Edge-Functionalized Graphene Nanoribbon Chemical Sensor: Comparison with Carbon Nanotube and Graphene

Kyeong Min Cho, Soo Yeon Cho, Sanggyu Chong, Hyeong Jun Koh, Daewoo Kim, Jihan Kim, Hee Tae Jung

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

With growing focus on the use of carbon nanomaterials in chemical sensors, one-dimensional graphene nanoribbon (GNR) has become one of the most attractive channel materials, owing to its enhanced conductance fluctuation by quantum confinement effects and dense, abundant edge sites. Due to the narrow width of a basal plane with one-dimensional morphology, chemical modification of edge sites would greatly affect the electrical channel properties of a GNR. Here, we demonstrate for the first time that chemically functionalizing the edge sites with aminopropylsilane (APS) molecules can significantly enhance the sensing performance of the GNR sensor. The resulting APS-functionalized GNR has a sensitivity ((Î"R/R b ) max ) of â30% at 0.125 ppm nitrogen dioxide (NO 2 ) and an ultrafast response time (â6 s), which are, respectively, 7- and 15-fold enhancements compared to a pristine GNR sensor. This is the fastest and most sensitive gas-sensing performance of all GNR sensors reported. To demonstrate the superiority of the GNR-APS sensor, we compare its sensing performance with that of APS-functionalized carbon nanotube (CNT) and reduced graphene oxide (rGO) sensors prepared in identical synthesis conditions. Very interestingly, the GNR-APS sensor exhibited 30- and 93-fold enhanced sensitivity compared to the CNT-APS and rGO-APS sensors. This might be attributed to highly active edge sites with superior chemical reactivity, which are not present in CNT and rGO materials. Density functional theory clearly shows that the greatly enhanced gas response of GNR with edge functionalization can be attributed to the higher electron densities in the highest occupied molecular orbital levels of GNR-APS and incorporation of additional adsorption sites. This finding is the first demonstration of the importance of edge functionalization of GNR for chemical sensors.

Original languageEnglish
Pages (from-to)42905-42914
Number of pages10
JournalACS Applied Materials and Interfaces
Volume10
Issue number49
DOIs
Publication statusPublished - 2018 Dec 12

Fingerprint

Nanoribbons
Carbon Nanotubes
Graphite
Chemical sensors
Graphene
Carbon nanotubes
Sensors
Oxides
Gases
Nitrogen Dioxide
Chemical reactivity
Quantum confinement
aminopropylsilane
Chemical modification
Molecular orbitals
Nanostructured materials
Density functional theory
Carrier concentration

All Science Journal Classification (ASJC) codes

  • Materials Science(all)

Cite this

Cho, Kyeong Min ; Cho, Soo Yeon ; Chong, Sanggyu ; Koh, Hyeong Jun ; Kim, Daewoo ; Kim, Jihan ; Jung, Hee Tae. / Edge-Functionalized Graphene Nanoribbon Chemical Sensor : Comparison with Carbon Nanotube and Graphene. In: ACS Applied Materials and Interfaces. 2018 ; Vol. 10, No. 49. pp. 42905-42914.
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Edge-Functionalized Graphene Nanoribbon Chemical Sensor : Comparison with Carbon Nanotube and Graphene. / Cho, Kyeong Min; Cho, Soo Yeon; Chong, Sanggyu; Koh, Hyeong Jun; Kim, Daewoo; Kim, Jihan; Jung, Hee Tae.

In: ACS Applied Materials and Interfaces, Vol. 10, No. 49, 12.12.2018, p. 42905-42914.

Research output: Contribution to journalArticle

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AU - Cho, Kyeong Min

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AU - Jung, Hee Tae

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