At cathodic potential of bulk copper deposition in dilute Cu 2+ solution, tip was found to be able to induce local dissolution of copper by applying a rather positive tip potential, although meanwhile the copper was s...At cathodic potential of bulk copper deposition in dilute Cu 2+ solution, tip was found to be able to induce local dissolution of copper by applying a rather positive tip potential, although meanwhile the copper was still deposited on the surface far from the tip area. The more positive the tip potential or the electrode potential is, the faster induced dissolution rate is. At a rather negative tip potential, deposition of Cu was enhanced by the tip while in the case Cu was dissolved locally with a more positive tip potential. A mechanism based on overlap of double layers between tip and substrate was proposed.展开更多
利用聚苯乙烯(polystyrene, PS)纳米球刻蚀结合水热生长的方法,制备周期有序δ-MnO_(2)纳米阵列。利用磁控溅射MnO_(2)靶材获得种子层,将PS纳米球通过自组装方法在MnO_(2)种子层上形成单层密堆积结构来制备图案化模板,再通过反应离子刻...利用聚苯乙烯(polystyrene, PS)纳米球刻蚀结合水热生长的方法,制备周期有序δ-MnO_(2)纳米阵列。利用磁控溅射MnO_(2)靶材获得种子层,将PS纳米球通过自组装方法在MnO_(2)种子层上形成单层密堆积结构来制备图案化模板,再通过反应离子刻蚀(reactive ion etching,RIE)减小PS纳米球的尺寸,并利用磁控溅射SiO_(2)靶材来覆盖PS纳米球间的间隙,去除衬底上的PS纳米球以得到周期有序的MnO_(2)种子位点,用于后续水热生长。通过选取不同尺寸的PS纳米球,制备周期分别为800和500 nm的有序纳米阵列,利用透射电子显微镜(transmission electron microscopy, TEM)对其进行表征,并确认阵列中MnO_(2)材料为δ相。研究结果为寻找低成本制备半导体材料有序纳米阵列提供了方法。展开更多
This paper covers the first application of Dip Pen Nanolithography(DPN) to directly write protein patterns with submicrometer dimensions onto Au substrate. Using Bovine Serum Albumin(BSA) as the ink in the DPN procedu...This paper covers the first application of Dip Pen Nanolithography(DPN) to directly write protein patterns with submicrometer dimensions onto Au substrate. Using Bovine Serum Albumin(BSA) as the ink in the DPN procedure, we were able to utilize lateral force microscopy(LFM) images to differentiate between Au substrate and patterned area with deposited monolayers of BSA. Then the first evidence for Au_S bonding was reported between the gold substrate and the BSA surface thiol groups given by the angle resolved XPS measurements.展开更多
基于原子力显微镜AFM(atomic force microscope)的纳米机械刻蚀加工是扫描探针刻蚀加工技术(scanning probe lithography,SPL)的一个重要组成,目前已取得较大进展。但由于纳米机械刻蚀涉及原子的结构与运动,其加工机理尚有待于进一步研...基于原子力显微镜AFM(atomic force microscope)的纳米机械刻蚀加工是扫描探针刻蚀加工技术(scanning probe lithography,SPL)的一个重要组成,目前已取得较大进展。但由于纳米机械刻蚀涉及原子的结构与运动,其加工机理尚有待于进一步研究。分子动力学模拟技术是近年来发展的继实验和理论研究后的又一重要研究方法。文章综述采用分子动力学模拟技术,研究基于AFM的纳米机械刻蚀加工的进展,分析纳米尺度的加工机理,评述探针、刻蚀工艺、工件材料等因素对纳米机械加工过程的影响。文章最后指出今后研究的方向。展开更多
We use 8 nm magnetite nanoparticles as "ink", self assembly monolayer(SAM) of bovine serum albumin(BSA) as "paper" to generate arbitrary structures at micro or nanometer scales in the DPN procedure...We use 8 nm magnetite nanoparticles as "ink", self assembly monolayer(SAM) of bovine serum albumin(BSA) as "paper" to generate arbitrary structures at micro or nanometer scales in the DPN procedure. AFM and LFM are used to image the patterns. The height profile of pattern is about 8 nm, which is consistent with the diameter of magnetite nanoparticles. It means that the magnetic monolayer pattern has been obtained. The SAM of BSA is measured by diffuse reflection IR spectra and the data is coincided with the one of the literature. After writing the magnetite "ink", the band of magnetite appears at 570 cm -1 , which gives a further proof.展开更多
文摘At cathodic potential of bulk copper deposition in dilute Cu 2+ solution, tip was found to be able to induce local dissolution of copper by applying a rather positive tip potential, although meanwhile the copper was still deposited on the surface far from the tip area. The more positive the tip potential or the electrode potential is, the faster induced dissolution rate is. At a rather negative tip potential, deposition of Cu was enhanced by the tip while in the case Cu was dissolved locally with a more positive tip potential. A mechanism based on overlap of double layers between tip and substrate was proposed.
文摘利用聚苯乙烯(polystyrene, PS)纳米球刻蚀结合水热生长的方法,制备周期有序δ-MnO_(2)纳米阵列。利用磁控溅射MnO_(2)靶材获得种子层,将PS纳米球通过自组装方法在MnO_(2)种子层上形成单层密堆积结构来制备图案化模板,再通过反应离子刻蚀(reactive ion etching,RIE)减小PS纳米球的尺寸,并利用磁控溅射SiO_(2)靶材来覆盖PS纳米球间的间隙,去除衬底上的PS纳米球以得到周期有序的MnO_(2)种子位点,用于后续水热生长。通过选取不同尺寸的PS纳米球,制备周期分别为800和500 nm的有序纳米阵列,利用透射电子显微镜(transmission electron microscopy, TEM)对其进行表征,并确认阵列中MnO_(2)材料为δ相。研究结果为寻找低成本制备半导体材料有序纳米阵列提供了方法。
文摘This paper covers the first application of Dip Pen Nanolithography(DPN) to directly write protein patterns with submicrometer dimensions onto Au substrate. Using Bovine Serum Albumin(BSA) as the ink in the DPN procedure, we were able to utilize lateral force microscopy(LFM) images to differentiate between Au substrate and patterned area with deposited monolayers of BSA. Then the first evidence for Au_S bonding was reported between the gold substrate and the BSA surface thiol groups given by the angle resolved XPS measurements.
文摘基于原子力显微镜AFM(atomic force microscope)的纳米机械刻蚀加工是扫描探针刻蚀加工技术(scanning probe lithography,SPL)的一个重要组成,目前已取得较大进展。但由于纳米机械刻蚀涉及原子的结构与运动,其加工机理尚有待于进一步研究。分子动力学模拟技术是近年来发展的继实验和理论研究后的又一重要研究方法。文章综述采用分子动力学模拟技术,研究基于AFM的纳米机械刻蚀加工的进展,分析纳米尺度的加工机理,评述探针、刻蚀工艺、工件材料等因素对纳米机械加工过程的影响。文章最后指出今后研究的方向。
基金supported by National Institute of General Medical Sciences of the National Institutes of Health,USA(P20GM103436)National Science Foundation,USA(3048111570-15-153)~~
文摘We use 8 nm magnetite nanoparticles as "ink", self assembly monolayer(SAM) of bovine serum albumin(BSA) as "paper" to generate arbitrary structures at micro or nanometer scales in the DPN procedure. AFM and LFM are used to image the patterns. The height profile of pattern is about 8 nm, which is consistent with the diameter of magnetite nanoparticles. It means that the magnetic monolayer pattern has been obtained. The SAM of BSA is measured by diffuse reflection IR spectra and the data is coincided with the one of the literature. After writing the magnetite "ink", the band of magnetite appears at 570 cm -1 , which gives a further proof.
