Conductivity inversion of methyl viologen-modified random networks of single-walled carbon nanotubes

Przewłoka, Aleksandra; Rehman, Adil; Smirnov, Serguei; Karpierz-Marczewska, Ewelina; Krajewska, Aleksandra; Liszewska, Malwina; Dróżdż, Piotr A.; Pavłov, Krystian; Dub, Maksym; Novytskyi, Serhi; Jankiewicz, Bartłomiej J.; Mierczyk, Zygmunt; Rumyantsev, Sergey; Lioubtchenko, Dmitri

doi:10.1016/j.carbon.2022.10.071

Cited by 2 publications

(1 citation statement)

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“…As seen, the resistance increases for all investigated samples upon UV illumination (i.e., negative photoconductivity), owing to the desorption of gas molecules attached to the surface of CNTs. A more detailed description of the UV light effect of CNT-based device resistance can be found in refs ( 16 ), ( 32 ), and ( 33 ). Interestingly, the sample with a less-dense network of CNTs (in this case, 90% transparency) exhibits a higher response to incoming UV irradiation than the sample with a higher network density (i.e., 60% transparency).…”

Section: Resultsmentioning

confidence: 99%

Optimum Choice of Randomly Oriented Carbon Nanotube Networks for UV-Assisted Gas Sensing Applications

Drozdowska,

Rehman,

Smulko

et al. 2023

ACS Sens.

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We investigated the noise and photoresponse characteristics of various optical transparencies of nanotube networks to identify an optimal randomly oriented network of carbon nanotube (CNT)-based devices for UV-assisted gas sensing applications. Our investigation reveals that all of the studied devices demonstrate negative photoconductivity upon exposure to UV light. Our studies confirm the effect of UV irradiation on the electrical properties of CNT networks and the increased photoresponse with decreasing UV light wavelength. We also extend our analysis to explore the low-frequency noise properties of different nanotube network transparencies. Our findings indicate that devices with higher nanotube network transparencies exhibit lower noise levels. We conduct additional measurements of noise and resistance in an ethanol and acetone gas environment, demonstrating the high sensitivity of higher-transparent (lower-density) nanotube networks. Overall, our results indicate that lower-density nanotube networks hold significant promise as a viable choice for UV-assisted gas sensing applications.

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Section: Resultsmentioning

confidence: 99%