Next Article in Journal
Fabrication of [email protected]2 Nanocomposite Heterojunction Arrays and Their Photoelectric Properties
Previous Article in Journal
Light Gradient-Based Screening of Arabidopsis thaliana on a 384-Well Type Plant Array Chip
Open AccessArticle

Fabrication of SnO2 Composite Nanofiber-Based Gas Sensor using the Electrospinning Method for Tetrahydrocannabinol (THC) Detection

School of Engineering, University of British Columbia, Kelowna, BC V1V 1V7, Canada
*
Author to whom correspondence should be addressed.
Micromachines 2020, 11(2), 190; https://doi.org/10.3390/mi11020190
Received: 6 December 2019 / Revised: 10 February 2020 / Accepted: 11 February 2020 / Published: 12 February 2020
(This article belongs to the Special Issue Nanomaterial and Nanostructure-Enabled On-Chip Sensing)
This paper presents the development of a metal oxide semiconductor (MOS) sensor for the detection of volatile organic compounds (VOCs) which are of great importance in many applications involving either control of hazardous chemicals or noninvasive diagnosis. In this study, the sensor is fabricated based on tin dioxide (SnO2) and poly(ethylene oxide) (PEO) using electrospinning. The sensitivity of the proposed sensor is further improved by calcination and gold doping. The gold doping of composite nanofibers is achieved using sputtering, and the calcination is performed using a high-temperature oven. The performance of the sensor with different doping thicknesses and different calcination temperatures is investigated to identify the optimum fabrication parameters resulting in high sensitivity. The optimum calcination temperature and duration are found to be 350 °C and 4 h, respectively and the optimum thickness of the gold dopant is found to be 10 nm. The sensor with the optimum fabrication process is then embedded in a microchannel coated with several metallic and polymeric layers. The performance of the sensor is compared with that of a commercial sensor. The comparison is performed for methanol and a mixture of methanol and tetrahydrocannabinol (THC) which is the primary psychoactive constituent of cannabis. It is shown that the proposed sensor outperforms the commercial sensor when it is embedded inside the channel.
Keywords: gas sensor; electrospinning; SnO2 nanofibers; gold functionalization gas sensor; electrospinning; SnO2 nanofibers; gold functionalization
MDPI and ACS Style

Mehrabi, P.; Hui, J.; Janfaza, S.; O’Brien, A.; Tasnim, N.; Najjaran, H.; Hoorfar, M. Fabrication of SnO2 Composite Nanofiber-Based Gas Sensor using the Electrospinning Method for Tetrahydrocannabinol (THC) Detection. Micromachines 2020, 11, 190.

Show more citation formats Show less citations formats
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Back to TopTop