近年來許多研究報導指出，懸浮於環境中的微粒被人體吸入後可能對人體健康造成負面的影響，因此人們對於環境中懸浮微粒的質量濃度格外重視。本研究欲探討利用石英晶體微天平對於量測微量物質質量的精準度與靈敏度的優勢，評估運用於連續量測細懸浮微粒質量濃度之可行性，期望藉此幫助國人監測及評估環境中的空氣品質。本研究先透過選用合適的微粒類別及設計引流的方式，使空氣中的細懸浮微粒附著於壓電晶體的表面上；再透過控制環境濕度及氣流流速的方式，減少實驗過程中的干擾；最後，藉由不同的抽氣流量、引流口的角度及微粒之質量濃度等方式觀察微粒沉積於晶體過程中頻率的變化，藉此探討運用之可行性。
研究結果顯示石英晶體微天平有由低頻率往高頻率零點飄移的現象；並於抽氣流量0.5 LPM時，對頻率的變化影響比較小；且透過水平引流口的設計方式可使微粒無法經由重力沉降的方式持續進入引流道內；又其頻率的變化量與環境中細懸浮微粒質量濃度成正相關且具有1.8~3.6 μg/M3的量測能力。因此證實石英晶體微天平確實可做為量測空氣中細懸浮微粒質量濃度的量測元件；只要再經詳加地探討運用的操作限制後，即具有發展成為連續即時量測元件之潛力。

In recent years, a growing body of researches has reported that particulate matter could adversely affect human health; therefore people have paid more attention on the concentration of particulate matter in the environment. Of its accurate and sensible measurement of particulate matter, this study sheds light on the feasibility of using quartz crystal microbalance (hereafter QCM) to continuously detect the concentration of particulate matter. The application of QCM is expected to help monitor and evaluate the air quality.
In the beginning we attach the particulate matter to the surface of crystal by selecting the appropriate particle type and designing the method of drainage, and control environmental humidity and air flow rate to reduce the interference in the experimental process. We can therefore observe the change of the frequency of the particles depositing in crystal by differentiating the pumping flow rate, the angle of the drainage port and the mass concentration of the particles to explore the feasibility of the application.
The results show that the QCM exhibits zero drift from low to high frequency. When the pumping flow rate is 0.5 LPM, the influence is insignificant. The design of the drainage port can deter particles from continuing entry to the drainage channel by gravity. Also, the change of frequency is positively correlated with the concentration of particulate matter and the sensibility is 1.8~3.6 μg/M3.
Our results suggest that the QCM can be used as a sensing component to measure particulate matter, and potentially it could be developed into a continuously and real-time monitoring components after careful discussion of the constraints.

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