本文利用原子级扫描透射电子显微术(scanning transmission electron microscopy,STEM)研究了PtS_(2)在连续Ar等离子体作用下其表面S原子不断缺失并导致相转变的过程。实验发现随着S原子占比的减小,层状1T相PtS_(2)以逐层非晶化的方式...本文利用原子级扫描透射电子显微术(scanning transmission electron microscopy,STEM)研究了PtS_(2)在连续Ar等离子体作用下其表面S原子不断缺失并导致相转变的过程。实验发现随着S原子占比的减小,层状1T相PtS_(2)以逐层非晶化的方式转变为无定形非晶相PtS_(x)(x<2),并且基于径向分布函数(radial distribution function,RDF)分析定量提取了最邻近Pt-Pt、Pt-S、S-S原子对的分布概率。随着S原子占比的继续减小,表面非晶相PtSx最终转变为单晶Pt,结合电子能量损失谱(electron energy loss spectroscopy,EELS)与STEM原子序数衬度图像分析表明,Pt原子以(111)面心立方密堆的方式堆垛,形成少层甚至单层Pt晶畴。展开更多
The photovoltaic features and photo-induced interfacial charge transfer of CuPc-modified Q-CdS films were investigated by surface photovoltage spectra and optical absorption spectra. The results show that the interfac...The photovoltaic features and photo-induced interfacial charge transfer of CuPc-modified Q-CdS films were investigated by surface photovoltage spectra and optical absorption spectra. The results show that the interfacial chaxge transfer and photosensitization between cuPc and Q-cds occur under inuAnnation. Based on the observations,the generation and processes of the charge transfer are proposed and discussed.展开更多
Nickel-palladium film on p-Si prepared by potential -controlled electrodeposition has much better adherence than that deposited by other methods .To reveal the reasons of this effect ,X-ray photoelectron spectroscopy ...Nickel-palladium film on p-Si prepared by potential -controlled electrodeposition has much better adherence than that deposited by other methods .To reveal the reasons of this effect ,X-ray photoelectron spectroscopy (XPS) combmed with Ar+sput tering was used to investigate the interface of NiPd /Si .The results showed that dramatic interdiffusion of Ni, Pd and Si had occurred at atmospheric temperature .On the XPS spectra of mckel and palladium ,there are two kinds of binding energy ,contributed by pure metals and metal silicide respectively. NiSi, PdSi and Pd2Si were formed at the interface. Both of the electric field on the surface and the H atoms in the metal lattice have the possibility to promote reactions between nickel or palladium and silicon .展开更多
文摘本文利用原子级扫描透射电子显微术(scanning transmission electron microscopy,STEM)研究了PtS_(2)在连续Ar等离子体作用下其表面S原子不断缺失并导致相转变的过程。实验发现随着S原子占比的减小,层状1T相PtS_(2)以逐层非晶化的方式转变为无定形非晶相PtS_(x)(x<2),并且基于径向分布函数(radial distribution function,RDF)分析定量提取了最邻近Pt-Pt、Pt-S、S-S原子对的分布概率。随着S原子占比的继续减小,表面非晶相PtSx最终转变为单晶Pt,结合电子能量损失谱(electron energy loss spectroscopy,EELS)与STEM原子序数衬度图像分析表明,Pt原子以(111)面心立方密堆的方式堆垛,形成少层甚至单层Pt晶畴。
文摘The photovoltaic features and photo-induced interfacial charge transfer of CuPc-modified Q-CdS films were investigated by surface photovoltage spectra and optical absorption spectra. The results show that the interfacial chaxge transfer and photosensitization between cuPc and Q-cds occur under inuAnnation. Based on the observations,the generation and processes of the charge transfer are proposed and discussed.
文摘Nickel-palladium film on p-Si prepared by potential -controlled electrodeposition has much better adherence than that deposited by other methods .To reveal the reasons of this effect ,X-ray photoelectron spectroscopy (XPS) combmed with Ar+sput tering was used to investigate the interface of NiPd /Si .The results showed that dramatic interdiffusion of Ni, Pd and Si had occurred at atmospheric temperature .On the XPS spectra of mckel and palladium ,there are two kinds of binding energy ,contributed by pure metals and metal silicide respectively. NiSi, PdSi and Pd2Si were formed at the interface. Both of the electric field on the surface and the H atoms in the metal lattice have the possibility to promote reactions between nickel or palladium and silicon .
