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Dynamic electric field alignment of metal-organic framework micro- rods (2019)
Journal Article
Cheng, F., Young, A. J., Bouillard, J. G., Kemp, N. T., Guillet-Nicolas, R., Hall, C. H., …Chin, J. M. (2019). Dynamic electric field alignment of metal-organic framework micro- rods. Journal of the American Chemical Society, 141(33), 12989-12993. https://doi.org/10.1021/jacs.9b06320

Alignment of Metal Organic Framework (MOF) crystals has previously been performed via careful control of oriented MOF growth on substrates, as well as by dynamic magnetic alignment. We show here that microrod crystals of the MOF NU-1000 can also be d... Read More

Wavelength dependent light tunable resistive switching graphene oxide nonvolatile memory devices (2019)
Journal Article
Jaafar, A. H., & Kemp, N. T. (2019). Wavelength dependent light tunable resistive switching graphene oxide nonvolatile memory devices. Carbon, 153, 81-88. https://doi.org/10.1016/j.carbon.2019.07.007

This paper reports on the first optically tunable graphene oxide memristor device. Modulation of resistive switching memory by light opens the route to new optoelectronic devices that can be switched optically and read electronically. Applications in... Read More

Percolation threshold enables optical resistive‐memory switching and light‐tuneable synaptic learning in segregated nanocomposites (2019)
Journal Article
Jaafar, A. H., O'Neill, M., Kelly, S. M., Verrelli, E., & Kemp, N. T. (2019). Percolation threshold enables optical resistive‐memory switching and light‐tuneable synaptic learning in segregated nanocomposites. Advanced Electronic Materials, 5(7), https://doi.org/10.1002/aelm.201900197

An optical memristor where the electrical resistance memory depends on the history of both the current flowing through the device and the irradiance of incident light onto it is demonstrated. It is based on a nanocomposite consisting of functionalize... Read More

A label-free aptamer-based nanogap capacitive biosensor with greatly diminished electrode polarization effects (2019)
Journal Article
Ghobaei Namhil, Z., Kemp, C., Verrelli, E., Iles, A., Pamme, N., Adawi, A. M., & Kemp, N. (2019). A label-free aptamer-based nanogap capacitive biosensor with greatly diminished electrode polarization effects. Physical chemistry chemical physics : PCCP, 21(2), 681-691. https://doi.org/10.1039/c8cp05510f

A significant impediment to the use of impedance spectroscopy in bio-sensing is the electrode polarization effect that arises from the movement of free ions to the electrode-solution interface, forming an electrical double layer (EDL). The EDL screen... Read More

Passive memristor synaptic circuits with multiple timing dependent plasticity mechanisms (2018)
Journal Article
Šuch, O., Klimo, M., Kemp, N. T., & Škvarek, O. (2018). Passive memristor synaptic circuits with multiple timing dependent plasticity mechanisms. AEÜ - International Journal of Electronics and Communications / Archiv für Elektronik und Übertragungstechnik, 96, 252-259. https://doi.org/10.1016/j.aeue.2018.09.025

Adaptation of synaptic strength is central to memory and learning in biological systems, enabling important high-level processes such as the ability of animals to respond to a changing environment. Memristor devices are a promising new, nanoscale tec... Read More

Lyotropic 'hairy' TiO2 nanorods (2018)
Journal Article
Cheng, F., Verrelli, E., Alharthi, F. A., Kelly, S. M., O'Neill, M., Kemp, N. T., …Anthopoulos, T. (2019). Lyotropic 'hairy' TiO2 nanorods. Nanoscale advances, 1(1), 254-264. https://doi.org/10.1039/c8na00054a

We report the synthesis of the first stable, solution-processable and photocrosslinkable hybrid organic/inorganic titanium dioxide nanorods as ‘hairy rods’ coated with phosphonate ligands with photoreactive coumarin groups located in a terminal posit... Read More

Method to reduce the formation of crystallites in ZnO nanorod thin-films grown via ultra-fast microwave heating (2018)
Journal Article
Gray, R. J., Jaafar, A. H., Verrelli, E., & Kemp, N. T. (2018). Method to reduce the formation of crystallites in ZnO nanorod thin-films grown via ultra-fast microwave heating. Thin solid films, 662, 116-122. https://doi.org/10.1016/j.tsf.2018.07.034

© 2018 This paper discusses the nucleation and growth mechanisms of ZnO nanorod thin-films and larger sized crystallites that form within the solution and on surfaces during an ultra-fast microwave heating growth process. In particular, the work focu... Read More

An Optically-Programmable Absorbing Metasurface (2018)
Journal Article
Kossifos, K. M., Antoniades, M. A., Georgiou, J., Jaafar, A. H., & Kemp, N. T. (2018). An Optically-Programmable Absorbing Metasurface. IEEE International Symposium on Circuits and Systems, 2018-May, https://doi.org/10.1109/ISCAS.2018.8351874

A tunable metasurface absorber is presented in this work using an optically-programmable capacitor as the tuning element. The tuning element does not employ conventional semiconductor technologies to operate but rather a bases its tuning by changing... Read More

Chua mem-components for adaptive RF metamaterials (2018)
Journal Article
Georgiou, J., Kossifos, K. M., Antoniades, M. A., Jaafar, A., & Kemp, N. T. (2018). Chua mem-components for adaptive RF metamaterials. IEEE International Symposium on Circuits and Systems, 2018-May, https://doi.org/10.1109/ISCAS.2018.8351852

Chua's mem-components are ideal for creating adaptive metasurfaces for manipulating EM waves given that they hold their state without external biases. In this paper, we propose a generic adaptive reactive element that is in fact a memcapacitor/memind... Read More

Solution-processable, niobium-doped titanium oxide nanorods for application in low-voltage, large-area electronic devices (2017)
Journal Article
Alharthi, F. A., Cheng, F., Verrelli, E., Kemp, N. T., Lee, A. F., Isaacs, M. A., …Kelly, S. M. (2017). Solution-processable, niobium-doped titanium oxide nanorods for application in low-voltage, large-area electronic devices. Journal of materials chemistry. publ. by The Royal Society of Chemistry. C, Materials for optical and electronic devices /, 6(5), 1038-1047. https://doi.org/10.1039/c7tc04197g

We report for the first time the one-step synthesis of solution-processable, highly crystalline, niobiumdoped titanium dioxide (Nb-TiO2) nanorods in the anatase phase by the hydrolytic condensation of Ti(OiPr)4 and niobium(V) ethoxide using oleic aci... Read More

Reversible optical switching memristors with tunable STDP synaptic plasticity: a route to hierarchical control in artificial intelligent systems (2017)
Journal Article
Jaafar, A. H., Gray, R. J., Verrelli, E., O'Neill, M., Kelly, S. M., & Kemp, N. T. (2017). Reversible optical switching memristors with tunable STDP synaptic plasticity: a route to hierarchical control in artificial intelligent systems. Nanoscale, 9(43), 17091-17098. https://doi.org/10.1039/c7nr06138b

© 2017 The Royal Society of Chemistry. Optical control of memristors opens the route to new applications in optoelectronic switching and neuromorphic computing. Motivated by the need for reversible and latched optical switching we report on the devel... Read More

Modelling and simulation analysis for the prediction of the performance of intrinsic conducting polymer current limiting device (2017)
Journal Article
Jabarullah, N. H., Mauldin, C., Navarro, L. A., Golden, J., Madianos, L., & Kemp, N. T. (2017). Modelling and simulation analysis for the prediction of the performance of intrinsic conducting polymer current limiting device. Advanced science letters, 23(6), 5117-5120. https://doi.org/10.1166/asl.2017.7322

© 2017 American Scientific Publishers All rights reserved. Previous studies have shown that the current limiting concept and interruption of short-circuit currents in low power applications have been introduced, particularly in polymer switch based o... Read More

Large dopant dependence of the current limiting properties of intrinsic conducting polymer surge protection devices (2016)
Journal Article
Jabarullah, N. H., Verrelli, E., Gee, A., Mauldin, C., Navarro, L. A., Golden, J. H., & Kemp, N. T. (in press). Large dopant dependence of the current limiting properties of intrinsic conducting polymer surge protection devices. RSC advances, 6(89), 85710-85717. https://doi.org/10.1039/c6ra18549e

New two terminal surge protection devices based on intrinsic conducting polymers are demonstrated to be strongly affected by the dopant molecule type. Thermogravimetric analysis combined with current–voltage studies show a causal link between the dop... Read More

Super hydrophobic SAM modified electrodes for enhanced current limiting properties in intrinsic conducting polymer surge protection devices (2015)
Journal Article
Jabarullah, N. H., Verrelli, E., Mauldin, C., Navarro, L. A., Golden, J. H., Madianos, L. M., & Kemp, N. T. (2015). Super hydrophobic SAM modified electrodes for enhanced current limiting properties in intrinsic conducting polymer surge protection devices. Langmuir : the ACS journal of surfaces and colloids, 31(22), 6253-6264. https://doi.org/10.1021/acs.langmuir.5b00686

Surface interface engineering using superhydrophobic gold electrodes made with 1-dodecanethiol self-assembled monolayer (SAM) has been used to enhance the current limiting properties of novel surge protection devices based on the intrinsic conducting... Read More

Microwave oven fabricated hybrid memristor devices for non-volatile memory storage (2014)
Journal Article
Verrelli, E., Gray, R. J., O'Neill, M., Kelly, S. M., & Kemp, N. T. (2014). Microwave oven fabricated hybrid memristor devices for non-volatile memory storage. Materials Research Express, 1(4), https://doi.org/10.1088/2053-1591/1/4/046305

© 2014 IOP Publishing Ltd. Novel hybrid non-volatile memories made using an ultra-fast microwave heating method are reported for the first time. The devices, consisting of aligned ZnO nanorods embedded in poly (methyl methacrylate), require no formin... Read More

Novel conducting polymer current limiting devices for low cost surge protection applications (2014)
Journal Article
Jabarullah, N. H., Verrelli, E., Mauldin, C., Navarro, L. A., Golden, J., Madianos, L., …Kemp, N. T. (2014). Novel conducting polymer current limiting devices for low cost surge protection applications. Journal of applied physics, 116(16), 164501. https://doi.org/10.1063/1.4899246

We report on the development of novel intrinsic conducting polymer two terminal surge protection devices. These resettable current limiting devices consist of polyaniline nanofibres doped with methane sulphonic acid electrochemically deposited betwee... Read More

The magnetoelectrochemical switch (2014)
Journal Article
Lunca Popa, P., Kemp, N. T., Majjad, H., Dalmas, G., Faramarzi, V., Andreas, C., …Doudin, B. (2014). The magnetoelectrochemical switch. Proceedings of the National Academy of Sciences of the United States of America, 111(29), 10433-10437. https://doi.org/10.1073/pnas.1322828111

In the field of spintronics, the archetype solid-state two-terminal device is the spin valve, where the resistance is controlled by the magnetization configuration. We show here how this concept of spin-dependent switch can be extended to magnetic el... Read More

Heteronanojunctions with atomic size control using a lab-on-chip electrochemical approach with integrated microfluidics (2011)
Journal Article
Popa, P. L., Dalmas, G., Faramarzi, V., Dayen, J. F., Majjad, H., Kemp, N. T., & Doudin, B. (2011). Heteronanojunctions with atomic size control using a lab-on-chip electrochemical approach with integrated microfluidics. Nanotechnology, 22(21), 215302. https://doi.org/10.1088/0957-4484/22/21/215302

A versatile tool for electrochemical fabrication of heteronanojunctions with nanocontacts made of a few atoms and nanogaps of molecular spacing is presented. By integrating microfluidic circuitry in a lab-on-chip approach, we keep control of the elec... Read More

Magnetoresistance signature of resonant states in electromigrated Ni nanocontacts (2011)
Journal Article
Beaufrand, J. B., Dayen, J. F., Kemp, N. T., Sokolov, A., & Doudin, B. (2011). Magnetoresistance signature of resonant states in electromigrated Ni nanocontacts. Applied physics letters, 98(14), 142504-1 - 142504-3. https://doi.org/10.1063/1.3576939

Fundamental insight is reported into magnetoresistance properties of ballistic-type atomic size Ni nanojunctions obtained at low temperatures. Feedback-controlled electromigration was used to reveal the ballistic nature of the transport and stabilize... Read More

Electronic transport in conducting polymer nanowire array devices (2011)
Journal Article
Kemp, N. T., Newbury, R., Cochrane, J. W., & Dujardin, E. (2011). Electronic transport in conducting polymer nanowire array devices. Nanotechnology, 22(10), https://doi.org/10.1088/0957-4484/22/10/105202

We report on the temperature dependent conductivity and current-voltage (I-V) properties of novel polyaniline nanowire array devices. Below 60 K, I-V measurements show a transition to non-linear behaviour, leading to the onset at 30 K of a threshold... Read More