Research Topics
| Jonathan N ColemanSummaryAffiliation: Trinity College Country: Ireland Publications
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Publications
Liquid exfoliation of defect-free grapheneJonathan N Coleman
School of Physics and CRANN, Trinity College Dublin, Ireland
Acc Chem Res 46:14-22. 2013..We believe the coming decade will see an explosion in the applications involving liquid exfoliated two-dimensional materials...
Two-dimensional nanosheets produced by liquid exfoliation of layered materialsJonathan N Coleman
School of Physics and Centre for Research on Adaptive Nanostructures and Nanodevices CRANN, Trinity College Dublin, D2, Ireland
Science 331:568-71. 2011..We show that WS(2) and MoS(2) effectively reinforce polymers, whereas WS(2)/carbon nanotube hybrid films have high conductivity, leading to promising thermoelectric properties...- Flexible, transparent, conducting films of randomly stacked graphene from surfactant-stabilized, oxide-free graphene dispersionsSukanta De
School of Physics, Centre for Research on Adaptive Nanostructures and Nanodevices CRANN, Trinity College Dublin, University of Dublin, Dublin 2, Ireland
Small 6:458-64. 2010..5 x 10(4) S m(-1). The conductivity is stable under flexing for at least 2000 cycles. The electrical properties are limited by disorder and aggregation suggesting future routes for improvement... - Liquid phase production of graphene by exfoliation of graphite in surfactant/water solutionsMustafa Lotya
School of Physics, Trinity College Dublin, Dublin 2, Ireland
J Am Chem Soc 131:3611-20. 2009..Vacuum filtered films are reasonably conductive and are semitransparent. Further improvements may result in the development of cheap transparent conductors... - Silver Nanowire Networks as Flexible, Transparent, Conducting Films: Extremely High DC to Optical Conductivity RatiosSukanta De
School of Physics, Trinity College Dublin, Dublin 2, Ireland
ACS Nano 3:1767-74. 2009..We have prepared films with optical transmittance and sheet resistance of 85% and 13 Ω/◻, respectively. This is very close to that displayed by commercially available indium tin oxide... - High-concentration solvent exfoliation of grapheneUmar Khan
School of Physics and CRANN, Trinity College Dublin, Dublin 2, Ireland
Small 6:864-71. 2010..The dispersions can be heavily diluted by water without sedimentation or aggregation. This method facilitates graphene processing for a range of applications... - High-concentration, surfactant-stabilized graphene dispersionsMustafa Lotya
School of Physics, Trinity College Dublin, Dublin 2, Ireland
ACS Nano 4:3155-62. 2010..The dispersions can be easily cast into high-quality, free-standing films. The method extends the scope for scalable liquid-phase processing of graphene for a wide range of applications... - Spray deposition of highly transparent, low-resistance networks of silver nanowires over large areasVittorio Scardaci
Centre for Research on Adaptive Nanostructure and Nanodevices, Trinity College Dublin, Dublin 2, Ireland
Small 7:2621-8. 2011..Optimizing the pressure reduces the droplet size resulting in more uniform networks. High uniformity leads to a low percolation exponent, which is essential for low-resistance, high-transparency films... - Tuning the mechanical properties of composites from elastomeric to rigid thermoplastic by controlled addition of carbon nanotubesUmar Khan
School of Physics, Trinity College Dublin, Dublin 2, Ireland
Small 7:1579-86. 2011..5 GPa, σ(ϵ = 3%) = 36 MPa, σ(B) = 55 MPa, ϵ(B) = 100% and T = 50 MJ m(-3) . Analysis suggests that soft polyurethane segments are immobilized by adsorption onto the nanotubes, resulting in large changes in mechanical properties... - Improved adhesive strength and toughness of polyvinyl acetate glue on addition of small quantities of grapheneUmar Khan
School of Physics and CRANN, Trinity College Dublin, Dublin 2, Ireland
ACS Appl Mater Interfaces 5:1423-8. 2013..As PVAc is commonly used commercially as a glue, we have tested such composites as adhesives. The adhesive strength and toughness of the composites were up to 4 and 7 times higher, respectively, than the pristine polymer... - Polymer reinforcement using liquid-exfoliated boron nitride nanosheetsUmar Khan
Centre for Research on Adaptive Nanostructures and Nanodevices CRANN and School of Physics, Trinity College Dublin, Dublin 2, Ireland
Nanoscale 5:581-7. 2013..This phenomenon has also been observed for graphene-filled composites and represents a serious hurdle to the production of high performance polymer-nanosheet composites... - Size effects and the problem with percolation in nanostructured transparent conductorsSukanta De
School of Physics and CRANN, Trinity College Dublin, Dublin 2, Ireland
ACS Nano 4:7064-72. 2010..However, the large flake thickness results in high t(min) and so low Π, resulting in actual values of T = 26% for R(s) = 100 Ω/◻. This makes this material completely unsuitable for transparent conductor applications... - Using solution thermodynamics to describe the dispersion of rod-like solutes: application to dispersions of carbon nanotubes in organic solventsJ Marguerite Hughes
School of Physics and CRANN, Trinity College Dublin, University of Dublin, Dublin 2, Ireland
Nanotechnology 23:265604. 2012..Qualitative agreement with these predictions is observed experimentally. However, we suggest that the fact that quantitative agreement is not found may be explained by solvent ordering at the nanotube surface... - Covalently functionalized hexagonal boron nitride nanosheets by nitrene additionToby Sainsbury
School of Physics and CRANN, Trinity College Dublin, Dublin 2, Ireland
Chemistry 18:10808-12. 2012..This integration methodology was further extended by the covalent modification of the h-BN nanosheets with polymer chains of a polycarbonate analogue, and the integration of the polymer modified h-BN within the polymer matrix... - Transparent conducting films from NbSe3 nanowiresSukanta De
School of Physics and CRANN, Trinity College Dublin, Dublin 2, Ireland
Nanotechnology 22:285202. 2011..32, similar to graphene networks. Thickness measurements gave individual values of σ(Op) = 17,800 S m(-1) and σ(DC, B) = 5700 S m(-1). Films thinner than ∼ 70 nm displayed reduced DC conductivity due to percolative effects... - Percolation scaling in composites of exfoliated MoS2 filled with nanotubes and grapheneGraeme Cunningham
School of Physics and CRANN, Trinity College Dublin, Dublin 2, Ireland
Nanoscale 4:6260-4. 2012..In the case of SWNT-filled composites, conductivities as high as ~40 S m(-1) were achieved at volume fractions as low as ~4%... - The dependence of the optoelectrical properties of silver nanowire networks on nanowire length and diameterSophie Sorel
Centre for Research on Adaptive Nanostructures and Nanodevices and School of Physics, Trinity College Dublin, Dublin 2, Ireland
Nanotechnology 23:185201. 2012..We predict that networks of wires with D = 25 nm could give sheet resistance as low as 25 Ω/□ for T = 90%... - Percolation effects in supercapacitors with thin, transparent carbon nanotube electrodesPaul J King
School of Physics and CRANN, Trinity College Dublin, Dublin 2, Ireland
ACS Nano 6:1732-41. 2012..For example, replacing electrodes with transparency of T = 80% with thinner networks displaying T = 97% will result in a 20-fold reduction of both power and energy density... - Efficient dispersion and exfoliation of single-walled nanotubes in 3-aminopropyltriethoxysilane and its derivativesZhenyu Sun
Centre for Research on Adaptive Nanostructures and Nanodevices, Trinity College Dublin, University of Dublin, Dublin 2, Republic of Ireland School of Physics, Trinity College Dublin, University of Dublin, Dublin 2, Republic of Ireland
Nanotechnology 19:485702. 2008..Further experimental results showed that nanotubes can also be effectively dispersed in a series of aminoalkoxylsilane derivatives. In the light of these findings, possible solvent-nanotube interaction mechanisms are discussed... - Solvent-exfoliated graphene at extremely high concentrationUmar Khan
School of Physics and CRANN, Trinity College Dublin, Dublin 2, Ireland
Langmuir 27:9077-82. 2011..The dispersed flakes are ~1 μm long and ~3 to 4 layers thick on average. Although some sedimentation occurs, ~26-28 mg/mL of the dispersed graphene appears to be indefinitely stable... - Manipulating connectivity and electrical conductivity in metallic nanowire networksPeter N Nirmalraj
School of Chemistry, Trinity College Dublin, Dublin 2, Ireland
Nano Lett 12:5966-71. 2012..We demonstrate how local connectivity within these networks can be programmed and discuss material and device applications... - Solvent exfoliation of transition metal dichalcogenides: dispersibility of exfoliated nanosheets varies only weakly between compoundsGraeme Cunningham
School of Physics and CRANN, Trinity College Dublin, Dublin 2, Ireland
ACS Nano 6:3468-80. 2012..Finally, we note that in good solvents, such as cyclohexylpyrrolidone, the dispersions are temporally stable with >90% of material remaining dispersed after 100 h... - Towards tough, yet stiff, composites by filling an elastomer with single-walled nanotubes at very high loading levelsFiona M Blighe
School of Physics, Trinity College Dublin, Dublin 2, Ireland
Nanotechnology 19:415709. 2008..Depending on the nanotube content we can produce films ranging from the stiff and brittle at high nanotube loading to the compliant and ductile at low nanotube volume fraction... - High quality dispersions of hexabenzocoronene in organic solventsJ Marguerite Hughes
School of Physics and CRANN, Trinity College Dublin, University of Dublin, Dublin 2, Ireland
J Am Chem Soc 134:12168-79. 2012..We believe this is strong evidence of the presence of individual molecules in dispersions prepared with appropriate solvents... - Strong dependence of mechanical properties on fiber diameter for polymer-nanotube composite fibers: differentiating defect from orientation effectsKaren Young
School of Physics, Trinity College Dublin, University of Dublin, Dublin 2, Ireland
ACS Nano 4:6989-97. 2010..The orientation term is present and dominates for fibers of diameter between 4 and 50 μm. By preparing fibers with low diameter (1-2 μm), we have obtained mean mechanical properties as high as Y = 244 GPa and σ(B) = 2.9 GPa... - Ordered DNA wrapping switches on luminescence in single-walled nanotube dispersionsHelen Cathcart
School of Physics, Trinity College Dublin, University of Dublin, Dublin 2, Ireland
J Am Chem Soc 130:12734-44. 2008..These negative activation entropies suggest that the rate-limiting step is characterized by a change in the system from a less-ordered to a more-ordered state, consistent with the formation of an ordered DNA coating... - Are there fundamental limitations on the sheet resistance and transmittance of thin graphene films?Sukanta De
School of Physics and CRANN, Trinity College Dublin, Dublin 2, Ireland
ACS Nano 4:2713-20. 2010..3 x 10(17) V(-1) s(-1). Given achieved doping values and attainable mobilities, this is just possible, resulting in potential values of sigma(DC)/sigma(Op) of up to 330. This is high enough for any transparent conductor application... - Multicomponent solubility parameters for single-walled carbon nanotube-solvent mixturesShane D Bergin
School of Physics, Trinity College Dublin, Dublin 2, Ireland
ACS Nano 3:2340-50. 2009..The nature of the distinction between solvents and nonsolvents remains to be fully understood... - Transparent, flexible, and highly conductive thin films based on polymer-nanotube compositesSukanta De
School of Physics, Trinity College Dublin, Dublin 2, Ireland
ACS Nano 3:714-20. 2009..This translates into transmittance (550 nm) and sheet resistance of 75 and 80 Omega/square, respectively. These composites were electromechanically very stable, showing <1% resistance change over 130 bend cycles... - High-yield production of graphene by liquid-phase exfoliation of graphiteYenny Hernandez
School of Physics, Trinity College Dublin, Dublin 2, Ireland
Nat Nanotechnol 3:563-8. 2008..We are able to produce semi-transparent conducting films and conducting composites. Solution processing of graphene opens up a range of potential large-area applications, from device and sensor fabrication to liquid-phase chemistry...