ORCID Profile
0000-0002-0050-2858
Current Organisations
UNSW Sydney
,
University of Technology Sydney
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Publisher: Springer Science and Business Media LLC
Date: 22-06-2020
Publisher: Springer Science and Business Media LLC
Date: 24-11-2011
DOI: 10.1557/JMR.2011.377
Publisher: American Chemical Society (ACS)
Date: 05-04-2017
Publisher: Springer Science and Business Media LLC
Date: 21-02-2007
Publisher: American Chemical Society (ACS)
Date: 04-10-2016
Publisher: Springer Science and Business Media LLC
Date: 10-06-2011
Publisher: Springer Science and Business Media LLC
Date: 26-08-2011
Publisher: Oxford University Press (OUP)
Date: 07-2012
DOI: 10.1017/S1431927612011233
Abstract: Extended abstract of a paper presented at Microscopy and Microanalysis 2012 in Phoenix, Arizona, USA, July 29 – August 2, 2012.
Publisher: Hindawi Limited
Date: 2010
DOI: 10.1155/2010/490719
Abstract: Over the last decade, surgeons have witnessed dramatic changes in surgical practice as a result of the introduction of new technological advancement. Some of these changes include refinement of techniques in thyroid cancer surgery. The development of various endoscopic thyroidectomy techniques, the addition of the da Vinci robot, and the use of operative adjuncts in thyroid surgery, such as intraoperative neuromonitoring and quick intraoperative parathyroid hormone, have made thyroid cancer surgery not only safer and better accepted by patients with thyroid cancer but also offer them more surgical treatment options.
Publisher: Elsevier BV
Date: 02-2007
Publisher: Elsevier BV
Date: 12-2018
Publisher: Bioscientifica
Date: 03-2007
DOI: 10.1677/ERC.1.01284
Abstract: A number of risk-group stratification or staging systems have been found useful at stratifying patients with differentiated thyroid carcinoma into risk groups. Those identified as high risk could be subjected to more aggressive treatment, while those at low risk could be spared of such treatment. However, the best stratification system in patients with follicular thyroid carcinoma (FTC) remains unclear. Through a comprehensive MEDLINE search from 1965 to 2005, a total of 18 different staging systems were identified in the literature and 14 of them were applicable to 171 patients, with FTC managed at our institution from 1961 to 2001. Cancer-specific survivals (CSS) were calculated by Kaplan–Meier method and were compared by log-rank test. Using Cox proportional hazards analysis, the relative importance of each staging system in determining CSS was calculated by the proportion of variation in survival time explained (PVE). CSS were predicted by 13 out of the 14 staging systems significantly ( P 0.001). The three highest ranked staging systems by PVE were the new American Joint Commitee on Cancer/Union Internationale Centre le Cancer 6th edition, tumour, node, metastases (TNM 22.4), followed by the Clinical Class (21.2) and the metastases, age, completeness of resection, invasion, size (MACIS 20.4). In conclusion, 13 out of the 14 presently available staging systems predicted CSS significantly in FTC. When predictability was measured by PVE, the TNM system was found to have the best predictability and thus, should be the stratification system of choice for FTC in the future.
Publisher: American Chemical Society (ACS)
Date: 17-06-2019
Abstract: The challenges of making high-performance, low-temperature processed, p-type transparent conductors (TCs) have been the main bottleneck for the development of flexible transparent electronics. Though a few p-type transparent conducting oxides (TCOs) have shown promising results, they need high processing temperature to achieve the required conductivity which makes them unsuitable for organic and flexible electronic applications. Copper iodide is a wide band gap p-type semiconductor that can be heavily doped at low temperature (<100 °C) to achieve conductivity comparable or higher than many of the well-established p-type TCOs. However, as-processed CuI loses its transparency and conductivity with time in an ambient condition which makes them unsuitable for long-term applications. Herein, we propose CuI-TiO
Publisher: Springer Science and Business Media LLC
Date: 20-08-2011
Publisher: Ovid Technologies (Wolters Kluwer Health)
Date: 03-2007
Publisher: Springer Science and Business Media LLC
Date: 12-2016
Publisher: American Chemical Society (ACS)
Date: 17-09-2018
Publisher: Wiley
Date: 20-11-2019
Publisher: Ovid Technologies (Wolters Kluwer Health)
Date: 04-2007
Publisher: Elsevier BV
Date: 12-2016
Publisher: Royal Society of Chemistry (RSC)
Date: 2017
DOI: 10.1039/C7EE01096F
Abstract: Reducing interface recombination boosts the V oc for perovskite solar cells.
Publisher: Springer Science and Business Media LLC
Date: 17-04-2006
Publisher: Elsevier BV
Date: 12-2008
Publisher: Oxford University Press (OUP)
Date: 04-02-2009
DOI: 10.1093/JNCI/DJN471
Abstract: The genetic factors that determine the risk of papillary thyroid carcinoma (PTC) among patients with multinodular goiter (MNG) remain undefined. Because thyroid transcription factor-1 (TTF-1) is important to thyroid development, we evaluated whether the gene that encodes it, TITF-1/NKX2.1, is a genetic determinant of MNG/PTC predisposition. Twenty unrelated PTC patients with a history of MNG (MNG/PTC), 284 PTC patients without a history of MNG (PTC), and 349 healthy control subjects were screened for germline mutation(s) in TITF-1/NKX2.1 by sequencing of lified DNA from blood. The effects of the mutation on the growth and differentiation of thyroid cells were demonstrated by ectopic expression of wild-type (WT) and mutant proteins in PCCL3 normal rat thyroid cells, followed by tests of cell proliferation, activation of cell growth pathways, and transcription of TTF-1 target genes. All statistical tests were two-sided. A missense mutation (1016C>T) was identified in TITF-1/NKX2.1 that led to a mutant TTF-1 protein (A339V) in four of the 20 MNG/PTC patients (20%). These patients developed substantially more advanced tumors than MNG/PTC or PTC patients without the mutation (P = .022, Fisher exact test). Notably, this germline mutation was dominantly inherited in two families, with some members bearing the mutation affected with MNG, associated with either PTC or colon cancer. The mutation encoding the A339V substitution was not found among the 349 healthy control subjects nor among the 284 PTC patients who had no history of MNG. Overexpression of A339V TTF-1 in PCCL3 cells, as compared with overexpression of WT TTF-1, was associated with increased cell proliferation including thyrotropin-independent growth (average A339V proliferation rate = 134.27%, WT rate = 104.43%, difference = 34.3%, 95% confidence interval = 12.0% to 47.7%, P = .010), enhanced STAT3 activation, and impaired transcription of the thyroid-specific genes Tg, TSH-R, and Pax-8. This is the first germline mutation identified in MNG/PTC patients. It could contribute to predisposition for MNG and/or PTC and to the pathogenesis of PTC.
Publisher: Elsevier BV
Date: 04-2018
Publisher: American Chemical Society (ACS)
Date: 29-05-2019
DOI: 10.1021/ACS.NANOLETT.9B00959
Abstract: We report multiwavelength single InGaAs/InP quantum well nanowire light-emitting diodes grown by metal organic chemical vapor deposition using selective area epitaxy technique and reveal the complex origins of their electroluminescence properties. We observe that the single InGaAs/InP quantum well embedded in the nanowire consists of three components with different chemical compositions, axial quantum well, ring quantum well, and radial quantum well, leading to the electroluminescence emission with multiple wavelengths. The electroluminescence measurements show a strong dependence on current injection levels as well as temperatures and these are explained by interpreting the equivalent circuits in a minimized area of the device. It is also found that the electroluminescence properties are closely related to the distinctive triangular morphology with an inclined facet of the quantum well nanowire. Our study provides important new insights for further design, growth, and fabrication of high-performance quantum well-based nanowire light sources for a wide range of future optoelectronic and photonic applications.
Publisher: American Chemical Society (ACS)
Date: 10-06-2019
Abstract: Greater demand for III-V nanostructures with more sophisticated geometries other than nanowires is expected because of the recent intensive investigation of nanowire networks that show great potential in all-optical logic gates, nanoelectronics, and quantum computing. Here, we demonstrate highly uniform arrays of InP nanostructures with tunable shapes, such as membrane-, prism-, and ring-like shapes, which can be simultaneously grown by selective area epitaxy. Our in-depth investigation of shape evolution confirms that the shape is essentially determined by pattern confinement and the minimization of total surface energy. After growth optimization, all of the different InP nanostructures grown under the same growth conditions show perfect wurtzite structure regardless of the geometry and strong and homogeneous photon emission. This work expands the research field in terms of producing nanostructures with the desired shapes beyond the limits of nanowires to satisfy various requirements for nanoelectronics, optoelectronics, and quantum device applications.
Publisher: Wiley
Date: 04-12-2021
Abstract: Atomically thin transition metal dichalcogenide crystals (TMDCs) have extraordinary optical properties that make them attractive for future optoelectronic applications. Integration of TMDCs into practical all‐dielectric heterostructures hinges on the ability to passivate and protect them against necessary fabrication steps on large scales. Despite its limited scalability, encapsulation of TMDCs in hexagonal boron nitride (hBN) currently has no viable alternative for achieving high performance of the final device. Here, it is shown that the novel, ultrathin Ga 2 O 3 glass is an ideal centimeter‐scale coating material that enhances optical performance of the monolayers and protects them against further material deposition. In particular, Ga 2 O 3 capping of monolayer WS 2 outperforms commercial‐grade hBN in both scalability and optical performance at room temperature. These properties make Ga 2 O 3 highly suitable for large‐scale passivation and protection of monolayer TMDCs in functional heterostructures.
Publisher: Royal Society of Chemistry (RSC)
Date: 2019
DOI: 10.1039/C8NR09255A
Abstract: Cathodoluminescence imaging reveals that the bright green emission from the zero-dimensional perovskite Cs 4 PbBr 6 is due to nanoscale CsPbBr 3 impurities.
Publisher: American Chemical Society (ACS)
Date: 25-02-2020
Publisher: Springer Science and Business Media LLC
Date: 26-06-2008
Publisher: American Physical Society (APS)
Date: 06-07-2015
Publisher: American Chemical Society (ACS)
Date: 31-08-2017
Publisher: American Chemical Society (ACS)
Date: 08-2017
Abstract: Perovskite material with a bandgap of 1.7-1.8 eV is highly desirable for the top cell in a tandem configuration with a lower bandgap bottom cell, such as a silicon cell. This can be achieved by alloying iodide and bromide anions, but light-induced phase-segregation phenomena are often observed in perovskite films of this kind, with implications for solar cell efficiency. Here, we investigate light-induced phase segregation inside quadruple-cation perovskite material in a complete cell structure and find that the magnitude of this phenomenon is dependent on the operating condition of the solar cell. Under short-circuit and even maximum power point conditions, phase segregation is found to be negligible compared to the magnitude of segregation under open-circuit conditions. In accordance with the finding, perovskite cells based on quadruple-cation perovskite with 1.73 eV bandgap retain 94% of the original efficiency after 12 h operation at the maximum power point, while the cell only retains 82% of the original efficiency after 12 h operation at the open-circuit condition. This result highlights the need to have standard methods including light/dark and bias condition for testing the stability of perovskite solar cells. Additionally, phase segregation is observed when the cell was forward biased at 1.2 V in the dark, which indicates that photoexcitation is not required to induce phase segregation.
Publisher: Springer Science and Business Media LLC
Date: 11-11-2007
Publisher: Elsevier BV
Date: 12-2010
Publisher: Springer Science and Business Media LLC
Date: 17-04-2006
Publisher: Royal Society of Chemistry (RSC)
Date: 2018
DOI: 10.1039/C8NR00737C
Abstract: After nitridation, nanorods show better optical properties, while their polarity changes from mixed-to N-polarity.
Publisher: Elsevier BV
Date: 05-2020
Publisher: IEEE
Date: 12-2018
Publisher: American Chemical Society (ACS)
Date: 03-10-2018
Abstract: III-V semiconductor multi-quantum-well nanowires (MQW NWs) via selective-area epitaxy (SAE) is of great importance for the development of nanoscale light-emitting devices for applications such as optical communication, silicon photonics, and quantum computing. To achieve highly efficient light-emitting devices, not only the high-quality materials but also a deep understanding of their growth mechanisms and material properties (structural, optical, and electrical) are extremely critical. In particular, the three-dimensional growth mechanism of MQWs embedded in a NW structure by SAE is expected to be different from that of those grown in a planar structure or with a catalyst and has not yet been thoroughly investigated. In this work, we reveal a distinctive radial growth evolution of InGaAs/InP MQW NWs grown by the SAE metal organic vapor-phase epitaxy (MOVPE) technique. We observe the formation of zinc blende (ZB) QW discs induced by the axial InGaAs QW growth on the wurtzite (WZ) base-InP NW and propose it as the key factor driving the overall structure of radial growth. The role of the ZB-to-WZ change in the driving of the overall growth evolution is supported by a growth formalism, taking into account the formation-energy difference between different facets. Despite a polytypic crystal structure with mixed ZB and WZ phases across the MQW region, the NWs exhibit high uniformity and desirable QW spatial layout with bright room-temperature photoluminescence at an optical communication wavelength of ∼1.3 μm, which is promising for the future development of high-efficiency light-emitting devices.
Publisher: Wiley
Date: 09-09-2018
Publisher: Elsevier BV
Date: 09-2010
Publisher: Ovid Technologies (Wolters Kluwer Health)
Date: 07-2007
Publisher: Springer Science and Business Media LLC
Date: 31-12-2007
Publisher: Wiley
Date: 21-04-2011
Publisher: IOP Publishing
Date: 2011
Publisher: Royal Society of Chemistry (RSC)
Date: 2020
DOI: 10.1039/D0NH00410C
Abstract: Selective area epitaxy is a powerful growth technique to produce III–V semiconductor nanoshape arrays and heterostructures for photonic and electronic applications.
No related grants have been discovered for Mark Lockrey.