Change of Structural Behaviors of Organo-Silane Exposed Graphene Nanoflakes

CW Pao, SC Ray, HM Tsai, HC Chen, IN Lin, WF Pong, JW Chiou, MH Tsai, NG Shang, P Papakonstantinou, GH GuO

Research output: Contribution to journalArticle

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Abstract

The electronic structures of graphene nanoflakes (GNFs) exposed to an organo-silane precursor [tetramethylsilane, TMS, Si(CH3)4] were studied using electron field emission (EFE), Raman spectroscopy, X-ray absorption near-edge structure (XANES), X-ray photoelectron spectroscopy (XPS), X-ray emission spectroscopy (XES), and first-principles calculation. The results of XANES, XPS, and Raman spectroscopy indicate that the silyl radical strong covalent bonds were formed in GNFs, which induced local structural relaxations and enhanced sp3 hybridization. Comparison of calculated electronic structure, XANES, and XES spectra of Si-treated GNFs suggests that the Si atom substitutes one 3-fold coordinated C atom in a given graphene layer and relaxes outward to form sp3 bonding with another C atom in the adjacent graphene layer. The EFE measurements show an increase in the turn-on electric field with the increase of the Si content, which suggests an enhancement of the nonmetallic sp3 bonding.
LanguageEnglish
Pages8161-8166
JournalJournal Of Physical Chemistry C
Volume114
DOIs
Publication statusPublished - Apr 2010

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Silanes
Graphite
X ray absorption
Field emission
Atoms
Electronic structure
Raman spectroscopy
X ray photoelectron spectroscopy
Structural relaxation
Covalent bonds
Electrons
Electric fields

Cite this

Pao, CW., Ray, SC., Tsai, HM., Chen, HC., Lin, IN., Pong, WF., ... GuO, GH. (2010). Change of Structural Behaviors of Organo-Silane Exposed Graphene Nanoflakes. Journal Of Physical Chemistry C, 114, 8161-8166. https://doi.org/10.1021/jp9121563
Pao, CW ; Ray, SC ; Tsai, HM ; Chen, HC ; Lin, IN ; Pong, WF ; Chiou, JW ; Tsai, MH ; Shang, NG ; Papakonstantinou, P ; GuO, GH. / Change of Structural Behaviors of Organo-Silane Exposed Graphene Nanoflakes. In: Journal Of Physical Chemistry C. 2010 ; Vol. 114. pp. 8161-8166.
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Pao, CW, Ray, SC, Tsai, HM, Chen, HC, Lin, IN, Pong, WF, Chiou, JW, Tsai, MH, Shang, NG, Papakonstantinou, P & GuO, GH 2010, 'Change of Structural Behaviors of Organo-Silane Exposed Graphene Nanoflakes', Journal Of Physical Chemistry C, vol. 114, pp. 8161-8166. https://doi.org/10.1021/jp9121563

Change of Structural Behaviors of Organo-Silane Exposed Graphene Nanoflakes. / Pao, CW; Ray, SC; Tsai, HM; Chen, HC; Lin, IN; Pong, WF; Chiou, JW; Tsai, MH; Shang, NG; Papakonstantinou, P; GuO, GH.

In: Journal Of Physical Chemistry C, Vol. 114, 04.2010, p. 8161-8166.

Research output: Contribution to journalArticle

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T1 - Change of Structural Behaviors of Organo-Silane Exposed Graphene Nanoflakes

AU - Pao, CW

AU - Ray, SC

AU - Tsai, HM

AU - Chen, HC

AU - Lin, IN

AU - Pong, WF

AU - Chiou, JW

AU - Tsai, MH

AU - Shang, NG

AU - Papakonstantinou, P

AU - GuO, GH

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AB - The electronic structures of graphene nanoflakes (GNFs) exposed to an organo-silane precursor [tetramethylsilane, TMS, Si(CH3)4] were studied using electron field emission (EFE), Raman spectroscopy, X-ray absorption near-edge structure (XANES), X-ray photoelectron spectroscopy (XPS), X-ray emission spectroscopy (XES), and first-principles calculation. The results of XANES, XPS, and Raman spectroscopy indicate that the silyl radical strong covalent bonds were formed in GNFs, which induced local structural relaxations and enhanced sp3 hybridization. Comparison of calculated electronic structure, XANES, and XES spectra of Si-treated GNFs suggests that the Si atom substitutes one 3-fold coordinated C atom in a given graphene layer and relaxes outward to form sp3 bonding with another C atom in the adjacent graphene layer. The EFE measurements show an increase in the turn-on electric field with the increase of the Si content, which suggests an enhancement of the nonmetallic sp3 bonding.

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