利用金奈米粒子改善SPR光纖感測器靈敏度之研究

THE STUDY OF USING GOLD NANOPARTICLES TO IMPROVE THE SENSITIVITY OF SPR FIBER SENSORS

許沁威(Chin-Wei Hsu)

指導教授 ： 蔡五湖

大同大學/電機資訊學院/光電工程研究所/碩士(2011年)

摘要

表面電漿共振（Surface Plasmon Resonance SPR）光纖感測器目前廣泛的應用於生物及化學感測上，而且表面電漿共振光纖感測器擁有可再生性、動態變化的即時量測能力等優點。而且光纖本身體積小、重量輕和可彎曲性，所製作出的表面電漿共振光纖感測器具微小的感測區，適合應用於小體積樣本的檢測，其應用和檢測的範圍越來越
廣。
在本論文中，利用相同形狀及相同大小的金奈米粒子沉積在表面電漿共振光纖感測器的金膜上，藉此提升表面電漿共振光纖感測器的靈敏度，並且量測低濃度的三聚氰胺溶液。與金膜SPR 光纖感測器比較，可將原本在600～700 nm 的感測區段位移至750～800 nm 波長範圍，而此範圍已經非常靠近光纖低損耗820～850 nm。當純金膜量測低濃度三聚氰胺溶液時，其SPR 訊號波長位移量和SPR 下降響應曲線中心位置變化量分別為2～7 nm 和0.5～0.7 ％。在金膜沉積了金奈米粒子後，當量測低濃度三聚氰胺溶液時，其SPR 訊號波長位移量和SPR 下降響應曲線中心位置變化量分別為10～20 nm 和1～1.5 ％。由此實驗數據我們可以知道，在金膜上沉積金奈米粒子確實可以提升表面電漿共振光纖感測器的感測靈敏度。

關鍵字

金奈米粒子 ； 表面電漿共振 ； 三聚氰胺

並列摘要

Surface Plasmon Resonance（SPR）fiber sensors have been widely used in biological and chemical sensing. The SPR fiber sensors are reproducible and have the capability of real-time dynamic measurement. Since optical fiber has the advantages of small size, low weight, and flexible capacity, which enable the SPR fiber sensors, with small sensing area, to sense small-volume samples to extensive sensing range and provide various applications.
In this paper, we use gold nanoparticles deposited on the gold film surface, with same shape and the same size, to improve the sensitivity of SPR fiber sensors. The SPR fiber sensors we proposed have been applied to measure the melamine solution with low concentration. Compared to the data of ordinary SPR fiber sensor with gold film only, the SPR sensing wavelength shifts from the region of 600～700 nm to the region of 750～800 nm. This longer wavelength region is very close to the low-loss window of 820～850 nm for the fiber. Besides, the wavelength shift of the SPR dip is from 2～7 nm for the ordinary gold film only compared to 10～20 nm for those sensors with extra gold nanoparticles deposition while the normalized intensity of the SPR dip is 0.5～0.7 ％ for the ordinary gold film compared to 1～1.5 ％ for those sensors with
extra gold nanoparticles deposition also based on the above evidences. It is clear that the sensitivity of the SPR fiber sensor can be improved significantly by using gold nanoparticles deposited on the gold film surface.

並列關鍵字

melamine ； gold nanoparticles ； SPR

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