低功耗有機二氧化碳感測器

Abstract

為了解決現有的二氧化碳感測器所面對的問題，包含金屬氧化物的高功耗問題、以及高分子材料的複雜製程和濕度敏感問題，我們使用聚苯胺（Emeraldine base –polyaniline）以及聚二氧乙基噻吩聚苯乙烯磺酸（poly(3,4-ethylenedioxythiophene) polystyrene sulfonate）混和而成的材料製作可室溫操作的二氧化碳感測器元件。此元件可以在二氧化碳濃度為1000-20000ppm之間有著線性的電阻變化，變化量約在0.98%~3.83%之間。這樣的感測範圍適合用在一般室內的空氣品質檢測，以警示二氧化碳濃度過高的狀況。除此之外，此元件在相對濕度為50~85%之間時，對濕度有著相當低的敏感度，使得在一般檢測環境下不會受到濕度變化的影響，在室內空氣品質檢測的應用上，是相當大的優勢。

To resolve the high power consumption and complex polymerization process of most CO2 sensors, a room temperature operation CO2 sensor based on Emeraldine base –polyaniline (EB-PANI) blended with poly(3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS) was developed. In this work, the sensor performed linear response to CO2 in working range of 1000-20000 ppm with the response from 0.98% to 3.83%. This detection range is low enough for environmental detection. On the other hand, compared to the response to CO2, this sensor has extremely lower response to humidity from 50 % to 85 % RH. Hence, in ambient environment, this CO2 sensor can ignore humidity effect to detect CO2 concentration.