4.6 Article

Spatially Resolved Spontaneous Reactivity of Diazonium Salt on Edge and Basal Plane of Graphene without Surfactant and Its Doping Effect

Journal

LANGMUIR
Volume 26, Issue 14, Pages 12278-12284

Publisher

AMER CHEMICAL SOC
DOI: 10.1021/la101254k

Keywords

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Funding

  1. MEST [2008-04306, 2007-8-1158, 2005-01325]
  2. KOSEF through EPB center [R11-2008-052-02000]
  3. Ministry of Health, Welfare Family Affairs [A0900062]
  4. Korean Research Foundation (MOEHRD) [KRE-2005-005-J13103]
  5. World Class University (WCU) [R31-2008-000-10059-0, R31-2008-000-20012-0]
  6. Ministry of Education, Science & Technology (MoST), Republic of Korea [R31-2008-000-10059-0] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
  7. National Research Foundation of Korea [2005-2001325, 2008-56529, 2009-0094037, 2009-0090897, R31-2008-000-20012-0, 2008-04306] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)

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The site-dependent and spontaneous functionalization of 4-bromobenzene diazonium tetralluoroborate (4-BBDT) and its doping effect on a mechanically exfoliated graphene (MEG) were investigated. The spatially resolved Raman spectra obtained from both edge and basal region of MEG revealed that 4-BBDT molecules were noncovalently functionalized on the basal region of MEG, while they were covalently bonded to the edge of MEG. The chemical doping effect induced by noncovalently functionalized 4-BBDT molecules on a basal plane region of MEG was successfully explicated by Raman spectroscopy. The position of Fermi level of MEG and the type of doping charge carrier induced by the noncovalently adsorbed 4-BBDT molecules were determined from systematic G band and 2D band changes. The successful spectroscopic elucidation of the different bonding characters of 4-BBDT depending on the site of graphene is beneficial for the fundamental studies about the charge transfer phenomena of graphene as well as for the potential applications, such as electronic devices, hybridized composite structures, etc.

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