Document Details
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Document Type |
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Thesis |
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Document Title |
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Development of Toxic Chemical Sensors Based on Metal Oxide/Carbon Material Nanocomposites for Environmental Safety تطوير حساسات كيميائية للسمية مرتكزة على تراكيب متناهية الصغر من أكسيد الفلز ومادة الكربون لسلامة البيئة |
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Subject |
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Faculty of Sciences |
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Document Language |
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Arabic |
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Abstract |
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Simple, new, low cost, and highly sensitive chemical sensors, based on nanocomposite materials, were prepared for detection and determination of toxic hazardous chemicals. The preparation of the nanocomposite materials was performed by the wet-chemical method in alkaline medium (pH > 10). The nanocomposite materials were characterized by using different conventional methods, such as UV/vis. spectroscopy, FT-IR spectroscopy, X-ray photoelectron spectroscopy (XPS), Transmission electron microscopy (TEM) and X-ray diffraction pattern (XRD). In the sensors construction process, nanocomposite materials were immobilized as a film on the flat of a glassy carbon electrode (GCE; Surface area: 0.0316 cm2) using binders (5% nafion) to fabricate a selective chemical sensors toward toxins by electrochemical approaches. All the analytical performances, such as selectivity, sensitivity, detection limit, response time, stability and reproducibility were investigated in details for selective toxic chemicals by I-V method. ZnO–CNT NCs was prepared, which was selective for Xanthine. The sensitivity and detection limit were ∼59.14 μA cm−2 µM−1 and ∼0.16 nM (signal-to-noise ratio at an SNR of 3), respectively.
The fabricated Ag2O–CNT NCs chemical sensor exhibited higher sensitivity towards p-nitrophenol (103.89 µA µM−1cm−2) with a very low detection limit (LOD) of 0.091 nM, respectively. Mn3O4–CNT NCs was prepared and applied for the hydrazine detection. The sensitivity and detection limit were calculated as ~1100.0 µA µM−1cm−2 and 0.86 nM, respectively. CdO–CB NCs was prepared, which was selective for 4-aminophenol. The sensitivity and detection limit were calculated to be ~6.67 μA cm−2 µM−1 and 0.14 nM, respectively. CeO2–CNT NCs was prepared, which was selective for
4-methoxyphenol. The sensitivity of the 4-methoxyphenol detection was 47.56 μA cm−2 µM−1 and
the detection limit was found to be 0.012 µM (S/N ratio at an SNR of 3). Finally, these sensors were successfully applied for the detection of toxic hazardous chemicals for safety green environment and health care fields in broad scales. |
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Supervisor |
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Prof. Hadi M. Marwani |
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Thesis Type |
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Doctorate Thesis |
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Publishing Year |
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1438 AH
2017 AD |
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Added Date |
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Tuesday, July 18, 2017 |
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Researchers
| فيصل خويشان القثامي | Algethami, Faisal Khuwayshan | Researcher | Doctorate | |
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