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Title: Ultrasensitive gas detection of large-area boron-doped graphene

Heteroatom doping is an efficient way to modify the chemical and electronic properties of graphene. In particular, boron doping is expected to induce a p-type conducting behavior to pristine (undoped) graphene which could lead to diverse applications. But, the experimental progress on atomic scale visualization and sensing properties of large-area boron-doped graphene (BG) sheets is still very scarce. This work describes the controlled growth of centimeter size, high-crystallinity BG sheets. Scanning tunneling microscopy and spectroscopy are used to visualize the atomic structure and the local density of states around boron dopants. We confirmed that BG behaves as a p-type conductor and a unique croissant-like feature is frequently observed within the BG lattice, which is caused by the presence of B-C trimmers embedded within the hexagonal lattice. Interestingly, it is demonstrated for the first time that BG exhibits unique sensing capabilities when detecting toxic gases, such as NO2 and NH3 , being able to detect extremely low concentrations (e.g. parts per trillion, parts per billion). Our work envisions that other attractive applications could now be explored based on as-synthesized BG.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [5] ;  [6] ; ORCiD logo [7] ;  [5] ;  [4] ;  [8] ;  [4] ;  [4] ;  [9] ;  [4] ;  [10] ;  [11] ;  [5] ;  [7] ;  [12] ;  [2] more »;  [6] ;  [13] « less
  1. Tsinghua Univ., Beijing (China); Pennsylvania State Univ., University Park, PA (United States)
  2. Honda Research Inst. USA Inc., Columbus, OH (United States)
  3. Soochow Univ., Jiangsu (China)
  4. Pennsylvania State Univ., University Park, PA (United States)
  5. Catholic Univ. of Louvain (Belgium)
  6. Univ. of Manchester (United Kingdom)
  7. Rensselaer Polytechnic Inst., Troy, NY (United States)
  8. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  9. Sinshu Univ., Nagano (Japan)
  10. Shinshu Univ., Nagano (Japan)
  11. Tsinghua Univ., Beijing (China)
  12. Huazhong Univ. of Science and Technology, Wuhan (China)
  13. Pennsylvania State Univ., University Park, PA (United States); Shinshu Univ., Nagano (Japan)
Publication Date:
OSTI Identifier:
1235191
Grant/Contract Number:
AC05-00OR22725; 2014CB932401; ARO-; Center for Nanophase Materials Sciences (CNMS)
Type:
Published Article
Journal Name:
Proceedings of the National Academy of Sciences of the United States of America
Additional Journal Information:
Journal Volume: 112; Journal Issue: 47; Journal ID: ISSN 0027-8424
Publisher:
National Academy of Sciences, Washington, DC (United States)
Research Org:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; graphene; doping; gas sensing; STM; STS