Title :
Multi-Walled Carbon Nanotube-Based Gas Sensor for NH3 Detection at Room Temperature
Author :
Guo Miao ; Wu Kai-hua ; Xu Ying ; Wang Ren-Hui ; Pan Min
Author_Institution :
Inst. of Biomed. Eng. & Instrum., Hangzhou Dianzi Univ., Hangzhou, China
Abstract :
Gas sensors based on Multi-walled carbon nanotubes (MWNTs) for Ammonia (NH3) detection at room temperature were studied. MWNT were prepared by chemical vapor deposition method, and coated on Au electrodes, which were sputtered on anodised aluminium substrate and then immersed in thiol solution for 24h. It is found that the MWNT based sensors have a reversible sensing capacity to NH3 gas with response time and recovery time were less than 1min, respectively. At room temperature of 25°C, resistance changes of the sensor were logarithmic dependent on NH3 gas concentrations. It is suggested that MWNTs could be a promising sensing material for NH3 detection at room temperature.
Keywords :
ammonia; carbon nanotubes; chemical vapour deposition; gas sensors; MWNT based sensors; aluminium substrate; ammonia detection; gas concentrations; gas sensor; multiwalled carbon nanotube; reversible sensing capacity; temperature 25 degC; Aluminum; Capacitive sensors; Carbon nanotubes; Chemical sensors; Chemical vapor deposition; Delay; Electrodes; Gas detectors; Gold; Temperature sensors;
Conference_Titel :
Bioinformatics and Biomedical Engineering (iCBBE), 2010 4th International Conference on
Conference_Location :
Chengdu
Print_ISBN :
978-1-4244-4712-1
Electronic_ISBN :
2151-7614
DOI :
10.1109/ICBBE.2010.5516726