Iodine versus Bromine Functionalization for Bottom-Up Graphene Nanoribbon Growth: Role of Diffusion
- Univ. of California, Berkeley, CA (United States). Dept. of Physics
- Univ. of California, Berkeley, CA (United States). Dept. of Chemistry
- Aarhus Univ. (Denmark). iNANO. Dept. of Physics and Astronomy
- 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.
- 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
Web of Science
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 |
Similar Records
Tuning the morphology of chevron-type graphene nanoribbons by choice of annealing temperature
Atomically precise graphene nanoribbon heterojunctions from a single molecular precursor