The Experts below are selected from a list of 52515 Experts worldwide ranked by ideXlab platform
Lu Wang - One of the best experts on this subject based on the ideXlab platform.
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Interfacial Structure and stability of a co continuous sic al composite prepared by vacuum pressure infiltration
Ceramics International, 2017Co-Authors: Fuchi Wang, Yangwei Wang, Bowen Zhang, Lu WangAbstract:Abstract The Interfacial Structure of a SiC 3D /Al composite prepared by vacuum-pressure infiltration was investigated to determine whether Interfacial reactions occur and specific orientation relationships exist between SiC and Al. The resulting SiC/Al interfaces were continuous and free of any precipitates and voids. There is no consensus for the orientation relationship between 6H-SiC and Al. In addition, the mismatch between the two phases at the interface was accommodated by mismatch dislocation. The stability of the SiC 3D /Al composite after annealing at 873 K for 10 h was determined. No Al 4 C 3 precipitated at the interface, although grain coarsening of Al occurred. Compared with the concentration gradients at the initial interfaces, those obtained at the interface after annealing were still steep, indicating that concurrent interdiffusion occurred between SiC and Al in a very narrow region near the interfaces. Theoretical calculations suggest similarly the chemical and structural stability of the SiC/Al interface during the annealing treatment.
Yong Qing Fu - One of the best experts on this subject based on the ideXlab platform.
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xps characterization of surface and Interfacial Structure of sputtered tini films on si substrate
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2005Co-Authors: Yong Qing Fu, Hejun Du, Sam Zhang, W M HuangAbstract:TiNi films were prepared by co-sputtering TiNi and Ti targets. X-ray photoelectron spectroscopy (XPS) was employed to study surface chemistry of the films and Interfacial Structure of Si/TiNi system. Exposure of the TiNi film to the ambient atmosphere (23 °C and 80% relatively humidity) facilitated quick adsorption of oxygen and carbon on the surface. With time, carbon and oxygen content increased drastically at the surface, while oxygen diffused further into the layer. After a year, carbon content at the surface became as high as 65.57% and Ni dropped below the detection limit of XPS. Depth profiling revealed that significant inter-diffusion occurred between TiNi film and Si substrate with a layer of 90–100 nm. The detailed bond changes of different elements with depth were obtained using XPS and the formation of titanium silicides at the interface were identified.
M Zavelanirossi - One of the best experts on this subject based on the ideXlab platform.
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engineering Interfacial Structure in giant pbs cds quantum dots for photoelectrochemical solar energy conversion
Nano Energy, 2016Co-Authors: Gianluca Sirigu, Andrea Camellini, Andrea Parisini, Giuseppe Nicotra, C Spinella, Haiguang Zhao, Vittorio Morandi, Xin Tong, M ZavelanirossiAbstract:Abstract The Interfacial Structure in “giant” PbS/CdS quantum dots (QDs) was engineered by modulating the Cd:S molar ratio during in situ growth. The control of the gradient Interfacial layer could facilitate hole transfer, regulate the transition from double- to single-color emission, as a consequence. These QDs are optically active close-to-the near-infrared (NIR) spectral region and are candidates as absorber materials in solar energy conversion. Photoinduced charge transfer from “giant” QDs to electron scavenger can still take place despite the ultra-thick (~5 nm) shell. The hybrid architecture based on a TiO 2 mesoporous framework sensitized by the “giant” QDs with alloyed interface can produce a saturated photocurrent density as high as ~5.3 mA/cm 2 in a photoelectrochemical (PEC) cell under 1 Sun illumination, which is around 2 times higher than that of bare PbS and core/thin-shell PbS/CdS QDs sensitizer. The as-prepared PEC device presented very good stability thanks to the “giant” core/shell QDs architecture with tailored Interfacial layer and a further coating of the ZnS shell. 78% of the initial current density is kept after 2-h irradiation at 1 Sun. Engineering of electronic band Structure plays a key role in boosting the functional properties of these composite systems, which hold great potential for H 2 production in PEC devices.
Xin Tong - One of the best experts on this subject based on the ideXlab platform.
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engineering Interfacial Structure in giant pbs cds quantum dots for photoelectrochemical solar energy conversion
Nano Energy, 2016Co-Authors: Gianluca Sirigu, Andrea Camellini, Andrea Parisini, Giuseppe Nicotra, C Spinella, Haiguang Zhao, Vittorio Morandi, Xin Tong, M ZavelanirossiAbstract:Abstract The Interfacial Structure in “giant” PbS/CdS quantum dots (QDs) was engineered by modulating the Cd:S molar ratio during in situ growth. The control of the gradient Interfacial layer could facilitate hole transfer, regulate the transition from double- to single-color emission, as a consequence. These QDs are optically active close-to-the near-infrared (NIR) spectral region and are candidates as absorber materials in solar energy conversion. Photoinduced charge transfer from “giant” QDs to electron scavenger can still take place despite the ultra-thick (~5 nm) shell. The hybrid architecture based on a TiO 2 mesoporous framework sensitized by the “giant” QDs with alloyed interface can produce a saturated photocurrent density as high as ~5.3 mA/cm 2 in a photoelectrochemical (PEC) cell under 1 Sun illumination, which is around 2 times higher than that of bare PbS and core/thin-shell PbS/CdS QDs sensitizer. The as-prepared PEC device presented very good stability thanks to the “giant” core/shell QDs architecture with tailored Interfacial layer and a further coating of the ZnS shell. 78% of the initial current density is kept after 2-h irradiation at 1 Sun. Engineering of electronic band Structure plays a key role in boosting the functional properties of these composite systems, which hold great potential for H 2 production in PEC devices.
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Engineering Interfacial Structure in “Giant” PbS/CdS quantum dots for photoelectrochemical solar energy conversion
Nano Energy, 2016Co-Authors: Lei Jin, Gianluca Sirigu, Andrea Camellini, Andrea Parisini, Giuseppe Nicotra, C Spinella, Haiguang Zhao, Xin Tong, Shuhui Sun, Vittorio MorandiAbstract:The Interfacial Structure in “giant” PbS/CdS quantum dots (QDs) was engineered by modulating the Cd:S molar ratio during in situ growth. The control of the gradient Interfacial layer could facilita ...
Tianquan Lian - One of the best experts on this subject based on the ideXlab platform.
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Interfacial Structure and electric field probed by in situ electrochemical vibrational stark effect spectroscopy and computational modeling
Journal of Physical Chemistry C, 2017Co-Authors: Aimin Ge, Pablo E Videla, Benjamin Rudshteyn, Jia Song, Clifford P Kubiak, Victor S Batista, Tianquan LianAbstract:Interfacial electric fields play crucial roles in electrochemistry, catalysis, and solar energy conversion. Understanding of the Interfacial electric field effects has been hindered by the lack of a direct spectroscopic method to probe of the Interfacial field at the molecular level. Here, we report the characterization of the field and Interfacial Structure at Au/diisocyanide/aqueous electrolyte interfaces, using a combination of in situ electrochemical vibrational sum frequency generation (SFG) spectroscopy, density functional theory (DFT) calculations, and molecular dynamics (MD) simulations. For 1,4-phenylene diisocyanide (PDI), 4,4′-biphenyl diisocyanide (BPDI), and 4,4″-p-terphenyl diisocyanide (TPDI), our results reveal that the frequency of the gold-bound NC stretch mode of the diisocyanide self-assembled monolayer (SAM) increases linearly with the applied potential, suggesting that SFG can be an in situ probe of the strength of the electric field at electrode/electrolyte interfaces. Using DFT-com...