Development of SPR-based chip for Room-temperature Nitric Oxide Gas Sensing
Date Issued
2009
Date
2009
Author(s)
Wu, Tsing-Hua
Abstract
A study was conducted to use the cyclic voltammery (CV) method to deposit polymer on the SPR chips at different potential range, scanning cycles, and scanning rates. We proposed to design SPR sensing chip combined with the Poly(3,4-ethylenedioxythiophene) (PEDOT) thin film as a novel optical SPR gas sensor. Depending on the optimal design of PEDOT sensing film, it provided better SPR curve and sensitivity and be able to apply to application of nitric oxide (NO) detector, which is a critical index in asthma diagnostic, and environmental toxic gas sensor in the future.n this study, we used the electrochemical system to prepare the PEDOT thin film. PEDOT as a sensing film which working at room temperature, as compared to the need to operate at a high temperature metal or metal compound semiconductor, and it have advantage of high conductivity, low-cost and easy to manufacture, etc... In the experiment the chip we use with sweeping voltage from 0v to 0.88v, scan rate 200mV/s for 30 cycles. At the degree of 43.2?, the reflectance intensity are 0.707, 0.407, and 0.232 at different concentration of 100, 50, 25ppm NO gas and 0.55, 0.32, and 0.17 for NO2 gas, the detecting limit of this thin-film sensing chip is about 8 ppm of NO gas at room temperature, correlation coefficient, R2, of NO gas concentration versus SPR angle shift is 0.96; the result shows the intensity for NO gas sensing is larger than NO2 gas and faster reaction time. In the experiments of this thesis, we have successfully combined the PEDOT thin film with the SPR sensor to serve as a nitric oxide gas detector, this novel type gas sensor provides several advantages such as fast, reversible, room temperature and high sensitivity and is able to serve as an optical surface plasmon resonance gas sensor.
Subjects
Gas sensor
Nitric oxide
Poly(3,4-ethylenedioxythiophene) (PEDOT)
Surface plasmon resonance
Type
thesis
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