Mat Akhir, Maisara Azad (2016) Development of nanostructured gas sensing material as an ethylene gas detector. Masters thesis, Universiti Sains Malaysia.
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Abstract
Gas etilena adalah bahan penting dalam pemasaran produk pertanian segar kerana ia boleh digunakan secara komersial untuk hormon tanaman tiruan, mengawal dan memantau proses pemasakan buah-buahan klimaterik. Menyedari kepentingan alat pengesan gas etilena untuk proses pemasakan buah-buahan, banyak kajian telah dijalankan untuk mengkaji pengaruh gas etilena dalam proses pemasakan tanaman. Nanopartikel tin oxida (SnO2) adalah bahan yang paling popular untuk mengesan gas etilena kerana ia adalah semikonduktor jenis n yang mempunyai jalur jurang yang luas, justeru itu, menyebabkan rintangan elektrik yang rendah dan pengkonduksian elektrik yang lebih baik untuk alat pengesan gas. Tambahan pula, suhu operasi yang rendah, kepekaan yang tinggi, reka bentuk sensor yang ringkas serta kos pembuatan yang rendah membuat SnO2 pilihan terbaik untuk aplikasi pengesan gas. Dalam penyelidikan ini, pemendapan wap kimia (CVD) dan kaedah hidroterma telah digunakan untuk mensintesis nano-struktur SnO2 (SnO2 NSs). Sintesis, pencirian bahan dan sifat-sifat pengesan gas etilena telah dikaji dengan menggunakan nano SnO2. Pertama sekali, nano-wayar (NWs) SnO2 telah disintesis di atas substrat silikon dengan menggunakan kaedah CVD. Ethylene gas is an important substance in fresh argo-products marketing because it can be used commercially for artificial plant hormone and to monitor the ripening process of climacteric fruits. Realizing the importance of ethylene gas sensor for fruit ripening process, many studies have been carried out in order to investigate the influence of ethylene to the ripening process. Tin oxide (SnO2) nanoparticles are the most popular material for ethylene gas sensor due to its wide band gap n-type semiconductor properties, which leads to low electrical resistance and better electrical conductivity for gas sensing properties. Furthermore, low operating temperature, high sensitivity, mechanical simplicity of sensor design and low manufacturing cost have made SnO2 the preferred choice for gas sensor applications. In this work, chemical vapor deposition (CVD) and hydrothermal methods were utilized to synthesize SnO2 nanostructures (NSs). The synthesis, material characterizations and the gas sensing properties of SnO2 NSs against ethylene gas had been studied. Firstly, SnO2 nanowires (NWs) were grown on silicon substrates by using CVD method.
| Item Type: | Thesis (Masters) |
|---|---|
| Subjects: | T Technology > TN Mining Engineering. Metallurgy > TN263-271 Mineral deposits. Metallic ore deposits. Prospecting T Technology > TN Mining Engineering. Metallurgy > TN275-325 Practical mining operations. Safety measures |
| Divisions: | Kampus Kejuruteraan (Engineering Campus) > Pusat Pengajian Kejuruteraan Bahan & Sumber Mineral (School of Material & Mineral Resource Engineering) > Thesis |
| Depositing User: | Mr Badli Syahar Bakhtier |
| Date Deposited: | 12 Apr 2017 01:49 |
| Last Modified: | 12 Apr 2019 05:25 |
| URI: | http://eprints.usm.my/id/eprint/32997 |
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