The metal-free synthesis of graphene on singlecrystal silicon substrates, the most common commercial semiconductor, is of paramount significance for many technological applications. In this work, we report the growth ...The metal-free synthesis of graphene on singlecrystal silicon substrates, the most common commercial semiconductor, is of paramount significance for many technological applications. In this work, we report the growth of graphene directly on an upside-down placed,single-crystal silicon substrate using metal-free, ambientpressure chemical vapor deposition. By controlling the growth temperature, in-plane propagation, edge-propagation, and core-propagation, the process of graphene growth on silicon can be identified. This process produces atomically flat monolayer or bilayer graphene domains, concave bilayer graphene domains, and bulging few-layer graphene domains. This work would be a significant step toward the synthesis of large-area and layer-controlled, high-quality graphene on single-crystal silicon substrates.展开更多
We demonstrate a highly compact third-order elliptical micro-ring add-drop filter based on a silicon-on-insulator wafer. The elliptical micro-ring resonator has a major radius of 6μm （minor radius of 4.112μm） and ...We demonstrate a highly compact third-order elliptical micro-ring add-drop filter based on a silicon-on-insulator wafer. The elliptical micro-ring resonator has a major radius of 6μm （minor radius of 4.112μm） and a large free spectral range of 18 nm. Experimental results show a box-like channel dropping response, which has a 3 dB bandwidth of -2.7nm, high out-of-band signal rejection of around 40dB and a very low drop loss （〈0.5dB）. Simulation agrees well with the experiments. The footprint of the whole chip is only 0.0003mm2.展开更多
The manufacturing techniques of a Cr-free coat for non-oriented silicon steel sheets with excellent magnetic properties were developed. The ingredients of the coat mainly include phosphate, epoxy resin, an amine solid...The manufacturing techniques of a Cr-free coat for non-oriented silicon steel sheets with excellent magnetic properties were developed. The ingredients of the coat mainly include phosphate, epoxy resin, an amine solidified agent and water. Through the adjustment of ingredients, superior adhesiveness, corrosion-resistance performance, welding performance and stamping preformance have been obtained. Thus ,the non-oriented silicon steel sheets with the above Cr-free coat have been used successfully in the fields of compressors ,transformers, and small and medium motors.展开更多
Baosteel＇ s Cr-free ultrathick J coat for non-oriented silicon steel sheets has excellent insulation performance and has been successfully applied to middle and large scale electric power trains and wind electric pow...Baosteel＇ s Cr-free ultrathick J coat for non-oriented silicon steel sheets has excellent insulation performance and has been successfully applied to middle and large scale electric power trains and wind electric power devices, which have stricter requirements than typical for coat insulation. In this paper, the characteristics and application of this type of coating for non-oriented silicon steel sheets were described in detail.展开更多
For large diarneter silicon single crystal, the solid-liquid growth interface is necessary to be a coneaveshape with a certain radius range. If the change of the radius of growth interface is not in this limited range...For large diarneter silicon single crystal, the solid-liquid growth interface is necessary to be a coneaveshape with a certain radius range. If the change of the radius of growth interface is not in this limited range,the growth of DF (dislocation free) sinsle crystal is very difficult. The growth of FZ-Si single crystal was stud-ied. It is found that the growth speed ( 2. 5～2. 7 mm/min) as well as the rotation speed (3. 5 r/min) for theΦ100 mm crystal can be smaller . comparing with the Φ76. 2 mm crystal with the same coil. In order to satisfythe demand of large diameter crystal . the size of coil should be large enough, and the shape should satisfy theneed of the growth interface of crystal. With the increasing of diameter , the heating power , the anode voltageand the strength of electric field within the coil should be increased, and Ar pressure in surrounding circum-stance should also be higher , from 1. 96 × 1 0￣4 Pa to 4. 90 × 10￣4 Pa.According to the above growth factors, three rods of Φ100 mm FZ-Si single crystal were grown success-fully , the weights are 8～10 kg. When the diameter of crystal cone is increased to a limited size, “remeltingarca” will occur in the surface of the crystal , which cause a failure of growing DF crystal , this reason may bethat the recrystalliztion direction has been chansed , as it does.展开更多
To study the effects of different proportions of aluminum hydroxide and expandable graphite （EG） composites on flame retardation, sealing, mechanical, electrical and other properties of RTV- 1, aluminum hydroxide/ex...To study the effects of different proportions of aluminum hydroxide and expandable graphite （EG） composites on flame retardation, sealing, mechanical, electrical and other properties of RTV- 1, aluminum hydroxide/expandable graphite （ATH/EG） and silicone rubber composites were prepared by the compression molding method. The experimental results show that heat resistance improves with the increase of proportion of EG. Although the resistance coefficient changes, the composite materials still keep good electrical insulating property. Moreover, oxygen index and expansion index rise first then fall. When ATH/EG is 1：1, the oxygen index reaches the highest; the mechanical property of the silicone rubber is not affected under various environments such as acid, alkali, oily, artificial sea water environments, etc.展开更多
Iron-ore-imbedded silicone rubber materials were produced for radiation shielding. Samples were tested against a Co-60 gamma source, which is widely used in nuclear technology and medicine. Decreasing the particle siz...Iron-ore-imbedded silicone rubber materials were produced for radiation shielding. Samples were tested against a Co-60 gamma source, which is widely used in nuclear technology and medicine. Decreasing the particle size of iron ore resulted in better gamma radiation protection owing to more homogenous distribution. In addition, the materials had flexible properties up to the addition of 60 wt% iron ore content. Further, 0.5 mm Pb E gamma protection was provided by using 2.06-mm-thick SDT-60 as the Co-60 source. Iron ore–silicone rubber composites are candidate materials for lead-free flexible radiation protection systems owing to their relatively inexpensive and easy production.展开更多
基金financially supported by the National Natural Science Foundation of China (NSFC) (Grant Nos. 11405253, 11225527, 11575283, 11205235, U1632129, U1332205)Shanghai Science Foundation (14YF1407500)the Youth Innovation Promotion Association CAS (2016237)
文摘The metal-free synthesis of graphene on singlecrystal silicon substrates, the most common commercial semiconductor, is of paramount significance for many technological applications. In this work, we report the growth of graphene directly on an upside-down placed,single-crystal silicon substrate using metal-free, ambientpressure chemical vapor deposition. By controlling the growth temperature, in-plane propagation, edge-propagation, and core-propagation, the process of graphene growth on silicon can be identified. This process produces atomically flat monolayer or bilayer graphene domains, concave bilayer graphene domains, and bulging few-layer graphene domains. This work would be a significant step toward the synthesis of large-area and layer-controlled, high-quality graphene on single-crystal silicon substrates.
基金Supported by the National High Technology Research and Development Program of China under Grant No 2015AA016904the National Key Research and Development Plan of China under Grant No 2016YFB0402502the National Natural Science Foundation of China under Grant No 61275065
文摘We demonstrate a highly compact third-order elliptical micro-ring add-drop filter based on a silicon-on-insulator wafer. The elliptical micro-ring resonator has a major radius of 6μm （minor radius of 4.112μm） and a large free spectral range of 18 nm. Experimental results show a box-like channel dropping response, which has a 3 dB bandwidth of -2.7nm, high out-of-band signal rejection of around 40dB and a very low drop loss （〈0.5dB）. Simulation agrees well with the experiments. The footprint of the whole chip is only 0.0003mm2.
文摘The manufacturing techniques of a Cr-free coat for non-oriented silicon steel sheets with excellent magnetic properties were developed. The ingredients of the coat mainly include phosphate, epoxy resin, an amine solidified agent and water. Through the adjustment of ingredients, superior adhesiveness, corrosion-resistance performance, welding performance and stamping preformance have been obtained. Thus ,the non-oriented silicon steel sheets with the above Cr-free coat have been used successfully in the fields of compressors ,transformers, and small and medium motors.
文摘Baosteel＇ s Cr-free ultrathick J coat for non-oriented silicon steel sheets has excellent insulation performance and has been successfully applied to middle and large scale electric power trains and wind electric power devices, which have stricter requirements than typical for coat insulation. In this paper, the characteristics and application of this type of coating for non-oriented silicon steel sheets were described in detail.
文摘For large diarneter silicon single crystal, the solid-liquid growth interface is necessary to be a coneaveshape with a certain radius range. If the change of the radius of growth interface is not in this limited range,the growth of DF (dislocation free) sinsle crystal is very difficult. The growth of FZ-Si single crystal was stud-ied. It is found that the growth speed ( 2. 5～2. 7 mm/min) as well as the rotation speed (3. 5 r/min) for theΦ100 mm crystal can be smaller . comparing with the Φ76. 2 mm crystal with the same coil. In order to satisfythe demand of large diameter crystal . the size of coil should be large enough, and the shape should satisfy theneed of the growth interface of crystal. With the increasing of diameter , the heating power , the anode voltageand the strength of electric field within the coil should be increased, and Ar pressure in surrounding circum-stance should also be higher , from 1. 96 × 1 0￣4 Pa to 4. 90 × 10￣4 Pa.According to the above growth factors, three rods of Φ100 mm FZ-Si single crystal were grown success-fully , the weights are 8～10 kg. When the diameter of crystal cone is increased to a limited size, “remeltingarca” will occur in the surface of the crystal , which cause a failure of growing DF crystal , this reason may bethat the recrystalliztion direction has been chansed , as it does.
文摘To study the effects of different proportions of aluminum hydroxide and expandable graphite （EG） composites on flame retardation, sealing, mechanical, electrical and other properties of RTV- 1, aluminum hydroxide/expandable graphite （ATH/EG） and silicone rubber composites were prepared by the compression molding method. The experimental results show that heat resistance improves with the increase of proportion of EG. Although the resistance coefficient changes, the composite materials still keep good electrical insulating property. Moreover, oxygen index and expansion index rise first then fall. When ATH/EG is 1：1, the oxygen index reaches the highest; the mechanical property of the silicone rubber is not affected under various environments such as acid, alkali, oily, artificial sea water environments, etc.
文摘Iron-ore-imbedded silicone rubber materials were produced for radiation shielding. Samples were tested against a Co-60 gamma source, which is widely used in nuclear technology and medicine. Decreasing the particle size of iron ore resulted in better gamma radiation protection owing to more homogenous distribution. In addition, the materials had flexible properties up to the addition of 60 wt% iron ore content. Further, 0.5 mm Pb E gamma protection was provided by using 2.06-mm-thick SDT-60 as the Co-60 source. Iron ore–silicone rubber composites are candidate materials for lead-free flexible radiation protection systems owing to their relatively inexpensive and easy production.
