基于纳米多孔金体系的传感及荧光淬灭的研究
发布时间：2018-08-31 20:11
【摘要】：纳米多孔金(NPG)是具有双连通结构的纳米级多空气孔金薄膜。一方面,纳米尺寸的无规则孔结构具有极大的比表面积,双连通结构有助于气体渗透;另一方面,与光波长相匹配的纳米金丝结构使得NPG被光照射时,将会被激发产生表面等离激元和局域表面等离激元。利用纳米多孔金属材料的结构连续性、优异的导电导热性能和较高的比表面积、以及表面等离激元诸如场局域、亚波长等特异性质,NPG可以作为一个研究平台在多领域进行基础科学研究和应用。本文中,我们结合了NPG的上述特性进行了以下两项研究:一,以NPG为生长模板通过原子层沉积技术沉积Sn O2经退火、去除模板后制备得到了具有双联通结构的Sn O2薄膜。经测试该薄膜表现出优异的气敏特性:氮气氛围下最低检测极限达到了170 ppb,响应恢复时间分别为40 s/130 s;在空气中检测时,响应度增加了两个数量级,表现出极高的响应度。通过对比氮气氛围和空气氛围下的气敏测试结果,我们提出一种新的二氧化锡对二氧化氮响应的气敏机制,我们的研究结果有助于进行进一步的高响应度气敏传感器的研究。二,通过将石墨烯和NPG进行复合,我们实现了石墨烯对量子点荧光淬灭效率的增强,该结果将可以提高利用石墨烯和荧光淬灭法检测生物分子构象及动态学变化的灵敏度。我们的研究发现,NPG支撑石墨烯构成的复合结构在重新调整费米能级后提高了受主(石墨烯)接受位于激发态的施主(Cd Se量子点)电子的能力;此外光激发产生的表面等离激元提升了石墨烯的电子空穴对跃升几率,促进了福斯特能量转移和德克斯特电子转移过程,因此大大提高了本征石墨烯的淬灭效率。这项研究对于制备高灵敏度的FRET生物传感器具有参考价值。
[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.
【学位授予单位】：上海师范大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TB383
本文编号：2216041
[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.
【学位授予单位】：上海师范大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TB383
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