- 學位論文
氣凝合成法製備一維氮化硼奈米材料及其特性之研究
Study on Properties of One-Dimension Boron Nitride Nanomaterials Prepared by a Gas Condensation Technique
摘要
本研究係利用電漿電弧氣凝合成法來製備氮化硼奈米材料，分別探討不同腔體壓力（200~600 torr）、生成時間（20sec~3min）對於產物的形貌、相態影響，且針對一維氮化硼奈米材料的光學及場發射特性進行分析與探討。研究中發現，隨著腔體壓力降低及生成時間增加，氮化硼形貌不但會由片狀結構逐漸轉變成一維奈米結構，而且一維奈米結構數量會逐漸增多，長度可達數百微米。微結構分析得知，隨著生成時間增加開始出現h-BN相態，晶格成長方向是沿著(0002)晶面成長，並由HRTEM的結果得知晶格間距(d-spacing)為0.33nm，成長機制可透過氣-固相(Vapor-Solid, VS)法解釋。 研究結果顯示，純化過後的一維氮化硼奈米材料光吸收波長為256nm，接近近紫外光區，其能隙為4.84eV，進一步透過螢光激發光譜得知分別會在紫外光(297nm、374nm)波段以及黃光(515~542nm)位置產生發光現象。場發射量測結果顯示，一維氮化硼奈米材料的場發射起始電場為4.49 V/μm。 因此，本研究利用氣凝合成法在不需要添加觸媒的條件下成功製備出一維氮化硼奈米材料，而且實驗所合成的一維氮化硼奈米材料同時具有發光及場發射的特性，未來可作螢光材料、UV設備或是場發射元件等應用。
並列摘要
In the present study, boron nitride materials were synthesized by a modified plasma arc gas condensation technique. The effects of the chamber pressures (200~600 torr), production time (20sec~3min), on the preparation of boron nitride nanostructures were investigated. The optical and field emission characteristics of boron nitride one-dimension boron nitride nanomaterials were also examined. Study found that as the chamber pressure reduction and production time increased, not only by the morphology of BN sheet has been transforming into an one-dimensional structure, and the one-dimensional structure of a number will gradually increase, length up to several hundred microns. X-ray diffraction results showed that the increase in generation time, began to emerge as the h-BN phase, lattice along the growth direction is (0002) face growth of crystals by HRTEM results reveal that spacing of 0.33nm, its growth mechanism is Vapor-Solid solidly (VS) the physiognomy explanation. The results showed that after purification of one-dimensional BN nanomaterials absorption wavelength of 256nm, close to the near ultraviolet region, the band gap is 4.84eV. Photolumeinscence emission at ultraviolet-visible (297nm、374nm) and the yellow (515~542nm) regions are luminous phenomenon produced. The turn-on field of BN one-dimensional nanomaterials is 4.49 V/μm. Therefore, this study uses synthetic gas condensate do not need to add in catalyst was successfully prepared under the conditions of one-dimensional BN nanomaterials, and the laboratory synthesis of one-dimensional BN nanomaterials both light and field emission characteristics, the future can be used for fluorescent materials, UV equipment, or field emission device applications.