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URN etd-0815111-203908 Statistics This thesis had been viewed 2481 times. Download 1649 times. Author Chin-Wei Hsu Author's Email Address No Public. Department Electro-Optical Engineering Year 2010 Semester 2 Degree Master Type of Document Master's Thesis Language zh-TW.Big5 Chinese Page Count 94 Title THE STUDY OF USING GOLD NANOPARTICLES TO IMPROVE THE SENSITIVITY OF SPR FIBER SENSORS Keyword SPR gold nanoparticles melamine melamine gold nanoparticles SPR Abstract 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.
Advisor Committee Woo-Hu Tsai - advisor
H. H. Yee - co-chair
Wen-Ching Shih - co-chair
Files Date of Defense 2011-07-26 Date of Submission 2011-08-17