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Semiconductor Tin Oxide Gas Sensors : From Bulk to Thin Films
Mulla, Imtiaz Sirajuddin,Ramgir, Niranjan Suryakant,Hwang, Young Kyu,Chang, Jong-San 한국공업화학회 2004 Journal of Industrial and Engineering Chemistry Vol.10 No.7
Tin oxide an n-type semiconductor gas sensing material is widely accepted and under investigation in practically every form, from bulk to nano-structure. It is necessary to understand the ordering of crystal structure, morphology and arrangement of grains, importance of the surface effects and grain boundaries, and more importantly the working principle in order to visualize their potential as a sensor and electronic material. Therefore, it is necessary to consider each factor governing the sensitivity and selectivity prior to designing the sensor device. An ideal sensor with high mobility of conduction electrons and satisfactory stability needs fabrication of a highly porous, thin sensing body with a proper selection of doping element that can enhance surface reactions/adsorption of sensing gas. In the present report, we have tried to describe the recent progress in the tin oxide based gas sensors with some of our own findings.
Khalil Ahmed,Shaikh Sirajuddin Nizami,Nudrat Zahid Raza 한국공업화학회 2013 Journal of Industrial and Engineering Chemistry Vol.19 No.4
This paper discusses an extensive overview of characterization of marble sludge (MS) with carbon black (CB) and rice husk derived silica (RHS) in hybrid natural rubber (NR) composite. Cure characteristics,mechanical and swelling properties of MS/CB and MS/RHS hybrid NR composite were investigated. As CB and RHS content increases in weight ratio of MS/CB and MS/RHS a decrease in scorch and cure time and increase in the torque, tensile, tear, modulus, hardness, crosslink density were observed, while elongation at break and swelling coefficient decreased. The aging behavior of corresponding hybrid composite materials was also evaluated at two different temperatures.
Sufian Rasheed,Naseer Ahmad,Muhammad Anwar Ul Haq,Waqas Ahmad,Dilshad Hussain,Sirajuddin 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.128 No.-
The present work focuses on the synthesis and optimization of highly stable, bare silver nanoparticles(AgNPs) as colorimetric sensor for trace-level detection of omeprazole. A novel approach combiningAgNPs-based paper sensor and smartphone technology enables real-time analysis of omeprazole. Thecolor change observed by the naked eye and shift in localized surface plasmon resonance (LSPR) wereused to construct calibration curves. Both LSPR-based colorimetric sensing and paper-based sensingapproaches were utilized for omeprazole detection in complex matrices. The limits of detection (LODs)were determined as 15 nM and 240 nM, with linear dynamic ranges of 0.05–40 lM and 0.1–50 lM,respectively. Recovery studies demonstrated % recoveries within the acceptable range of 90–110% andrelative standard deviation (RSD) below 2%. Detailed characterizations including Fourier-TransformInfrared - (FTIR) Spectroscopy, Dynamic Light Scattering (DLS), zeta potential, Atomic ForceMicroscopy (AFM), and Field-Emission Scanning Electron Microscopy (FE-SEM) provided insights intosensing mechanism. This work offers a promising and practical solution for real-time omeprazole analysiswith potential applications extending beyond pharmaceutical formulations. The developed colorimetricsensor based on AgNPs demonstrates high stability, sensitivity, and versatility, making it suitable foron-site and point-of-care omeprazole detection in various samples, including serum, plasma, urine, seawater, and tap water.
Abdul Rehman Umar,Kashif Hussain,Zara Aslam,Muhammad Anwar Ul Haq,Haji Muhammadb,Sirajuddin,Muhammad Raza Shah 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.107 No.-
This work was initiated by synthesizing a carboxylic derivative of Calix[4]resorcinarene through a threestep protocol confirmed by proton nuclear magnetic resonance (1H NMR) spectroscopy and Electrosprayionization mass spectroscopy (ESI-MS). As synthesized derivative, was used as reducing and cappingmaterial for the fabrication of small and stable silver nanoparticles (AgNPs) in aqueous medium underthe combined influence of dilute alkali and heat at 90 C. These nanoparticles were referred as KM20-AgNPs. Techniques used for characterization of AgNPs include UV–Visible (UV–Vis) spectroscopy,Fourier transform infra-red (FTIR) spectroscopy, atomic force microscopy (AFM), dynamic light scattering(DLS) and zeta potential analyzer (ZPA). The finally produced KM20-AgNPs were recognized as highlysensitive and extremely selective voltammetric sensor for low level detection of methylene blue drugin the linear working range of 1–30 nM with limit of detection (LOD) and limit of quantification (LOQ)as 0.16 nM and 0.53 nM respectively. The developed sensor was successfully used for sensing of MB inhuman blood plasma.