Publications

@article{lin2012cu,

title = {Cu 2 O| NiO x nanocomposite as an inexpensive photocathode in photoelectrochemical water splitting},

author = {Chia-Yu Lin and Yi-Hsuan Lai and Dirk Mersch and Erwin Reisner},

url = {https://pubs.rsc.org/en/content/articlelanding/2012/sc/c2sc20874a/unauth#!divAbstract},

year  = {2012},

date = {2012-01-01},

journal = {Chemical Science},

volume = {3},

number = {12},

pages = {3482--3487},

publisher = {Royal Society of Chemistry},

abstract = {A photoelectrochemical (PEC) cell for overall water splitting made of a Cu2O nanowire photocathode modified with a thin film of NiOx coupled to a WO3 nanosheet photoanode is presented. The photocathode was prepared by thermal annealing of Cu(OH)2 nanowires on a Cu foil under N2, followed by the deposition of a 10 nm NiOx film on the Cu2O nanowires (aspect ratio > 40). XPS spectra revealed that the surface species of NiOx is a mixture of NiO and Ni(OH)2, which enhances charge separation in photoexcited Cu2O, as confirmed by electrochemical impedance spectroscopy. The optimized NiOx modified Cu2O electrode shows a photocurrent density up to −4.98 mA cm−2 at −0.33 V and −0.56 mA cm−2 at 0.1 V vs. the normal hydrogen electrode (NHE) under white-light irradiation (26 mW cm−2) in an aqueous electrolyte solution at pH 6 and 25 °C. The formation of H2 gas was only observed by gas chromatography for NiOx-modified Cu2O and was not detectable for unmodified Cu2O electrodes during prolonged irradiation. The nanocomposite structure also resulted in a three-fold increase in photostability of Cu2O; 72 ± 3% of the initial photocurrent density remained for the NiOx modified Cu2O electrode after 20 min irradiation at 0.1 V vs. NHE. The optimized photocathode was subsequently used in a two-electrode PEC cell with an n-type WO3 nanosheet photoanode for overall water splitting. The different band gap of Cu2O (2 eV) and WO3 (2.6 eV) permits for efficient and complementary light absorption and sunlight-driven water splitting. The p/n heterojunction PEC cell operates with a small output of electricity even in the absence of an external bias. We demonstrate that a Cu2O-based electrode for H2 evolution can be prepared free of noble metals and we show its utilization in a PEC water splitting cell made solely from earth abundant elements.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{muresan2012immobilization,

title = {Immobilization of a molecular cobaloxime catalyst for hydrogen evolution on a mesoporous metal oxide electrode},

author = {Nicoleta M Muresan and Janina Willkomm and Dirk Mersch and Yana Vaynzof and Erwin Reisner},

url = {https://onlinelibrary.wiley.com/doi/abs/10.1002/ange.201207448},

year  = {2012},

date = {2012-01-01},

journal = {Angewandte Chemie},

volume = {124},

number = {51},

pages = {12921--12925},

publisher = {WILEY-VCH Verlag Weinheim},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{massabuau2012morphological,

title = {Morphological, structural, and emission characterization of trench defects in InGaN/GaN quantum well structures},

author = {FC-P Massabuau, S-L Sahonta, L Trinh-Xuan, S Rhode, Tim J Puchtler, MJ Kappers, Colin Humphreys and Rachel A Oliver},

url = {https://aip.scitation.org/doi/abs/10.1063/1.4768291},

year  = {2012},

date = {2012-01-01},

journal = {Applied Physics Letters},

volume = {101},

number = {21},

pages = {212107},

publisher = {American Institute of Physics},

abstract = {In a wide variety of InGaN/GaN quantum well (QW) structures, defects are observed which consist of a trench partially or fully enclosing a region of the QW having altered emission properties. For various different defect morphologies, cathodoluminescence studies suggest that the emission is redshifted in the enclosed region. Based on transmission electron microscopy and atomic force microscopy data, we suggest that the sub-surface structure of the trench defect consists of a basal plane stacking fault bounded by a stacking mismatch boundary, which terminates at the apex of a V-shaped trench.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{palfreyman2012hetero,

title = {Hetero-coated magnetic microcarriers for point-of-care diagnostics},

author = {Justin Palfreyman and David Love and Alistair Philpott and Kunal Vyas and Christian Cimorra and Thanos Mitrelias and Crispin Barnes and Liz Muir and Geoff Cook and Roger Keynes},

url = {https://ieeexplore.ieee.org/abstract/document/6392401},

year  = {2012},

date = {2012-01-01},

journal = {IEEE transactions on magnetics},

volume = {49},

number = {1},

pages = {285--295},

publisher = {IEEE},

abstract = {SU8 microcarriers containing magnetic thin film (40 nm cobalt) elements were fabricated by photolithography and thermal evaporation, and included a gold coating on the base. The microcarriers, which can be encoded with a magnetic barcode for later identification in a multiplexed suspension assay, now possess two distinct surfaces for further chemical derivitization. This allows us to attach different bio-molecules to each side, which we suggest, could be used to add a positive control to typical hybridization assays as a test for binding conditions, thus giving confidence against false negative events. As a proof-of-concept we developed a chemical pathway to attach 5',6'-tetramethyl rhodamine onto the gold coated side via the growth of a mixed self-assembled monolayer (characterized by Electrochemical Quartz Crystal Microbalance measurements), while also attaching fluorescein to the SU8 side after first adding a homo-bifunctional spacer to the native surface epoxide groups. Fluorescence microscopy was used to verify the success of this strategy and the feasibility of using PicoGreen as a post-hybridization reporter was studied.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{de2011dynamic,

title = {A dynamic covalent, luminescent metallopolymer that undergoes sol-to-gel transition on temperature rise},

author = {Xavier de Hatten and Nicholas Bell and Nataliya Yufa and Gabriel Christmann and Jonathan R Nitschke},

url = {https://pubs.acs.org/doi/abs/10.1021/ja110575s},

year  = {2011},

date = {2011-01-01},

journal = {Journal of the American Chemical Society},

volume = {133},

number = {9},

pages = {3158--3164},

publisher = {American Chemical Society},

abstract = {The condensation of linear diamine and dialdehyde subcomponents around copper(I) templates in the presence of bulky trioctylphosphine ancillary ligands gave a linear, conjugated polymeric material in DMSO solution. This polymer solution was observed to undergo sol-to-gel transition as the temperature was raised to 140 °C, in contrast with the behavior of most gel-forming polymers, which do so upon cooling. We attribute the sol-to-gel transition to the formation of CuIN4 cross-links as the equilibria 2[CuIN2P2] ⇄ [CuIN4] + [CuPn]+ + (4 − n)P favor the right-hand side at higher temperatures. The material was also observed to exhibit thermochromism and photoluminescence, with the color and intensity of both absorption and emission exhibiting temperature dependence. This material thus responds predictably to combinations of stimuli (heat, light, mechanical shear) in an interconnected way, as is required to generate complex function.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{bennett2011facile,

title = {Facile mechanosynthesis of amorphous zeolitic imidazolate frameworks},

author = {Thomas D Bennett and Shuai Cao and Jin Chong Tan and David A Keen and Erica G Bithell and Patrick J Beldon and Tomislav Friscic and Anthony K Cheetham},

url = {https://pubs.acs.org/doi/abs/10.1021/ja206082s},

year  = {2011},

date = {2011-01-01},

journal = {Journal of the American Chemical Society},

volume = {133},

number = {37},

pages = {14546--14549},

publisher = {American Chemical Society},

abstract = {A fast and efficient mechanosynthesis (ball-milling) method of preparing amorphous zeolitic imidazolate frameworks (ZIFs) from different starting materials is discussed. Using X-ray total scattering, N2 sorption analysis, and gas pycnometry, these frameworks are indistinguishable from one another and from temperature-amorphized ZIFs. Gas sorption analysis also confirms that they are nonporous once formed, in contrast to activated ZIF-4, which displays interesting gate-opening behavior. Nanoparticles of a prototypical nanoporous substituted ZIF, ZIF-8, were also prepared and shown to undergo amorphization.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{kerr2011effect,

title = {Effect of filament aspect ratio on the dielectric response of multiwalled carbon nanotube composites},

author = {CJ Kerr, Yan Yan Shery Huang, JE Marshall and Eugene M Terentjev},

url = {https://aip.scitation.org/doi/abs/10.1063/1.3569596},

year  = {2011},

date = {2011-01-01},

journal = {Journal of Applied Physics},

volume = {109},

number = {9},

pages = {094109},

publisher = {American Institute of Physics},

abstract = {Subpercolated composites consisting of highly polar fillers in an insulating matrix have long been predicted to exhibit a large dielectric constant. In this study, we examine the feasibility of experimentally reproducing such an effect based on a multiwalled carbon nanotubes (MWNTs)-polydimethylsiloxane (PDMS) composite system. MWNTs of different diameters were subjected to high-power ultrasound. The sonication-induced scission of nanotubes shows saturation at a final length dependent on the tube diameter, in agreement with a theoretical model. Sonication allows us to produce MWNTs with a prescribed mean aspect ratio between 10 and 55. Composites were formed from these MWNTs with PDMS elastomer at a fixed 1 wt% doping level, using a common solution-processing method. Results from AC impedance spectroscopy indicate that the tube length minimally affects the dielectric response of these composites when the doping level is below the percolation threshold.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{beldon2010rapid,

title = {Rapid room-temperature synthesis of zeolitic imidazolate frameworks by using mechanochemistry},

author = {Patrick J Beldon and László Fábián and Robin S Stein and A Thirumurugan and Anthony K Cheetham and Tomislav Friš{č}i{'c}},

url = {https://onlinelibrary.wiley.com/doi/abs/10.1002/ange.201005547},

year  = {2010},

date = {2010-01-01},

journal = {Angewandte Chemie},

volume = {122},

number = {50},

pages = {9834--9837},

publisher = {WILEY-VCH Verlag Weinheim},

keywords = {},

pubstate = {published},

tppubtype = {article}

}