In this work, electrochemical detection of ammonia solution (NH 4 OH) using sol-gel-synthesized t... more In this work, electrochemical detection of ammonia solution (NH 4 OH) using sol-gel-synthesized tin oxide (SnO 2) nanoparticles is investigated. Structural characteristics were studied using X-ray diffraction, scanning electron microscope and energy-dispersive X-ray spectroscopy that confirmed the formation of tin oxide nanoparticles. Optical characterizations were also studied via UV-Vis-IR spectroscopy and photoluminescence spectroscopy. After successful confirmation of sol-gel synthesis, these tin oxide nanoparticles were deposited on patterned copper substrate via thermal evaporator. Analysis for sensing ammonia solution was carried out using a three electrode system via electrochemical workstation. Electrochemical technique incorporates the results of cyclic voltammetry. The results confirmed that the SnO 2-deposited copper (Cu) platform successfully detect the presence of ammonia solution in double-distilled water. These results were further analyzed and compared with each indium tin oxide (ITO)-coated glass and pure copper substrate. Moreover, the tin oxide-deposited copper platform showed better performance than ITO substrate.
Background and Objective: Hearing impairment and ear discharge are the most common symptom an Oto... more Background and Objective: Hearing impairment and ear discharge are the most common symptom an Otorhinolaryngologist comes across in day to day practice. Chronis otitis media is the most common cause of hearing impairment and ear discharge. Thus chronic otitis media is a significant health problem in developing countries. Hence, every ENT surgeon should have thorough knowledge of the same. Material and Methods: We did a prospective study with the aim to study the characteristic clinical profile in patients diagnosed with chronic otitis media. All the patients were evaluated with detailed history taking and thorough clinical examination. Results: The majority of the patients presented with ear discharge (91%), second main symptom was decreased hearing in (65%), followed by ear ache in (29%), tinnitus in (17%) and giddiness in (7%) being the least. We observed that majority were medium sized perforation 72%. Involving the anteroinferior and posteroinferior quadrant. Conclusion: In the ...
Copper (Cu) doped p-CdS nanoparticles have been synthesized via sol-gel method. The as-synthesize... more Copper (Cu) doped p-CdS nanoparticles have been synthesized via sol-gel method. The as-synthesized nanoparticles were successfully characterized and implemented for fabrication of Glass/ITO/n-ZnO/p-CdS/Al thin film photodiode. The fabricated device is tested for small (−1 V to +1 V) bias voltage. Results verified that the junction leakage current within the dark is very small. During reverse bias condition, the maximum amount of photocurrent is obtained under illumination of 100 μW/cm 2. Electrical characterizations confirmed that the external quantum efficiency (EQE), gain and responsivity of n-ZnO/p-CdS photodiode show improved photo response than conventional p-type materials for such a small bias voltage. It is therefore revealed that the Cudoped CdS nanoparticles is an efficient p-type material for fabrication of thin film photo-devices.
In this work, electrochemical detection of ammonia solution (NH 4 OH) using sol-gel-synthesized t... more In this work, electrochemical detection of ammonia solution (NH 4 OH) using sol-gel-synthesized tin oxide (SnO 2) nanoparticles is investigated. Structural characteristics were studied using X-ray diffraction, scanning electron microscope and energy-dispersive X-ray spectroscopy that confirmed the formation of tin oxide nanoparticles. Optical characterizations were also studied via UV-Vis-IR spectroscopy and photoluminescence spectroscopy. After successful confirmation of sol-gel synthesis, these tin oxide nanoparticles were deposited on patterned copper substrate via thermal evaporator. Analysis for sensing ammonia solution was carried out using a three electrode system via electrochemical workstation. Electrochemical technique incorporates the results of cyclic voltammetry. The results confirmed that the SnO 2-deposited copper (Cu) platform successfully detect the presence of ammonia solution in double-distilled water. These results were further analyzed and compared with each indium tin oxide (ITO)-coated glass and pure copper substrate. Moreover, the tin oxide-deposited copper platform showed better performance than ITO substrate.
Background and Objective: Hearing impairment and ear discharge are the most common symptom an Oto... more Background and Objective: Hearing impairment and ear discharge are the most common symptom an Otorhinolaryngologist comes across in day to day practice. Chronis otitis media is the most common cause of hearing impairment and ear discharge. Thus chronic otitis media is a significant health problem in developing countries. Hence, every ENT surgeon should have thorough knowledge of the same. Material and Methods: We did a prospective study with the aim to study the characteristic clinical profile in patients diagnosed with chronic otitis media. All the patients were evaluated with detailed history taking and thorough clinical examination. Results: The majority of the patients presented with ear discharge (91%), second main symptom was decreased hearing in (65%), followed by ear ache in (29%), tinnitus in (17%) and giddiness in (7%) being the least. We observed that majority were medium sized perforation 72%. Involving the anteroinferior and posteroinferior quadrant. Conclusion: In the ...
Copper (Cu) doped p-CdS nanoparticles have been synthesized via sol-gel method. The as-synthesize... more Copper (Cu) doped p-CdS nanoparticles have been synthesized via sol-gel method. The as-synthesized nanoparticles were successfully characterized and implemented for fabrication of Glass/ITO/n-ZnO/p-CdS/Al thin film photodiode. The fabricated device is tested for small (−1 V to +1 V) bias voltage. Results verified that the junction leakage current within the dark is very small. During reverse bias condition, the maximum amount of photocurrent is obtained under illumination of 100 μW/cm 2. Electrical characterizations confirmed that the external quantum efficiency (EQE), gain and responsivity of n-ZnO/p-CdS photodiode show improved photo response than conventional p-type materials for such a small bias voltage. It is therefore revealed that the Cudoped CdS nanoparticles is an efficient p-type material for fabrication of thin film photo-devices.
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Papers by Mohammad Riyas