發(fā)布時間：2018-08-31 20:11

【摘要】：納米多孔金(NPG)是具有雙連通結構的納米級多空氣孔金薄膜。一方面,納米尺寸的無規(guī)則孔結構具有極大的比表面積,雙連通結構有助于氣體滲透;另一方面,與光波長相匹配的納米金絲結構使得NPG被光照射時,將會被激發(fā)產生表面等離激元和局域表面等離激元。利用納米多孔金屬材料的結構連續(xù)性、優(yōu)異的導電導熱性能和較高的比表面積、以及表面等離激元諸如場局域、亞波長等特異性質,NPG可以作為一個研究平臺在多領域進行基礎科學研究和應用。本文中,我們結合了NPG的上述特性進行了以下兩項研究:一,以NPG為生長模板通過原子層沉積技術沉積Sn O2經退火、去除模板后制備得到了具有雙聯通結構的Sn O2薄膜。經測試該薄膜表現出優(yōu)異的氣敏特性:氮氣氛圍下最低檢測極限達到了170 ppb,響應恢復時間分別為40 s/130 s;在空氣中檢測時,響應度增加了兩個數量級,表現出極高的響應度。通過對比氮氣氛圍和空氣氛圍下的氣敏測試結果,我們提出一種新的二氧化錫對二氧化氮響應的氣敏機制,我們的研究結果有助于進行進一步的高響應度氣敏傳感器的研究。二,通過將石墨烯和NPG進行復合,我們實現了石墨烯對量子點熒光淬滅效率的增強,該結果將可以提高利用石墨烯和熒光淬滅法檢測生物分子構象及動態(tài)學變化的靈敏度。我們的研究發(fā)現,NPG支撐石墨烯構成的復合結構在重新調整費米能級后提高了受主(石墨烯)接受位于激發(fā)態(tài)的施主(Cd Se量子點)電子的能力;此外光激發(fā)產生的表面等離激元提升了石墨烯的電子空穴對躍升幾率,促進了福斯特能量轉移和德克斯特電子轉移過程,因此大大提高了本征石墨烯的淬滅效率。這項研究對于制備高靈敏度的FRET生物傳感器具有參考價值。
[Abstract]:Nano porous gold (NPG) is a multi-pore gold film with double-connected structure. On the one hand, the irregular pore structure of nanometer size has a great specific surface area, and the double connected structure is helpful for gas permeation. On the other hand, when the nanocrystalline structure matched with the wavelength of light makes the NPG irradiated by light, The surface isophosphors and the local surface isophosphors will be excited. Using the structural continuity of nano-porous metal materials, excellent thermal conductivity and high specific surface area, as well as surface isotherms such as field, NPG can be used as a research platform for basic scientific research and application in many fields. In this paper, we have combined the above characteristics of NPG with the following two studies: first, Sn O 2 thin films with double interconnect structure have been prepared by using NPG as growth template and Sn O 2 deposited by atomic layer deposition after annealing, after removing the templates. The film shows excellent gas sensitivity: the minimum detection limit of 170 ppb, in nitrogen atmosphere is 40 s / 130 s, and the responsivity increases by two orders of magnitude in the air, showing a very high response. By comparing the results of gas sensing measurements in nitrogen atmosphere and air atmosphere, we propose a new gas sensing mechanism of tin dioxide response to nitrogen dioxide. Our results are helpful to the further study of high sensitivity gas sensors. Secondly, by combining graphene with NPG, we have realized the enhancement of fluorescence quenching efficiency of graphene to quantum dots, which will improve the sensitivity of graphene and fluorescence quenching method in detecting the conformation and dynamic changes of biomolecules. It is found that the composite structure supported by graphene increases the ability of the acceptor (graphene) to receive electrons from the excited donor (Cd Se quantum dots after adjusting the Fermi level. In addition, the surface isophosphoric element generated by photoexcitation increases the electron hole pair jumping probability of graphene, and promotes the process of Forst energy transfer and Dexter electron transfer, thus greatly improving the quenching efficiency of intrinsic graphene. This study has reference value for the preparation of high sensitivity FRET biosensors.
【學位授予單位】：上海師范大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TB383

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本文編號：2216041