Power factor enhancement for few-layered graphene films by molecular attachments

Daohao Sim; Dayong Liu; Xiaochen Dong; Ni Xiao; Sean Li; Yang Zhao; Lain Jong Li; Qingyu Yan; Huey Hoon Hng

doi:10.1021/jp1103609

Power factor enhancement for few-layered graphene films by molecular attachments

Daohao Sim, Dayong Liu, Xiaochen Dong, Ni Xiao, Sean Li, Yang Zhao, Lain Jong Li, Qingyu Yan^*, Huey Hoon Hng

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

39 Scopus citations

Abstract

In this work, we prepared few-layered graphene (FLG) films and investigated their thermoelectric properties. It was found that pristine FLG films showed a low thermopower of ∼40 μV/K. We further processed these FLG films by attaching them with 1,1′-azobis(cyanocyclohexane) or 1,3,6,8- pyrenetetrasulfonic acid. The thermopower of FLG films with attached molecules increased to above ∼180 μV/K. Such enhancement in the thermopower led to an increase in their power factor by more than 4.5 times. Theoretical investigation indicated that a potential difference can be introduced between the outer layer and inner layer of FLG films upon molecule attachments. Simulation of the thermopower based on Kubo's formula provided qualitative support to our experimental results.

Original language	English (US)
Pages (from-to)	1780-1785
Number of pages	6
Journal	JOURNAL OF PHYSICAL CHEMISTRY C
Volume	115
Issue number	5
DOIs	https://doi.org/10.1021/jp1103609
State	Published - Feb 10 2011
Externally published	Yes

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
General Energy
Physical and Theoretical Chemistry
Surfaces, Coatings and Films

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10.1021/jp1103609

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title = "Power factor enhancement for few-layered graphene films by molecular attachments",

abstract = "In this work, we prepared few-layered graphene (FLG) films and investigated their thermoelectric properties. It was found that pristine FLG films showed a low thermopower of ∼40 μV/K. We further processed these FLG films by attaching them with 1,1′-azobis(cyanocyclohexane) or 1,3,6,8- pyrenetetrasulfonic acid. The thermopower of FLG films with attached molecules increased to above ∼180 μV/K. Such enhancement in the thermopower led to an increase in their power factor by more than 4.5 times. Theoretical investigation indicated that a potential difference can be introduced between the outer layer and inner layer of FLG films upon molecule attachments. Simulation of the thermopower based on Kubo's formula provided qualitative support to our experimental results.",

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AU - Sim, Daohao

AU - Liu, Dayong

AU - Dong, Xiaochen

AU - Xiao, Ni

AU - Li, Sean

AU - Zhao, Yang

AU - Li, Lain Jong

AU - Yan, Qingyu

AU - Hng, Huey Hoon

PY - 2011/2/10

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AB - In this work, we prepared few-layered graphene (FLG) films and investigated their thermoelectric properties. It was found that pristine FLG films showed a low thermopower of ∼40 μV/K. We further processed these FLG films by attaching them with 1,1′-azobis(cyanocyclohexane) or 1,3,6,8- pyrenetetrasulfonic acid. The thermopower of FLG films with attached molecules increased to above ∼180 μV/K. Such enhancement in the thermopower led to an increase in their power factor by more than 4.5 times. Theoretical investigation indicated that a potential difference can be introduced between the outer layer and inner layer of FLG films upon molecule attachments. Simulation of the thermopower based on Kubo's formula provided qualitative support to our experimental results.

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Power factor enhancement for few-layered graphene films by molecular attachments

Abstract

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