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Ammonia is one of the most frequently produced chemicals in the world, and thus, reliable measurements of different NH 3 concentrations are critical for a variety of industries, among which are the agricultural and healthcare sectors. The currently available technologies for the detection of NH 3 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 (SnO 2 NPs), which act as sensitive materials in chemiresistive NH 3 sensors. We demonstrate that the LIFT-fabricated sensors can detect NH 3 at room temperature and have a response time of 13 s (for 25 ppm NH 3 ). In addition, the laser-fabricated sensors are fully reversible when exposed to multiple cycles of NH 3 and have an excellent theoretical limit of detection of 24 ppt.

Facile Fabrication of Hybrid Carbon Nanotube Sensors by Laser Direct Transfer