基于側(cè)邊拋磨光纖的表面等離子體共振折射率傳感器
發(fā)布時(shí)間：2018-08-20 18:14
【摘要】：表面等離子體共振傳感技術(shù)是近代物理學(xué)、化學(xué)、生物醫(yī)學(xué)、環(huán)境科學(xué)等多學(xué)科高度交叉的新興檢測(cè)技術(shù),具有無(wú)需標(biāo)記、響應(yīng)速度快、靈敏度高、分辨率高、抗電磁干擾能力強(qiáng)等優(yōu)點(diǎn),因而廣泛應(yīng)用于疾病診斷、食品安全、環(huán)境監(jiān)測(cè)、藥物篩查等檢測(cè)領(lǐng)域。光纖SPR傳感器體積輕巧、檢測(cè)成本低、可進(jìn)行遠(yuǎn)程在線監(jiān)測(cè),并易于復(fù)用及組網(wǎng),代表了未來(lái)SPR傳感系統(tǒng)便攜化、網(wǎng)絡(luò)化、在線遠(yuǎn)程監(jiān)測(cè)的發(fā)展方向,成為近年來(lái)各國(guó)研究人員關(guān)注的熱點(diǎn)�；趥�(cè)邊拋磨光纖的SPR傳感器具有結(jié)構(gòu)簡(jiǎn)單、成本低、鍍膜均勻性好、傳感性能高等優(yōu)勢(shì),是一種具有較大潛力可實(shí)用化的光纖SPR傳感器。相對(duì)于研究報(bào)道較多的基于金膜的金-SPR傳感器,基于銀膜的銀-SPR傳感器性能更優(yōu)而且成本較低。然而,銀在環(huán)境中容易發(fā)生氧化、硫化等退化反應(yīng),銀-SPR傳感器的穩(wěn)定性降低,其應(yīng)用受到限制。本文將圍繞高性能、低成本的銀-側(cè)邊拋磨光纖SPR傳感器,研究銀-SPR光纖傳感器的制備、優(yōu)化及折射率傳感響應(yīng)特性,并對(duì)由銀膜退化引起的傳感器性能衰退進(jìn)行定量研究。進(jìn)一步地,文中通過(guò)表面自組裝方法,采用氧化石墨烯對(duì)側(cè)邊拋磨光纖SPR傳感器進(jìn)行表面修飾,改善了銀-SPR傳感器的穩(wěn)定性及折射率響應(yīng)特性。本論文的主要工作包括如下內(nèi)容:1)研究了側(cè)邊拋磨光纖的制備方法、參數(shù)優(yōu)化及其傳感響應(yīng)性能。采用輪式機(jī)械光纖研磨法,基于普通單模光纖的精拋工藝,制作得到表面質(zhì)量良好、器件參數(shù)精確可控的側(cè)邊拋磨光纖,為下一步SPR折射率傳感器的研究與制備提供了光纖倏逝場(chǎng)基底。文中探索了快速研磨光纖的粗磨工藝,采用傳輸光譜在線監(jiān)控系統(tǒng)精確控制光纖的拋磨進(jìn)程,制作出表面帶有大量平行劃痕的粗磨側(cè)邊拋磨光纖�；诖帜ス饫w傳輸光譜的FFT分析及表面形貌結(jié)構(gòu)表征,提出了馬赫-曾德干涉結(jié)構(gòu)模型解釋粗磨光纖的干涉現(xiàn)象,通過(guò)參數(shù)優(yōu)化獲得了干涉諧振峰對(duì)比度大于10 d B的粗磨側(cè)邊拋磨光纖,并對(duì)其溫度、軸向應(yīng)力、酒精氣體濃度,以及液體折射率的傳感響應(yīng)特性進(jìn)行了測(cè)試。2)在具有良好表面質(zhì)量的側(cè)邊拋磨光纖上,采用真空熱蒸鍍法淀積了厚度為納米量級(jí)的銀膜,制備出銀-側(cè)邊拋磨光纖SPR傳感器,并對(duì)光纖的剩余厚度、拋磨長(zhǎng)度、功率損耗銀膜厚度等影響傳感器性能的關(guān)鍵參數(shù)進(jìn)行了實(shí)驗(yàn)優(yōu)化。自行搭建了光纖SPR在線測(cè)試平臺(tái),測(cè)試了銀-側(cè)邊拋磨光纖SPR傳感器的折射率響應(yīng)性能,通過(guò)靈敏度、諧振峰半高寬、分辨率、器件優(yōu)化指標(biāo)等參數(shù)對(duì)傳感器的性能進(jìn)行了分析討論。作為本部分的創(chuàng)新點(diǎn),文中對(duì)制約銀-SPR傳感器實(shí)際應(yīng)用的傳感性能退化問(wèn)題進(jìn)行了研究,分析了銀-SPR傳感器在空氣、液體中由于銀膜退化而引起的傳感性能衰退,為銀-SPR傳感器的保存及使用提供了指導(dǎo)依據(jù)。3)針對(duì)改善銀-SPR傳感器的穩(wěn)定性、折射率響應(yīng)性能及自組裝效率的需求,采用氧化石墨烯對(duì)銀膜進(jìn)行了表面自組裝修飾,制作出基于氧化石墨烯的側(cè)邊拋磨光纖SPR折射率傳感器。文中對(duì)氧化石墨烯溶膠的配制、氧化石墨烯薄膜的形貌表征、氧化石墨烯膜層自組裝進(jìn)程的在線監(jiān)測(cè)進(jìn)行了實(shí)驗(yàn)研究,并測(cè)試了寡層氧化石墨烯修飾后側(cè)邊拋磨光纖SPR傳感器的折射率響應(yīng)特性�；谘趸┑膫�(cè)邊拋磨光纖SPR傳感器在穩(wěn)定性、靈敏度以及對(duì)生物分子的自組裝效率等方面有改善作用,為后續(xù)的生化檢測(cè)提供了性能穩(wěn)定、響應(yīng)快速、靈敏度高、負(fù)載率高的光纖SPR折射率傳感器基底。
[Abstract]:Surface plasmon resonance (SPR) sensing technology is a new and highly interdisciplinary detection technology in modern physics, chemistry, biomedicine, environmental science, etc. It has many advantages, such as no labeling, fast response, high sensitivity, high resolution, strong anti-electromagnetic interference ability and so on. So it is widely used in disease diagnosis, food safety, environmental monitoring, drug screening and so on. Optical fiber SPR sensor is light in size, low in cost, and can be used for remote on-line monitoring. It is easy to reuse and networking. It represents the future development direction of portable, networked and on-line remote monitoring of SPR sensor system, and has become the focus of attention of researchers all over the world in recent years. Silver-based SPR sensors have the advantages of simple structure, low cost, good uniformity of coating and high sensing performance. Compared with gold-based SPR sensors reported in more studies, silver-based SPR sensors have better performance and lower cost. However, silver is easily oxidized and vulcanized in the environment. The stability of the Ag-SPR sensor decreases and its application is limited by the degradation reaction. In this paper, the fabrication, optimization and response characteristics of the Ag-SPR fiber sensor are studied around the high-performance and low-cost Ag-Side Polished Fiber Optic SPR sensor. In order to improve the stability and refractive index response of the silver-SPR sensor, graphene oxide was used to modify the surface of the side-polished fiber SPR sensor by surface self-assembly method. A side polished fiber with good surface quality and precise controllable device parameters is fabricated by wheel-type mechanical fiber polishing method based on conventional single-mode fiber polishing technology. The fiber evanescent field substrate is provided for the further research and fabrication of SPR refractive index sensor. Based on the FFT analysis of the transmission spectrum and the characterization of the surface morphology, a Mach-Zehnder interferometric structure model is proposed to explain the interference phenomena of the roughly ground fiber. The temperature, axial stress, ethanol concentration and liquid refractive index of the roughly polished side-polished fiber with resonant peak contrast greater than 10 dB were measured. 2) Silver films with nanometer thickness were deposited on the side-polished fiber with good surface quality by vacuum hot-evaporation method. Optical fiber SPR sensor is edge polished, and the key parameters affecting the performance of the sensor, such as residual thickness, polishing length, power loss silver film thickness, are optimized experimentally. As an innovative point of this part, the degradation of the sensing performance of the silver-SPR sensor is studied. The degradation of the sensing performance of the silver-SPR sensor caused by the degradation of the silver film in air and liquid is analyzed. 3) In order to improve the stability, refractive index response and self-assembly efficiency of the silver-SPR sensor, graphene oxide was used to self-decorate the surface of the silver film, and a side-polished fiber SPR refractive index sensor based on graphene oxide was fabricated. The preparation of sol, morphology characterization of graphene oxide film and on-line monitoring of self-assembly process of graphene oxide film were studied. The refractive index response characteristics of side polished fiber SPR sensor modified with oligographene oxide were tested. The stability and sensitivity of side polished fiber SPR sensor based on graphene oxide were studied. It can also improve the self-assembly efficiency of biological molecules, and provide a stable, fast response, high sensitivity, high load rate optical fiber SPR refractive index sensor substrate for subsequent biochemical detection.
【學(xué)位授予單位】：深圳大學(xué)
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2016
【分類號(hào)】：TP212
[Abstract]:Surface plasmon resonance (SPR) sensing technology is a new and highly interdisciplinary detection technology in modern physics, chemistry, biomedicine, environmental science, etc. It has many advantages, such as no labeling, fast response, high sensitivity, high resolution, strong anti-electromagnetic interference ability and so on. So it is widely used in disease diagnosis, food safety, environmental monitoring, drug screening and so on. Optical fiber SPR sensor is light in size, low in cost, and can be used for remote on-line monitoring. It is easy to reuse and networking. It represents the future development direction of portable, networked and on-line remote monitoring of SPR sensor system, and has become the focus of attention of researchers all over the world in recent years. Silver-based SPR sensors have the advantages of simple structure, low cost, good uniformity of coating and high sensing performance. Compared with gold-based SPR sensors reported in more studies, silver-based SPR sensors have better performance and lower cost. However, silver is easily oxidized and vulcanized in the environment. The stability of the Ag-SPR sensor decreases and its application is limited by the degradation reaction. In this paper, the fabrication, optimization and response characteristics of the Ag-SPR fiber sensor are studied around the high-performance and low-cost Ag-Side Polished Fiber Optic SPR sensor. In order to improve the stability and refractive index response of the silver-SPR sensor, graphene oxide was used to modify the surface of the side-polished fiber SPR sensor by surface self-assembly method. A side polished fiber with good surface quality and precise controllable device parameters is fabricated by wheel-type mechanical fiber polishing method based on conventional single-mode fiber polishing technology. The fiber evanescent field substrate is provided for the further research and fabrication of SPR refractive index sensor. Based on the FFT analysis of the transmission spectrum and the characterization of the surface morphology, a Mach-Zehnder interferometric structure model is proposed to explain the interference phenomena of the roughly ground fiber. The temperature, axial stress, ethanol concentration and liquid refractive index of the roughly polished side-polished fiber with resonant peak contrast greater than 10 dB were measured. 2) Silver films with nanometer thickness were deposited on the side-polished fiber with good surface quality by vacuum hot-evaporation method. Optical fiber SPR sensor is edge polished, and the key parameters affecting the performance of the sensor, such as residual thickness, polishing length, power loss silver film thickness, are optimized experimentally. As an innovative point of this part, the degradation of the sensing performance of the silver-SPR sensor is studied. The degradation of the sensing performance of the silver-SPR sensor caused by the degradation of the silver film in air and liquid is analyzed. 3) In order to improve the stability, refractive index response and self-assembly efficiency of the silver-SPR sensor, graphene oxide was used to self-decorate the surface of the silver film, and a side-polished fiber SPR refractive index sensor based on graphene oxide was fabricated. The preparation of sol, morphology characterization of graphene oxide film and on-line monitoring of self-assembly process of graphene oxide film were studied. The refractive index response characteristics of side polished fiber SPR sensor modified with oligographene oxide were tested. The stability and sensitivity of side polished fiber SPR sensor based on graphene oxide were studied. It can also improve the self-assembly efficiency of biological molecules, and provide a stable, fast response, high sensitivity, high load rate optical fiber SPR refractive index sensor substrate for subsequent biochemical detection.
【學(xué)位授予單位】：深圳大學(xué)
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2016
【分類號(hào)】：TP212
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