Publications

@article{bell2016direct,

title = {Direct measurements reveal non-Markovian fluctuations of DNA threading through a solid-state nanopore},

author = {Nicholas AW Bell and Ulrich F Keyser},

url = {https://arxiv.org/abs/1607.04612},

year  = {2016},

date = {2016-01-01},

journal = {arXiv preprint arXiv:1607.04612},

abstract = {The threading of a polymer chain through a small pore is a classic problem in polymer dynamics and underlies nanopore sensing technology. However important experimental aspects of the polymer motion in a solid-state nanopore, such as an accurate measurement of the velocity variation during translocation, have remained elusive. In this work we analysed the translocation through conical quartz nanopores of a 7 kbp DNA double-strand labelled with six markers equally spaced along its contour. These markers, constructed from DNA hairpins, give direct experimental access to the translocation dynamics. On average we measure a 5% reduction in velocity during the translocation. We also find a striking correlation in velocity fluctuations with a decay constant of 100s of {mu}s. These results shed light on hitherto unresolved problems in the dynamics of DNA translocation and provide guidance for experiments seeking to determine positional information along a DNA strand.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{sokol2016research,

title = {Research data supporting "Rational Wiring of Photosystem II to Hierarchical Indium Tin Oxide Electrodes using Redox Polymers"},

author = {Katarzyna P Sokol and Dirk Mersch and Volker Hartmann and Jenny Z Zhang and Marc Nowaczyk and Matthias Rögner and Adrian Ruff and Wolfgang Schuhmann and Nicolas Plumeré and Erwin Reisner},

url = {https://www.repository.cam.ac.uk/handle/1810/256734},

year  = {2016},

date = {2016-01-01},

publisher = {University of Cambridge},

abstract = {Raw Data supporting publication: ' Rational Wiring of Photosystem II to Hierarchical Indium Tin Oxide Electrodes using Redox Polymers},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{tesoro2016nondeterministicb,

title = {Nondeterministic self-assembly with asymmetric interactions},

author = {Salvatore Tesoro and K Göpfrich and Tadas Kartanas and Ulrich Felix Keyser and Sebastian Edmund Ahnert},

url = {https://journals.aps.org/pre/abstract/10.1103/PhysRevE.94.022404},

year  = {2016},

date = {2016-01-01},

journal = {Physical Review E},

volume = {94},

number = {2},

pages = {022404},

publisher = {American Physical Society},

abstract = {We investigate general properties of nondeterministic self-assembly with asymmetric interactions, using a computational model and DNA tile assembly experiments. By contrasting symmetric and asymmetric interactions we show that the latter can lead to self-limiting cluster growth. Furthermore, by adjusting the relative abundance of self-assembly particles in a two-particle mixture, we are able to tune the final sizes of these clusters. We show that this is a fundamental property of asymmetric interactions, which has potential applications in bioengineering, and provides insights into the study of diseases caused by protein aggregation.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{morgenstern2016research,

title = {Research data supporting “Charge Generation and Electron Trapping Dynamics in Hybrid Nanocrystal-Polymer Solar Cells”},

author = {Frederik SF Morgenstern and Marcus L Böhm and René JP Kist and Aditya Sadhanala and Simon Gélinas and Akshay Rao and Neil C Greenham},

year  = {2016},

date = {2016-01-01},

publisher = {University of Cambridge},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{mertens2016tracking,

title = {Tracking optical welding through groove modes in plasmonic nanocavities},

author = {Jan Mertens, Angela Demetriadou, RW Bowman, F Benz, M-E Kleemann, ‪Christos Tserkezis‬, Y Shi, HY Yang, Ortwin Hess, Javier Aizpurua and others},

url = {https://pubs.acs.org/doi/abs/10.1021/acs.nanolett.6b02164},

year  = {2016},

date = {2016-01-01},

journal = {Nano letters},

volume = {16},

number = {9},

pages = {5605--5611},

publisher = {American Chemical Society},

abstract = {We report the light-induced formation of conductive links across nanometer-wide insulating gaps. These are realized by incorporating spacers of molecules or 2D monolayers inside a gold plasmonic nanoparticle-on-mirror (NPoM) geometry. Laser irradiation of individual NPoMs controllably reshapes and tunes the plasmonic system, in some cases forming conductive bridges between particle and substrate, which shorts the nanometer-wide plasmonic gaps geometrically and electronically. Dark-field spectroscopy monitors the bridge formation in situ, revealing strong plasmonic mode mixing dominated by clear anticrossings. Finite difference time domain simulations confirm this spectral evolution, which gives insights into the metal filament formation. A simple analytic cavity model describes the observed plasmonic mode hybridization between tightly confined plasmonic cavity modes and a radiative antenna mode sustained in the NPoM. Our results show how optics can reveal the properties of electrical transport across well-defined metallic nanogaps to study and develop technologies such as resistive memory devices (memristors).},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{dolan2016research,

title = {Research Data Supporting" Gyroid Optical Metamaterials: Calculating the Effective Permittivity of Multidomain Samples"},

author = {James A Dolan and Matthias Saba and Raphael Dehmel and Ilja Gunkel and Yibei Gu and Ulrich Wiesner and Ortwin Hess and Timothy D Wilkinson and Jeremy J Baumberg and Ullrich Steiner and others},

url = {https://www.repository.cam.ac.uk/bitstream/handle/1810/260150/Description.pdf?sequence=5},

year  = {2016},

date = {2016-01-01},

publisher = {University of Cambridge},

abstract = {The data is arranged into three folders (.zip files; bold), each of which contains the follow files (.tif and

.txt files; italics). This data and the descriptions below should be read in conjunction with the manuscript

(particularly the “Experimental Methods” section) and “supporting info”, both of which may be found at

the following DOI: http://pubs.acs.org/doi/abs/10.1021/acsphotonics.6b00400},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{george2016research,

title = {Research data supporting “Structural Evolution of Electrochemically Lithiated MoS2 Nanosheets and the Role of Carbon Additive in Li-Ion Batteries”},

author = {Chandramohan George and Andrew J Morris and Mohammad H Modarres and Michael De Volder},

url = {https://www.repository.cam.ac.uk/handle/1810/260253},

year  = {2016},

date = {2016-01-01},

publisher = {University of Cambridge},

abstract = {Crystallographic structure files of materials discovered in the research.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{zhang2016protein,

title = {Protein Aggregate-Ligand Binding Assays Based on Microfluidic Diffusional Separation},

author = {Yingbo Zhang and Alexander K Buell and Thomas Müller and Erwin De Genst and Justin Benesch and Christopher M Dobson and Tuomas PJ Knowles},

url = {https://chemistry-europe.onlinelibrary.wiley.com/doi/abs/10.1002/cbic.201600384},

year  = {2016},

date = {2016-01-01},

journal = {ChemBioChem},

volume = {17},

number = {20},

pages = {1920--1924},

publisher = {Wiley Online Library},

abstract = {The measurement of molecular interactions with pathological protein aggregates, including amyloid fibrils, is of central importance in the context of the development of diagnostic and therapeutic strategies against protein misfolding disorders. Probing such interactions by conventional methods can, however, be challenging because of the supramolecular nature of protein aggregates, their heterogeneity, and their often dynamic nature. Here we demonstrate that direct measurement of diffusion on a microfluidic platform enables the determination of affinity and kinetics data for ligand binding to amyloid fibrils in solution. This method yields rapid binding information from only microlitres of sample, and is therefore a powerful technique for identifying and characterising molecular species with potential therapeutic or diagnostic application.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{mertens2016research,

title = {Research data supporting “Tracking optical welding through groove modes in plasmonic nano-cavities”},

author = {Jan Mertens, ‪Angela Demetriadou, RW Bowman, F Benz, M-E Kleemann, ‪Christos Tserkezis, Y Shi, HY Yang, ‪Ortwin Hess,‪ Javier Aizpurua and others},

url = {https://www.repository.cam.ac.uk/handle/1810/257368},

year  = {2016},

date = {2016-01-01},

publisher = {University of Cambridge},

abstract = {Research data for the manuscript "Tracking optical welding through groove modes in plasmonic nano-cavities" published in Nano Letters},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{calahorra2016localized,

title = {Localized electromechanical interactions in ferroelectric P (VDF-TrFE) nanowires investigated by scanning probe microscopy},

author = {Yonatan Calahorra and Richard A Whiter and Qingshen Jing and Vijay Narayan and Sohini Kar-Narayan},

url = {https://aip.scitation.org/doi/full/10.1063/1.4967752},

year  = {2016},

date = {2016-01-01},

journal = {Apl Materials},

volume = {4},

number = {11},

pages = {116106},

publisher = {AIP Publishing LLC},

abstract = {We investigate the electromechanical interactions in individual polyvinylidene fluoride-trifluoroethylene nanowires in response to localized electrical poling via a conducting atomic force microscope tip. Spatially resolved measurements of piezoelectric coefficients and elastic moduli before and after poling reveal a striking dependence on the polarity of the poling field, notably absent in thin films of the same composition. These observations are attributed to the unclamped nature of the nanowires and the inherent asymmetry in their chemical and electrical interactions with the tip and underlying substrate. Our findings provide insights into the mechanism of poling/switching in polymer nanowires critical to ferroelectric device performance.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{salmon2016microcapsule,

title = {Microcapsule buckling triggered by compression-induced interfacial phase change},

author = {Andrew R Salmon and Richard M Parker and Alexander S Groombridge and Armando Maestro and Roger J Coulston and Jonas Hegemann and Jan Kierfeld and Oren A Scherman and Chris Abell},

url = {https://pubs.acs.org/doi/abs/10.1021/acs.langmuir.6b03011},

year  = {2016},

date = {2016-01-01},

journal = {Langmuir},

volume = {32},

number = {42},

pages = {10987--10994},

publisher = {American Chemical Society},

abstract = {There is an emerging trend toward the fabrication of microcapsules at liquid interfaces. In order to control the parameters of such capsules, the interfacial processes governing their formation must be understood. Here, poly(vinyl alcohol) films are assembled at the interface of water-in-oil microfluidic droplets. The polymer is cross-linked using cucurbit[8]uril ternary supramolecular complexes. It is shown that compression-induced phase change causes the onset of buckling in the interfacial film. On evaporative compression, the interfacial film both increases in density and thickens, until it reaches a critical density and a phase change occurs. We show that this increase in density can be simply related to the film Poisson ratio and area compression. This description captures fundamentals of many compressive interfacial phase changes and can also explain the observation of a fixed thickness-to-radius ratio at buckling, .},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{george2016structural,

title = {Structural evolution of electrochemically lithiated MoS2 nanosheets and the role of carbon additive in Li-ion batteries},

author = {Chandramohan George and Andrew J Morris and Mohammad H Modarres and Michael De Volder},

url = {https://pubs.acs.org/doi/abs/10.1021/acs.chemmater.6b02607},

year  = {2016},

date = {2016-01-01},

journal = {Chemistry of Materials},

volume = {28},

number = {20},

pages = {7304--7310},

publisher = {American Chemical Society},

abstract = {Understanding the structure and phase changes associated with conversion-type materials is key to optimizing their electrochemical performance in Li-ion batteries. For example, molybdenum disulfide (MoS2) offers a capacity up to 3-fold higher (∼1 Ah/g) than the currently used graphite anodes, but they suffer from limited Coulombic efficiency and capacity fading. The lack of insights into the structural dynamics induced by electrochemical conversion of MoS2 still hampers its implementation in high energy-density batteries. Here, by combining ab initio density-functional theory (DFT) simulation with electrochemical analysis, we found new sulfur-enriched intermediates that progressively insulate MoS2 electrodes and cause instability from the first discharge cycle. Because of this, the choice of conductive additives is critical for the battery performance. We investigate the mechanistic role of carbon additive by comparing equal loading of standard Super P carbon powder and carbon nanotubes (CNTs). The latter offer a nearly 2-fold increase in capacity and a 45% reduction in resistance along with Coulombic efficiency of over 90%. These insights into the phase changes during MoS2 conversion reactions and stabilization methods provide new solutions for implementing cost-effective metal sulfide electrodes, including Li–S systems in high energy-density batteries.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{dolan2016gyroid,

title = {Gyroid optical metamaterials: Calculating the effective permittivity of multidomain samples},

author = {James A Dolan and Matthias Saba and Raphael Dehmel and Ilja Gunkel and Yibei Gu and Ulrich Wiesner and Ortwin Hess and Timothy D Wilkinson and Jeremy J Baumberg and Ullrich Steiner and others},

url = {https://pubs.acs.org/doi/abs/10.1021/acsphotonics.6b00400},

year  = {2016},

date = {2016-01-01},

journal = {ACS photonics},

volume = {3},

number = {10},

pages = {1888--1896},

publisher = {American Chemical Society},

abstract = {Gold gyroid optical metamaterials are known to possess a reduced plasma frequency and linear dichroism imparted by their intricate subwavelength single gyroid morphology. The anisotropic optical properties are, however, only evident when a large individual gyroid domain is investigated. Multidomain gyroid metamaterials, fabricated using a polyisoprene-b-polystyrene-b-poly(ethylene oxide) triblock terpolymer and consisting of multiple small gyroid domains with random orientation and handedness, instead exhibit isotropic optical properties. Comparing three effective medium models, we here show that the specular reflectance spectra of such multidomain gyroid optical metamaterials can be accurately modeled over a broad range of incident angles by a Bruggeman effective medium consisting of a random wire array. This model accurately reproduces previously published results tracking the variation in normal incidence reflectance spectra of gold gyroid optical metamaterials as a function of host refractive index and volume fill fraction of gold. The effective permittivity derived from this theory confirms the change in sign of the real part of the permittivity in the visible spectral region (so, that gold gyroid metamaterials exhibit both dielectric and metallic behavior at optical wavelengths). That a Bruggeman effective medium can accurately model the experimental reflectance spectra implies that small multidomain gold gyroid optical metamaterials behave both qualitatively and quantitatively as an amorphous composite of gold and air (i.e., nanoporous gold) and that coherent electromagnetic contributions arising from the subwavelength gyroid symmetry are not dominant.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{michan2016fluoroethylene,

title = {Fluoroethylene carbonate and vinylene carbonate reduction: Understanding lithium-ion battery electrolyte additives and solid electrolyte interphase formation},

author = {Alison L Michan and Bharathy S Parimalam and Michal Leskes and Rachel N Kerber and Taeho Yoon and Clare P Grey and Brett L Lucht},

url = {https://pubs.acs.org/doi/abs/10.1021/acs.chemmater.6b02282},

year  = {2016},

date = {2016-01-01},

journal = {Chemistry of Materials},

volume = {28},

number = {22},

pages = {8149--8159},

publisher = {American Chemical Society},

abstract = {We have synthesized the products of fluoroethylene carbonate (FEC) and vinylene carbonate (VC) via lithium naphthalenide reduction. By analyzing the resulting solid precipitates and gas evolution, our results confirm that both FEC and VC decomposition products include HCO2Li, Li2C2O4, Li2CO3, and polymerized VC. For FEC, our experimental data supports a reduction mechanism where FEC reduces to form VC and LiF, followed by subsequent VC reduction. In the FEC reduction product, HCO2Li, Li2C2O4, and Li2CO3 were found in smaller quantities than in the VC reduction product, with no additional fluorine environments being detected by solid-state nuclear magnetic resonance or X-ray photoelectron spectroscopy analysis. With these additives being practically used in higher (FEC) and lower (VC) concentrations in the base electrolytes of lithium-ion batteries, our results suggest that the different relative ratios of the inorganic and organic reduction products formed by their decomposition may be relevant to the chemical composition and morphology of the solid electrolyte interphase formed in their presence.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{di2016research,

title = {Research data supporting “p-wave triggered superconductivity in single layer graphene on an electron-doped oxide superconductor”},

author = {A Di Bernardo and O Millo and M Barbone and H Alpern and Y Kalcheim and U Sassi and AK Ott and D De Fazio and D Yoon and M Amado and others},

url = {https://www.repository.cam.ac.uk/handle/1810/261051},

year  = {2016},

date = {2016-01-01},

publisher = {University of Cambridge},

abstract = {Measurements data collected in several institutions including the Racah Institute of Physics (STM data), at the Cambridge Graphene Centre (Raman spectroscopy data) and Department of Materials Science and Metallurgy (XRD and electronic transport data).},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{calahorra2016research,

title = {Research data supporting "Localized electromechanical interactions in ferroelectric P (VDF-TrFE) nanowires investigated by scanning probe microscopy"},

author = {Yonatan Calahorra and Richard A Whiter and Qingshen Jing and Vijay Narayan and Sohini Kar-Narayan},

url = {https://www.repository.cam.ac.uk/handle/1810/261039},

year  = {2016},

date = {2016-01-01},

publisher = {University of Cambridge},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{morgenstern2016charge,

title = {Charge generation and electron-trapping dynamics in hybrid nanocrystal-polymer solar cells},

author = {Frederik SF Morgenstern and Marcus L Böhm and René JP Kist and Aditya Sadhanala and Simon Gélinas and Akshay Rao and Neil C Greenham},

url = {https://pubs.acs.org/doi/abs/10.1021/acs.jpcc.6b07591},

year  = {2016},

date = {2016-01-01},

journal = {The Journal of Physical Chemistry C},

volume = {120},

number = {34},

pages = {19064--19069},

publisher = {American Chemical Society},

abstract = {We investigate the charge-trapping dynamics in hybrid nanocrystal-polymer systems and their effect on performance in photovoltaic devices. Employing various steady-state spectroscopy techniques and ultrafast, three-pulse transient absorption methods, we identify the depth of electron trap states in the nanocrystal band gap and measure their population dynamics. Our findings show that photogenerated electrons are trapped at midgap states on the nanocrystal within hundreds of picoseconds. The trapping of the majority of charge carriers before charge extraction results in a lowering of the quasi-Fermi level of the electrons which limits the device open-circuit voltage, thereby underlining the significance of these processes in conjugated polymer/nanocrystal hybrid photovoltaics.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{d2016stable,

title = {Stable, efficient p-type doping of graphene by nitric acid},

author = {Lorenzo DÁrsié and Santiago Esconjauregui and Robert S Weatherup and Xingyi Wu and William E Arter and Hisashi Sugime and Cinzia Cepek and John Robertson},

url = {https://pubs.rsc.org/en/content/articlelanding/2016/ra/c6ra23727d/unauth#!divAbstract},

year  = {2016},

date = {2016-01-01},

journal = {RSC advances},

volume = {6},

number = {114},

pages = {113185--113192},

publisher = {Royal Society of Chemistry},

abstract = {We systematically dope monolayer graphene with different concentrations of nitric acid over a range of temperatures, and analyze the variation of sheet resistance after vacuum annealing up to 300 °C. The optimized HNO3 doping conditions yield sheet resistances as low as 180 Ω sq.−1, which is significantly more stable under vacuum annealing than previously reported values. Raman and photoemission spectroscopy suggest that this stable graphene doping occurs by a bi-modal mechanism. Under mild conditions the dopants are weakly bonded to graphene, but at high acid temperatures and concentrations, the doping is higher and more stable upon post-doping annealing, without causing significant lattice damage. This work shows that large, stable hole concentrations can be induced by transfer doping in graphene.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}