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dc.contributor.author郭哲余en_US
dc.contributor.authorKuo, Che-Yuen_US
dc.contributor.author庄振益en_US
dc.contributor.authorJuang, Jenh-Yihen_US
dc.date.accessioned2014-12-12T01:49:33Z-
dc.date.available2014-12-12T01:49:33Z-
dc.date.issued2012en_US
dc.identifier.urihttp://140.113.39.130/cdrfb3/record/nctu/#GT079821553en_US
dc.identifier.urihttp://hdl.handle.net/11536/47484-
dc.description.abstract本研究中,我们利用固态烧结法制备掺杂碳的二氧化钛粉末,再使用油压机和箱形炉来对粉末加压和加热,使其成为块材。接着我们使用脉冲雷射镀膜系统进行镀膜,并在一系列成长条件下探讨碳掺杂对二氧化钛磁性造成的效应和机制。我们发现掺杂碳的二氧化钛有明显的磁滞曲线,显示碳掺杂确实会形成室温铁磁性。本论文藉由C-1s和Ti-2p之XPS量测,发现薄膜中有钛和碳的键结与氧空缺,显示掺碳二氧化钛的铁磁性来源,是由氧空缺与杂质间相互作用所产生。从O-1s的XPS也可以看出,掺杂碳可使氧空缺变多,此可能进而产生更多电子。本实验也发现随着碳的掺杂浓度增加,铁磁性并未维持一直增加的趋势,甚至反而减弱材料的室温铁磁性,本论文亦将对此现象,提出初步的解释。zh_TW
dc.description.abstractCarbon-doped titanium dioxide powders was prepared by solid state sintering at 1200 o C for 24hrs to produce TiO2 bulks with different carbon doping concentrations. The obtained TiO2 bulks were then used to deposit TiO2 thin films by pulsed laser deposition. The effects of carbon doping was investigated via a series of films obtained at various deposition conditions. The results indicate that the carbon-doped titanium dioxide evidently exhibit significant magnetization hysteresis at room temperature, indicating the realization of room-temperature ferromagnetism (RTFM).
Further X-ray photoelectron spectroscopy (XPS) analysis on C-1s, O-1s, and Ti-2p electronic states showed the existence of Ti-C bonding and significant
amount of oxygen vacancies. These results lend support to the p-p interaction, induced ferromagnetism in these oxides. The observed RTFM, however, did not increase with increasing doping concentration of carbon, presumably due to the excessive free carbon-induced diamagnetism.
en_US
dc.language.isoen_USen_US
dc.subject二氧化钛zh_TW
dc.subject超导量子干涉仪zh_TW
dc.subject铁磁性zh_TW
dc.subject电子能谱仪zh_TW
dc.subject脉冲雷射镀膜zh_TW
dc.subject吸收光谱zh_TW
dc.subjectTiO2en_US
dc.subjectSQUIDen_US
dc.subjectFerromagneticen_US
dc.subjectXPSen_US
dc.subjectPLDen_US
dc.subjectXANESen_US
dc.title掺杂不同浓度碳的二氧化钛薄膜之电子结构与磁性研究zh_TW
dc.titleResearch of magnetism in carbon –doped TiO2 thin films with different doping concentrationen_US
dc.typeThesisen_US
dc.contributor.department电子物理系所zh_TW
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