一种新型C60-硫醚衍生物分子在金表面上的自组装

报导了一种新型C60 硫醚分子在金表面上自组装膜的形成,并通过接触角、扫描隧道显微术（STM）、X射线光电子能谱（XPS）、电化学和光电化学手段对其进行表征.高分辩STM形貌图证明,在Au(111)基底上C60基团存在并直观显示出特殊的单层膜结构. XPS分析表明,这一新型C60 硫醚分子是通过金硫键固定在金表面上的,并且在组装过程中存在分子内碳硫键断裂步骤.     

Self-assembled parallel mesoscopic Pb-wires on Au-modified Si(5 3 3) substrates

Arrays of extremely long and perfectly parallel mesoscopic Pb-wires are formed and studied in UHV conditions. Au-modified Si(5 3 3) substrate modified by deposition of sub-monolayer amount of Au are used as templates. A uniform distribution of monoatomic steps and terraces on well-oriented Si(5 3 3) is induced by formation of Au-chains running along step edges. Real-time surface imaging with LEEM shows that the wires growing on substrates held at temperatures close to the room temperature are all aligned parallel to azimuth, along the step edges. After nucleation of elongated islands, the 1 ML thick wetting layer remains on the vicinal Si surface. RHEED and low-temperature STM experiments show that the wires have triangular cross-section, limited by (1 1 1) and (1 0 0) facets of Pb. The width of the wires is 60 nm, whereas their length is up to 8 μm. The observed growth anisotropy leading to the formation of mesoscopic wires is attributed to enhanced one-dimensional diffusion along the parallel grooves and trenches that form vicinal surfaces. An additional factor, contributing to the anisotropic growth, is probably the anisotropic strain, due to the large misfit between Pb and Si lattices.     

钙离子对支撑磷脂膜离子通道行为的诱导作用

将一种支撑磷脂膜--杂化双层膜(Hybridbilayermembrane,HBM)用于钙离子与磷脂作用的研究,以Fe(CN)₆^3-为探针,发现钙离子可诱导HBM产生离子通道,且通道的打开与关闭可反复运转,并用STM观察了这一现象.     

化学修饰针尖对STM成像及物种识别研究的进展

化学修饰的STM（扫描隧道显微镜：Scanning Tunneling Microscope)针尖可以改变STM图像的反差,影响STM成像,这一功能现已被发展用于成分及物种识别。本文简要介绍了与其相关研究的应用与进展。     

第一过渡金属酞菁分子的电子结构的第一性原理计算

对第一过渡金属酞菁化合物(Metal Phthalocyanine,MPc,M=Sc,Ti,V,Cr,Mn,Fe,Co,Ni和Cu)的电子结构和基本物理化学性质进行了第一性原理计算.理论模拟出来的STM图像表现出亚分子结构,与已有的实验观察结果相当吻合,且跟金属原子的d电子组态明显有关.在小偏压条件下,第一过渡金属首尾端ScPc,NiPc和CuPc分子的中央金属离子在STM图像表现为空洞,其他所有金属酞菁分子的中央金属离子均为亮斑.同时还研究了ScPc和NiPc分子的STM图像与偏压的关系,当针尖偏压分别 关键词： STM图像模拟 金属酞菁 电子结构     

STM针尖诱导构筑-置换两步法制备Pt表面纳米结构

STM“Jump-to-contact”针尖诱导表面纳米构筑是目前水溶液中具有最高分辨率的一种表面纳米构筑技术.然而,一些金属因其具有较高的内聚能而难以发生针尖原子向表面的转移,限制了该技术的广泛应用.本文建立了以STM构筑-置换两步法获得不能直接利用“Jump-to-contact”原理进行构筑的金属表面纳米团簇阵列,利用STM针尖“Jump-to-contact”诱导在Au(111)表面构筑Cu纳米团簇阵列,然后通过Pt-Cu置换的方法,制备出Au(111)表面的Pt纳米团簇阵列.     

扫描隧道显微镜研究石墨表面的莫尔图

Moir patterns on HOPG were studied with scanning tunneling microscopy (STM). The results reveal that the observed Moiré patterms originate from the defects locating several layers below the surface ,which presents the first experimental evidence supporting the prediction that in HOPG the nanoscale electronic waves can propagate through several layers without obvious decay.     

相位可控的核四极矩共振激励脉冲发生器设计

在核四极矩共振（NQR）领域,射频激励脉冲信号的优劣对NQR响应信号有重要影响.针对常规方法中射频激励脉冲参数不可控的问题,本文基于32位闪存微型控制器STM32和直接数字频率合成（DDS）芯片AD9910设计了一种相位可控激励脉冲发生器.采用STM32控制AD9910产生波形参数（脉冲宽度、脉冲间隔、脉冲个数和共振频率等）可控的射频激励脉冲,利用LabVIEW软件平台设计脉冲参数设置界面,并建立计算机与微控制器通信,实现波形参数的精确优化控制.实验结果表明,该方法实现了相位可控的NQR激励脉冲序列,可为后续NQR信号检测提供有效激励源.     

On-Surface Driven Formal Michael Addition Produces m-Polyaniline Oligomers on Pt(111)

On-surface synthesis is emerging as a highly rational bottom-up methodology for the synthesis of molecular structures that are unattainable or complex to obtain by wet chemistry. Here, oligomers of meta-polyaniline, a known ferromagnetic polymer, were synthesized from para-aminophenol building-blocks via an unexpected and highly specific on-surface formal 1,4 Michael-type addition at the meta position, driven by the reduction of the aminophenol molecule. We rationalize this dehydrogenation and coupling reaction mechanism with a combination of in situ scanning tunneling and non-contact atomic force microscopies, high-resolution synchrotron-based X-ray photoemission spectroscopy and first-principles calculations. This study demonstrates the capability of surfaces to selectively modify local molecular conditions to redirect well-established synthetic routes, such as Michael coupling, towards the rational synthesis of new covalent nanostructures.     

Au(100) as a Template for Pentacene Monolayer

The surface of quasi-hexagonal reconstructed Au(100) is used as the template for monolayer pentacene (PEN) self-assembly. The system is characterized by means of scanning tunneling microscopy at room temperature and under an ultra-high vacuum. A new modulated pattern of molecules with long molecular axes (MA) arranged along hex stripes is found. The characteristic features of the hex reconstruction are preserved herein. The assembly with MA across the hex rows leads to an unmodulated structure, where the molecular layer does not recreate the buckled hex phase. The presence of the molecules partly lifts the reconstruction—i.e., the gold hex phase is transformed into a (1×1) phase. The arrangement of PEN on the gold (1×1) structure is the same as that of the surrounding molecular domain on the reconstructed surface. The apparent height difference between phases allows for the distinction of the state of the underlying gold surface.