本可攜式二氧化氮氣體感測系統之氣體感測元件為利用一鍋多元醇法結合有機金屬裂解法(Metal-organic decomposition, MOD)製備氧化鐵/多壁奈米碳管/三氧化鎢(Fe2O3/MWCNTs/WO3)複合材料所製作，同時搭配週期性紫外光脈衝式二氧化氮氣體感測系統，用於檢測摩托車廢氣。可攜式氣體感測系統包含中央管理器，連接及控制液晶顯示系統、數據讀取系統以及紫外光脈衝感測模組。利用X-射線繞射分析(XRD)、掃描式電子顯微鏡(SEM) 、能量色散X射線光譜儀(EDS)分析薄膜的結構及型態。研究不同波長的照射及照射時間對可攜式氣體感測系統檢測二氧化氮感測特性的影響。此可攜式氣體感測系統在週期性紫外光脈衝的運作模式下具有高靈敏度，良好的線性，低偵測極限和對二氧化氮氣體感測的高選擇性。
A portable NO2 gas sensing system in periodically UV-light pulsed operation mode was fabricated for application in sensing exhaust gas from a motorcycle. The portable gas-sensing system included a device manager. The device manager was coupled to a pulsed sensing module, a liquid-crystal display module and a data capture module. The sensor was made of iron oxide/multi-walled carbon nanotubes/tungsten oxide (Fe2O3/MWCNTs/WO3) composite material by the one-pot polyol method followed by metal organic decomposition (MOD) method. Scanning electron microscopy (SEM), energy dispersive spectrometry (EDS) and X-ray diffractometry (XRD) were used to analyze the structure and morphology of the fabricated films. The effects of the various wavelength of the irradiation and the time of irradiation on the response of the portable gas-sensing system for sensing NO2 gas were studied. This portable gas-sensing system in periodically UV-light pulsed operation mode exhibited high sensitivity, good linearity, a low detection limit and high selectivity for the sensing of NO2 gas.
