Journal
NANOMATERIALS
Volume 11, Issue 10, Pages -Publisher
MDPI
DOI: 10.3390/nano11102604
Keywords
gas sensor; ammonia detection; hybrid; LIFT; laser; nanocomposite; SWCNT; SnO2
Categories
Funding
- Romanian Ministry of Education and Research, CNCS-UEFISCDI within PNCDI III [PN-III-P1-1.1-TE-2016-1417, PN-III-P2-2.1-PED-2019-1603]
- Romanian National Nucleus Program LAPLAS VI [16N/2019]
- Paul Scherrer Institute in Switzerland
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This study presents NH3 sensors fabricated using LIFT, composed of single-walled carbon nanotubes and tin oxide nanoparticles, which demonstrate excellent detection performance including fast response, low detection limit, and reversibility.
Ammonia is one of the most frequently produced chemicals in the world, and thus, reliable measurements of different NH3 concentrations are critical for a variety of industries, among which are the agricultural and healthcare sectors. The currently available technologies for the detection of NH3 provide accurate identification; however, they are limited by size, portability, and fabrication cost. Therefore, in this work, we report the laser-induced forward transfer (LIFT) of single-walled carbon nanotubes (SWCNTs) decorated with tin oxide nanoparticles (SnO2 NPs), which act as sensitive materials in chemiresistive NH3 sensors. We demonstrate that the LIFT-fabricated sensors can detect NH3 at room temperature and have a response time of 13 s (for 25 ppm NH3). In addition, the laser-fabricated sensors are fully reversible when exposed to multiple cycles of NH3 and have an excellent theoretical limit of detection of 24 ppt.
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