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  • AIP Publishing  (22)
  • Chen, Wei  (22)
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  • AIP Publishing  (22)
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  • 1
    Online Resource
    Online Resource
    Surface transfer hole doping of epitaxial graphene using MoO3 thin film
    AIP Publishing ; 2010
    In:  Applied Physics Letters Vol. 96, No. 21 ( 2010-05-24)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 96, No. 21 ( 2010-05-24)
    Abstract: Synchrotron-based in situ photoelectron spectroscopy investigations demonstrate effective surface transfer p-type doping of epitaxial graphene (EG) thermally grown on 4H–SiC(0001) via the deposition of MoO3 thin film on top. The large work function difference between EG and MoO3 facilitates electron transfer from EG to the MoO3 thin film. This leads to hole accumulation in the EG layer with an areal hole density of about 1.0×1013 cm−2, and places the Fermi level 0.38 eV below the graphene Dirac point.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/1.3441263
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2010
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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  • 2
    Online Resource
    Online Resource
    Molecular orientation of 3, 4, 9, 10-perylene-tetracarboxylic-dianhydride thin films at organic heterojunction interfaces
    AIP Publishing ; 2007
    In:  Applied Physics Letters Vol. 91, No. 11 ( 2007-09-10)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 91, No. 11 ( 2007-09-10)
    Abstract: In situ low-temperature scanning tunneling microscopy and near-edge x-ray absorption spectroscopy measurements have been used to investigate the molecular orientation of 3,4,9,10-perylene-tetracarboxylic-dianhydride (PTCDA) thin films at the interface of organic heterojunctions of PTCDA on copper(II) phthalocyanine (CuPc). On the CuPc monolayer on highly oriented pyrolitic graphite, PTCDA molecules form a well-ordered in-plane herringbone structure with their molecular plane parallel to the substrate surface. The formation of multiple in-plane hydrogen bonding between neighboring PTCDA molecules is responsible for the flat-lying PTCDA on CuPc monolayer, and gives rise to the lying-down orientation of PTCDA thin films on both standing-up and lying-down CuPc thin films, as well as on Au(111) passivated by a self-assembled monolayer of octane-1-thiol.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/1.2785948
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2007
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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  • 3
    Online Resource
    Online Resource
    Two-dimensional modeling image of space charge migration in a needle-like electron beam plasma
    AIP Publishing ; 2019
    In:  Physics of Plasmas Vol. 26, No. 2 ( 2019-02-01)
    Details
    In: Physics of Plasmas, AIP Publishing, Vol. 26, No. 2 ( 2019-02-01)
    Abstract: Charge neutralization in a continuous electron beam plasma (EBP) in a half-open space at intermediate and high pressures is an important physical issue. A two-dimensional numerical simulation was performed to illustrate the spatial and temporary evolution of the needle-like EBP from the beginning of electron beam injection to the quasi-steady state. The temporary evolution of the space charge separates into three phases and the involved respective physical processes controlling different phases were identified. The first phase lasts for less than 1 ns, where the space charge comprising the beam electrons is mainly near the exiting entrance. In the second phase, a significant ring-shaped distribution of space charge appears because of broad differences in the energy and charge distributions. Moreover, the space potential first increases and then decreases, a result of competition between the charge accumulation by the injection of beam electrons and the charge migration of plasma electrons. The second phase lasts from 1 ns to about 3 μs. In the third phase, the EBP reaches quasi-equilibrium, where the spatial potential is a result of ambipolar diffusion and is therefore only correlated with the distribution of plasma electrons. As a result, the spatial and temporary evolution of the continuous EBP is governed by energy and charge deposition, whereas the parameter values in the quasi-steady state are mainly determined by the energy deposition.
    Type of Medium: Online Resource
    ISSN: 1070-664X , 1089-7674
    URL: Article
    DOI: 10.1063/1.5085038
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2019
    detail.hit.zdb_id: 1472746-8
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  • 4
    Online Resource
    Online Resource
    Scaling relations for a needle-like electron beam plasma from the self-similar behavior in beam propagation
    AIP Publishing ; 2017
    In:  Physics of Plasmas Vol. 24, No. 10 ( 2017-10-01)
    Details
    In: Physics of Plasmas, AIP Publishing, Vol. 24, No. 10 ( 2017-10-01)
    Abstract: Scaling relations of the main parameters of a needle-like electron beam plasma (EBP) to the initial beam energy, beam current, and discharge pressures are presented. The relations characterize the main features of the plasma in three parameter space and can provide great convenience in plasma design with electron beams. First, starting from the self-similar behavior of electron beam propagation, energy and charge depositions in beam propagation were expressed analytically as functions of the three parameters. Second, according to the complete coupled theoretical model of an EBP and appropriate assumptions, independent equations controlling the density and space charges were derived. Analytical expressions for the density and charges versus functions of energy and charge depositions were obtained. Finally, with the combination of the expressions derived in the above two steps, scaling relations of the density and potential to the three parameters were constructed. Meanwhile, numerical simulations were used to test part of the scaling relations.
    Type of Medium: Online Resource
    ISSN: 1070-664X , 1089-7674
    URL: Article
    DOI: 10.1063/1.4998260
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2017
    detail.hit.zdb_id: 1472746-8
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  • 5
    Online Resource
    Online Resource
    “Zigzag” C60 chain arrays
    AIP Publishing ; 2008
    In:  Applied Physics Letters Vol. 92, No. 2 ( 2008-01-14)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 92, No. 2 ( 2008-01-14)
    Abstract: We present a low-temperature scanning tunneling microscopy investigation revealing the formation of a long range ordered α-sexithiophene (6T) monolayer nanostripe array on highly ordered pyrolytic graphite, with thiophene ring units oriented parallel to the surface. The 6T monolayer nanostripe is an effective molecular nanotemplate for the assembly of an ordered “zigzag” C60 chain array, accompanied by a slight structural modification of the underlying 6T nanostripes due to donor-acceptor intermolecular interactions between 6T and C60 molecules.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/1.2831902
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2008
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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  • 6
    Online Resource
    Online Resource
    Scattering pulse of label free fine structure cells to determine the size scale of scattering structures
    AIP Publishing ; 2016
    In:  Review of Scientific Instruments Vol. 87, No. 4 ( 2016-04-01)
    Details
    In: Review of Scientific Instruments, AIP Publishing, Vol. 87, No. 4 ( 2016-04-01)
    Abstract: Scattering pulse is sensitive to the morphology and components of each single label-free cell. The most direct detection result, label free cell’s scattering pulse is studied in this paper as a novel trait to recognize large malignant cells from small normal cells. A set of intrinsic scattering pulse calculation method is figured out, which combines both hydraulic focusing theory and small particle’s scattering principle. Based on the scattering detection angle ranges of widely used flow cytometry, the scattering pulses formed by cell scattering energy in forward scattering angle 2°–5° and side scattering angle 80°-110° are discussed. Combining the analysis of cell’s illuminating light energy, the peak, area, and full width at half maximum (FWHM) of label free cells’ scattering pulses for fine structure cells with diameter 1–20 μm are studied to extract the interrelations of scattering pulse’s features and cell’s morphology. The theoretical and experimental results show that cell’s diameter and FWHM of its scattering pulse agree with approximate linear distribution; the peak and area of scattering pulse do not always increase with cell’s diameter becoming larger, but when cell’s diameter is less than about 16 μm the monotone increasing relation of scattering pulse peak or area with cell’s diameter can be obtained. This relationship between the features of scattering pulse and cell’s size is potentially a useful but very simple criterion to distinguishing malignant and normal cells by their sizes and morphologies in label free cells clinical examinations.
    Type of Medium: Online Resource
    ISSN: 0034-6748 , 1089-7623
    URL: Article
    DOI: 10.1063/1.4946781
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2016
    detail.hit.zdb_id: 209865-9
    detail.hit.zdb_id: 1472905-2
    SSG: 11
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    Online Resource
  • 7
    Online Resource
    Online Resource
    Self-assembled organic donor/acceptor nanojunction arrays
    AIP Publishing ; 2008
    In:  Applied Physics Letters Vol. 92, No. 19 ( 2008-05-12)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 92, No. 19 ( 2008-05-12)
    Abstract: We have fabricated well-ordered organic donor/acceptor nanojunction arrays comprising p-sexiphenyl (6P) and C60 via self-assembly of C60 on the molecular nanotemplate of 6P nanostripes on Ag(111). Our scanning tunneling microscopy measurements show that the preferential trapping of C60 triplets atop 6P single molecule leads to the formation of the C60∕6P vertical nanojunctions with well-defined two-dimensional arrangement. Annealing this binary molecular superstructure at 380K results in the insertion of C60 linear chains between the neighboring 6P nanostripes and thereby the appearance of the periodic C60∕6P lateral nanojunction arrays.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/1.2920199
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2008
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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  • 8
    Online Resource
    Online Resource
    Chemical vapor deposition graphene as structural template to control interfacial molecular orientation of chloroaluminium phthalocyanine
    AIP Publishing ; 2011
    In:  Applied Physics Letters Vol. 99, No. 9 ( 2011-08-29)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 99, No. 9 ( 2011-08-29)
    Abstract: Chemical vapor deposition (CVD) graphene has been used as an effective structural template to manipulate molecular orientation of organic thin film of chloroaluminium phthalocyanine (ClAlPc) on indium tin oxide (ITO) electrode. As revealed by in-situ near-edge x-ray adsorption fine structure measurement, ClAlPc molecules on the CVD graphene modified ITO electrode adopt a well-aligned lying-down configuration with their molecular π-plane nearly parallel to the electrode surface, in contrast to the random orientation of ClAlPc molecules on the bare ITO electrode. This lying-down configuration results in an optimized stacking of the molecular π-plane perpendicular to the electrode surface and hence facilitates efficient charge transport along this direction.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/1.3629812
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2011
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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  • 9
    Online Resource
    Online Resource
    Scanning tunneling microscopy and photoelectron spectroscopy investigation of the sexithiophene:C 60 donor-acceptor nanostructure formation on graphite
    AIP Publishing ; 2011
    In:  Journal of Applied Physics Vol. 109, No. 8 ( 2011-04-15), p. 084307-
    Details
    In: Journal of Applied Physics, AIP Publishing, Vol. 109, No. 8 ( 2011-04-15), p. 084307-
    Type of Medium: Online Resource
    ISSN: 0021-8979 , 1089-7550
    URL: Article
    DOI: 10.1063/1.3573779
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2011
    detail.hit.zdb_id: 220641-9
    detail.hit.zdb_id: 3112-4
    detail.hit.zdb_id: 1476463-5
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  • 10
    Online Resource
    Online Resource
    Deoxidation of graphene oxide nanosheets to extended graphenites by “unzipping” elimination
    AIP Publishing ; 2008
    In:  The Journal of Chemical Physics Vol. 129, No. 11 ( 2008-09-21)
    Details
    In: The Journal of Chemical Physics, AIP Publishing, Vol. 129, No. 11 ( 2008-09-21)
    Abstract: Low-temperature scanning tunneling microscopy on alkyl-surface-functionalized graphene oxide nanosheets reveals the formation of low-dimensional graphenite nanostructures with extended π-conjugation at deoxidation temperatures above 150°C. The elimination of these alkyl chains from the surface of the nanosheets does not occur uniformly, but in distinctive patterns that correspond to the formation of an underlying network of graphenite one-dimensional “tracks” and “dots.” Atomic-resolution imaging of these graphenite regions reveals a defective honeycomb lattice characteristic of single-layer graphenes. These extended graphenite structures percolate the nanosheet even for moderate levels of deoxidation and regraphenization of the basal plane. The formation of extended conjugation indicates a regioselective rather than random elimination of the oxygen atoms and alkyl chains. The resultant network morphology allows bandlike transport of charge carriers across the sheets despite defects and disorder. The sub-meV apparent activation energies for the field-effect mobilities at low temperatures (70–30K) for both electrons and holes rule out significant electron-phonon coupling. This suggests a remarkable potential for electronic applications of these solution-processable functionalized graphene oxide nanosheets.
    Type of Medium: Online Resource
    ISSN: 0021-9606 , 1089-7690
    URL: Article
    DOI: 10.1063/1.2975330
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2008
    detail.hit.zdb_id: 3113-6
    detail.hit.zdb_id: 1473050-9
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