A novel Pt@ZnO nanorod/carbon fiber(NR/CF) with hierarchical structure was prepared by atomic layer deposition combined with hydrothermal synthesis and magnetron sputtering(MS). The morphology of Pt changes from nanop...A novel Pt@ZnO nanorod/carbon fiber(NR/CF) with hierarchical structure was prepared by atomic layer deposition combined with hydrothermal synthesis and magnetron sputtering(MS). The morphology of Pt changes from nanoparticle to nanorod bundle with controlled thickness of Pt between 10 and 50 nm.Significantly, with the increase of voltage from 0 to 0.6 V(vs. standard calomel electrode), the prompt photocurrent generated on Zn O NR/CF increases from 0.235 to 0.725 m A. Besides, the Pt@Zn O NR/CF exhibited higher electrochemical active surface area(ECSA) value, better methanol oxidation ability and CO tolerance than Pt@CF, which demonstrated the importance of the multifunctional Zn O support. As the thickness of Pt increasing from 10 to 50 nm, the ECSA values were improved proportionally, leading to the improvement of methanol oxidation ability. More importantly, UV radiation increased the density of peak current of Pt@Zn O NR/CF towards methanol oxidation by additional 42.4%, which may be due to the synergy catalysis of UV light and electricity.展开更多
High resistance thin film chip resistors(0603 type) were studied,and the specifications are as follows:1 k? with tolerance about ±0.1% after laser trimming and temperature coefficient of resistance(TCR) less than...High resistance thin film chip resistors(0603 type) were studied,and the specifications are as follows:1 k? with tolerance about ±0.1% after laser trimming and temperature coefficient of resistance(TCR) less than ±15×10-6/℃.Cr-Si-Ta-Al films were prepared with Ar flow rate and sputtering power fixed at 20 standard-state cubic centimeter per minute(sccm) and 100 W,respectively.The experiment shows that the electrical properties of Cr-SiTa-Al deposition films can meet the specification requirements of 0603 type thin film chip resistors when the deposition time was about 11 min and deposition films were annealed at 500 ℃ for 120 min.The morphologies of Cr-Si-TaAl film surfaces were examined by scanning electron microscopy(SEM).The analysis suggests that Ta and Al may be distributed in CrSi2 film with mixed form of several structures(e.g.,bridge-like,capillary-like or island-like structures),and such a structure distribution is responsible for high film resistance and low TCR of Cr-Si-Ta-Al film.展开更多
杰西·斯图尔特(Jesse stuart 1907—)是美国肯塔基地方文学的著名作家,他出生于肯塔基州的群山之中;幼年求学极为困难.因为地处偏远山区,教师不好招聘,学校经常停课;除外,年幼的杰西还必须经常帮父亲在农场上干活,尽管如此,他还是...杰西·斯图尔特(Jesse stuart 1907—)是美国肯塔基地方文学的著名作家,他出生于肯塔基州的群山之中;幼年求学极为困难.因为地处偏远山区,教师不好招聘,学校经常停课;除外,年幼的杰西还必须经常帮父亲在农场上干活,尽管如此,他还是坚持不懈地学习,因为他深深地热爱着肯塔基群山及山里的居民.从孩提时代起、他就决心将来用自己学来的知识为生育他、养育他的故乡服务.所以,他大学一毕业,就立即返回家乡从事教育和写作工作.他的作品大部分是乡土文学,有诗歌、短篇小说和长篇小说,数目达几十篇之多.其作品就象山里人那样朴实,象群山那样美丽,象恋人那样深情.细读他的作品犹如喝了一杯清茶,喝了一杯美酒,令人神旷神怡,获得一次精神享受.下面,我们不妨以《空中开垦地》(Clearing in theSky)一文为例,浅析其写作手法来享受一番.展开更多
基金Supported by the National Key R&D Program(2016YFC0204000)the National Natural Science Foundation of China(U1510202)+1 种基金the Jiangsu Province Scientific Supporting Project(BK20170046and BE2015023)
文摘A novel Pt@ZnO nanorod/carbon fiber(NR/CF) with hierarchical structure was prepared by atomic layer deposition combined with hydrothermal synthesis and magnetron sputtering(MS). The morphology of Pt changes from nanoparticle to nanorod bundle with controlled thickness of Pt between 10 and 50 nm.Significantly, with the increase of voltage from 0 to 0.6 V(vs. standard calomel electrode), the prompt photocurrent generated on Zn O NR/CF increases from 0.235 to 0.725 m A. Besides, the Pt@Zn O NR/CF exhibited higher electrochemical active surface area(ECSA) value, better methanol oxidation ability and CO tolerance than Pt@CF, which demonstrated the importance of the multifunctional Zn O support. As the thickness of Pt increasing from 10 to 50 nm, the ECSA values were improved proportionally, leading to the improvement of methanol oxidation ability. More importantly, UV radiation increased the density of peak current of Pt@Zn O NR/CF towards methanol oxidation by additional 42.4%, which may be due to the synergy catalysis of UV light and electricity.
基金Supported by Science and Technology Committee of Tianjin (No.06YFGPGX08400)Ministry of Science and Technology of China (No.2009GJF20022)Innovation Fund of Tianjin University
文摘High resistance thin film chip resistors(0603 type) were studied,and the specifications are as follows:1 k? with tolerance about ±0.1% after laser trimming and temperature coefficient of resistance(TCR) less than ±15×10-6/℃.Cr-Si-Ta-Al films were prepared with Ar flow rate and sputtering power fixed at 20 standard-state cubic centimeter per minute(sccm) and 100 W,respectively.The experiment shows that the electrical properties of Cr-SiTa-Al deposition films can meet the specification requirements of 0603 type thin film chip resistors when the deposition time was about 11 min and deposition films were annealed at 500 ℃ for 120 min.The morphologies of Cr-Si-TaAl film surfaces were examined by scanning electron microscopy(SEM).The analysis suggests that Ta and Al may be distributed in CrSi2 film with mixed form of several structures(e.g.,bridge-like,capillary-like or island-like structures),and such a structure distribution is responsible for high film resistance and low TCR of Cr-Si-Ta-Al film.
文摘杰西·斯图尔特(Jesse stuart 1907—)是美国肯塔基地方文学的著名作家,他出生于肯塔基州的群山之中;幼年求学极为困难.因为地处偏远山区,教师不好招聘,学校经常停课;除外,年幼的杰西还必须经常帮父亲在农场上干活,尽管如此,他还是坚持不懈地学习,因为他深深地热爱着肯塔基群山及山里的居民.从孩提时代起、他就决心将来用自己学来的知识为生育他、养育他的故乡服务.所以,他大学一毕业,就立即返回家乡从事教育和写作工作.他的作品大部分是乡土文学,有诗歌、短篇小说和长篇小说,数目达几十篇之多.其作品就象山里人那样朴实,象群山那样美丽,象恋人那样深情.细读他的作品犹如喝了一杯清茶,喝了一杯美酒,令人神旷神怡,获得一次精神享受.下面,我们不妨以《空中开垦地》(Clearing in theSky)一文为例,浅析其写作手法来享受一番.
