Influence of chemical treatment on the electrical conductivity and thermopower of expanded graphite foils

Mina Rastegaralam, Mingxing Piao, Gyu-Tae Kim, Urszula Dettlaff-Weglikowska, Siegmar Roth

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

We investigated the interaction of chemical materials with flexible graphite foils which were fabricated from the expanded graphite (EG) flakes by mechanical rolling and compressing. A variety of performed experiments demonstrated that the electrical conductivity and thermoelectric power (TEP) of the graphite foils can be modified by chemical treatments. In particular, the "as prepared" p-type graphite foil was successfully transferred into an n-type doped material upon a treatment with amine containing compounds. Generally, the acceptor-like chemicals increasing the concentration of the electric charge carriers enhanced the conductivity of the graphite foils, thereby, showing a decrease in the TEP reflected by the Seebeck coefficient, whereas the donor molecules significantly affected the conductivity and changed the sign and value of the TEP. Thermal and electrical insulating polymers, such as PVDF, PMMA, PVA, PS or PC, filling the inter-lamellar spacing reduced the conductivity of the foil due to increase of the layer-to-layer resistance. They also blocked heat flow in the foil, and consequently increased the Seebeck coefficient.

Original languageEnglish
Pages (from-to)1183-1187
Number of pages5
JournalPhysica Status Solidi (C) Current Topics in Solid State Physics
Volume10
Issue number7-8
DOIs
Publication statusPublished - 2013 Aug 1

Fingerprint

foils
graphite
electrical resistivity
Seebeck effect
conductivity
flakes
electric charge
compressing
heat transmission
charge carriers
amines
spacing
polymers
molecules
interactions

Keywords

  • Chemical treatment
  • Electrical conductivity
  • Expanded graphite
  • Seebeck coefficient

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

Influence of chemical treatment on the electrical conductivity and thermopower of expanded graphite foils. / Rastegaralam, Mina; Piao, Mingxing; Kim, Gyu-Tae; Dettlaff-Weglikowska, Urszula; Roth, Siegmar.

In: Physica Status Solidi (C) Current Topics in Solid State Physics, Vol. 10, No. 7-8, 01.08.2013, p. 1183-1187.

Research output: Contribution to journalArticle

Rastegaralam, Mina ; Piao, Mingxing ; Kim, Gyu-Tae ; Dettlaff-Weglikowska, Urszula ; Roth, Siegmar. / Influence of chemical treatment on the electrical conductivity and thermopower of expanded graphite foils. In: Physica Status Solidi (C) Current Topics in Solid State Physics. 2013 ; Vol. 10, No. 7-8. pp. 1183-1187.
@article{c2b4e86b68284cfab31909e0b6f20616,
title = "Influence of chemical treatment on the electrical conductivity and thermopower of expanded graphite foils",
abstract = "We investigated the interaction of chemical materials with flexible graphite foils which were fabricated from the expanded graphite (EG) flakes by mechanical rolling and compressing. A variety of performed experiments demonstrated that the electrical conductivity and thermoelectric power (TEP) of the graphite foils can be modified by chemical treatments. In particular, the {"}as prepared{"} p-type graphite foil was successfully transferred into an n-type doped material upon a treatment with amine containing compounds. Generally, the acceptor-like chemicals increasing the concentration of the electric charge carriers enhanced the conductivity of the graphite foils, thereby, showing a decrease in the TEP reflected by the Seebeck coefficient, whereas the donor molecules significantly affected the conductivity and changed the sign and value of the TEP. Thermal and electrical insulating polymers, such as PVDF, PMMA, PVA, PS or PC, filling the inter-lamellar spacing reduced the conductivity of the foil due to increase of the layer-to-layer resistance. They also blocked heat flow in the foil, and consequently increased the Seebeck coefficient.",
keywords = "Chemical treatment, Electrical conductivity, Expanded graphite, Seebeck coefficient",
author = "Mina Rastegaralam and Mingxing Piao and Gyu-Tae Kim and Urszula Dettlaff-Weglikowska and Siegmar Roth",
year = "2013",
month = "8",
day = "1",
doi = "10.1002/pssc.201200973",
language = "English",
volume = "10",
pages = "1183--1187",
journal = "Physica Status Solidi (C) Current Topics in Solid State Physics",
issn = "1862-6351",
publisher = "Wiley-VCH Verlag",
number = "7-8",

}

TY - JOUR

T1 - Influence of chemical treatment on the electrical conductivity and thermopower of expanded graphite foils

AU - Rastegaralam, Mina

AU - Piao, Mingxing

AU - Kim, Gyu-Tae

AU - Dettlaff-Weglikowska, Urszula

AU - Roth, Siegmar

PY - 2013/8/1

Y1 - 2013/8/1

N2 - We investigated the interaction of chemical materials with flexible graphite foils which were fabricated from the expanded graphite (EG) flakes by mechanical rolling and compressing. A variety of performed experiments demonstrated that the electrical conductivity and thermoelectric power (TEP) of the graphite foils can be modified by chemical treatments. In particular, the "as prepared" p-type graphite foil was successfully transferred into an n-type doped material upon a treatment with amine containing compounds. Generally, the acceptor-like chemicals increasing the concentration of the electric charge carriers enhanced the conductivity of the graphite foils, thereby, showing a decrease in the TEP reflected by the Seebeck coefficient, whereas the donor molecules significantly affected the conductivity and changed the sign and value of the TEP. Thermal and electrical insulating polymers, such as PVDF, PMMA, PVA, PS or PC, filling the inter-lamellar spacing reduced the conductivity of the foil due to increase of the layer-to-layer resistance. They also blocked heat flow in the foil, and consequently increased the Seebeck coefficient.

AB - We investigated the interaction of chemical materials with flexible graphite foils which were fabricated from the expanded graphite (EG) flakes by mechanical rolling and compressing. A variety of performed experiments demonstrated that the electrical conductivity and thermoelectric power (TEP) of the graphite foils can be modified by chemical treatments. In particular, the "as prepared" p-type graphite foil was successfully transferred into an n-type doped material upon a treatment with amine containing compounds. Generally, the acceptor-like chemicals increasing the concentration of the electric charge carriers enhanced the conductivity of the graphite foils, thereby, showing a decrease in the TEP reflected by the Seebeck coefficient, whereas the donor molecules significantly affected the conductivity and changed the sign and value of the TEP. Thermal and electrical insulating polymers, such as PVDF, PMMA, PVA, PS or PC, filling the inter-lamellar spacing reduced the conductivity of the foil due to increase of the layer-to-layer resistance. They also blocked heat flow in the foil, and consequently increased the Seebeck coefficient.

KW - Chemical treatment

KW - Electrical conductivity

KW - Expanded graphite

KW - Seebeck coefficient

UR - http://www.scopus.com/inward/record.url?scp=84881542424&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84881542424&partnerID=8YFLogxK

U2 - 10.1002/pssc.201200973

DO - 10.1002/pssc.201200973

M3 - Article

AN - SCOPUS:84881542424

VL - 10

SP - 1183

EP - 1187

JO - Physica Status Solidi (C) Current Topics in Solid State Physics

JF - Physica Status Solidi (C) Current Topics in Solid State Physics

SN - 1862-6351

IS - 7-8

ER -