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Title: Iodine versus Bromine Functionalization for Bottom-Up Graphene Nanoribbon Growth: Role of Diffusion

Journal Article · · Journal of Physical Chemistry. C
ORCiD logo [1];  [2];  [1];  [2];  [3]; ORCiD logo [4];  [5]
  1. Univ. of California, Berkeley, CA (United States). Dept. of Physics
  2. Univ. of California, Berkeley, CA (United States). Dept. of Chemistry
  3. Aarhus Univ. (Denmark). iNANO. Dept. of Physics and Astronomy
  4. Univ. of California, Berkeley, CA (United States). Dept. of Chemistry; Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Materials Sciences Division. Kavli Energy NanoSciences Inst.
  5. Univ. of California, Berkeley, CA (United States). Dept. of Physics; Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Materials Sciences Division. Kavli Energy NanoSciences Inst.

Deterministic bottom-up approaches for synthesizing atomically well-defined graphene nanoribbons (GNRs) largely rely on the surface-catalyzed activation of selected labile bonds in a molecular precursor followed by step-growth polymerization and cyclodehydrogenation. While the majority of successful GNR precursors rely on the homolytic cleavage of thermally labile C–Br bonds, the introduction of weaker C–I bonds provides access to monomers that can be polymerized at significantly lower temperatures, thus helping to increase the flexibility of the GNR synthesis process. Scanning tunneling microscopy imaging of molecular precursors, activated intermediates, and polymers resulting from stepwise thermal annealing of both Br and I substituted precursors for chevron GNRs reveals that the polymerization of both precursors proceeds at similar temperatures on Au(111). Finally, this surprising observation is consistent with diffusion-controlled polymerization of the surface-stabilized radical intermediates that emerge from homolytic cleavage of either the C–Br or the C–I bonds.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); Office of Naval Research (ONR) (United States); Academy of Sciences Leopoldina (Germany)
Grant/Contract Number:
AC02-05CH11231; SC0010409; LPDS 2014-09
OSTI ID:
1436639
Journal Information:
Journal of Physical Chemistry. C, Vol. 121, Issue 34; ISSN 1932-7447
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 27 works
Citation information provided by
Web of Science

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Cited By (4)

On-surface synthesis of superlattice arrays of ultra-long graphene nanoribbons journal January 2018
Modified Engineering of Graphene Nanoribbons Prepared via On‐Surface Synthesis journal December 2019
On-surface synthesis of 2D COFs on Cu(111) via the formation of thermodynamically stable organometallic networks as the template journal January 2019
Synthesis of armchair graphene nanoribbons from the 10,10′-dibromo-9,9′-bianthracene molecules on Ag(111): the role of organometallic intermediates journal February 2018

Figures / Tables (5)


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