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Title: Probing the role of CNTs in Pt nanoparticle/CNT/graphene nanohybrids H 2 sensors

Journal Article · · Nano Express

Abstract In the carbon nanotubes film/graphene heterostructure decorated with catalytic Pt nanoparticles using atomic layer deposition (Pt-NPs/CNTs/Gr) H 2 sensors, the CNT film determines the effective sensing area and the signal transport to Gr channel. The former requires a large CNT aspect ratio for a higher sensing area while the latter demands high electric conductivity for efficient charge transport. Considering the CNT’s aspect ratio decreases, while its conductivity increases ( i.e. , bandgap decreases), with the CNT diameter, it is important to understand how quantitatively these effects impact the performance of the Pt-NPs/CNTs/Gr nanohybrids sensors. Motivated by this, this work presents a systematic study of the Pt-NPs/CNTs/Gr H 2 sensor performance with the CNT films made from different constituent CNTs of diameters ranging from 1 nm for single-wall CNTs, to 2 nm for double-wall CNTs, and to 10–30 nm for multi-wall CNTs (MWCNTs). By measuring the morphology and electric conductivity of SWCNT, DWCNT and MWCNT films, this work aims to reveal the quantitative correlation between the sensor performance and relevant CNT properties. Interestingly, the best performance is obtained on Pt-NPs/MWCNTs/Gr H 2 sensors, which can be attributed to the compromise of the effective sensing area and electric conductivity on MWCNT films and illustrates the importance of optimizing sensor design.

Research Organization:
Kansas City National Security Campus (KCNSC), Kansas City, MO (United States); Univ. of Kansas, Lawrence, KS (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA); National Science Foundation (NSF)
Grant/Contract Number:
NA-0002839; NSF-DMR-1909292; NA0002839; DMR-1909292; ECCS-1809293; NSF-ECCS-1809293
OSTI ID:
1882441
Alternate ID(s):
OSTI ID: 1733312; OSTI ID: 1877944
Journal Information:
Nano Express, Journal Name: Nano Express Vol. 3 Journal Issue: 3; ISSN 2632-959X
Publisher:
IOP PublishingCopyright Statement
Country of Publication:
United Kingdom
Language:
English

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