Film bulk acoustic formaldehyde sensor with polyethyleneimine-modified single-wall carbon nanotubes as sensitive layer

SENSORS AND ACTUATORS B-CHEMICAL

卷:266

Article

Song, Shuren¹  Chen, Da^1,2,3  Wang, Hongfei¹  Guo, Qiuquan⁴  Wang, Wei¹  Wu, Maozeng¹  Yu, Wenhua¹ 

[1] Shandong Univ Sci & Technol, Coll Elect Commun & Phys, Qingdao 266590, Peoples R China

[2] Shandong Univ Sci & Technol, State Key Lab Min Disaster Prevent & Control Cofo, Qingdao 266590, Peoples R China

[3] Shandong Univ Sci & Technol, Minist Sci & Technol, Qingdao 266590, Peoples R China

[4] Western Univ, Mech & Mat Engn, London, ON N6A 3K7, Canada

关键词: Formaldehyde;    Single-wall carbon nanotubes;    Gas sensor;    Film bulk acoustic resonator;   

DOI  :  10.1016/j.snb.2018.03.129

来源: Elsevier

【 摘 要 】

Polyethyleneimine-modified single-wall carbon nanotubes were self-assembled as a sensitive coating for the micro-scale film bulk acoustic formaldehyde sensor. The film bulk acoustic resonator has a high working frequency (similar to 4.5 GHz) and can detect the ultra-small mass changes in the sensitive layer induced by the absorption of formaldehyde molecules. The proposed sensor demonstrated a reversible and linear response towards formaldehyde over the range of 50-400 ppb, with a limit of detection of 24 ppb. Both the response and recovery times were less than 1 min. The frequency response was improved with increasing coverage of carbon nanotubes on the resonator surface due to the larger surface area and adsorption space. The polyethyleneimine-modified single-wall carbon nanotubes provided an excellent selectivity towards formaldehyde over interfering organic vapors. The results show that the film bulk acoustic sensor is a promising candidate for the portable and convenient detection of indoor air pollution with high sensitivity. (C) 2018 Published by Elsevier B.V.

【 授权许可】

Free