摘要
本研究將中空光纖感測器串聯於氣相層析儀作為新型態有機揮發性氣體(Volatile Organic Compounds；VOCs)感測器。其原理乃利用奈米金屬粒子吸附有機氣體分子會造成局部性表面電漿共振(Localized Surface Plasmon Resonance；LSPR)光譜改變。本實驗所製備的奈米金粒子是利用檸檬酸鈉將四氯金酸(HAuCl4)還原成金原子，藉由自組裝薄膜反應機制將奈米金粒子修飾於中空光纖內層表面，其修飾劑為含有胺基(－NH2)的APTMS。將此感測器串聯於氣相層析儀，藉由綠光二極體(LED)提供一固定光源，穿過中空光纖管壁至另一端由綠光感測器所接收，當有機氣體流經層析管柱分離後，會被中空光纖表面的奈米金粒子所吸附而導致光強度有所變化，並利用雙低通濾波來提升綠光感測器之訊雜比及補償訊號飄移問題。此感測器成功地測試了十種混合有機氣體，結果顯示訊號反應迅速且具有良好的穩定性以及線性關係(R2≧0.99)，其偵測下限範圍可達60 ~ 185 ng，此偵測下限值比以往文獻中利用表面電漿共振原理來感測氣體還低。在未來的發展可將此奈米金中空光纖式表面電漿共振感測器應用於微小化氣相層析儀。
並列摘要
This research reports a novel optical hollow fiber device as a gas chromatographic detector for volatile organic compounds (VOCs). The detection is based on molecular adsorbed on the nanoparticle surface causing shifts in the localized surface plasmon resonance (LSPR) spectral peak. In this work, the sensing materials using gold nanoparticles were prepared via sodium citrate reduction of hydrogen tetrachlororaurate (HAuCl4). The gold nanoparticles were coated on the inner surface of optical hollow fiber by the self-assembled reaction between gold nanoparticles and surface amino groups (APTMS). The detection system was constructed on a bench-scale GC equipped with a separation column that was connected to the device, the light emitting diode (LED) as an light source and the light was passed through the wall of optical hollow fiber, when VOCs from GC column elutes through the optical hollow fiber, the gas molecules were adsorbed on gold nanoparticles caused changing the intensity of the light power transmitted. A green sensor was used to measure the intensity changes of light. A dual low-pass filter circuit was used to enhance signal/noise ratio for the green sensor and automatically compensated the baseline drift. The chromatogram of ten organic vapors plus water peak in background was successfully detected by our new detector. The result indicates that the detector peaks are sharp and responses are rapid, reversible, reproducible and linear (R2≧0.99) for all tested compounds. The limits of detection are ranging from 60 to 185 ng. All detection limit values were lower than that of previously reported gas sensing with LSPR system. This detector presented in this study shows good detection ability and has the potential for future integration with micro-GC system.
參考文獻
21. 楊吉斯, 漸逝波型紅外光光學化學感測器, 中原大學化學系, Chemistry , 2001, 第五十九卷, 第二期, 59, 245-251
2. 鍾沛文, 高分子弦振動式氣相層析感測器之原理開發, 國立臺灣師範大學化學系研究所碩士論文, 2011
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延伸閱讀
- 黃鴻基（2007）。奈米金棒波導之表面電漿震盪耦合與訊號傳遞〔博士論文，國立臺灣大學〕。華藝線上圖書館。https://doi.org/10.6342/NTU.2007.03184
- 洪毓聆（2010）。奈米金與近紅外雷射選擇性表面電漿共振之理論與實驗〔碩士論文，國立臺灣大學〕。華藝線上圖書館。https://doi.org/10.6342/NTU.2010.00085
- Lin, S. C. (2013). 調控奈米間隙界面與模擬超穎材料表面電漿子共振於增強拉曼散射光譜之應用 [master's thesis, National Taiwan University]. Airiti Library. https://doi.org/10.6342/NTU.2013.10512
- Lo, Y. L. (2004). 奈米粒子為基礎之光增強表面電漿共振感測器 [master's thesis, National Taiwan University]. Airiti Library. https://doi.org/10.6342/NTU.2004.00520
- 黎育蕙（2017）。奈米複合材料局部表面電漿共振光纖毛細管偵測器的發展與應用〔碩士論文，國立臺灣師範大學〕。華藝線上圖書館。https://doi.org/10.6345/NTNU202202650