PMID- 27397115
OWN - NLM
STAT- PubMed-not-MEDLINE
DCOM- 20180718
LR  - 20180718
IS  - 1936-086X (Electronic)
IS  - 1936-0851 (Linking)
VI  - 10
IP  - 8
DP  - 2016 Aug 23
TI  - Chemistry and Structure of Graphene Oxide via Direct Imaging.
PG  - 7515-22
LID - 10.1021/acsnano.6b02391 [doi]
AB  - Graphene oxide (GO) and reduced GO (rGO) are the only variants of graphene that 
      can be manufactured at the kilogram scale, and yet the widely accepted model for 
      their structure has largely relied on indirect evidence. Notably, existing 
      high-resolution transmission electron microscopy (HRTEM) studies of graphene 
      oxide report long-range order of sp(2) lattice with isolated defect clusters. 
      Here, we present HRTEM evidence of a different structural form of GO, where 
      nanocrystalline regions of sp(2) lattice are surrounded by regions of disorder. 
      The presence of contaminants that adsorb to the surface of the material at room 
      temperature normally prevents direct observation of the intrinsic atomic 
      structure of this defective GO. To overcome this, we use an in situ heating 
      holder within an aberration-corrected TEM (AC-TEM) to study the atomic structure 
      of this nanocrystalline graphene oxide from room temperature to 700  degrees C. As the 
      temperature increases to above 500  degrees C, the adsorbates detach from the GO and the 
      underlying atomic structure is imaged to be small 2-4 nm crystalline domains 
      within a polycrystalline GO film. By combining spectroscopic evidence with the 
      AC-TEM data, we support the dynamic interpretation of the structural evolution of 
      graphene oxide.
FAU - Dave, Shreya H
AU  - Dave SH
FAU - Gong, Chuncheng
AU  - Gong C
AD  - Department of Materials, University of Oxford , Parks Road, Oxford OX1 3PH, 
      United Kingdom.
FAU - Robertson, Alex W
AU  - Robertson AW
AD  - Department of Materials, University of Oxford , Parks Road, Oxford OX1 3PH, 
      United Kingdom.
FAU - Warner, Jamie H
AU  - Warner JH
AD  - Department of Materials, University of Oxford , Parks Road, Oxford OX1 3PH, 
      United Kingdom.
FAU - Grossman, Jeffrey C
AU  - Grossman JC
LA  - eng
PT  - Journal Article
PT  - Research Support, Non-U.S. Gov't
PT  - Research Support, U.S. Gov't, Non-P.H.S.
DEP - 20160719
PL  - United States
TA  - ACS Nano
JT  - ACS nano
JID - 101313589
EIN - ACS Nano. 2017 Jan 24;11(1):1121. PMID: 28026164
OTO - NOTNLM
OT  - AC-TEM
OT  - TEM
OT  - graphene oxide
OT  - surface contaminants
EDAT- 2016/07/12 06:00
MHDA- 2016/07/12 06:01
CRDT- 2016/07/12 06:00
PHST- 2016/07/12 06:00 [entrez]
PHST- 2016/07/12 06:00 [pubmed]
PHST- 2016/07/12 06:01 [medline]
AID - 10.1021/acsnano.6b02391 [doi]
PST - ppublish
SO  - ACS Nano. 2016 Aug 23;10(8):7515-22. doi: 10.1021/acsnano.6b02391. Epub 2016 Jul 
      19.