APL Nameplate
  • Volume/Page
  • Keyword
  • DOI
  • Citation
  • Advanced
   
 
 
 

Flickr Twitter iResearch App Facebook

BROWSE VOLUMES

Year Range: 
Search Issue | RSS Feeds RSS
Previous Issue Next Issue

10 Sep 2012

Volume 101, Issue 11, Articles (11xxxx)

Issue Cover Spotlight Figure

Appl. Phys. Lett. 101, 113302 (2012); http://dx.doi.org/10.1063/1.4749791 (4 pages)

Chang-Hoon Shim, Shuzo Hirata, Juro Oshima, Tomohiko Edura, Reiji Hattori, and Chihaya Adachi
Enlarge Image | Read More
Return to All Sections
back to top
RSS Feeds

Growth of continuous and ultrathin platinum films on tungsten adhesion layers using atomic layer deposition techniques

L. Baker, A. S. Cavanagh, J. Yin, S. M. George, A. Kongkanand, and F. T. Wagner

Appl. Phys. Lett. 101, 111601 (2012); http://dx.doi.org/10.1063/1.4749819 (4 pages) | Cited 2 times

Online Publication Date: 11 September 2012

Full Text: Read Online (HTML) | Download PDF

Show Abstract
Continuous and ultrathin platinum (Pt) films were deposited on tungsten (W) adhesion layers using atomic layer deposition (ALD) techniques. Pt ALD films were deposited at 120 °C using MeCpPtMe3 and H2 plasma as the reactants. X-ray reflectivity studies observed the rapid nucleation of the Pt film. X-ray photoelectron results were consistent with layer-by-layer growth suggesting a continuous Pt film at thicknesses ≥1.5 nm. The high surface energy of the W ALD adhesion layer enables the growth of continuous and ultrathin films of lower surface energy metals and should facilitate the use of precious metals for a variety of applications.
Show PACS
68.55.at Other materials
81.15.Gh Chemical vapor deposition (including plasma-enhanced CVD, MOCVD, ALD, etc.)
65.40.gp Surface energy
79.60.Bm Clean metal, semiconductor, and insulator surfaces

Effect of the polarity of carbon-fluorine bonds on the work function of plasma-fluorinated epitaxial graphene

Sonam D. Sherpa, Galit Levitin, and Dennis W. Hess

Appl. Phys. Lett. 101, 111602 (2012); http://dx.doi.org/10.1063/1.4752443 (4 pages)

Online Publication Date: 12 September 2012

Full Text: Read Online (HTML) | Download PDF

Show Abstract
Work function engineering of graphene facilitates its application as a transparent electrode material in organic electronic devices. Toward this end, we demonstrate the dependence of the work function of plasma-fluorinated epitaxial graphene on the polarity of carbon-fluorine bonds which is controlled by the nature of chemical bonding (ionic, semi-ionic, or covalent) between fluorine and carbon atoms. The work function of fluorinated graphene was measured using ultraviolet photoelectron spectroscopy and the polarity of carbon-fluorine bonds was established using x-ray photoelectron spectroscopy.
Show PACS
73.30.+y Surface double layers, Schottky barriers, and work functions
78.67.Wj Optical properties of graphene
79.60.Bm Clean metal, semiconductor, and insulator surfaces
61.50.Lt Crystal binding; cohesive energy

Superhydrophobic surfaces cannot reduce ice adhesion

Jing Chen, Jie Liu, Min He, Kaiyong Li, Dapeng Cui, Qiaolan Zhang, Xiping Zeng, Yifan Zhang, Jianjun Wang, and Yanlin Song

Appl. Phys. Lett. 101, 111603 (2012); http://dx.doi.org/10.1063/1.4752436 (3 pages) | Cited 1 time

Online Publication Date: 13 September 2012

Full Text: Read Online (HTML) | Download PDF

Show Abstract
Understanding the mechanism of ice adhesion on surfaces is crucial for anti-icing surfaces, and it is not clear if superhydrophobic surfaces could reduce ice adhesion. Here, we investigate ice adhesion on model surfaces with different wettabilities. The results show that the superhydrophobic surface cannot reduce the ice adhesion, and the ice adhesion strength on the superhydrophilic surface and the superhydrophobic one is almost the same. This can be rationalized by the mechanical interlocking between the ice and the surface texture. Moreover, we find that the ice adhesion strength increases linearly with the area fraction of air in contact with liquid.
Show PACS
68.35.Np Adhesion
68.08.Bc Wetting

Modulation doping to control the high-density electron gas at a polar/non-polar oxide interface

Tyler A. Cain, Pouya Moetakef, Clayton A. Jackson, and Susanne Stemmer

Appl. Phys. Lett. 101, 111604 (2012); http://dx.doi.org/10.1063/1.4752439 (4 pages)

Online Publication Date: 13 September 2012

Full Text: Read Online (HTML) | Download PDF

Show Abstract
A modulation-doping approach to control the carrier density of the high-density electron gas at a prototype polar/non-polar oxide interface is presented. It is shown that the carrier density of the electron gas at a GdTiO3/SrTiO3 interface can be reduced by up to 20% from its maximum value (∼3 × 1014 cm−2) by alloying the GdTiO3 layer with Sr. The Seebeck coefficient of the two-dimensional electron gas increases concurrently with the decrease in its carrier density. The experimental results provide insight into the origin of charge carriers at oxide interfaces exhibiting a polar discontinuity.
Show PACS
73.40.Ns Metal-nonmetal contacts
72.20.Pa Thermoelectric and thermomagnetic effects

Droplet contact angle behavior on a hybrid surface with hydrophobic and hydrophilic properties

C. W. Yao, T. P. Garvin, J. L. Alvarado, A. M. Jacobi, B. G. Jones, and C. P. Marsh

Appl. Phys. Lett. 101, 111605 (2012); http://dx.doi.org/10.1063/1.4752470 (5 pages) | Cited 1 time

Online Publication Date: 13 September 2012

Full Text: Read Online (HTML) | Download PDF

Show Abstract
A hybrid surface consisting of an array of hydrophobic and hydrophilic sites was designed and fabricated in an effort to better understand the effects of microscale surface features and chemistry on wettability. A model based on energy minimization was developed to design and predict the wettability of hybrid surfaces. Measured advancing, receding, and equilibrium contact angles fit the proposed model well. Experiments show that a higher degree of hydrophobicity results in higher contact angles and that contact angle hysteresis increases with decreasing micropillar spacing (b/a). Moreover, measured roll-off angle as an indicator of droplet shedding, decreases with b/a.
Show PACS
68.03.Cd Surface tension and related phenomena
82.65.+r Surface and interface chemistry; heterogeneous catalysis at surfaces

Experimental surface-enhanced Raman scattering response of two-dimensional finite arrays of gold nanopatches

M. Grande, G. V. Bianco, M. A. Vincenti, T. Stomeo, D. de Ceglia, M. De Vittorio, V. Petruzzelli, M. Scalora, G. Bruno, and A. D'Orazio

Appl. Phys. Lett. 101, 111606 (2012); http://dx.doi.org/10.1063/1.4752719 (4 pages) | Cited 4 times

Online Publication Date: 14 September 2012

Full Text: Read Online (HTML) | Download PDF

Show Abstract
We experimentally investigate the nonlinear response of two-dimensional periodic arrays composed of gold nanopatches on silicon substrate, functionalized by means of a conjugated rigid thiol. The surface-enhanced Raman scattering (SERS) response is empirically evaluated using a laser source operating in the visible spectral range at λ = 633 nm. Nonlinear results are then correlated to optical and structural properties of the samples under investigation. SERS mapping and estimation of the SERS enhancement factor are examined to determine stability and reproducibility of the results, highlighting also the contribution of the plasmonic resonance excited in the two-dimensional periodic array, and the dependence on the numerical aperture of the microscope objective used in the micro-Raman system.
Show PACS
78.30.Er Solid metals and alloys
61.46.-w Structure of nanoscale materials
73.20.Mf Collective excitations (including excitons, polarons, plasmons and other charge-density excitations)
78.40.Kc Metals, semimetals, and alloys
78.66.Bz Metals and metallic alloys

A photoelectron spectroscopy study of the electronic structure evolution in CuInSe2-related compounds at changing copper content

T. V. Kuznetsova, V. I. Grebennikov, H. Zhao, C. Derks, C. Taubitz, M. Neumann, C. Persson, M. V. Kuznetsov, I. V. Bodnar, R. W. Martin, and M. V. Yakushev

Appl. Phys. Lett. 101, 111607 (2012); http://dx.doi.org/10.1063/1.4752723 (4 pages)

Online Publication Date: 14 September 2012

Full Text: Read Online (HTML) | Download PDF

Show Abstract
Evolution of the valence-band structure at gradually increasing copper content has been analysed by x-ray photoelectron spectroscopy (XPS) in In2Se3, CuIn5Se8, CuIn3Se5, and CuInSe2 single crystals. A comparison of these spectra with calculated total and angular-momentum resolved density-of-states (DOS) revealed the main trends of this evolution. The formation of the theoretically predicted gap between the bonding and non-bonding states has been observed in both experimental XPS spectra and theoretical DOS.
Show PACS
79.60.Bm Clean metal, semiconductor, and insulator surfaces
73.20.At Surface states, band structure, electron density of states
71.20.Nr Semiconductor compounds
82.80.Pv Electron spectroscopy (X-ray photoelectron (XPS), Auger electron spectroscopy (AES), etc.)

Scanning internal photoemission microscopy for the identification of hot carrier transport mechanisms

D. Differt, W. Pfeiffer, and D. Diesing

Appl. Phys. Lett. 101, 111608 (2012); http://dx.doi.org/10.1063/1.4752734 (4 pages)

Online Publication Date: 14 September 2012

Full Text: Read Online (HTML) | Download PDF

Show Abstract
Linear and nonlinear internal photoemission in a thin-film metal-insulator-metal heterosystem, i.e., a Ta-TaOx-Ag junction, together with surface reflectivity are mapped with a lateral resolution of better than 5 μm. The spatial correlation of the different signals and time-resolved internal photoemission spectroscopy reveal excitation mechanisms and ballistic hot carrier injection. The internal photoemission yield variation with Ag layer thickness is quantitatively explained by above-barrier injection. The hot-spot-like behavior of the two-photon induced internal photoemission observed for short pulse excitation is attributed to local field enhancements because of Ag-film thickness reduction and plasmonic effects at structural defects.
Show PACS
73.40.Rw Metal-insulator-metal structures
78.47.D- Time resolved spectroscopy (>1 psec)
79.60.Jv Interfaces; heterostructures; nanostructures
73.23.Ad Ballistic transport
72.30.+q High-frequency effects; plasma effects
72.20.Ht High-field and nonlinear effects

Analysis of surface plasmon excitation at terahertz frequencies with highly doped graphene sheets via attenuated total reflection

Choon How Gan

Appl. Phys. Lett. 101, 111609 (2012); http://dx.doi.org/10.1063/1.4752465 (4 pages)

Online Publication Date: 14 September 2012

Full Text: Read Online (HTML) | Download PDF

Show Abstract
Excitation of surface plasmons supported by doped graphene sheets at terahertz frequencies is investigated numerically. To alleviate the momentum mismatch between the highly confined plasmon modes and the incident radiation, it is proposed to increase the surface conductivity of graphene through high doping levels or with few-layer graphene. For currently achievable doping levels, our analysis shows that surface plasmons on monolayer graphene may be excited at operating frequencies up to about 10 THz ( ∼ 41.3 meV) with a high-index coupling prism, and higher frequencies/energies are possible for few-layer graphene. These highly confined surface modes are promising for sensing and waveguiding applications in the terahertz regime.
Show PACS
73.22.Lp Collective excitations
73.20.Mf Collective excitations (including excitons, polarons, plasmons and other charge-density excitations)
78.68.+m Optical properties of surfaces
78.70.Gq Microwave and radio-frequency interactions
61.72.up Other materials
73.25.+i Surface conductivity and carrier phenomena
Return to All Sections
Close

Google Calendar

ADVERTISEMENT

Go to AIP Home   © AIP Publishing LLC
close