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排序方式: 共有62条查询结果,搜索用时 31 毫秒
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Layered Black Phosphorus: Strongly Anisotropic Magnetic,Electronic, and Electron‐Transfer Properties
Zdenk Sofer David Sedmidubský tpn Huber Jan Luxa Daniel Boua Chris Boothroyd Martin Pumera 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2016,128(10):3443-3447
Layered elemental materials, such as black phosphorus, exhibit unique properties originating from their highly anisotropic layered structure. The results presented herein demonstrate an anomalous anisotropy for the electrical, magnetic, and electrochemical properties of black phosphorus. It is shown that heterogeneous electron transfer from black phosphorus to outer‐ and inner‐sphere molecular probes is highly anisotropic. The electron‐transfer rates differ at the basal and edge planes. These unusual properties were interpreted by means of calculations, manifesting the metallic character of the edge planes as compared to the semiconducting properties of the basal plane. This indicates that black phosphorus belongs to a group of materials known as topological insulators. Consequently, these effects render the magnetic properties highly anisotropic, as both diamagnetic and paramagnetic behavior can be observed depending on the orientation in the magnetic field. 相似文献
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Bas B. Van Aken Martial Duchamp Chris B. Boothroyd Rafal E. Dunin-Borkowski Wim J. Soppe 《Journal of Non》2012,358(17):2179-2182
The p-type Si layer in a-Si and μc-Si solar cells on foil needs to fulfil several important requirements. The layer is necessary to create the electric field that separates the photo-generated charge carriers; the doping also increases the conductivity to conduct the photocurrent to the front contact; on the other hand, the p-layer should transmit the incident light efficiently to the intrinsic absorber layer. We show that it is possible to study TEM samples prepared, for analysis of possible layer defects, by focussed ion beam milling to detect boron and carbon concentrations as low as 1020 cm-3, using core-loss EELS combined with numerical analysis. We control the band gap and activation energy of p-a-SiC by varying the B2H6 and CH4 flow during deposition in the process chamber. We have found a linear relation between the activation energy of the dark conductivity Eact and the optical band gap E04. Modelling shows that the optimum efficiency in nip solar cells is obtained when the p-a-SiC band gap is slightly larger than the band gap of the absorber layer. We have assessed the potential of core-loss EELS for detecting B and C concentrations as low as 1020 cm-3 in a spatially resolved manner, and of low-loss EELS as a probe of the local variations in plasmon energy. 相似文献
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The acoustic change complex (ACC) is a scalp-recorded negative-positive voltage swing elicited by a change during an otherwise steady-state sound. The ACC was obtained from eight adults in response to changes of amplitude and/or spectral envelope at the temporal center of a three-formant synthetic vowel lasting 800 ms. In the absence of spectral change, the group mean waveforms showed a clear ACC to amplitude increments of 2 dB or more and decrements of 3 dB or more. In the presence of a change of second formant frequency (from perceived /u/ to perceived /i/), amplitude increments increased the magnitude of the ACC but amplitude decrements had little or no effect. The fact that the just detectable amplitude change is close to the psychoacoustic limits of the auditory system augurs well for the clinical application of the ACC. The failure to find a condition under which the spectrally elicited ACC is diminished by a small change of amplitude supports the conclusion that the observed ACC to a change of spectral envelope reflects some aspect of cortical frequency coding. Taken together, these findings support the potential value of the ACC as an objective index of auditory discrimination capacity. 相似文献
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Ehrke H Tobey RI Wall S Cavill SA Först M Khanna V Garl T Stojanovic N Prabhakaran D Boothroyd AT Gensch M Mirone A Reutler P Revcolevschi A Dhesi SS Cavalleri A 《Physical review letters》2011,106(21):217401
We used ultrafast resonant soft x-ray diffraction to probe the picosecond dynamics of spin and orbital order in La(0.5)Sr(1.5)MnO(4) after photoexcitation with a femtosecond pulse of 1.5 eV radiation. Complete melting of antiferromagnetic spin order is evidenced by the disappearance of a (1/4,1/4,1/2) diffraction peak. On the other hand, the (1/4,1/4,0) diffraction peak, reflecting orbital order, is only partially reduced. We interpret the results as evidence of destabilization in the short-range exchange pattern with no significant relaxation of the long-range Jahn-Teller distortions. Cluster calculations are used to analyze different possible magnetically ordered states in the long-lived metastable phase. Nonthermal coupling between light and magnetism emerges as a primary aspect of photoinduced phase transitions in manganites. 相似文献
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Quan Chen Chris Boothroyd Andrew Mcintosh Soutar Xian Ting Zeng 《Journal of Sol-Gel Science and Technology》2010,53(1):115-120
The surface of commercial titania particles was coated by a layer of silica by a two-step process which involved a power ultrasound
initiated sol–gel reaction. In the first step of this solution process, aminosilane, i.e. organosilane with amino functional
group, was used to modify the surface of pristine nanoparticles. Subsequent silica nanocoating was initiated and sustained
under power ultrasound agitation in a mixture of surface modified particles and epoxysilane. As a result, a homogenous coverage
of silica on the nanoparticles’ surface, with thickness controllable from one to several nanometers, was obtained. Fourier
transform infrared spectroscopy (FTIR), high-resolution transmission electron microscopy (HRTEM), X-ray photoelectron spectroscopy
(XPS), and particle surface zeta potential measurements were employed to follow steps in the process and to confirm the reaction
mechanism. 相似文献
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Monodispersed Ag2Se nanocubes and faceted nanocrystals have been synthesized by hexadecylamine (HDA) induced thermolysis of [(PPh3)3Ag2(SeC{O}Ph)2] in a mixture of TOP (tri-n-octyl phosphine) and HDA in the temperature range 95-180 degrees C. 相似文献
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