Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/97883
標題: 硫化鉛膠體量子點在氣體感測之研究
Study of PbS Colloidal Quantum Dots in Gas Sensor
作者: 李御寧
Yu-Ning Li
關鍵字: 量子點
硫化鉛
氣體感測
Quantum dots
Lead Sulfide
gas sensor
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摘要: 量子點具備傳統材料所沒有的特性,當粒徑不同時能隙也會不同且量子點具有相當大的接觸面積,這對於氣體的吸附有相當大的優勢,並選為本次研究的氣體感測材料。 本次研究採用熱注入法合成硫化鉛膠體量子點(Lead Sulfide Colloidal Quantum Dots, PbS CQDs)並塗覆在基板上形成薄膜量子點。 利用紫外-可見光光譜儀、X光繞射、掃描式電子顯微鏡以及穿透式電子顯微鏡觀測材料特性。X光繞射圖譜中發現與標準卡(JCPDS 01-078-1057)是吻合的,而在掃描式電子顯微鏡中薄膜表面的孔洞證實亞硝酸鈉(NaNO3)是能夠有效的去除表面油基來達到吸附氣體。在無照光下通入臭氧探討其電性變化,當濃度愈高時反應愈好但高濃度的脫附時間也比較久,為縮短脫附時間嘗試照光的方法來探討。
The quantum dots have the special characteristic that the traditional materials do not have. The sizes of different particle have the different energy gap. Large surface area is an advantage for the gas adsorption. Base on this view, we choose quantum dots as our material in this work. In this study, the Lead Sulfide Colloidal Quantum Dots (PbS CQDs) are synthesized by hot injection method and prepare the film by spin coating. Material characteristics were observed UV-vis Spectrum, X-ray diffraction, Scanning Electron Microscope and Transmission Electron Microscope. The X-ray diffraction pattern was consistent with JCPDS and the pores on the surface of the film in the scanning electron microscope confirmed that sodium nitrite (NaNO3) was effective in removing surface oil groups. The electrical properties of PbS films were measured for sensing ozone gas with and without LED irradiation. It had better reaction and longer desorption time when higher concentration. To try to shorten the desorption time and use illuminate.
URI: http://hdl.handle.net/11455/97883
文章公開時間: 2021-08-30
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