Sensitive and Selective Ammonia Gas Sensor Based on Molecularly Modified SnO2

Proceedings

Hijazi, Mohamad¹ 

关键词: SnO2;    molecular modification;    APTES;    gas sensor;    sensitivity;    selectivity;    ammonia;    ambient temperature;   

DOI  :  10.3390/proceedings1040399

学科分类：社会科学、人文和艺术（综合）

来源: mdpi

【 摘 要 】

The development of selective and cheap metal oxide gas sensor at ambient temperature is still a challenging idea. In this study, SnO2 surface functionalization was performed in order to obtain sensitive and selective gas sensor operated at ambient temperature. 3-aminopropyltriethoxysilane (APTES) was used as an intermediate step, followed by functionalization with molecules having acyl chloride with different end functional groups molecules such as alkyl, acid and ester groups. Acid and ester modified sensors are sensitive to ammonia between 0.2 and 10 ppm at room temperature. However, ester modified SnO2 is more selective than acid modified sensor regarding ethanol and carbon monoxide gases.

【 授权许可】

CC BY