Theoretical Approach to Evaluate the Gas-Sensing Performance of Graphene Nanoribbon/Oligothiophene Composites

Ashraf, Ayesha; Herbert, John M.; Muhammad, Shabbir; Farooqi, Bilal Ahmad; Farooq, Umar; Salman, Muhammad; Ayub, Khurshid

doi:10.1021/acsomega.1c05863

Title: Theoretical Approach to Evaluate the Gas-Sensing Performance of Graphene Nanoribbon/Oligothiophene Composites

Journal Article · 04 January 2022 · ACS Omega

DOI: https://doi.org/10.1021/acsomega.1c05863 · OSTI ID:1838215

Ashraf, Ayesha ^[1];

^[2];

^[3]; Farooqi, Bilal Ahmad ^[4]; Farooq, Umar ^[4]; Salman, Muhammad ^[4];

^[5]

The Ohio State Univ., Columbus, OH (United States); Univ. of the Punjab, Lahore (Pakistan)
The Ohio State Univ., Columbus, OH (United States)
King Khalid Univ., Abha (Saudi Arabia)
Univ. of the Punjab, Lahore (Pakistan)
COMSATS Univ. Islamabad, Abbottabad (Pakistan)

Composite formation with graphene is an effective approach to increase the sensitivity of polythiophene (nPT) gas sensors. The interaction mechanism between gaseous analytes and graphene/nPT composite systems is still not clear, and density functional theory calculations are used to explore the interaction mechanism between graphene/nPT nanoribbon composites (with n = 3–9 thiophene units) and gaseous analytes CO, NH₃, SO₂, and NO₂. For the studied analytes, the interaction energy ranges from –44.28 kcal/mol for (C₅₄H₃₀- 3PT)-NO₂ to –2.37 kcal/mol for (C₅₄H₃₀-3PT)-CO at the counterpoise-corrected ωB97M-V/def2-TZVPD level of theory. The sensing mechanism is further evaluated by geometric analysis, ultraviolet–visible spectroscopy, density of-states analysis, calculation of global reactivity indices, and both frontier and natural bond orbital analyses. The variation in the highest occupied molecular orbital/lowest unoccupied molecular orbital gap of the composite indicates the change in conductivity upon complexation with the analyte. Energy decomposition analysis reveals that dispersion and charge transfer make the largest contributions to the interaction energy. The graphene/oligothiophene composite is more sensitive toward these analytes than either component taken alone due to larger changes in the orbital gap. The computational framework established in the present work can be used to evaluate and design graphene/nPT nanoribbon composite materials for gas sensors.

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Research Organization:: COMSATS Univ. Islamabad, Abbottabad (Pakistan); The Ohio State Univ., Columbus, OH (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division; USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0008550; SC0008850

OSTI ID:: 1838215

Alternate ID(s):: OSTI ID: 1841090; OSTI ID: 1903470

Journal Information:: ACS Omega, Vol. 7, Issue 2; ISSN 2470-1343

Publisher:: American Chemical Society (ACS)Copyright Statement

Country of Publication:: United States

Language:: English

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