PMID- 21714517
OWN - NLM
STAT- MEDLINE
DCOM- 20111103
LR  - 20131121
IS  - 1520-5827 (Electronic)
IS  - 0743-7463 (Linking)
VI  - 27
IP  - 15
DP  - 2011 Aug 2
TI  - Ethanol-assisted graphene oxide-based thin film formation at pentane-water 
      interface.
PG  - 9174-81
LID - 10.1021/la201230k [doi]
AB  - Graphene oxide (GO) can be viewed as an amphiphilic soft material, which form 
      thin films at organic solvent-water interfaces. However, organic solvent 
      evaporation provides little driving force, which results in slow GO transfer in 
      aqueous phase, thus dawdling GO film formation processes for various potential 
      applications. We present an ethanol-assisted self-assembly method for the quick 
      formation of GO or GO-based composite thin films with tunable composition, 
      transmittance, and surface resistivity at pentane-water interface. The thickness 
      of pure GO and reduced GO (rGO) films ranging from ~1 nm to more than 10 nm can 
      be controlled by the concentration of GO in bulk solution. The transmittance of 
      rGO films can be tuned from 72% to 97% at 550 nm while the surface resistivity 
      changes from 8.3 to 464.6 kOmega sq(-1). Ethanol is essential for achieving quick 
      formation of GO thin films. When ethanol is injected into GO aqueous dispersion, 
      it serves as a nonsolvent, compromising the stability of GO and providing driving 
      force to allow GO sheets aggregate at the water-pentane interface. On the other 
      hand, neither the evaporation of pentane nor the mixing between ethanol and water 
      provides sufficient driving forces to allow noteworthy amount of GO sheets to 
      migrate from the bulk aqueous phase to the interface. This method can also be 
      extended to prepare GO-based composites thin films with tunable composition, such 
      as GO/single walled carbon nanotube (SWCNT) composite thin films investigated in 
      this work. Reduced GO/SWCNT composite films show much lower surface resistivity 
      compared to pure rGO thin films. This ethanol-assisted self-assembly method opens 
      opportunities to design and fabricate new functional GO-based hybrid materials 
      for various potential applications.
FAU - Chen, Fuming
AU  - Chen F
AD  - School of Chemical and Biomedical Engineering, Nanyang Technological University, 
      62 Nanyang Drive, Singapore 637459, Singapore.
FAU - Liu, Shaobin
AU  - Liu S
FAU - Shen, Jianmin
AU  - Shen J
FAU - Wei, Li
AU  - Wei L
FAU - Liu, Andong
AU  - Liu A
FAU - Chan-Park, Mary B
AU  - Chan-Park MB
FAU - Chen, Yuan
AU  - Chen Y
LA  - eng
PT  - Journal Article
PT  - Research Support, Non-U.S. Gov't
DEP - 20110629
PL  - United States
TA  - Langmuir
JT  - Langmuir : the ACS journal of surfaces and colloids
JID - 9882736
RN  - 0 (Membranes, Artificial)
RN  - 0 (Oxides)
RN  - 0 (Pentanes)
RN  - 059QF0KO0R (Water)
RN  - 3K9958V90M (Ethanol)
RN  - 4FEX897A91 (pentane)
RN  - 7782-42-5 (Graphite)
SB  - IM
MH  - Ethanol/*chemistry
MH  - Graphite/*chemistry
MH  - *Membranes, Artificial
MH  - Oxides/*chemistry
MH  - Particle Size
MH  - Pentanes/*chemistry
MH  - Surface Properties
MH  - Water/*chemistry
EDAT- 2011/07/01 06:00
MHDA- 2011/11/04 06:00
CRDT- 2011/07/01 06:00
PHST- 2011/07/01 06:00 [entrez]
PHST- 2011/07/01 06:00 [pubmed]
PHST- 2011/11/04 06:00 [medline]
AID - 10.1021/la201230k [doi]
PST - ppublish
SO  - Langmuir. 2011 Aug 2;27(15):9174-81. doi: 10.1021/la201230k. Epub 2011 Jun 29.