{"id":14254,"date":"2026-09-22T13:19:02","date_gmt":"2026-09-22T10:19:02","guid":{"rendered":"https:\/\/en.csw.uobaghdad.edu.iq\/?p=14254"},"modified":"2026-09-22T13:22:09","modified_gmt":"2026-09-22T10:22:09","slug":"a-doctoral-dissertation-defended-at-the-college-of-science-for-women-investigates-the-role-of-rare-earth-oxide-nanoparticle-addition-in-the-fabrication-of-high-performance-room-temperature-semicondu","status":"publish","type":"post","link":"https:\/\/en.csw.uobaghdad.edu.iq\/?p=14254","title":{"rendered":": A Doctoral Dissertation Defended at the College of Science for Women Investigates the Role of Rare-Earth Oxide Nanoparticle Addition in the Fabrication of High-Performance Room-Temperature Semiconductor Metal Oxide Gas Sensors and Optimizing Their Sensitivity and Response\/Recovery Dynamics via Dual Doping with Silver Nanoparticles."},"content":{"rendered":"<div class=\"wpb-content-wrapper\"><p>[vc_row full_width=&#8221;stretch_row&#8221; rtl_reverse=&#8221;yes&#8221; css=&#8221;.vc_custom_1726859899671{margin-top: -150px !important;padding-top: 150px !important;padding-bottom: 60px !important;background-color: #f5f5f5 !important;}&#8221;][vc_column width=&#8221;1\/2&#8243;]<div class=\"cz_gap clr \" style=\"height: 50px\"><\/div><div id=\"cz_17562\" class=\"cz_17562 cz_title clr cz_mobile_text_center cz_title_pos_inline tac\"><div class=\"cz_title_content\"><div class=\"cz_wpe_content\"><p style=\"text-align: center;\"><span style=\"font-size: 38px;\"><span style=\"color: #102d5c;\"><span style=\"color: #f5c538;\">Dissertation <\/span><\/span><span style=\"color: #102d5c;\">Discussion<\/span><\/span><\/p>\n<p style=\"text-align: center;\">The College of Science for Women at the University of Baghdad discussed the Ph.D. dissertation entitled <strong>\u201cSynthesis and Characterization of (SnO<sub>2<\/sub>\/Y<sub>2<\/sub>O<sub>3<\/sub>): Ag Nanocomposite for Gas Sensor Applications\u201d<\/strong> submitted by the student <strong>Shaimaa Saadi Abdul-Halim<\/strong>.<\/p>\n<\/div><\/div><\/div><div class=\"relative\"><div id=\"cz_97039\" class=\"cz_97039 cz_line tal\"><\/div><\/div><div class=\"clr\"><\/div><div class=\"cz_gap clr \" style=\"height: 50px\"><\/div><div id=\"cz_81239\" data-arrows='{\"open\":\"fa fa-angle-down\",\"close\":\"fa fa-angle-up\"}' class=\"cz_81239 cz_acc clr\"><div><div id=\"cz_66389\"><span class=\"cz_acc_child\"><i class=\"cz-acc-i cz-acc-icon fa czico-052-three-2\"><\/i><div>Objectives of the Dissertation<\/div><\/span><div class=\"cz_acc_child_content clr\">[vc_column_text css=&#8221;&#8221;]The dissertation aimed to prepare thin films of tin oxide (SnO\u2082) and yttrium oxide (Y\u2082O\u2083) using the sol-gel and dip-coating techniques, and to investigate the effect of yttrium oxide concentration on the structural and morphological properties, as well as the optical band gap of tin oxide. The effect of these modifications on the sensing properties of the gas sensor toward oxidizing and reducing gases at room temperature was also investigated. In addition, the effect of different concentrations of silver (Ag) on the structure and properties of the prepared thin films was studied, as well as the effect of the optimum concentration on improving the optical band gap and gas-sensing performance.[\/vc_column_text]<\/div><\/div><div id=\"cz_18419\"><span class=\"cz_acc_child\"><i class=\"cz-acc-i cz-acc-icon fa czico-052-three-2\"><\/i><div>Content of the Dissertation<\/div><\/span><div class=\"cz_acc_child_content clr\">[vc_column_text css=&#8221;&#8221;]The dissertation also included the characterization of the thin films using X-ray diffraction (XRD), field-emission scanning electron microscopy (FE-SEM), energy-dispersive X-ray spectroscopy (EDX), atomic force microscopy (AFM), ultraviolet\u2013visible spectroscopy (UV\u2013Visible), and photoluminescence spectroscopy (PL) to investigate their structural, morphological, and optical properties.<\/p>\n<p>The results demonstrated the successful preparation of thin films with nanostructured compositions, which directly affected the surface roughness and increased the surface area of the films, as well as their optical band gap. A significant improvement was observed upon the addition of silver, which contributed to enhancing the gas-sensing performance toward parts-per-million (ppm) concentrations of oxidizing and reducing gases at room temperature. This consequently contributes to reducing energy consumption owing to the lower operating temperature of gas sensors fabricated based on these films.[\/vc_column_text]<\/div><\/div><div id=\"cz_15847\"><span class=\"cz_acc_child\"><i class=\"cz-acc-i cz-acc-icon fa czico-052-three-2\"><\/i><div>Dissertation Recommendations<\/div><\/span><div class=\"cz_acc_child_content clr\">[vc_column_text css=&#8221;&#8221;]<\/p>\n<ul>\n<li><strong>\u00a0<\/strong>The most important recommendations of the study are:\n<ul>\n<li>Investigating the effect of doping with other materials on the sensing properties.<\/li>\n<li>Investigating the effect of temperature and humidity on the gas-sensing behavior.<\/li>\n<li>Evaluating long-term stability.<\/li>\n<li>Investigating the variation in sensitivity with gas concentration.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>[\/vc_column_text]<\/div><\/div><div id=\"cz_57175\"><span class=\"cz_acc_child\"><i class=\"cz-acc-i cz-acc-icon far fa-image\"><\/i><div>Picture of the Committee members<\/div><\/span><div class=\"cz_acc_child_content clr\">[vc_column_text css=&#8221;&#8221;]<\/p>\n<div class=\"wp-block-image\"><img loading=\"lazy\" decoding=\"async\" class=\"wpa-warning wpa-image-missing-alt aligncenter size-large wp-image-14255\" src=\"https:\/\/en.csw.uobaghdad.edu.iq\/wp-content\/uploads\/sites\/97\/2026\/09\/WhatsApp-Image-2026-09-13-at-11.05.49-600x450.jpeg\" alt=\"\" width=\"600\" height=\"450\" data-warning=\"Missing alt text\" srcset=\"https:\/\/en.csw.uobaghdad.edu.iq\/wp-content\/uploads\/sites\/97\/2026\/09\/WhatsApp-Image-2026-09-13-at-11.05.49-600x450.jpeg 600w, https:\/\/en.csw.uobaghdad.edu.iq\/wp-content\/uploads\/sites\/97\/2026\/09\/WhatsApp-Image-2026-09-13-at-11.05.49-300x225.jpeg 300w, https:\/\/en.csw.uobaghdad.edu.iq\/wp-content\/uploads\/sites\/97\/2026\/09\/WhatsApp-Image-2026-09-13-at-11.05.49-768x576.jpeg 768w, https:\/\/en.csw.uobaghdad.edu.iq\/wp-content\/uploads\/sites\/97\/2026\/09\/WhatsApp-Image-2026-09-13-at-11.05.49.jpeg 1280w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/div>\n<p>[\/vc_column_text]<\/div><\/div><\/div><\/div>[vc_raw_js]JTNDc2NyaXB0JTNFJTIwdmFyJTIwdHJhbnNfcGFnZSUzRCUyMjU0MjAyJTIyJTIwJTNDJTJGc2NyaXB0JTNF[\/vc_raw_js][\/vc_column][vc_column width=&#8221;1\/2&#8243;]<div class=\"cz_gap clr \" style=\"height: 50px\"><\/div>[vc_single_image image=&#8221;14256&#8243; img_size=&#8221;700&#215;700&#8243; alignment=&#8221;right&#8221; css=&#8221;&#8221;][\/vc_column][\/vc_row]<\/p>\n<\/div>","protected":false},"excerpt":{"rendered":"<p>[vc_row full_width=&#8221;stretch_row&#8221; rtl_reverse=&#8221;yes&#8221; css=&#8221;.vc_custom_1726859899671{margin-top: -150px !important;padding-top: 150px !important;padding-bottom: 60px !important;background-color: #f5f5f5 !important;}&#8221;][vc_column width=&#8221;1\/2&#8243;][vc_raw_js]JTNDc2NyaXB0JTNFJTIwdmFyJTIwdHJhbnNfcGFnZSUzRCUyMjU0MjAyJTIyJTIwJTNDJTJGc2NyaXB0JTNF[\/vc_raw_js][\/vc_column][vc_column width=&#8221;1\/2&#8243;][vc_single_image image=&#8221;14256&#8243; img_size=&#8221;700&#215;700&#8243; alignment=&#8221;right&#8221; css=&#8221;&#8221;][\/vc_column][\/vc_row] &#8230; <\/p>\n","protected":false},"author":29,"featured_media":14256,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_lmt_disableupdate":"no","_lmt_disable":"","footnotes":""},"categories":[14,12],"tags":[],"class_list":["post-14254","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-doctorate","category-postgraduate-discussions"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.7 - 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