Room‐Temperature Hydrogen Sensor with High Sensitivity and Selectivity using Chemically Immobilized Monolayer Single‐Walled Carbon Nanotubes

Although semiconducting single‐walled carbon nanotubes (sc‐SWNTs) exhibit excellent sensing properties for various gases, commercialization is hampered by several obstacles. Among these, the difficulty in reproducibly fabricating sc‐SWNT films with uniform density and thickness is the main one. Here...

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Published in:Advanced functional materials 2023-05, Vol.33 (18), p.n/a
Main Authors: Girma, Henok Getachew, Park, Kwang Hun, Ji, Dongseob, Kim, Yejin, Lee, Hye Min, Jeon, Seungju, Jung, Seo‐Hyun, Kim, Jin Young, Noh, Yong‐Young, Lim, Bogyu
Format: Article
Language:English
Subjects:
Alkynes
Chemical reactions
Chemical sensors
click reactions
Commercialization
Density
highly sensitive sensors
Hydrogen
Materials science
Monolayers
Nanoparticles
Polymers
Reproducibility
reproducible film density
Room temperature
room temperature hydrogen sensors
selective polymer layers
Selectivity
semiconducting carbon nanotubes
Sensitivity
Sensors
Single wall carbon nanotubes
Substrates
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Summary:Although semiconducting single‐walled carbon nanotubes (sc‐SWNTs) exhibit excellent sensing properties for various gases, commercialization is hampered by several obstacles. Among these, the difficulty in reproducibly fabricating sc‐SWNT films with uniform density and thickness is the main one. Here, a facile fabrication method for sc‐SWNT‐based hydrogen (H2) sensors with excellent reproducibility, high sensitivity, and selectivity against CO, CO2, and CH4 is reported. Uniform‐density and monolayer sc‐SWNT films are fabricated using chemical immobilized through the click reaction between azide‐functionalized polymer‐wrapped sc‐SWNTs and immobilized alkyne polymer on a substrate before decorating with Pd nanoparticles (0.5–3.0 nm). The optimized sc‐SWNT sensor has a high room‐temperature response of 285 with the response and recovery times of 10 and 3 s, respectively, under 1% H2 gas in air. In particular, this sensor demonstrates highly selective H2 detection at room temperature (25 °C), compared to other gases and humidity. Therefore, the chemical immobilization of the monolayer SWNT films with reproducible and uniform density has the potential for large‐scale fabrication of robust room‐temperature H2 sensors. Reproducible, highly sensitive, and selective polymer–noble metal–semiconductor single‐walled carbon nanotube (sc‐SWNT)‐based room‐temperature H2 sensors are successfully fabricated by chemically anchoring high‐purity sc‐SWNTs on an alkyne‐based adhesion layer‐treated substrate through a click reaction.
ISSN:1616-301X
1616-3028
DOI:10.1002/adfm.202213381