Synthesis-in-place of highly-conjugated oligothiophene micropatterns via photo-activated Ullmann coupling on copper surface

Natarajan, Sudarshan; Kim, Seong H.

doi:10.1039/b515087f

Cited by 19 publications

(13 citation statements)

References 17 publications

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“…XPS results of the point iv was compared to the point iii in Figure 2a obtained where they were defined as Cu (I) and Cu (0). 41,42 In particular, that of sample iv was in agreement with as-received Cu plate shown in Supporting Information Figure S2a. A small satellite peak at ca.…”

Section: Resultssupporting

confidence: 83%

New approach for enhancing electrical conductivity of electrodeposited Si-based anode material for Li secondary batteries: Self-incorporation of nano Cu metal in Si–O–C composite

et al. 2016

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The poor electrical conductivity of Si-based anode materials is a critical challenge for the development of high-performance Li secondary batteries. We propose a new approach for enhancing the electrical conductivity of an electrodeposited Si-O-C composite anode via selfincorporation of nano Cu metal (n-Cu) using a facile and inexpensive electrochemical synthetic method. The Si-O-C composite with n-Cu (Cu/Si-O-C composite) shows stable cycle performance with a fairly high specific capacity. Since Cu precursor ions for the electrodeposition of n-Cu are directly dissolved from a Cu substrate used as the current collector for the anode, electrical conducting additives that causes increase in the weight and volume of the electrode are not unnecessarily supplemented. In the synthesis process, the n-Cu metal and Si-O-C composite are electrodeposited simultaneously. The n-Cu/Si-O-C composite anode results in improved electrochemical performance, including enhancement of areal and specific capacity; coulombic efficiency; and rate capability. Electrochemical impedance spectroscopy suggests that such improvements in performance are due to the enhanced electrical conductivity resulting from the conductive network of the incorporated n-Cu. Moreover, the electrical conductive properties of the incorporated n-Cu suppress electrochemical degradation of the n-Cu/Si-O-C composite anode.

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Section: Resultssupporting

confidence: 83%

New approach for enhancing electrical conductivity of electrodeposited Si-based anode material for Li secondary batteries: Self-incorporation of nano Cu metal in Si–O–C composite

et al. 2016

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“…Recently, we have extended the use of iodo-substituted compounds to generation of functional organic molecules or films on surfaces. For example, 2,5-diiodothiophene can be photochemically activated and coupled to produce thin films and micropatterns of oligothiophenes and polythiophenes on metal or oxide surfaces [4][5][6][7][8][9][10][11]. This approach is intriguing since it avoids the intractability problem of the unsubstituted oligothiophenes and polythiophene, i.e.…”

Section: Introductionmentioning

confidence: 99%

Thermal reaction and desorption behaviors of 2,5-diiodothiophene on clean and passivated Au surfaces

Ryoo

Kim

2007

Surface Science

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“…UV irradiation of 2,5-diiodothiophene during the multilayer deposition can cause the photodissociation of C−I bonds in some molecules. The recombination of the produced thienyl radicals leads to formation of oligothiophene species. ,− On flat substrate surfaces, these oligothiophene species aggregate into randomly oriented dendritic structures with a fractal dimension varying from 1.37 to 1.81 depending on the surface concentration of oligothiophene species. These random dendritic patterns can be aligned into a certain direction using topographical modification of the substrate surface.…”

Section: Introductionmentioning

confidence: 99%

Dendritic Aggregation of Oligothiophene during Desorption of 2,5-Diiodothiophene Multilayer and Topography-Induced Alignment of Oligothiophene Nanofibers

et al. 2006

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The multilayer desorption behavior of 2,5-diidothiophene and the dendritic aggregation of photochemical reaction products during the desorption of 2,5-diiodothiophene multilayers have been studied. Like many other aromatic compounds, 2,5-diiodothiophene shows a multilayer desorption behavior different from the typical zeroth-order kinetics, a metastable desorption peak growth at approximately 220 K followed by a thick multilayer peak growth at approximately 235 K. Traditionally, these desorption behaviors have been attributed to the formation of three-dimensional clusters. This paper provides the direct evidence of this clustering process by producing nondesorbing photoreaction products in the multilayer and by imaging their clusters after the multilayer desorption. Oligothiophene species are produced via photochemical reactions of 2,5-diiodothiophene during the multilayer deposition at approximately 180 K in ultrahigh vacuum (UHV). Upon heating the multilayer to room temperature, the oligothiophene species forms into fibrous aggregates with a fractal dimension varying from 1.37 to 1.81 depending on their surface concentration. Using a topographical alteration of the substrate with a repeating pattern, these oligothiophene fibers can be aligned to a certain direction. This may allow in-situ fabrication of aligned conjugated polymer fibers directly on a target substrate.

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Synthesis-in-place of highly-conjugated oligothiophene micropatterns via photo-activated Ullmann coupling on copper surface

Abstract: In contrast to the traditional thermally-activated Ullmann coupling, a photo-activated Ullmann coupling for facile synthesis of oligothiophene and polythiophene films and micropatterns is reported.

Cited by 19 publications

References 17 publications

New approach for enhancing electrical conductivity of electrodeposited Si-based anode material for Li secondary batteries: Self-incorporation of nano Cu metal in Si–O–C composite

New approach for enhancing electrical conductivity of electrodeposited Si-based anode material for Li secondary batteries: Self-incorporation of nano Cu metal in Si–O–C composite

Thermal reaction and desorption behaviors of 2,5-diiodothiophene on clean and passivated Au surfaces

Dendritic Aggregation of Oligothiophene during Desorption of 2,5-Diiodothiophene Multilayer and Topography-Induced Alignment of Oligothiophene Nanofibers

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