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Nanoparticles and nanowires: synchrotron spectroscopy studies
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TLDR
In this paper, a review of the research in nanomaterials conducted in our laboratory in the last decade using conventional and synchrotron radiation techniques is presented, where the focus is placed on the analysis of nano-materials using synchoretron radiation.Abstract:
This paper reviews the research in nanomaterials conducted in our laboratory in the last decade using conventional and synchrotron radiation techniques. While preparative and conventional characterisation techniques are described, emphasis is placed on the analysis of nanomaterials using synchrotron radiation. Materials of primary interests are metal nanoparticles and semiconductor nanowires and naonribbons. Synchrotron techniques based on absorption spectroscopy such as X-ray absorption fine structures (XAFS), which includes X-ray absorption near edge structures (XANES) and extended X-ray absorption fine structures (EXFAS), and de-excitation spectroscopy, including X-ray excited optical luminescence (XEOL), time-resolved X-ray excited optical luminescence (TRXEOL) and X-ray emission spectroscopy (XES) are described. We show that the tunability, brightness, polarisation and time structure of synchrotron radiation are providing unprecedented capabilities for nanomaterials analysis. Synchrotron studies of prototype systems such as gold nanoparticles, 1-D nanowires of group IV materials, C, Si and Ge as well as nanodiamond, and compound semiconductors, ZnS, CdS, ZnO and related materials are used to illustrate the power and unique capabilities of synchrotron spectroscopy in the characterisation of local structure, electronic structure and optical properties of nanomaterials.read more
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Journal ArticleDOI
Semiconductor quantum dots and quantum dot arrays and applications of multiple exciton generation to third-generation photovoltaic solar cells.
Arthur J. Nozik,Matthew C. Beard,Joseph M. Luther,Matt Law,Randy J. Ellingson,Justin C. Johnson +5 more
TL;DR: The general principles of QD synthesis are summarized using InP as an example and applications of QDs and QD arrays in novel quantum dot PV cells, where multiple exciton generation from single photons could yield significantly higher PV conversion efficiencies are discussed.
Journal ArticleDOI
Nitrogen doping effects on the structure of graphene
Dongsheng Geng,Songlan Yang,Yong Zhang,Jinli Yang,Jian Liu,Ruying Li,Tsun-Kong Sham,Xueliang Sun,Siyu Ye,Shanna Knights +9 more
TL;DR: In this article, the effect of nitrogen doping on the structure of graphene has been systematically investigated by various characterization techniques such as SEM, TEM, BET, Raman and XRD analysis were used to distinguish the difference of the microstructures; and FT-IR, XPS, especially XANES were performed to elucidate the bonding information such as C-N.
Journal ArticleDOI
Hierarchical nanostructured core-shell Sn@C nanoparticles embedded in graphene nanosheets: spectroscopic view and their application in lithium ion batteries.
Dongniu Wang,Xifei Li,Jinli Yang,Jiajun Wang,Dongsheng Geng,Ruying Li,Mei Cai,Tsun-Kong Sham,Xueliang Sun +8 more
TL;DR: Synchrotron spectroscopy confirms that the metallic tin core is free of oxidation and the existence of charge redistribution transfer from tin to the carbonaceous materials of the shell, facilitating their intimate contact by chemical bonding and resultant lattice variation.
Journal ArticleDOI
Origin of the bright photoluminescence of few-atom silver clusters confined in LTA zeolites
Didier Grandjean,Eduardo Coutino-Gonzalez,Ngo Tuan Cuong,Ngo Tuan Cuong,Eduard Fron,Wouter Baekelant,Saleh Aghakhani,Philomena Schlexer,Francesco d'Acapito,Dipanjan Banerjee,Maarten B. J. Roeffaers,Minh Tho Nguyen,Johan Hofkens,Peter Lievens +13 more
TL;DR: The bright green luminescence of Ag clusters confined in partially exchanged Ag–Linde Type A (LTA) zeolites is characterized by means of a combination of x-ray excited optical Luminescence-extended x-Ray absorption fine structure, time-dependent–density functional theory calculations, and time-resolved spectroscopy.
Journal ArticleDOI
Soft X-ray XANES studies of various phases related to LiFePO4 based cathode materials
Songlan Yang,Dongniu Wang,Guoxian Liang,Yun Miu Yiu,Jiajun Wang,Lijia Liu,Xueliang Sun,Tsun-Kong Sham +7 more
TL;DR: In this paper, a series of synchrotron-based X-ray absorption near-edge structure (XANES) spectroscopy studies for the element speciation in various impurity phase materials relevant to LiFePO4 for Li ion batteries was conducted.
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Journal ArticleDOI
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