.g., in gases or plasmas or bound as in solids.
Abstract: A new multilaser multichannel spectrometer system has been developed that allows a wide range of investigations of the interaction of extreme-ultraviolet (EUV) photons with matter in the form of free atoms or ions, e.g., in gases or plasmas or bound as in solids. The EUV photons are generated by a laser-produced plasma. Applications to the study of photoabsorption by thin foils, gases, and ground- and excited-state atoms and ions are described. The design and performance of a collimated, quasi-monochromatic, intense source of EUV radiation based on the combination of a laser-produced plasma with a EUV multilayer mirror is also reported.
50 citations
TL;DR: In this article, the electrical properties of Al/NiPc/Ag surface type Schottky diode fabricated by vacuum thermal evaporation have been investigated at room temperature in dark.
Abstract: Electrical properties of Al/NiPc/Ag surface type Schottky diode fabricated by vacuum thermal evaporation have been investigated. The current–voltage (I–V) and capacitance–voltage (C–V) characteristics are measured at room temperature in dark. The electronic parameters such as ideality factor, barrier height, series resistance and shunt resistance of the Schottky diode are calculated from the current–voltage and capacitance–voltage characteristics. The charge carrier concentration and built in potential values of 9.1×1015 cm−3 and 1.6 V, respectively, are obtained from the C–V plot. The value of conductivity and mobility has also been calculated. In addition, the values of ideality factor and series resistance are also verified by using Cheung's function. Frequency-dependent measurements on this Schottky barrier diode show that the capacitance is reduced at high frequency.
47 citations
TL;DR: In this paper, an organic semiconductor Zn(II) 5,10,15,20-tetrakis(4′-isopropylphenyl) porphyrin (ZnTIPP) was used as an active material in a surface type sensor.
Abstract: In this paper, we have reported the synthesis and use of an organic semiconductor Zn(II) 5,10,15,20-tetrakis(4′-isopropylphenyl) porphyrin (ZnTIPP) as an active material in a surface type sensor. Ag/ZnTIPP/Ag sensor was fabricated by thermal sublimation of ZnTIPP on a glass substrate with preliminary deposited surface type silver electrodes. Semiconducting channel between silver electrodes was 0.04 mm × 15 mm. Changes in electrical measurements of the device were observed with increase of relative humidity, illumination, and temperature. A small degree of hysteresis and acceptable response and recovery times were observed over a wide range of relative humidity. Activation energy of the ZnTIPP was estimated.
40 citations
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TL;DR: In this paper, a sedimentological core and petrographic characterisation of samples from eleven boreholes from the Lower Carboniferous of Bowland Basin (Northwest England) is presented.
Abstract: Deposits of clastic carbonate-dominated (calciclastic) sedimentary slope systems in the rock record have been identified mostly as linearly-consistent carbonate apron deposits, even though most ancient clastic carbonate slope deposits fit the submarine fan systems better. Calciclastic submarine fans are consequently rarely described and are poorly understood. Subsequently, very little is known especially in mud-dominated calciclastic submarine fan systems. Presented in this study are a sedimentological core and petrographic characterisation of samples from eleven boreholes from the Lower Carboniferous of Bowland Basin (Northwest England) that reveals a >250 m thick calciturbidite complex deposited in a calciclastic submarine fan setting. Seven facies are recognised from core and thin section characterisation and are grouped into three carbonate turbidite sequences. They include: 1) Calciturbidites, comprising mostly of highto low-density, wavy-laminated bioclast-rich facies; 2) low-density densite mudstones which are characterised by planar laminated and unlaminated muddominated facies; and 3) Calcidebrites which are muddy or hyper-concentrated debrisflow deposits occurring as poorly-sorted, chaotic, mud-supported floatstones. These
9,929 citations
03 Jan 2020
TL;DR: The metal oxides have been of great importance to the development of energy conversion and storage technologies including heterojunction solar cells, Li-ion batteries, and electrocatalysts/photocatalys.
Abstract: Metal oxides have been of great importance to the development of energy conversion and storage technologies including heterojunction solar cells, Li-ion batteries, and electrocatalysts/photocatalys...
408 citations
TL;DR: In this article, the authors reviewed the humidity sensors based on ceramic materials and analyzed state-of-the-art techniques for producing ceramic sensors, and the key research and technological challenges in the field are discussed at the end of the review.
Abstract: We have reviewed the humidity sensors based on ceramic materials. We first discuss the operating principle of ceramic humidity sensors. This is followed by a section on the relationship between the conduction mechanism and microstructure characteristics of the sensing elements of ceramic humidity sensors. This part of the review is also focused on the methods for optimization of the microstructure of ceramic porous elements. The next section summarizes the information on the materials used for the ceramic humidity sensors fabrication and effect of dopants or hybrid compositions on the sensing ceramic-based materials. Then we analyze state-of-the-art techniques for producing ceramic sensors. The key research and technological challenges in the field are discussed at the end of the review. The review is based on 424 references published during from 1998–2013.
378 citations
01 Jan 2018
TL;DR: In this article, the authors describe a window of opportunity for window-of-opportunity, where the window is a window-window of opportunity window for a specific target.
Abstract: ▪ 関節リウマチ（RA）の骨破壊が発症後2 年以内に進行することが報告されて以降，windowof opportunity（治療効果が高いと考えられている発症早期の限られた期間）を意識した治療管理が提唱されてきた．▪ 米国リウマチ学会（ACR）は2008 年の推奨で病歴6 ヵ月未満のRA を早期RA と定義し，生物学的製剤を含む積極的な管理を提案した．▪ 2010 年にはRA の分類基準が改定され，治療開始の基準が治療者の間で共有された．RA を目標達成に向けて治療するという指針，treat to target （T2T）が提唱され，以降国際的な基本方針になった．
313 citations
TL;DR: In this article, a scalable and efficient fabrication strategy is adopted to yield a sensor consisting of ZnO nanowires and polyurethane fibers, which integrates high stretchability (tolerable strain up to 150%) with three different sensing capabilities, i.e., strain, temperature and UV.
Abstract: Stretchable and multifunctional sensors can be applied in multifunctional sensing devices, safety forewarning equipment, and multiparametric sensing platforms. However, a stretchable and multifunctional sensor was hard to fabricate until now. Herein, a scalable and efficient fabrication strategy is adopted to yield a sensor consisting of ZnO nanowires and polyurethane fibers. The device integrates high stretchability (tolerable strain up to 150%) with three different sensing capabilities, i.e., strain, temperature, and UV. Typically achieved specifications for strain detection are a fast response time of 38 ms, a gauge factor of 15.2, and a high stability of >10 000 cyclic loading tests. Temperature is detected with a high temperature sensitivity of 39.3% °C−1, while UV monitoring features a large ON/OFF ratio of 158.2. With its fiber geometry, mechanical flexibility, and high stretchability, the sensor holds tremendous prospect for multiparametric sensing platforms, including wearable devices.
228 citations